Evaluating the impacts of land use and land cover changes on surface air temperature using the WRF-mosaic approach  

作　　者：ZHAO De-Ming WU Jian 

机构地区：[1]CAs Key Laboratory of Regional Climate-Environment for Temperate East Asia,Institute of Atmospheric Physics,Chinese Academy of Sciences [2]Department of Atmospheric Science,Yunnan University

出　　处：《Atmospheric and Oceanic Science Letters》2018年第3期262-269,共8页大气和海洋科学快报（英文版）

基　　金：supported by the National Natural Science Foun-dation of China[grant numbers 41775087 and 41675149];the National Key R&D Program of China[grant number 2016YFA0600403];the Chinese Academy of Sciences Strategic Priority Program[grant number XDA05090206];the National Key Basic Research Program on Global Change[grant number 2011CB952003];the Jiangsu Collaborative Innovation Center for Climatic Change

摘　　要：Satellite-derived land surface data in 1980 and 2010 were used to represent land use and land cover（LULC） changes caused by the rapid economic development and human activities that have occurred over the past few decades in East Asia and China. The effects of LULC changes on the radiation budget and 2-m surface air temperature（SAT） were explored for the period using the Weather Research and Forecasting（WRF） model. The mosaic approach, which considers the N-most abundant land use types within a model grid cell（here, N = 3） and precisely describes the subgridscale LULC changes, was adopted in the integrations. The impacts of LULC changes based on two 36-year integrations showed that SAT generally decreased, with the sole exception being over eastern China, resulting in decreased SAT in China（-0.062 °C） and East Asian land areas（EAL,-0.061 °C）. The LULC changes induced changes in albedo, which influenced the radiation budget. The radiative forcings at the top of the atmosphere were-0.56 W m-2 across the whole of China, and-0.50 W m-2 over EAL. Meanwhile, the altered roughness length mainly influenced near-surface wind speeds, large-scale and upward moisture fluxes, latent heat fluxes, and cloud fractions at different altitudes. Though the impacts caused by the LULC changes were generally smaller at regional scales, the values at local scales were much stronger.如何量化土地利用/覆盖变化(LUCC)对区域气候的影响,是人类活动影响气候变化研究中的一个难点。本文利用卫星遥感反映过去三十年东亚区域土地利用变化数据,基于Mosaic近似考虑土地利用及其变化次网格尺度过程,量化了LUCC对地表辐射收支及气温的影响。过去三十年土地利用/覆盖变化对东亚区域总体呈降温效应(中国东部地区增温效应),LUCC导致的地表反照率变化影响地表辐射收支,中国和东亚区域的辐射强迫分别为-0.56 W m^(-2)和-0.50 W m^(-2)。

关 键 词：Land use and land cover change surface airtemperature ALBEDO radiation budget numerical simulation 

分 类 号：P467[天文地球—大气科学及气象学]