Moisture budget variations in the Yangtze River Basin, China, and possible associations with large-scale circulation |
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| Authors: | Zengxin Zhang Hui Tao Qiang Zhang Jinchi Zhang Nicola Forher Georg Hörmann |
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| Institution: | (1) Jiangsu Key Laboratory of Forestry Ecological Engineering, Nanjing Forestry University, 210037 Nanjing, China;(2) Nanjing Institute of Geography and Limnology, Chinese Academy of Science, 210008 Nanjing, China;(3) Department of Water Resources and Environment, Sun Yat-sen University, 510275 Guangzhou, China;(4) Department of Hydrology and Water Resources and Management, Christian-Albrechts Universtiy, 24098 Kiel, Germany |
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| Abstract: | We analyzed seasonal and annual variations of the whole layer atmospheric moisture budget and precipitation during 1961–2005
and their associations with large-scale circulation in the Yangtze River basin, China. The results indicated increasing moisture
budget in summer and winter, but decreasing moisture budget in spring and autumn. Positive correlations between moisture budget
and precipitation illustrate tremendous impacts the moisture budget has on the precipitation changes across the Yangtze River
basin. In terms of seasonal variations, significant correlations were observed between precipitation and moisture budget in
spring and autumn in the upper Yangtze River basin. Besides, we also analyzed changes of geopotential height. The positive
trends of the geopotential height (850 hPa) were observed in the East Asia and the negative trends in the middle and west
Pacific Ocean, indicating increasing geopotential height from south to north in east Asia which largely limited the moisture
propagation to north China. While decreasing meridional geopotential height from west to east along the Yangtze River basin
caused more moisture propagation from the west to the east parts of the study region, which may benefit more precipitation
in the middle and lower Yangtze River basin. |
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