| 巴芬湾西部和格陵兰岛东部大气经向热量输送协同变化对夏季北极海冰的影响 |
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| 引用本文： | 王乐,张录军,杨文发.巴芬湾西部和格陵兰岛东部大气经向热量输送协同变化对夏季北极海冰的影响[J].海洋学报(英文版),2020,39(8):14-23. |
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| 作者姓名： | 王乐 张录军 杨文发 |
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| 作者单位： | 长江水利委员会水文局, 武汉, 430010;南京大学大气科学学院, 南京, 210023 |
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| 基金项目： | The National Key Research and Development Program of China under contract Nos 2016YFC0402708, 2017YFC1502501, 2018YFC1508002 and 2016YFA0602102; the China Special Fund for Meteorological Research in the Public Interest under contract No. GYHY201506011; the National Natural Science Foundation of China under contract Nos 41975134 and 40975040. |
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| 摘 要： | 利用欧洲中心气候再分析资料和美国国家冰雪数据中心北极海冰面积资料，分析了夏季北极海冰面积与前期大气经向热量输送年际变化的联系。结果表明：6月北半球中高纬大气的经向热量输送以瞬变热量形式为主，其中巴芬湾西部（B区）和格陵兰岛东部（G区）是瞬变热量向极区传输的两个通道，二者之间存在反位相的协同变化，且这种协同变化与夏季北极海冰面积变化密切相关。可能的机制为：6月，AD、AO和NAO三种北极大气环流型能够引起巴芬湾西部和格陵兰岛东部瞬变热量输送的协同变化，这种协同变化通过涡旋动力作用激发夏季极区大气表现为AD异常，同时影响途经区域的气温，从而通过热动力作用影响夏季北极海冰。将向极区输送的热量称为暖输送，从极区输出的热量为冷输送，则上述两个区域的瞬变热量协同输送可分为三种情况：B暖G冷、B冷G暖、B和G均冷，而B和G均暖的情况十分罕见。当B区向极区输入、G区输出热量时，有利于太平洋扇区和喀拉海的海冰偏少；当G区输入、B区输出热量时，利于喀拉海和拉普捷夫海海冰偏少；当B区和G区均输出热量时，利于波佛特海南部、喀拉海和拉普捷夫海海冰偏多，反之则相反。
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| 关 键 词： | 北极 大气经向热量输送 涡旋 海冰 北极偶极子 |
| 收稿时间： | 2020/2/1 0:00:00 |
The impact of concurrent variation of atmospheric meridional heat transport in western Baffen Bay and eastern Greenland on summer Arctic sea ice |
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| Wang Le,Zhang Lujun,Yang Wenfa.The impact of concurrent variation of atmospheric meridional heat transport in western Baffen Bay and eastern Greenland on summer Arctic sea ice[J].Acta Oceanologica Sinica,2020,39(8):14-23. |
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| Authors: | Wang Le Zhang Lujun Yang Wenfa |
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| Institution: | 1.Hydrology Bureau, Yangtze River Water Resources Commission, Wuhan 430010, China2.School of Atmospheric Science, Nanjing University, Nanjing 210023, China |
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| Abstract: | Based on the climatological reanalysis data of the European Center for Medium-Range Weather Forecasts and the Arctic sea ice data of the National Snow and Ice Data Center, the relationship between the Arctic sea ice area (SIA) and the interannual variation of atmospheric meridional heat transport (AMHT) was analyzed. The results show that the atmospheric meridional heat transported by transient eddy (TAMHT) dominates the June AMHT in mid-high latitudes of the Northern Hemisphere, while the western Baffin Bay (B) and the eastern Greenland (G) are two gates for TAMHT entering the Arctic. TAMHT in the western Baffin Bay (B-TAMHT) and eastern Greenland (G-TAMHT) has a concurrent variation of reverse phase, which is closely related to the summer Arctic SIA. Possible mechanism is that the three Arctic atmospheric circulation patterns (AD, AO and NAO) in June can cause the concurrent variation of TAMHT in the B and G regions. This concurrent variation helps to maintain AD anomaly in summer through wave action and changes the polar air temperature, thus affecting the summer Arctic SIA. Calling the heat entering the Arctic as warm transport and the heat leaving Arctic as cold transport, then the results are classified into three situations based on B-TAMHT and G-TAMHT: warm B corresponding to cold G (WC), cold B corresponding to warm G (CW), cold B corresponding to cold G (CC), while warm B corresponding to warm G is virtually non-existent. During the WC situation, the SIA in the Pacific Arctic sediments and Kara Sea decreases; during the CW situation, the SIA in the Laptev Sea and Kara Sea decreases; during the CC situation, the SIA in the Kara Sea, Laptev Sea and southern Beaufort Sea increases. |
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| Keywords: | Arctic atmospheric meridional heat transport transient eddy sea ice Arctic dipole |
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