干旱地区不同下垫面的辐射收支

CHARACTERISTICS OF RADIATION BUDGET ON DIFFERENT UNDERLYING SURFACES IN THE ARID REGION

利用2000年6月2001年5月在干旱地区敦煌和高原北部的五道梁所获取的太阳辐射观测资料,分析研究了干旱地区不同下垫面的加辐射收支特点。结果表明:虽然两地地理位置和海拔高度不同,但由于两地下垫面条件的差异,使得太阳短波辐射特别是地表吸收辐射在夏季大致相近,冬季则是敦煌小于五道梁;长波辐射(地面向上长波辐射和大气逆辐射)郭煌明显大于五道梁;地表净辐射夏季五道梁比敦煌为大,冬季则两地相近。

The characteristics of radiation budget on different underlying surface were discussed by using the data observed at Dunhuang and Wudaoliang in the arid region for the period from June 2000 to May 2001. The results show that the absorption of short-wave radiation at surface is close for the two places in summer although the geographical latitude and A.S.L are different at Dunhuang and at Wudaoliang, the absorption of short-wave radiation at surface at Dunhuand is smaller than that at Wudaoliang in winter. The upward and downward long-wave radiation at Dunhuang are larger than that at Wudaoliang in summer and winter. The surface net radiation at Dunhuang is smaller than that at Wudaoliang in summer and it is close to that at Wudaoliang in winter.