Simulations of water resource environmental changes in China during the last 20 000 years by a regional climate model |
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| Authors: | YQ Zheng ZC Qian HR He HP Liu XM Zeng G Yu |
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| Institution: | aInstitute of Meteorology, PLA University of Sciences and Technology, Nanjing 211101, China;bNanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;cDepartment of Physics, Atmos. Sci. and General Sci., Jackson State University, Jackson, MS 39217, USA |
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| Abstract: | We utilize a regional climate model with detailed land surface processes (RegCM2) to simulate East Asian monsoon climates at 0 ka, 6 ka and 21 ka BP, and evaluate the changes in hydrology process, including vapor transportation, precipitation, evapotranspiration and runoff in the eastern and western China during these periods. Results indicate that the Tibetan Plateau climate presents a wet–cold status during the LGM while it exhibits a wet–warm climate at 6 ka BP. The LGM wetter climate over the Tibetan Plateau mainly results from the increased vapor inflow through its south boundary, while the increase in the vapor import over the Tibetan Plateau at 6 ka BP mostly sources from its west boundary. The increase in the LGM runoff over the Tibetan Plateau is mainly caused by the decrease in evapotranspiration, while the increase in runoff at the 6 ka BP mainly by the enhanced precipitation. Eastern China (including southern China) presents a dry status during the LGM, which precipitation and runoff decreases significantly due largely to weakened Asian summer monsoon that results in the decreased vapor inflow through the south boundary of eastern China. The variation pattern in the hydrological cycle in eastern China is contrary to that in western China during the LGM. The increase in precipitation and runoff at 6 ka BP in eastern China is tightly related to the strong Asian summer monsoon that leads to increased vapor import through the south boundary. Long term decrease trend in precipitation and runoff in northern China since the last 20 000 years may be attributed to the steady increase in vapor export through the east boundary as a result of the changes of East Asian monsoon and the adjustments of local atmospheric circulations in this area. |
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| Keywords: | simulation water resource change East Asian regional climate model LGM mid-Holocene |
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