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Assessing the changes in hydrological budget including anthropogenic effect estimated by the reanalyses and rain-gauge based precipitation data over Asia

评估水文预算的变化，包括通过重新分析和基于亚洲雨量计的降水数据估计的人为影响

基本信息

批准号：
19540467
负责人：
YATAGAI Akiyo
金额：
$ 2.91万
依托单位：
Research Institute for Humanity and Nature
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2007
资助国家：
日本
起止时间：
2007 至 2009
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19540467/
关键词：
気候変動水循環環境変動大気現象水資源

项目摘要

With the benefit of the reanalysis datasets, the 25-50 years change in atmospheric hydrological budget should be clarified, and increase in evapotranspiration (Et) caused by the increase in agricultural water use may be identified. Analyses have been done on the interannual change of hydrological budget over Asia, by using meteorological reanalyses data and a rain-gauge based grid precipitation dataset developed by the APHRODITE project (Yatagai et al., 2009), in which more than 4 times rain-gauge data available through the global telecommunication system (GTS) network is used and orographic precipitation is taken into account. As for the reanalysis, we used ERA40 data compiled by the European Centre for Medium Range Weather Forecast (ECMWF) and JRA25 compiled by Japan Meteological Agency. As a result, increase in evapotranspiration (Et) estimated as a residual between moisture convergence and precipitation is found at the semi-arid regions of China, Central Asia, Turkey and India etc, where the progress of desertification is reported. For some of these regions, these facts derived from the reanalysis and precipitation are consistent with the local reports that agricultural water use (irrigation by using river water, ground water, dam water) has been increased.

借助再分析数据集，可以明确25-50年大气水文预算的变化，并可以确定农业用水增加引起的蒸散量（Et）的增加。利用气象再分析数据和 APHRODITE 项目开发的基于雨量计的网格降水数据集（Yatagai 等，2009）对亚洲水文预算的年际变化进行了分析，其中使用了通过全球电信系统（GTS）网络提供的超过 4 倍的雨量计数据，并考虑了地形降水。在再分析方面，我们使用了欧洲中期天气预报中心（ECMWF）编制的ERA40数据和日本气象厅编制的JRA25数据。结果，在中国、中亚、土耳其和印度等半干旱地区，据报道荒漠化的进展，蒸散量（Et）增加，估计为水分汇聚和降水之间的残差。对于其中一些地区，从再分析和降水得出的这些事实与当地报告一致，即农业用水（使用河水、地下水、大坝水进行灌溉）有所增加。