Relationship between temperature and humidity pdf

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Solar Radiation, Air Temperature, Relative Humidity, and Dew Point Study: Damak, Jhapa, Nepal

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. 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 based on the data obtained from the weather station situated in Damak, Nepal.

The result shows that on a clear day, the variation of solar radiation and RH follows the Gaussian function in which the first one has an upward trend and the second one has a downward trend.

However, the change in air temperature satisfies the sine function. The dew point temperature shows somewhat complex behavior. Monthly variation of solar radiation, air temperature, and dew point shows a similar pattern, lower at winter and higher in summer. The lowest value of the relative humidity Dew point was also calculated from the actual readings of air temperature and relative humidity using the online calculator, and the calculated value showed the exact linear relationship with the observed value.

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. More importantly, climatic change has a great influence on the lives of people and their environments [ 1 ]. It is influenced by the location latitude, elevation, and proximity to water bodies.

Solar radiation is one of the important parameters to study climate change, environmental pollution, crop production, food industry, and hydrology [ 2 ]. 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 ]. Hence, the total solar radiation potential will be a key factor for designing and predicting the performance of solar energy equipment [ 6 — 8 ].

Temperature is a measure of the thermal state of matter and represents the degree of hotness or coldness of a body.

It is a widely measured variable to determine the change in weather because it influences or controls other elements of the weather, such as the dew point temperature, precipitation, humidity, clouds, and atmospheric pressure [ 9 ]. 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. Climatic variability is also important for the human perception of climate [ 10 ].

The relative humidity and dew point temperature are widely used indicators of the amount of moisture in the air [ 11 ]. The relative humidity is a sensitive parameter that impacts the physical performance of electrical devices, metals, agro-food, and biological items. It also measures the thermal discomfort of the individuals [ 12 ]. There are numerous factors such as dew point temperature, ambient temperature, and solar radiation that can combine to influence relative humidity [ 13 ].

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. It can be therefore stated that the partial vapor pressure is equal to the partial saturation vapor pressure at the dew point temperature.

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 ]. Many studies on recent temperature and solar radiation trends have been carried out all over the world. 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 ].

The ground-based weather station is a very reliable and authentic source to generate the meteorological data for climatic research, and still, it is used to collect the data from different stations for the study of spatial and temporal variation.

Available literatures show that few and limited studies have been conducted in eastern Nepal. Probably it is due to inadequacy of existing solar energy data or lack of research culture among the researcher [ 19 ]. 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.

The weather station is situated in the premise of Damak Multiple Campus which had been established in The location of the weather station is shown in Figure 1. Similarly, another sensor was the air temperature and relative humidity sensor to determine the temperature and relative humidity.

It was a digital sensor in which the temperature ranges from to The relative sensor measures variance in the capacitance change of a one micron thick dielectric polymer layer. This film absorbs water molecules through metal electrode and causes a capacitance change that is proportional to relative humidity. All these sensors were manufactured by Virtual Electronics Company, India.

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.

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. The microcontroller converts the analog signals from these sensors to digital format. The downloaded file is saved in. The instantaneous intensity of global solar radiation, air temperature, relative humidity, and dew point measured on 09 February has been depicted in Figure 3. 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.

However, due to the presence of the cloud in the path of the sunlight, some irregularities were found in the trend.

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. Again, the increasing or decreasing trend of solar radiation is almost symmetrical on a sunny day. The variation of the daily air temperature is shown in Figure 3 b. The highest air temperature occurred in the afternoon PM , and it showed that even in the afternoon, the air kept net absorbing heat.

However, afternoon, air temperature gradually decreased all night and indeed occurred the least value during the early morning. Nonlinear fit showed that daily variation of the air temperature followed the sine function adj. Just after the sunrise and just before the sunset, the air temperature is rising and dropping the fastest. 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.

It is due to the fact that light is easily absorbed by the earth surface and converts into heat energy, but once the heat is generated, it is not easily escaped from the atmosphere because the atmosphere acts as a blanket and blocks the outgoing radiation. The relative humidity is inversely related to the air temperature.

If temperature increases, the relative humidity decreases, and vice versa. Thereafter, RH rapidly increased and attained the highest value with small fluctuation during the whole night. 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 variation of air temperature followed the sine function whereas the relative humidity followed the Gaussian fit [ 23 ] in which the - adjusted value is 0. Dew point temperature is the function of RH and air temperature. Its variation during 24 hours is shown in Figure 3 d. During the morning and evening, the dew point was found to have the lowest value.

However, on the day and nighttime, its value was relatively high. Air temperature and relative humidity are two different climatic parameters in which RH is greatly affected by the air temperature. For the given mass of the water vapor present in the atmosphere, the increase in air temperature always reduces the RH.

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.

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 The RH, afterward, gradually increased and became nearly constant during the rainy seasons. It is obvious that combination of high temperature and humidity is inimical to human health especially on people who work outside and responsible for the cases of increased heatstroke [ 25 ].

The sunshine hour is an important factor to determine solar radiation and air temperature. The data of the Kathmandu valley represents the whole part of Nepal because it is situated in the middle part of Nepal. The variation of the air temperature and solar radiation is displayed in Figures 4 a and 4 b. The research conducted by Regmi and Adhikary [ 26 ] and Poudyal et al. 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.

April and May represent the premonsoon period. The highest sunshine hour, clear and sunny day, made the earth surface to receive the maximum solar radiation during premonsoon. June, July, August, and September represent the monsoon period in Nepal. During that period, the earth received lesser solar radiation as compared to the premonsoon period.

