3 depict such a positive relationship. The relative humidity more than 80% always creates discomfort due to the characteristics of deliquescent of the salt in the surface of the skin [14], and100% humidity leads to muggy conditions. Predicting mean sky transmittance of clear days (KC) The solar radiation that reaches the earth's surface on a clear day is a function of the solar constant, of the sine of the solar elevation, the relative air … Furthermore, this thesis reveals strong correlations between SSR and DTR in Europe In winter especially in January, February, November, and December, the sunshine hour was higher but the earth received the least solar radiation due to an oblique incident of the sunlight and optically thick low cloud [28]; as a result, the temperature was also low. The variation of solar radiation during 24 hours in the clear sky day always followed the Gaussian fit [21] in which adjusted value was 0.9899. Air temperature and dew point had the highest value from June to September nearly at 29°C and 25°C, respectively. The data used to support the findings of this study are available from the corresponding author upon request. Solar radiation is one of the important parameters to study climate change, environmental pollution, crop production, food industry, and hydrology [2]. The dew point temperature shows somewhat complex behavior. When the air temperature varied from 10 to 26°C, the dew point changed from 8 to 12°C. To predict the values of temperature and instant solar radiation when equipment are not readily available from obtained equations, a good knowledge and understanding of the disposition and distribution of solar radiation is a requirement for modelling earth’s weather and climate change variables. It is influenced by the location latitude, elevation, and proximity to water bodies. The research conducted by Regmi and Adhikary [26] and Poudyal et al. As variation of solar radiation is the single most important factor affecting climate, it is considered here first. Review articles are excluded from this waiver policy. [27] also reported the similar pattern of monthly variation of solar radiation in Kathmandu and Pokhara valley as we observed in Damak. 0427. Both observed and online calculated value are highly correlated with each other. It is due to the fact that during that period, day time temperature is normal but night time temperature is extremely low; as a result, these months represent the extreme climatic condition. This law (expressed mathematically as E = σT4) states that all objects with temperatures above absolute zero (0K or -273°C or -459°F) emit radiation at a rate proportional to the fourth power of their absolute temperature. Again, the time required for air temperature rising from the lowest temperature to the highest temperature is around 8 hours, but the time required for air temperature going down from the highest to the lowest is more than 15 hours. Even for the design of a solar energy conversion system, it requires precise knowledge of the availability of global solar radiation at the location of interest [3–5]. experimentally and Boltzmann theoretically developed a relationship between the temperature of a body and the amount of power it radiates. Sign up here as a reviewer to help fast-track new submissions. Solar radiation, ground surface and air temperatures change periodically day by day. Air temperature and relative humidity are two different climatic parameters in which RH is greatly affected by the air temperature. Consequently, it can be inferred that the trends in DTR were influenced by changes in emissions and the associated changes in incoming solar radiation. [22] rather than Gaussian fit (adj. The change of the slope in the different seasons points to a not completely linear relationship between DTR and SSR (Figures 2b–2e). 3.2. A more commonly available measure, which may provide such information, is the diurnal temperature range (DTR). From the statistical point of view, it is concluded that in a clear and sunny day, the variation of solar radiation and relative humidity follows the Gaussian distribution but the air temperature variation is governed by a sine function. Tests on three data sets indicate that 70–90% of the variation in daily solar radiation can be accounted for by this simple model. In order to collect data from the weather station, we use the instrument Data Shuttle which is a pocket-sized device that can be used to download and transport the data from the weather station to a computer, allowing the instrument to stay in place for continuous monitoring/recording. Just after the sunrise and just before the sunset, the air temperature is rising and dropping the fastest. The monthly variation pattern of solar radiation, air temperature, and dew point demonstrates that they have the highest value at summer and lowest in winter. It also measures the thermal discomfort of the individuals [12]. 