| 天气与气候 |
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| Surface Heat and Radiation Budget over Semi-arid Grassland in a Clear Day and a Cloudy Day during Early Spring |
| YUE Ping1,2, NIU Sheng-jie3, ZHANG Qiang1, LIU Xiu-lan2 |
| 1.Key Laboratory of Arid Climatic Changing and Reducing Disaster of Gansu Province/Key Laboratory of Arid Climatic Changing and Reducing Disaster of CMA, Institute of Arid Meteorology, China Meteorology Administration, Lanzhou 730020, China; 2.Zhangye Climatological Observatory, Zhanye 734000, China; 3.Nanjing University of Information Science and Technology, Nanjing 210044, China |
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Abstract By using the micrometeorology data observed at Xilingol grassland on 12—13 March, 2008, the characteristics of diurnal variations (in a clear day and a cloudy day) of surface radiation budget, heat budget and albedo over this semi-arid grassland were researched. On the clear day, the maximal value of total radiation, up-ward short radiation, down-ward long radiation and up-ward long radiation was 801 W·m-2, 203 W·m-2, 197 W·m-2 and 390 W·m-2, respectively. On the cloudy day it was 595 W·m-2, 147 W·m-2, 290 W·m-2 and 182 W·m-2, respectively. As for the sensible heat fluxes, potential heat flux, soil heat flux and net radiation, the value was 6.58 MJ·m-2·d-1, 1.05 MJ·m-2·d-1, -0.25 MJ·m-2·d-1 and 5.89 MJ·m-2·d-1 respectively on a clear day, but only 1.15 MJ·m-2·d-1, 0.49 MJ·m-2·d-1, -0.08 MJ·m-2·d-1 and 1.65 MJ·m-2·d-1 respectively on a cloudy day. In the diurnal curves, the albedo in the morning and afternoon is larger than that at noon on the clear day and the minimal value is 0.23; there is not obvious diurnal fluctuations on the cloudy day and the minimal value is 0.22.
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Received: 29 November 2009
Published: 20 November 2010
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2010, Vol. 30 
