14A.6 Role of Radiatively Forced Temperature Changes in Enhanced Semi-Arid Warming over East Asia

Thursday, 14 January 2016: 4:45 PM
La Nouvelle A ( New Orleans Ernest N. Morial Convention Center)
Xiaodan Guan, College of Atmospheric Sciences, Lanzhou University, Lanzhou, China; and J. Huang and R. guo

East Asia as a typical area that experienced greatly anthropogenic influence exhibited an obvious warming in the past decades since about 1970s. In this study, we investigate surface temperature change over East Asia using a recently developed methodology that can successfully identify and separate the dynamically induced temperature (DIT) and radiatively forced temperature (RFT) changes in raw surface air temperature (SAT) data. For regional averages, DIT and RFT make 43% and 56% contributions to the SAT, respectively. The DIT changes dominate the SAT decadal variability and are mainly determined by internal climate variability. The radiatively forced SAT changes made major contribution to the global-scale warming trend and the regional-scale enhanced semi-arid warming (ESAW). The regional anthropogenic radiative forcing caused the enhanced warming in the semi-arid region, which may be closely associated with local human activities. Therefore, further investigation should be focus on the quality of different human activities, such as wind farm, agricultural mulch and so on.
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