| Project/Area Number |
19540467
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Research Institute for Humanity and Nature |
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Principal Investigator |
YATAGAI Akiyo Research Institute for Humanity and Nature, 研究部, 助教 (60353447)
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| Project Period (FY) |
2007 – 2009
|
| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2009: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 気候変動 / 水循環 / 環境変動 / 大気現象 / 水資源 |
|---|
| Research Abstract |
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.
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