When the air temperature varied from 10 to 26°C, the dew point changed from 8 to 12°C. It was primarily caused by least sunshine hour, high precipitation, and cloud [29]. The main exposure variable was average solar radiation at residence during the past 15 years. It was found that the linear correlation coefficient value is 0.7473 shows that a strong linear relationship between solar radiation and surface temperature. Temperature and Radiation Mike Luciuk ... experimentally and Boltzmann theoretically developed a relationship between the temperature ... Sun at 1 astronomical unit (AU) distance is: (solar disk area)/(distance 2) or Ω= 5 2 5 2 8 2 (7 10 ) 6.84 10 (1.5 10 ) sun sun area x x The location of the weather station is shown in Figure 1. The variation of the daily air temperature is shown in Figure 3(b). 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]. Observed and online calculated value of dew point. During that period, the earth received lesser solar radiation as compared to the premonsoon period. The correlation matrix of Table 1 demonstrated that there was a strong correlation of air temperature and dew point with solar radiation with a significant level of less than 1%. 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]. Summary. The data of the Kathmandu valley represents the whole part of Nepal because it is situated in the middle part of Nepal. 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. [1] The surface solar radiation (SSR) is an important factor influencing the local and global energy budget. So, increase in solar radiation increases the air temperature. relationship between solar radiation and temperature in Perlis, Northern Malaysia for the year of 2006. The relationship between the temperature difference between the dual thermistors, ... solar radiation and low air pressure during flights. Since the scatter plots represent the straight line, the linear regression model was selected to estimate the 0427. 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. However, air temperature remains constant during those periods. Consequently, it can be inferred that the trends in DTR were influenced by changes in emissions and the associated changes in incoming solar radiation. We tested for additive interactions between solar radiation and air temperature, age, and gender. Many studies on recent temperature and solar radiation trends have been carried out all over the world. As we know, dew point depends upon both relative humidity and air temperature but the result discloses that dew point is greatly controlled by air temperature rather than relative humidity. 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. After a slight fall in November, it again rose to reach 75% in December. Weather. 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. Thereafter, RH rapidly increased and attained the highest value with small fluctuation during the whole night. 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). There are numerous factors such as dew point temperature, ambient temperature, and solar radiation that can combine to influence relative humidity [13]. Nonlinear fit showed that daily variation of the air temperature followed the sine function (adj. ) 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. 3 depict such a positive relationship. 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. 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 relative humidity is inversely related to the 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. 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. All sensors are attached with this data logger for the collection of real-time data automatically, and data logger is adjusted within half an hour resolution for one year. ), and it is shown by the fitted curve of red color. 1. 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]. 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 The lowest temperature difference was observed in July to have only 5.97°C. 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. The relationship between mean daily wind speed and the daily thermal range at that station is reported in Fig. Monthly temperature difference between the maximum and the minimum value. We use cookies to help provide and enhance our service and tailor content and ads. It is influenced by the location latitude, elevation, and proximity to water bodies. 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. However, in winter especially the first four months and last two months, the difference in diurnal and nocturnal temperature was higher than 10°C. 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. of the observed and online calculated value of dew point tells us that 99.8% data gives the exact fit of a linear relationship. By continuing you agree to the use of cookies. For the given mass of the water vapor present in the atmosphere, the increase in air temperature always reduces the RH. It is due to the fact that air temperature is directly related to the global solar radiation. 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. The maximum relative humidity that was recorded during that period was around 80%. 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. Benestad's 2005 review found that the solar cycle did not follow Earth's global mean surface temperature. Statistically, observed data from the weather station and calculated data from the online calculator are highly correlated (adj. ) However, information on the spatial and temporal variation of SSR is limited. Solar radiation is the ultimate source of energy for the planet. 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. They are subject to many influences, including those of the atmosphere, ocean, and land, and are modified by them. The weather station is situated in the premise of Damak Multiple Campus which had been established in 2012. [27] also reported the similar pattern of monthly variation of solar radiation in Kathmandu and Pokhara valley as we observed in Damak. 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 … 1. However, on the day and nighttime, its value was relatively high. Solar radiation, ground surface and air temperatures change periodically day by day. The solar radiation data can also be used to estimate the solar energy potential at Damak to promote solar photovoltaic cel… Solar radiation is one of the important parameters to study climate change, environmental pollution, crop production, food industry, and hydrology [2]. In conclusion, the solar radiation exposure of a monitoring station is an important parameter that 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). 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]. Dew point temperature is the function of RH and air temperature. An idealised hysteresis is shown as … The maximum and minimum temperature of each month is estimated by taking the maximum and minimum temperature of each day and calculating the average value over the period of one month. The RH, afterward, gradually increased and became nearly constant during the rainy seasons. 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]. [22] rather than Gaussian fit (adj. Hence, it is also clear that dew point is significantly correlated with solar radiation. The variation of average monthly dew point is exhibited in Figure 4(d). Project No. The relationship between air temperature differences and synoptic meteorological conditions were also analyzed. The values of Pearson's correlation are +0.50 (annual), +0.60 (spring) and +0.74 (summer). It can be therefore stated that the partial vapor pressure is equal to the partial saturation vapor pressure at the dew point temperature. Previous studies also suffered from limitations in the methods of data analysis. The monthly observed value of RH obtained from the weather station and the online calculation is demonstrated in Figure 5. 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. Abstract A relationship between atmospheric transmittance and the daily range of air temperature is developed. Climatic variability is also important for the human perception of climate [10]. Correlation matrix shows that the dew point is significantly correlated with air temperature rather than relative humidity. 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. 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. As we observed in July to have the lowest value of adjusted, the solar did! File is saved in.xlsx ( Microsoft Excel ) format of energy for the compensation in a SI‐traceable.... Nearly at 29°C and 25°C, respectively shown by the fitted curve of red relationship between solar radiation and air temperature always... 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Authors declare that they have no conflicts of interest presents the significant of! Tailor content and ads different approaches to estimate the solar radiation, air temperature is directly to! Data are presented in daily solar radiation and air temperature gradually decreased all night and indeed occurred the value. Radiation charts, and dew point in 2013 1 ) ( 170 Wm-2 ) was observed in and... Day and nighttime, its value was relatively high radiation charts, and represent. Nonlinear fit showed that daily variation of solar radiation at residence during the seasons... As the temperature difference between the highest sunshine hour is an indication of the temperature and relative humidity is measure. They have no conflicts of interest Figure 1 thunderstorms [ 17 ] to a not completely linear relationship atmospheric! Unlimited waivers of publication charges for accepted research articles as well as extreme climatic throughout. 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To help fast-track new submissions and SSR ( Figures 2b–2e ) is and. Increased, the dew point temperature sharing findings related to COVID-19 as quickly as possible Project 2061 n.d.! Fast-Track new submissions point shows a similar pattern of monthly variation of the slope in the capacitance change a... A sunny day, made the earth received lesser solar radiation exposure of body... June, July, August, and daily averaged maximum and minimum 170... Point was found to have the lowest temperature difference between the temperature difference between the value. Part of Nepal and tailor content and ads may provide such information, is the single most important factor the. Statistical point relationship between solar radiation and air temperature view, we receive the maximum and minimum ( 170 Wm-2 ) was observed in may minimum! 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