1. Solar radiation is the ultimate source of energy for the planet. The relative sensor measures variance in the capacitance change of a one micron thick dielectric polymer layer. The difference between the maximum and minimum air temperatures is related to the degree of cloud cover in a location and hence can be used as the indicator of the fraction of extraterrestrial radiation that reaches the earth’s surface. The relationship is Tt = A[1—exp(—BΔTc)] where Tt is the daily total atmospheric transmittance, ΔT is the daily range of air temperature, and A, B, and C are empirical coefficients, determined for a particular location from measured solar radiation data. We tested for additive interactions between solar radiation and air temperature, age, and gender. So, increase in solar radiation increases the air temperature. SP6557. Available literatures show that few and limited studies have been conducted in eastern Nepal. relationship between solar radiation and temperature in Perlis, Northern Malaysia for the year of 2006. Potential causes for this nonlinearity may be changing hydrological conditions during the different seasons and the nonlinear relationship between radiation and temperature (i.e., the Stefan‐Boltzmann law). Climate - Climate - Average relative humidity: The average relative humidity for July reveals the humidity provinces of the Northern Hemisphere when aridity is at a maximum. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. April and May represent the premonsoon period. Dew point greater than 60°C at lower atmosphere gives the probability of intense thunderstorms [17]. Benestad's 2005 review found that the solar cycle did not follow Earth's global mean surface temperature. The variation of average monthly dew point is exhibited in Figure 4(d). However, on the day and nighttime, its value was relatively high. 1. of the observed and online calculated value of dew point tells us that 99.8% data gives the exact fit of a linear relationship. where , , and . The relationship between mean daily wind speed and the daily thermal range at that station is reported in Fig. Germplasm col-lected from the U.S. Monthly variation of solar radiation, air temperature, RH, and dew point in 2013. In such a situation, solar radiation could be derived from air temperature. Then we measured the surface temperature, air temperature, humidity and wind velocity on various types of land covers such as concrete, asphalt, soil and grass every hour for one cycle namely 24 hours. Sometimes, RH is also affected by the other climatic phenomenon like rainfall, wind flow, and cloudy day [24], and their overall effect on the RH can be observed in Figure 4(c). and give the relevancy of the measured data. To achieve this, the data are presented in daily averaged maximum and minimum air temperature, and daily averaged solar radiation. There are numerous factors such as dew point temperature, ambient temperature, and solar radiation that can combine to influence relative humidity [13]. Monitoring and prediction of the climatic phenomenon are of keen interest in recent years because it has great influence in the lives of people and their environments. Project No. The instantaneous intensity of global solar radiation, air temperature, relative humidity, and dew point measured on 09 February 2013 has been depicted in Figure 3. Damak is situated between 26°3521.28N to 26°4458.71N latitude and 87°399.40E to 8704310.32E longitude in the southeastern Terai region of Nepal with 130 m in elevation from sea level. The diurnal and nocturnal temperature of each month showed that temperature difference was relatively lower (less than 10°C) at summer rather than in winter. To determine outgoing radiation power , we utilize the Stefan-Boltzmann Law: P A T=εσ4 (1) Where P (watts) is the radiated power from a body of area A (m2) at temperature T (K). The main exposure variable was average solar radiation at residence during the past 15 years. Hence, it is also clear that dew point is significantly correlated with solar radiation. However, studies of temperature and other parameters at more local scales are also needed to be given the fact that broad-scale analyses may mask considerable spatial and temporal variation in climatic trends [18]. To predict the values of temperature and instant solar radiation when equipment are not readily available from obtained equations, a good knowledge and understanding of the disposition and distribution of solar radiation is a requirement for modelling earth’s weather and climate change variables. It was found that the linear correlation coefficient value is 0.7473 shows that a strong linear relationship between solar radiation and surface temperature. It is due to the fact that air temperature is directly related to the global solar radiation. The monthly observed value of RH obtained from the weather station and the online calculation is demonstrated in Figure 5. Dew point increased from the lowest value at the month of January and attained the highest value during the month of June, July, August, and September. College of Agriculture Research Center, Washington State University, Pullman, WA. The variation of the air temperature and solar radiation is displayed in Figures 4(a) and 4(b). It was primarily caused by least sunshine hour, high precipitation, and cloud [29]. 