Impact of land surface degradation in northern China and southern Mongolia on regional climate  

作　　者：ZHANGJingyong DONGwenjie Congbin 

机构地区：[1]START/TEA,InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijing100029,China//GraduateSchooloftheChineseAcademyofSciences,Beijing100039,China [2]NationalClimateCenter,Beijing100081,China [3]START/TEA,InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijing100029,China

出　　处：《Chinese Science Bulletin》2005年第1期75-81,共7页

基　　金：the Innovation Project of the Chinese Academy of Sciences(Grant No.ZKCX2-sw-210);the National Key Program for Developing Basic Sciences(Grant No.G199904308); the National Natural Science Foundation of China(Grant No.40231006).

摘　　要：Clear evidence provided by the singular value decomposition (SVD) analysis to the normalized difference vegetation index (NDVI) and precipitation data identifies that there exists a sensitive region of vegetation-climate in- teraction located in the transitional zone over northern China and its surrounding areas, where the vegetation cover change has the most significant influence on summer pre- cipitation over China. Comparison of reanalysis data with station data provides a good method to assess the impacts of land use change on surface temperature, and the most obvi- ous contribution of land use change may be to lead to notable warming over northern China in the interdecadal time scale. Based on the new statistical results, a high-resolution re- gional integrated environmental model system (RIEMS) is employed to investigate the effects of land surface degrada- tion over the transitional zone and its surrounding areas (northern China and southern Mongolia) on the regional climate. Land degradation results in the decreases in pre- cipitation over northern and southern China, and the in- crease in between, and increased and decreased temperature over vegetation change areas and the adjacent area to the south, respectively. Not only would it change the surface cli- mate, but also bring the significant influence on the atmos- pheric circulation. Both the surface climate and circulation changes generally agree to the observed interdecadal anoma- lies over the last five decades. These integrated statistical and simulated results imply that land surface degradation over the transitional zone in northern China and its surrounding areas could be one of the main causes responsible for the climate anomalies over China, especially the drought over northern China.Clear evidence provided by the singular value decomposition (SVD) analysis to the normalized difference vegetation index (NDVI) and precipitation data identifies that there exists a sensitive region of vegetation-climate interaction located in the transitional zone over northern China and its surrounding areas, where the vegetation cover change has the most significant influence on summer precipitation over China., Comparison of reanalysis data with station data provides a good method to assess the impacts of land use change on surface temperature, and the most obvious contribution of land use change may be to lead to notable warming over northern China in the interdecadal time scale. Based on the new statistical results, a high-resolution regional integrated environmental model system (RIEMS) is employed to investigate the effects of land surface degradation over the transitional zone and its surrounding areas (northern China and southern Mongolia) on the regional climate. Land degradation results in the decreases in precipitation over northern and southern China, and the increase in between, and increased and decreased temperature over vegetation change areas and the adjacent area to the south, respectively. Not only would it change the surface climate, but also bring the significant influence on the atmospheric circulation. Both the surface climate and circulation changes generally agree to the observed interdecadal anomalies over the last five decades. These integrated statistical and simulated results imply that land surface degradation over the transitional zone in northern China and its surrounding areas could be one of the main causes responsible for the climate anomalies over China, especially the drought over northern China.

关 键 词：地表退化 中国北部地区 蒙古南部地区 区域性气候 奇异值分解 地表环境 

分 类 号：P56[天文地球—构造地质学] X14[天文地球—地质学]