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摘要
Based on the data from the Naqu Station of Plateau Climate and Environment in the Northern Qinghai-Tibetan Plateau, this paper investigates the relative humidity close to the underlying surface and the bulk transfer coefficient over the underlying surface of typical alpine grassland in the Naqu area of the Qinghai-Tibetan Plateau. On this basis, using the conventional observation data from the Naqu Weather Station of the China Meteorological Administration from 1980 to 2016 to calculate and analyze the characteristics of surface fluxes over alpine grassland in Qinghai-Tibetan Plateau. The results suggest that: (1) The monthly average of the relative humidity close to the underlying surface at Naqu Station is between 33% and 62%, the highest is in September, and the lowest is in February, the monthly mean bulk transfer coefficient for heat CH at Naqu Station vary from 1. 6×10-3 to 2. 7×10-3, and the monthly mean bulk transfer coefficient for vapor Cλ at Naqu Station vary from 1. 0×10-3 to 2. 0×10-3. (2) The surface fluxes at Naqu area from 1980 to 2016 are calculated, the annually averaged sensible heat fluxes H showed a weakening trend, while the latent heat fluxes showed an increasing trend, which led to the inconspicuous trend of surface heat source. In stages, the mutation of sensible heat fluxes occurred in 2004, the trend before and after the turning point was firstly weakened and then increased, the latent heat fluxes decreased significantly from 1994 to 2005, which led to a significant reduction in surface heat source from 1995 to 2005. (3) The seasonal variation of latent heat fluxes at Naqu Station is more obvious than the change in sensible heat fluxes, the seasonal variation of the surface heat source is more dependent on the seasonal variation of latent heat fluxes.
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