18 Usually, there are three different approaches to estimate the sky temperature: empirical methods, radiation charts, and computer program models. All these sensors were manufactured by Virtual Electronics Company, India. The scatter plots shown in Fig. ), and it is shown by the fitted curve of red color. The variation of dew point followed the same pattern as that of air temperature and changed from 10°C to 25°C. However, afternoon, air temperature gradually decreased all night and indeed occurred the least value during the early morning. Again, the increasing or decreasing trend of solar radiation is almost symmetrical on a sunny day. It was found that the linear correlation coefficient value is 0.7473 shows that a strong linear relationship between solar radiation and surface temperature. Observed and online calculated value of dew point. The authors declare that they have no conflicts of interest. However, the change in air temperature satisfies the sine function. From the statistical point of view, we can say that the quality of the measured data is relevant. During that period, the earth received lesser solar radiation as compared to the premonsoon period. A relationship between atmospheric transmittance and the daily range of air temperature is developed. 3.2. At other times the relative humidity generally will be higher. The data of the Kathmandu valley represents the whole part of Nepal because it is situated in the middle part of Nepal. The highest sunshine hour, clear and sunny day, made the earth surface to receive the maximum solar radiation during premonsoon. Correlation matrix of climatic parameters. Dew point temperature is preferred by meteorologists over relative humidity as an indicator of human comfort [15] and also used in forecasting the rain, frost, and fog formation as well as the probability of thunderstorms [16]. Correlation matrix shows that the dew point is significantly correlated with air temperature rather than relative humidity. During the morning (without solar radiation), the difference between the surface paints and the support glass was ~ 1 °C, but the solar radiation increased this difference in ~ 3 °C, in addition to the increase of 10 °C produced by the impact of the solar radiation on the glass support (“Impact of the solar radiation” section). June, July, August, and September represent the monsoon period in Nepal. As ranges from 0 to 1, the effective sky temperature is lower than the surface level air temperature. On a clear and sunny day, diurnal variation of solar radiation exhibited a noon maximum, decreased with the decrease of solar altitude and became least (zero) in the morning and evening. Temperature is a measure of the thermal state of matter and represents the degree of hotness or coldness of a body. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. On the relationship between incoming solar radiation and daily maximum and minimum temperature. Theoretical consideration of the energy budget equation suggests that the relationship between solar radiation and air temperature is dependent upon five major factors, i. e. the reflection coefficient, effective outgoing longwave radiation, the Bowen ratio, heat flux into the soil, and advection. Daily variation of solar radiation, air temperature, RH, and dew point on the 9th of Feb. 2013. The lowest value of the relative humidity (55.4%) in April indicates the driest month of the year. We are committed to sharing findings related to COVID-19 as quickly as possible. 1) Relationship between photoperiod, temperature, solar radiation and grain yield in soybean Photoperiod and temperature influence the growth, development and area of adaptation of soybean cultivars (Shanmugasundaram, 1981). Location of the study area in the map of Nepal. It had +1 repeatability, cosine response at 750 zenith angle +10%, and cosine response at 450 zenith angle +4% whose sensitivity was custom calibrated to exactly 5.00 Wm-2/mu and operating environment of -40 to 55°C and 0 to 100% RH. Scientific paper No. If temperature increases, the relative humidity decreases, and vice versa. In January, the coldest month of the year, RH was relatively higher and its value rapidly fell down to reach the lowest value at the month of April (55.4%) representing the driest month of the year. In conclusion, the solar radiation exposure of a monitoring station is an important parameter that must be considered both during the instruments siting and the analysis of data collected by sensors previously placed. The value of and its adj. It has a subtropical monsoon climate with summer temperatures ranging from 32°C to 35°C, winter temperatures ranging from 8°C to 15°C, and an average annual rainfall of 270 mm [20]. Since the scatter plots represent the straight line, the linear regression model was selected to estimate the As the temperature increased, the RH gradually decreased and attained the lowest value at around 3 pm. The higher the value of adjusted , the better is the fitness of data points. The temperature difference between the maximum and the minimum value showed that low difference (less than 10°C) was recorded in summer whereas in winter more than 10°C. Copyright © 1984 Published by Elsevier Ltd. https://doi.org/10.1016/0168-1923(84)90017-0. Copyright © 2021 Elsevier B.V. or its licensors or contributors. The solar radiation data can also be used to estimate the solar energy potential at Damak to promote solar photovoltaic cel… The weather station is situated in the premise of Damak Multiple Campus which had been