Characteristics of Surface Radiation and Energy Budget over Afforestation Area and Bare Soil over the Gaolan Mountain of Lanzhou City in Winter

AO Yin-huan;CHEN Yu-chun;YANG Sheng-peng

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Plateau Meteorology ›› 2007, Vol. 26 ›› Issue (4) : 693-700.

Characteristics of Surface Radiation and Energy Budget over Afforestation Area and Bare Soil over the Gaolan Mountain of Lanzhou City in Winter

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Abstract

Using the land-atmosphere interaction data observed at the Gaolan mountain of Lanzhou city from 9 to 29 December 2005,the daily variation characteristics of surface radiation,energy budget,soil temperature and moisture were compared and analyzed over afforestation area and bare soil at typical clear day and average condition in winter.The global radiation and downward atmospheric radiation in afforestation area are similar to that in bare soil,while the reflected solar radiation and ground surface long wave up-ward radiation are quite different between these two kinds of ground surface because of the difference of surface characteristics.In winter,the sensible heat flux played a leading role,and soil heat flux and latent heat flux were very small,especially the latent heat flux,which peak value was often under 10 W·m-2.It was very interesting to note that the sensible heat flux was higher over the afforestation area than the ones at the bare soil during observation,which deserved further study.In winter the characteristics of the averaged daily variation was very close to the ones under a typical clear day,from which we concluded that the influence of cloud and snow was very limited.The daily mean albedo in both of the afforestation area and bare soil are relative stability,it varies between 0.20~0.28 in afforestation area and 0.25~0.31 in bare soil,averaged of 0.21 and 0.29,respectively.

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Lanzhou city / Afforestation area / Bare soil / Radiation balance / Energy balance

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AO Yin-huan , CHEN Yu-chun , YANG Sheng-peng. Characteristics of Surface Radiation and Energy Budget over Afforestation Area and Bare Soil over the Gaolan Mountain of Lanzhou City in Winter. Plateau Meteorology. 2007, 26(4): 693-700

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