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Change Features of Surface Albedo of Semi-Arid Grassland over the Loess Plateau of Middle Part Gansu

Journal

Plateau Meteorology

Authors

Li Deshuai, Wang Jinyan, Wang Shigong, Li Zhenchao, Shang Kezheng, Shi Jinsen

Year

2014

Volume

33

Issue

1

Pages

89-96

Corresponding Author

Li, DS

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Keywords

Loess Plateau; Semi-arid grassland; Surface albedo; Weather process

Abstract

The annual variation of the surface albedo of semi-arid grassland, and its variation characteristics under typical weather conditions over the Loess Plateau of middle part Gansu were analyzed by using the observation data of Semi-Arid Climate Observatory and Laboratory of Lanzhou University (SACOL) in the whole year of 2010. The results show that: The surface albedo of semi-arid grassland over the Loess Plateau of middle part Gansu is higher in winter half year than that in summer half year, and the annual average surface albedo is 0.21, which is higher than that in oasis regions, but lower than that in the semi-arid farmlands. In addition, weather conditions obviously have impacts on the diurnal variation of the surface albedo. In sunny days, the surface albedo is higher in morning and evening but relatively lower at noon, while it has little variation in cloudy days; The surface albedo firstly decreases and then increases after rainfall, while firstly increases and then decreases after snowfall. Moreover, the surface albedo is a little higher in dust weather than that in sunny days. Surface albedo is significantly asymmetric in sunny days, namely the surface albedo is higher in early morning than that in late afternoon at the same solar elevation. The difference has good agreement with the variation of shallow soil moisture. The results of this study have a certain scientific value in determining the surface albedo, verifying and improving models' ability to simulate weather and climate.
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