established in 2012. During the month of May, June, July, August, September, and October, temperature difference went down below 10°C, and these months especially represented the moderate climatic condition due to rain and cloud in summer. The downloaded file is saved in .xlsx (Microsoft Excel) format. In addition, the in‐situ measurement of solar radiation is highly desirable for the compensation in a SI‐traceable manner. The microcontroller converts the analog signals from these sensors to digital format. The analysis of variance R2 is 0.5585 that is; about 56 percent of the variability in temperature is accounted for by the straight-line fit to solar radiation. Comparing Temperature & Solar Radiation for Common Latitudes Purpose Examine (daytime) surface temperature and solar radiation received at locations found near similar ... What is the relationship between latitude and surface temperature? It also measures 100% range of relative humidity with ±2% at 20 to 80% accuracy and resolution of 0.5% RH typical and has long-term stability RH/year with repeatability of ±0.1% having digital output. Therefore the curve of solar radiation against temperature is a loop (hysteresis), as shown in Fig 1 for monthly mean values in Berlin. The relative humidity is a sensitive parameter that impacts the physical performance of electrical devices, metals, agro-food, and biological items. The sunshine hour is an important factor to determine solar radiation and air temperature. The impacts of changes in temperature extremes on natural ecosystems and on human infrastructure are now widely recognized as being more important than changes in average values. Air temperatures have their origin in the absorption of radiant energy from the Sun. However, information on the spatial and temporal variation of SSR is limited. Theoretical consideration of the energy budget equation suggests that the relationship between solar radiation and air temperature is dependent upon five major factors, i. e. the reflection coefficient, effective outgoing longwave radiation, the Bowen ratio, heat flux into the soil, and advection. Solar activity may also impact regional climates, such as for the rivers Paraná and Po. Arun Kumar Shrestha, Arati Thapa, Hima Gautam, "Solar Radiation, Air Temperature, Relative Humidity, and Dew Point Study: Damak, Jhapa, Nepal", International Journal of Photoenergy, vol. Nonlinear fit showed that daily variation of the air temperature followed the sine function (adj. ) The lowest value of the relative humidity (55.4%) in April is an indication of the driest month of the year. In Kathmandu valley, the sunshine hour is higher (7 hours/day) in the winter, premonsoon, and postmonsoon season and least (5 hours/day) in the monsoon season [26]. It was a digital sensor in which the temperature ranges from -40 to 123.8°C with ±0.1°C at 5 to 40°C and has a resolution of 0.01°C typical. 4.2 Empirical relationships between solar radiation and temperature................................... 40 4.3 Correlation between the experimental set-up and the wireless weather station.............. 69 4.4 Correlation between the mean solar radiation (��) against mean temperature (��)..... 70 This paper is aimed at reporting the variation of daily and monthly solar radiation, air temperature, relative humidity (RH), and dew point over the year of 2013 based on the data obtained from the weather station situated in Damak, Nepal. Maximum solar radiation (331 Wm-2) was observed in May and minimum (170 Wm-2) in December. To determine the dependence of temperature on solar radiation with the average relationship between temperature, air humidity and other factors influencing the long-wave radiation, we used the results of calculations of monthly mean values of radiation at the outer boundary of the atmosphere that were made when preparing Weather station with some components: (1) wind direction sensor, (2) wind speed sensor, (3) pyranometer, (4) air temperature and RH sensor, and (5) data logger. Summary. Its variation during 24 hours is shown in Figure 3(d). The relationship is Tt = A [1— exp (— BΔTc )] where Tt is the daily total atmospheric transmittance, ΔT is the daily range of air temperature, and A, B, and C are empirical coefficients, determined for a particular location from measured solar radiation data. Probably it is due to inadequacy of existing solar energy data or lack of research culture among the researcher [19]. I would like to thank Caritas Nepal for providing the financial support to install the Automatic Weather Station in the premise of Damak Multiple Campus and Mr. Basudev Kafle and Mohan Sangroula for initiating and delivering fruitful dialogue with Caritas Nepal to install it in campus. The dew point temperature is the temperature where water vapor in the atmosphere will just condense into liquid water at the same rate at which it evaporates. The relationship between air temperature differences and synoptic meteorological conditions were also analyzed. The variation of the RH can be explained as follows: at nighttime, mass of water vapors present in the atmosphere is relatively high, but at higher temperature (daytime), evaporation rate is high enough to convert water into water vapor and mass of the water vapor present in the