It was primarily caused by least sunshine hour, high precipitation, and cloud [ 29 ]. However, air temperature remains constant during those periods. The variation of average monthly dew point is exhibited in Figure 4 d.

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. Finally, it fell sharply to attain the second minimum values of 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.

The monthly observed value of RH obtained from the weather station and the online calculation is demonstrated in Figure 5. Both observed and online calculated value are highly correlated with each other. The online calculator estimates the dew point on the input data of air temperature and relative humidity using the mathematical relation given in Equation 1 [ 11 ].

The higher the value of adjusted , the better is the fitness of data points. The value of and its adj. From the statistical point of view, we can say that the quality of the measured data is relevant. 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. Figure 6 presents the significant variation of the temperature difference between the highest and the lowest value for the year The lowest temperature difference was observed in July to have only 5.

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. Overall, in Damak, we receive the moderate as well as extreme climatic condition throughout the year. It is due to the fact that air temperature is directly related to the global solar radiation. So, increase in solar radiation increases the air temperature. Similarly, dew point also depends on the air temperature and relative humidity, and it is clear from Equation 1.

Hence, it is also clear that dew point is significantly correlated with solar radiation.

How Temperature & Humidity are Related

Understanding these phenomena requires knowledge of the interaction between temperature and humidity. Temperature affects humidity, which in turn affects the potential for precipitation. The interaction of temperature and humidity also directly affects the health and well-being of humans. Relative humidity and dew point, values commonly used by meteorologists, give the means to understand this interaction. Temperature and humidity affect the Earth's weather, human health and human well-being. Air temperature changes affect how much water vapor the air can hold. Values such as relative humidity and dew point help describe these effects on weather.

Humidity is the concentration of water vapor present in the air. Water vapor, the gaseous state of water, is generally invisible to the human eye. Humidity depends on the temperature and pressure of the system of interest. The same amount of water vapor results in higher humidity in cool air than warm air. A related parameter is the dew point. The amount of water vapor needed to achieve saturation increases as the temperature increases. As the temperature of a parcel of air decreases it will eventually reach the saturation point without adding or losing water mass.

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: The relative humidity RH and the dewpoint temperature td are two widely used indicators of the amount of moisture in air. The exact conversion from RH to td, as well as highly accurate approximations, are too complex to be done easily without the help of a calculator or computer.

How Temperature & Humidity are Related

Tables that show the effect of temperature upon the saturation mixing ratio r w are readily available. Humidity of the air at saturation is expressed more commonly, however, as vapour pressure. Thus, it is necessary to understand vapour pressure and in particular the gaseous nature of water vapour.

The impacts of warm season heat extremes are dependent on both temperature and humidity, so it is critical to properly model their relationship, including how it may be changing. This presents statistical challenges because the bivariate temperature—humidity measured here by dew point distribution is complex and spatially variable. Here, we develop a flexible, semiparametric model based on quantile smoothing splines to summarize the distributional dependence of dew point on temperature, including how the dependence is changing with increasing global mean temperature.

Relation between temperature and humidity

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. 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 based on the data obtained from the weather station situated in Damak, Nepal. The result shows that on a clear day, the variation of solar radiation and RH follows the Gaussian function in which the first one has an upward trend and the second one has a downward trend.

Solar Radiation, Air Temperature, Relative Humidity, and Dew Point Study: Damak, Jhapa, Nepal

This observational study examined the association of temperature, humidity and rainfall with six common climate-sensitive infectious diseases in adults malaria, diarrheal disease, enteric fever, encephalitis, pneumonia and bacterial meningitis in northeastern Bangladesh. Subjects admitted to the adult medicine ward of a tertiary referral hospital in Sylhet, Bangladesh from to with a diagnosis of one of the six chosen climate-sensitive infectious diseases were enrolled in the study. Climate-related data were collected from the Bangladesh Meteorological Institute.

Humidity is a measure of the amount of moisture in the air. It tells you how comfortable it is to be outside, and if there is enough moisture to create clouds and rain. Why do I care? Humidity has a large impact on human and animal health and the health of crops.

The relationship between relative humidity and the dewpoint temperature in moist air - A simple conversion and applications Published on Feb 1, in Bulletin of the American Meteorological Society 9. Mark Lawrence 62 Estimated H-index: Find in Lib. Add to Collection. The relative humidity RH and the dewpoint temperature td are two widely used indicators of the amount of moisture in air. The exact conversion from RH to td, as well as highly accurate approximations, are too complex to be done easily without the help of a calculator or computer.


The relative humidity (RH) and the dewpoint temperature (td) are two widely used indicators of the amount of m | Mark Lawrence | Bulletin of the American.


Correction

The relationship between relative humidity and the dewpoint temperature in moist air - A simple conversion and applications Published on Feb 1, in Bulletin of the American Meteorological Society 9. Mark Lawrence 62 Estimated H-index: Find in Lib. Add to Collection. The relative humidity RH and the dewpoint temperature td are two widely used indicators of the amount of moisture in air. The exact conversion from RH to td, as well as highly accurate approximations, are too complex to be done easily without the help of a calculator or computer. This article examines the mathematical basis and accuracy of this and other relationships between the dewpoint and relative humidity.

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  • The practice of business statistics using data for decisions 2nd edition pdf disaster recovery using vmware vsphere replication and vcenter site recovery manager pdf Dominique L. - 24.03.2021 at 07:02
  • The objective of the study was to determine the relationship between relative humidity (RH) and dew point temperature (Td) in Khartoum State. Disgiofollai - 28.03.2021 at 04:00

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