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青藏高原蒸散变化及其影响因素
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Abstract:
为进一步研究青藏高原东部陆面地水、热交换过程对本区域乃至全球气候变化与环境变化的影响；通过对四个蒸散产品与三个站点(QMOS, NAMORS, SETORS)的实际观测值，计算得出的决定系数和均方根误差，对比得到最适合高原地区的蒸散产品；再通过运用此产品，来分析高原区域的蒸散长期变化特征、平均ET空间分布、变率的空间分布，线性趋势空间分布和高原整体的ET时间变化；再根据实际分析情况，划分出子区域分析子区域30年的时间序列。最后结合气象环境数据来分析其气象要素与蒸散变化的相关性，揭示蒸散变化的主导因素。
In order to further study the impact of land surface water and heat exchange processes in the eastern Qinghai-Tibet Plateau on climate change and environmental change in this region and even the world, by comparing the determined coefficient and root mean square error, the most suitable evapotranspiration product in the plateau area is obtained; then, by using this product, the long-term variation characteristics of evapotranspiration, the average ET spatial distribution, the spatial distribution of variability, and the linear trend space in the plateau area are analyzed. The distribution and the ET time change of the plateau as a whole; and then according to the actual analysis situation, the 30-year time series of sub-regions is divided into sub-regions for analysis. Finally, the correlation between meteorological elements and evapotranspiration changes was analyzed based on the meteorological environment data, and the dominant factors of evapotranspiration changes were revealed.
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