1. 半干旱气候变化教育部重点实验室,兰州大学,甘肃兰州 730000
• 收稿日期:2013-03-14 出版日期:2013-11-10
• 通讯作者: 刘玉芝(1979-),女,新疆奇台人,副教授,主要从事大气辐射及气候变化研究. E-mail: liuyzh@lzu.edu.cn E-mail:liuyzh@lzu.edu.cn
• 基金资助:
国家重大科学研究计划项目“全球典型干旱半干旱地区气候变化及其影响”(编号：2012CB955301); 中央高校基本科研业务费专项资金科研创新团队培育项目“西北地区半干旱气候变化机理研究”(编号：lzujbky-2013-ct05)资助.

### Impact of the Ice-albedo Feedback on Meridional Temperature Gradient of Northern Hemisphere

Xie Yongkun, Liu Yuzhi, Huang Jianping, Wang Guoyin

1. Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
• Received:2013-03-14 Online:2013-11-10 Published:2013-11-10

This paper analyzes the variation of meridional temperature gradient (MTG) over mid-latitude and high-latitude of Northern Hemisphere continents during last 100 years using observational data. It is found that MTG over high-latitude of Northern Hemisphere continents has an increasing trend, but the simulation results of CMIP5 models show a decreasing trend. Results of this study showed the decrease of MTG over the high-latitude continents of Northern Hemisphere calculated by CMIP5 historical simulations mainly because the models of CMIP5 exaggerated ice-albedo feedback over high-latitude regions. A series of simulation results by energy balance climate models showed that ice-albedo feedback amplified the magnitude of warming in the global warming induced only by carbon dioxide, and the magnitude of warming in highlatitude was much larger than that in low-latitude regions. Along with global warming, ice-albedo feedback has little influence on MTG in low-latitude, but can induce the decrease of MTG in high-latitude regions.
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