Spatiotemporal analysis of precipitation trends in the Yangtze River catchment
Spatiotemporal analysis of precipitation trends in the Yangtze River catchment
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DOI：
10.1007/s00477-006-0036-7
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发表时间：
2006-02
影响因子：
4.2
通讯作者：
S. Becker;M. Gemmer;T. Jiang
中科院分区：
文献类型：
--
作者：
S. Becker;M. Gemmer;T. Jiang
应用Mann-Kendall趋势检验和地理空间分析，分析了长江流域（中国）近50年来的降水趋势。计算了36个测站的月降水量趋势。在夏季的几个月里，许多观测站都可以观察到显著的正趋势，这自然显示出降水量的最大值。在这之前和（或）之后都出现了消极趋势。这一观测结果表明，夏季降水集中在较短的时间内。在0.5°分辨率的网格化基础上对第二组数据的分析显示了具有不同空间模式的趋势。经典的趋势测试和空间内插的降水数据集相结合，可以检测到的趋势的时空可视化。有积极趋势的月份强调了一个区域的严重局势的恶化，这个区域在夏季特别容易发生洪水灾害。观测到的趋势的原因被发现在850 hPa的纬向风型的变化，这占了暖湿空气的输送到长江流域在夏季的几个月。
Precipitation trends in the Yangtze River catchment (PR China) have been analyzed for the past 50 years by applying the Mann-Kendall trend test and geospatial analyses. Monthly precipitation trends of 36 stations have been calculated. Significant positive trends at many stations can be observed for the summer months, which naturally show precipitation maxima. They were preceded and/or followed by negative trends. This observation points towards a concentration of summer precipitation within a shorter period of time. The analysis of a second data set on a gridded basis with 0.5° resolution reveals trends with distinct spatial patterns. The combination of classic trend tests and spatially interpolated precipitation data sets allows the spatiotemporal visualization of detected trends. Months with positive trends emphasize the aggravation of severe situation in a region, which is particularly prone to flood disasters during summer. Reasons for the observed trends were found in variations in the meridional wind pattern at the 850 hPa level, which account for an increased transport of warm moist air to the Yangtze River catchment during the summer months.