| 欧亚大陆中高纬积雪消融异常对东北夏季低温的影响 |
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| 引用本文： | 陈海山,齐铎,许蓓.欧亚大陆中高纬积雪消融异常对东北夏季低温的影响[J].大气科学,2013,37(6):1337-1347. |
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| 作者姓名： | 陈海山 齐铎 许蓓 |
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| 作者单位： | 南京信息工程大学气象灾害教育部重点实验室, 南京 210044;南京信息工程大学大气科学学院, 南京 210044 |
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| 基金项目： | 国家自然科学基金资助项目41075082、41230422;科技部公益性行业(气象)科研专项GYHY201206017;江苏省"333高层次人才培养工程"、"青蓝工程"和江苏高校优势学科建设工程资助项目(PAPD)资助 |
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| 摘 要： | 利用美国冰雪资料中心提供的1979~2007年月平均积雪水当量资料、NCEP/NCAR的逐月再分析资料 以及中国743站的逐日气温资料,讨论了欧亚中高纬春季融雪异常分布与中国东北夏季温度的联系及其可能的影响机理。结果表明:欧亚大陆中高纬西部春季融雪偏多、东部春季融雪偏少时,我国东北夏季易出现低温。春季东部融雪量少,导致夏季剩余积雪偏多;夏季积雪融化吸热增多,加上后期的土壤湿度增加会导致该地区夏季温度异常偏低,高度场下降,500 hPa上欧亚中高纬东部的长波槽加深,槽后偏北气流加强;来自极地的冷空气容易入侵东亚中高纬地区,引起我国东北夏季低温。
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| 关 键 词： | 欧亚大陆中高纬 融雪异常 大气环流 东北夏季低温 |
| 收稿时间： | 2012/11/6 0:00:00 |
| 修稿时间： | 2/5/2013 12:00:00 AM |
Influence of snow melt anomaly over the mid-high latitudes of the Eurasian continent on summer low temperatures in northeastern China |
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| Chen Haishan,Qi Duo and Xu Bei.Influence of snow melt anomaly over the mid-high latitudes of the Eurasian continent on summer low temperatures in northeastern China[J].Chinese Journal of Atmospheric Sciences,2013,37(6):1337-1347. |
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| Authors: | Chen Haishan Qi Duo and Xu Bei |
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| Institution: | Key Laboratory of Meteorological Disaster (NUIST), Ministry of Education, Nanjing 210044;School of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044 |
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| Abstract: | The possible linkage of the spring snowmelt anomalies over the Eurasian continent and the summer temperature in northeastern China and its related physical mechanism were investigated on the basis of monthly snow water equivalent data during the period of 1979-2007 provided by the National Snow and Ice Data Center and the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data as well as the daily temperature observations over 743 stations in China. Results show that cold summers tend to occur when snowmelt in the Eurasian continent is greater in the west than that in the east. The decreases of the spring snowmelt amount in the eastern region will lead to more surplus snow in the following summer. More snowmelt accompanied with more absorption heat and increased soil moisture in summer result in lower temperatures as well as decreased geopotential height, which strengthens the long wave rough at 500 hPa and the northern wind behind the trough over eastern Eurasia. As a result, cold air flow from the polar region easily invades the mid-high latitudes of East Asia, eventually leading to low temperatures in summer over northeastern China. |
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| Keywords: | Mid-high latitudes of Eurasian continent Snowmelt anomaly Atmospheric general circulation Summer low temperature in northeastern China |
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