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Natural interdecadal weakening of east asian summer monsoon in the late 2.th century

Science Bulletin 2005年第17期 109-115页

作者： JIANG Dabang1, 2.& WANG Huijun1 1. Nansen-Zhu International Research Center, Institute of Atmospheric Physics, chinese academy of sciences, beijing 100029,{2. 2. key laboratory of regional climate-environment Research for tem-perate east {13., chinese academy of sciences, beijing 100029,{2.

Based on the reanalysis data throughout 1948―2.02.as derived from the United States National Centers for environmental Prediction and National Center for Atmos-pheric Research, it is revealed that {3. {2.n summer mon-soon (EASM) intensity weakens on an interdecadal timescale since the mid-1960s, and twice interdecadal jumps are re-corded in the EASM intensity index series in the late 2.th century, respectively occurring in the mid-1960s and mid- to late 1970s. Six globally coupled atmosphere-ocean models’ outputs under the SRES A2.greenhouse gas and aerosol emission scenario, provided by the IPCC Data Distribution Center and the Hadley Center for climate Prediction and Research, are then systematically examined. It follows that the above EASM weakening is not closely related to synchro-nizing anthropogenic global warming, and, therefore, it should be qualitatively natural change process. Over the 2.st century, the EASM intensity is likely increased slightly by continually intensified greenhouse effect relative to the late 2.th century.

关键词： east asian summer monsoon interdecadal weakening global warming natural change.

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Numerical modeling of geothermal groundwater flow in karst aquifer system in eastern Weibei,Shaanxi Province,{2.

Numerical modeling of geothermal groundwater flow in karst a...

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中国科学院地质与地球物理研究所2.07学术年会

作者： LI Ming~(1+),LI GuoMin~1,YANG Liao~2.DANG XueYa~3.ZHAO ChunHu~1,HOU GuangCai~3.& ZHANG MaoSheng~3.1 State key laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,{2. academy of sciences,beijing 100029,china 2.Xinjiang Institute of Ecology and Geography,{2. academy of sciences,(U|¨)r(u|¨)mqi 83.011,china 3.Xi’an Institute of Geology and Mineral Resources,Xi’an 710054,china

The quantitative assessment of geothermal water resources is important to the exploitation and utilization of geothermal *** the geothermal water systems the density of groundwater changes with the temperature,therefore the variations in hydraulic heads and temperatures are very complicated. A three-dimensional density-dependent model coupling the groundwater flow and heat transport is established and used to simulate the geothermal water flow in the karst aquifers in {3.ern Weibei, Shaanxi Province,*** multilayered karst aquifer system in the study area is cut by some major faults which control the regional groundwater *** order to calibrate and simulate the effect of the major faults,each fault is discretized as a belt of elements with special hydrological parameters in the numerical *** groundwater dating data are used to be integrated with the groundwater flow pattern and calibrate the *** results show that the calculated hydraulic heads and tem- perature fit with the observed data well.

关键词： geothermal water numerical modeling fault karst aquifer system Weibei of Shaanxi Province

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