黄土高原地区土地覆盖变化对气候的反馈作用数值模拟

Abstract

Abstract: Land-cover change is driven by the natural climate change and human activities,in turn,the land-cover change also has impact on regional climate. The processes of land-cover change affected the regional climate through exchanges of materials(e.g.,water)and energy across the land-atmosphere interface,and the processes play an important role in regional ecological construction. In this paper,we conducted two numerical simulations (1980-2014,2005-2014)using Regional Climate model(RegCM)version 4.5,which are driven by ERA-Interim reanalysis data produced by the European Centre for Medium-Range Weather Forecasts(ECMWF). A set of land-cover data with high spatial resolution and timeliness had been built based on the 1:250 000 land-use data, the map of vegetation and the map of soil. Then the changes in temperature and precipitation that influenced by the actual land-cover changes were simulated with the land surface process model Biosphere-Atmosphere Transfer Scheme(BATS)in the Loess Plateau. The feedback of land-cover change and the surface energy budget were analyzed on regional climate. The implications are follows:(1)RegCM4.5 can reproduce the observed annual cycle of mean temperature and precipitation well,as well as the feedback of water-heat conditions under the land-cover change on the Loess Plateau.(2)Land-cover change has stronger impact on precipitation and temperature in summer. The feedback is different under different types of land-cover change.(3)Desertification can lead to increase of temperature and decrease of precipitation,which would hinder the natural vegetation recovery. (4)Reclamation will lead to increase of temperatures and precipitation in summer,which may cause more drought and flood events.(5)Grassland amplification will lead to decrease of temperature and precipitation in spring and summer and increase of temperatures and precipitation in autumn and winter. The conclusion can deepen the understanding of the effects of ecological environment change in loess plateau,and the process of reciprocal effects between land-use and climate change. The conclusion provides a reference for selection of regional ecological construction policy.

Key words: RegCM4.5, land-cover change, climate feedback, the Loess Plateau

CLC Number:

P461

GOU Jiao-jiao, WANG Fei, YU En-tao, JIN Kai. Numerical simulation of the feedback of land-cover change on regional climate in the Loess Plateau[J]., 2017, 40(4): 850-859.

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Numerical simulation of the feedback of land-cover change on regional climate in the Loess Plateau

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