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采用与先进陆面模式耦合的区域气候模式WRF V3.1,利用NCEP/DOE再分析资料作为驱动场,对青藏高原东北部1998年5-7月进行模拟.首先,对模拟区降水、感热和潜热通量的空间分布进行了检验,结果表明WRF模式能够合理且较好的模拟出高原东北部降水、感热和潜热通量的空间分布状况.通过对融冻过程中土壤温、湿度及水文要素的分析发现,融冻过程首先影响土壤温、湿度,进而影响地气间能量和水分交换,最终影响整个局地水循环过程.冻结时,感热通量占主要地位,陆地系统净水分输入主要转化为蒸发和径流,水分盈余变化基本为零;融化后,潜热通量占主要地位,随着降水量增大和土壤下渗能力的增强,陆地系统水分盈余迅速增大,径流相应减小.但不同下垫面上略有差别,草地、灌木丛、稀疏植被和苔原上水循环要素的变化趋势与区域平均基本类似,水分盈余变化呈增大的趋势,沿水体周围草地的水分盈余随时间减小,水体上的水循环活动最为剧烈,水分盈余最为丰富.
Using the regional climate model WRF V3.1 coupled with the advanced land surface model, the NCEP / DOE reanalysis data was used as the driving field to simulate the northeastern Qinghai-Tibet Plateau from May to July 1998. Firstly, the precipitation, sensible heat And the latent heat flux were tested.The results show that the WRF model can reasonably and well simulate the spatial distribution of precipitation, sensible heat and latent heat flux in northeastern plateau.Through the analysis of the soil temperature, humidity and The analysis of hydrological factors shows that the thawing process firstly affects the soil temperature and humidity, and then affects the energy and water exchange between the ground and the air, finally affecting the entire local water cycle. At the time of freezing, the sensible heat flux dominated and the net water content of the terrestrial system The input mainly transforms into evaporation and runoff, and the change of water surplus is almost zero. After thawing, the latent heat flux occupies the main position. With the increase of precipitation and the infiltration of soil, the surplus of water in land system increases rapidly and the runoff decreases However, there was a slight difference on the underlying surface, and the trend of water cycle elements in grassland, shrub, sparse vegetation and tundra was basically similar to the regional average, and the variation of water surplus increased Potential surplus water along the grass around the body of water decreases with time, the water cycle activity on the water the most violent, the most abundant moisture surplus.