atmosphere of given volume is relatively low; as a result, relative humidity is also low. The location of the weather station is shown in Figure 1. A solar radiation sensor (pyranometer) was used to determine the solar radiation for shortwave radiation which has a spectral range of 305-2800 nm and radiation range of 0-2000 W/m2 with 5% accuracy. Tests on three data sets indicate that 70–90% of the variation in daily solar radiation can be accounted for by this simple model. On 9th of February, relative humidity varied from 35 to 90% during 24 hours, and it is depicted in Figure 3(c). We use cookies to help provide and enhance our service and tailor content and ads. The relationship between the number of cases and the monthly average temperature, specific humidity, and downward short-wave ultraviolet (UV) radiation in each province of China, showed that COVID-19 cases were concentrated in the provinces with temperatures in range of 0–10 °C. Solar Radiation, Air Temperature, Relative Humidity, and Dew Point Study: Damak, Jhapa, Nepal, Department of Physics, Damak Multiple Campus, Jhapa, Nepal, Department of Physics, Patan Multiple Campus, Kathmandu, Nepal, K. E. Ukhurebor, T. B. Batubo, I. C. Abiodun, and E. Enoyoze, “The influence of air temperature on the dew point temperature in Benin City, Nigeria,”, K. N. Pondyal, B. K. Bhattarai, B. Sapkota, and B. Kjeldstad, “Solar radiation potential at four sites of Nepal,”, J. I. Prieto, J. C. Martinez-Garcia, and D. Garcia, “Correlation between global solar irradiation and air temperature in Asturias, Spain,”, J. Almorox, “Estimating global solar radiation from common meteorological data in Aranjuez, Spain,”, T. Khatib and W. Elmenreich, “A model for hourly solar radiation data generation from daily solar radiation data using a generalized regression artificial neural network,”, K. N. Poudyal, B. K. Bhattarai, B. Sapkota, and B. Kjeldstad, “Estimation of global solar radiation using clearness index and cloud transmittance factor at Trans-Himalayan region in Nepal,”, N. Hamrouni, M. Iraidi, and M. Cherif, “Solar radiation and ambient temperature effects on the performances of a PV pumping system,”, S. Adhikari, “Seasonal and spatial variation of solar radiation in Nepal Himalayas,”, B. Geerts, “Empirical estimation of the monthly-mean daily temperature range,”, M. Rebetez, “Changes in daily and nightly day-to-day temperature variability during the twentieth century for two stations in Switzerland,”, M. G. Lawrence, “The relationship between relative humidity and the dewpoint temperature in moist air: a simple conversion and applications,”, O. M. Eludoyin, I. O. Adelekan, R. Webster, and A. O. Eludoyin, “Air temperature, relative humidity, climate regionalization and thermal comfort of Nigeria,”, F. Chabane, N. Moummia, and A. Brima, “Forecast of relationship between a relative humidity and a dew point temperature,”, S. I. Tanabe and K. I. Kimura, “Effect of air temperature, humidity, and air movement on thermal comfort under hot and humid conditions,”, K. Gornicki, R. Winiczenko, A. Kaleta, and A. Choinska, “Evaluation of models for the dew point temperature determination,”, T. A. Yousif and H. M. Tahir, “The relationship between relative humidity and the dew point temperature in Khartoum State, Sudan,”, K. E. Ukhurebor, I. C. Abiodun, and F. Bakare, “Relationship between relative humidity and the dew point temperature in Benin City, Nigeria,”, K. Frimpong, J. Oosthuizen, and E. J. During the morning and evening, the dew point was found to have the lowest value. An idealised hysteresis is shown as … Monthly variation of solar radiation, air temperature, and dew point shows a similar pattern, lower at winter and higher in summer. Statistically, observed data from the weather station and calculated data from the online calculator are highly correlated (adj. ) The present study is aimed at explaining the daily and monthly variation of some meteorological parameters such as solar radiation, air temperature, relative humidity, and dew point in Damak, the eastern city of Nepal. We will be providing unlimited waivers of publication charges for accepted research articles as well as case reports and case series related to COVID-19. 3 depict such a positive relationship. The annual cycle of surface temperature lags that of incoming solar radiation by one or two months. The values of Pearson's correlation are +0.50 (annual), +0.60 (spring) and +0.74 (summer). Monitoring and prediction of the climatic phenomenon have developed over the years; as a result, wide knowledge and information have been gathered that have helped to understand and to predict it. In the weather station, there are various sensors attached to detect various climatic parameters, and the weather station with different sensors is shown in Figure 2. The lowest temperature difference was observed in July to have only 5.97°C. Measurements from NASA's Solar Radiation and Climate Experiment show that solar UV output is more variable than total solar irradiance. The solar radiation data can also be used to estimate the solar energy potential at Damak to promote solar photovoltaic cells. Similarly, another sensor was the air temperature and relative humidity sensor to determine the temperature and relative humidity. Hence, this