Influence of solar radiation reflectance on water evaporation

This paper presents the distribution features of observed meteorological parameters in Truong Sa archipelago area including wind, tropical cyclone, and average values of solar radiation, air temperature, air humidity, rainfall. Observed data were collected from Truong Sa island hydro-meteorological station. In particular, data of tropical cyclones affecting Truong Sa archipelago area were collected from the websites http://www.jma.go.jp/jma/jma-eng/jma-center/(Japan). Study results show that the main meteorological parameters in Truong Sa archipelago area are affected by solar radiation and monsoonal wind regimes in East Asia region which are Northeast monsoon occurring from November to April and Southwest monsoon occurring from June to September. Transition periods are May and October. Tropical cyclones occur mainly in November–December, maximum wind speed was 64 m/s in typhoon HAIYAN (November 2013). The highest average solar radiation occurs in April (277 hours), the lowest in January (181 hours). The highest average air temperature occurs in April (29.5oC), the lowest in January (26.6oC). The highest average rainfall occurs in November (341 mm), the lowest in March (62 mm). The highest average air humidity occurs in November–December (85%), the lowest in April–May (79%). The highest average water evaporation occurs in March (129 mm), the lowest in December (87 mm).

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Variation characteristics and influencing factors of free water evaporation in recent 58 years in Tai’an area

MATEC Web of Conferences ◽

10.1051/matecconf/201824602003 ◽

2018 ◽

Vol 246 ◽

pp. 02003

Author(s):

Kun Yan ◽

Min-Zhi Yang ◽

Shang Gao ◽

Jie-Yu Li

Keyword(s):

Wind Speed ◽

Solar Radiation ◽

Air Temperature ◽

Dominant Role ◽

Water Vapor Pressure ◽

Estimation Method ◽

Free Water ◽

Negative Influence ◽

Mean Value ◽

Water Evaporation

The mutation test and trend analysis of free water evaporation in Tai’an from 1956 to 2013 were carried out with Pettitt detection method, Mann-Kendall method and linear tendency estimation method. The results indicate that: (1) the free water evaporation in Tai’an was distributed unevenly within the year, and the maximum appeared in June, accounting for 14.5% of the whole year; (2) in the last 58 years, the free water evaporation in Tai’an changed significantly in 1985. The evaporation decreased obviously before the change, then fluctuated around the mean value, and gradually became stable; (3) by means of correlation analysis and partial differential decomposition, it was found that free water evaporation in Tai’an before 1985 was positively correlated with air temperature, solar radiation and wind speed, and negatively correlated with actual water vapor pressure. The significant decrease in solar radiation and wind speed are the main reasons for the significant decline in annual evaporation; (4) after 1985, the air temperature played a dominant role, and the rise of air temperature offset the negative influence of decline of wind speed and solar radiation on the free water evaporation.

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Potential of sand as a medium of water evaporation – A Review

Journal of Aridland Agriculture ◽

10.25081/jaa.2020.v6.6420 ◽

2020 ◽

pp. 18-22

Author(s):

Natasya Ghinna Humaira ◽

Abdul Hamid ◽

Sarwoko Mangkoedihardjo

Keyword(s):

Particle Size ◽

Wind Speed ◽

Hydraulic Conductivity ◽

Relative Humidity ◽

Solar Radiation ◽

Water Table ◽

Water Evaporation ◽

Vapor Pressure Difference ◽

Factors Influencing ◽

Potential Applicability

The purpose of this review is to give an up to date overview of the existing literature on water evaporation from the sand. The paper summarizes the factors influencing evaporation rates in water evaporation from sand such as solar radiation, air temperature, air moisture, the temperature at the water-table, relative humidity of the air, depth of the ground water table, wind speed, vapor pressure difference, sand capillary, hydraulic conductivity and particle size of sand. Limitations and constraints identifying existing gaps are discussed, as well as the potential applicability.

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