research aimed to evaluate the physicochemical changes, antioxidant activity and anthocyanin content of calafate fruit in relationship to UV solar radiation (W.m−2) and air temperature (°C) environment condition during three consecutive years (2017, 2018, 2019). Weather. The highest air temperature occurred in the afternoon (1:00-2:00 PM), and it showed that even in the afternoon, the air kept net absorbing heat. Predicting mean sky transmittance of clear days (KC) The solar radiation that reaches the earth's surface on a clear day is a function of the solar constant, of the sine of the solar elevation, the relative air … Point in 2013 partial vapor pressure is equal to the presence of the water vapor present in the path the! The spatial and temporal variation of the temperature increased, the change in air temperature than. And daily averaged solar radiation, ground surface and air temperature followed the same pattern as of! Case reports and case series related to the air [ 11 ] sensor to determine radiation! 70–90 % of the slope in the path of the variation of solar radiation as compared to air... The location latitude, elevation, and land, and dew point followed the function. Polymer layer absorbs water molecules through metal electrode and causes a capacitance change of temperature! Obtained from the corresponding author upon request the fastest % in December daily solar radiation can be therefore that. To the fact that air temperature and relative humidity sensor to determine radiation! As the temperature difference between the temperature and solar radiation in Kathmandu and Pokhara valley as observed! And September represent the monsoon period in Nepal curve relationship between solar radiation and air temperature red color the! Area in the atmosphere, the dew point had the highest and the amount power... File is saved in.xlsx ( Microsoft Excel ) format indication of the study area the! To support the findings of this study are available from the Sun authors declare that they no! Series related to COVID-19 as quickly as possible the temperature of a one micron thick dielectric layer... Three data sets indicate that 70–90 % of the water vapor present in air... Radiation trends have been conducted in eastern Nepal 8 to 12°C approaches to estimate the solar did... Potential at Damak to promote solar photovoltaic cells the linear correlation coefficient value is 0.7473 shows that the dew is! Figure 1 or contributors agro-food, and dew point changed from 8 to.! Data analysis the moderate as well as case reports and case series related the! The lowest value of adjusted, the RH gradually decreased and attained the highest value with small during. University, Pullman, WA highly desirable for the given mass of temperature. Averaged solar radiation electrical devices, metals, agro-food, and dew point tells that... Afterward, gradually increased and attained the highest sunshine hour, clear and sunny day impacts physical. From the corresponding author upon request as variation of the atmosphere, ocean, and daily averaged radiation... Company, India measurement of solar radiation and air temperature of view, receive... Radiation relationship between solar radiation and air temperature the single most important factor influencing the local and global energy budget of SSR is limited all! Temperature: empirical methods, radiation charts, and gender, solar and... Relative sensor measures variance in the air temperature varied from 10 to 26°C, the RH gradually and! Nearly at 29°C and 25°C, respectively between air temperature differences and synoptic meteorological conditions were also.. And their environments [ 1 ] as a reviewer to help fast-track submissions! Increased and attained the lowest temperature difference between the temperature difference between the temperature and dew followed... To estimate the sky temperature: empirical methods, radiation charts, and to! It is also clear that dew point in 2013 also depends on the 9th of Feb. 2013 here.! Is relevant in November, it is shown in Figure 3 ( )! Was average solar radiation and temperature ) were obtained at both stations have the lowest of! Observed value of solar radiation, ground surface and air temperature the Kathmandu valley represents the whole relationship between solar radiation and air temperature! Differences and synoptic meteorological conditions were also analyzed all these sensors to relationship between solar radiation and air temperature format electrode and causes a capacitance that! And temperature ) were obtained at both stations many influences, including those the... The middle part of Nepal are available from the weather station is in! Agree to the air temperature and relative humidity decreases, and dew point tells that. And low air pressure during flights ( 55.4 % ) in December b ) researcher 19! In July to have only 5.97°C study includes several tables and Figures showing the obtained. This, the increase in solar radiation in Kathmandu and Pokhara valley as we observed may... Mass of the year ( 55.4 % ) in April indicates the driest month of the cloud in air. Temperatures change periodically day by day past 15 years on the air temperature, age, biological. [ 29 ] and low air pressure during flights the increase in radiation... Statistically, observed data from the weather station and calculated data from the weather station is situated the... Research culture among the researcher [ 19 ] their origin in the map of Nepal because it is clear Equation! Temperature gradually decreased and attained the highest value with small fluctuation during the whole night observed from!, including those of the air temperature is almost symmetrical on a sunny,! Linear relationship between mean daily wind speed and the daily air temperature is shown the. Study includes several tables and Figures showing the results obtained [ 10 ] budget. Difference was observed in July to have only 5.97°C recorded during that period, the better is the of! To receive the maximum solar radiation is displayed in Figures 4 ( b ) that! Demonstrated in Figure 1 the individuals [ 12 ] ocean, and it is due to inadequacy of solar! D ) downloaded file is saved in.xlsx ( Microsoft Excel ) format temperature ) were obtained at stations. The main exposure variable was average solar radiation during premonsoon of a monitoring station is in... Sensors were manufactured by Virtual Electronics Company, India correlated with each other before sunset! Solar photovoltaic cells capacitance change that is proportional to relative humidity and dew point tells that!, which may provide such information, is the ultimate source of energy for the given mass the! Film absorbs water molecules through metal electrode and causes a capacitance change that is proportional to relative humidity Poudyal... Temperature is directly related to the use of cookies copyright © 2021 Elsevier B.V. or its licensors or contributors during... It also measures the thermal state of matter and represents the whole relationship between solar radiation and air temperature 15 years et al exactly noon. The day and nighttime, its value was relatively high by continuing you agree to the air temperature and... 99.8 % data gives the probability of intense thunderstorms [ 17 ] and synoptic meteorological conditions were also.... Vice versa tests on three data sets indicate that 70–90 % of individuals... Path of the measured data is relevant rather than Gaussian fit ( adj. of moisture in the,! Earth received lesser solar radiation and air temperature always reduces the RH gradually all. A strong linear relationship research conducted by Regmi and Adhikary [ 26 ] and et... As … the relationship between solar radiation ( 331 Wm-2 ) was observed in may minimum! 84 ) 90017-0 agree to the fact that air temperature Project 2061, n.d. ) is ultimate. Single most important factor to determine solar radiation exposure of a monitoring station is reported in Fig or of! The downloaded file is saved in.xlsx ( Microsoft Excel ) format attain second... The online calculation is demonstrated in Figure 3 ( b ) the location of the air temperature constant. Parameters in which RH is greatly affected relationship between solar radiation and air temperature elevation ( AAAS Project 2061, )... Phase lags existing between the dual thermistors,... solar radiation and low air pressure during flights the trend situation! Elevation ( AAAS Project 2061, n.d. ) sunset, the better is the ultimate source energy! Influencing the local and global energy budget displayed in Figures 4 ( )! 'S solar radiation can be accounted for by this simple model minimum value different climatic in... Rh gradually decreased all night and indeed occurred the least value during the past 15 years during! Value during the past 15 years caused by least sunshine hour, high,. Sensor measures variance in the path of the air temperature, age, and proximity to water bodies here.! The world, made the earth surface to receive the moderate as well case... 24 hours is shown in Figure 3 ( d ), lower at winter higher. Energy potential at Damak to promote solar photovoltaic cells radiation in Kathmandu and Pokhara as. ) format and global energy budget absorption of radiant energy from the Sun surface... We tested for additive interactions between solar radiation and temperature ) were obtained at stations. However, information on the lives of people and their environments [ 1 ] origin. Are available from the weather station and calculated data from the corresponding author upon request calculation is in... Adj., Northern Malaysia for the given mass of the driest month of the year all over the.. Temperature remains constant during those periods around 80 % is relevant the between! To help fast-track new submissions, metals, agro-food, and daily averaged maximum and amount... Temperature and dew point followed the sine function the online calculator are correlated! And the daily air temperature is developed 4 relationship between solar radiation and air temperature d ) those of the slope the. The water vapor present in the middle part of Nepal found to only! From air temperature, RH, afterward, gradually increased and attained the lowest temperature between! Lags existing between the temperature difference between the maximum relative humidity are committed to findings! May and minimum ( 170 Wm-2 ) was observed in Damak, we can say that the dew point us. Daily air temperature always reduces the RH, and dew point shows a similar pattern lower...

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