| 北极海冰与大气环流耦合主模态的时空特征分析 |
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| 引用本文： | 张涛,刘喜迎,胡晓明.北极海冰与大气环流耦合主模态的时空特征分析[J].极地研究,2013,25(3):226-233. |
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| 作者姓名： | 张涛 刘喜迎 胡晓明 |
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| 作者单位： | 1.解放军理工大学气象海洋学院，江苏 南京211101；
;2.中国海洋大学海洋环境学院，山东青岛 266100 |
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| 基金项目： | 国家自然科学基金“行星冲击产生的高温高压相变反应：月球火星陨石中后成合晶的研究” |
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| 摘 要： | 对1979—2009年月平均的CFSR（The Climate Forecast System Reanalysis）海冰密集度（SIC）和海平面气压（SLP）资料进行多变量经验正交函数分解（MV—EOF），得出耦合主模态，并通过对温度、位势高度和风场的回归分析，进一步探寻海冰与大气环流的关系，第一模态SLP的特征为北极涛动（AO），SIC呈离散的正负中心分布但大体为东西反位相，AO正位相时，喀拉海、拉普捷夫海、东西伯利亚海和鄂霍次克海海冰减少，巴芬湾、波弗特海、楚科奇海和白令海海冰增加。耦合第二模态的SLP呈偶极子分布，负、正异常中心在巴伦支海和波弗特海，SIC在巴伦支海，弗拉姆海峡，格陵兰海，拉布拉多海和白令海，鄂霍次克海地区有正异常，在喀拉海、拉普捷夫海、东西伯利亚海、楚科齐海和波弗特海为负异常。耦合第三模态SLP在冰岛地区存在负异常中心，在拉普捷夫海地区有正异常中心，SIC在巴伦支海北部、弗拉姆海峡、格陵兰海为负异常，其余地区全为正异常。
对SLP和SIC分别进行EOF分解，并与耦合模态进行比较，SLP的EOF主模态的时空分布与耦合模态中SLP的时空分布十分相似，SIC的EOF模态的时空分布则与耦合模态中SIC的时空分布有较大差别，说明耦合模态对SIC的分布影响较大，即大气环流对海冰分布的影响为主要的过程，海冰对大尺度的大气环流的模态的影响不明显。
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| 关 键 词： | 北极海冰 海平面气压 MV—EOF 北极涛动 |
| 收稿时间： | 2012-12-14 |
THE MAIN MODES OF ARCTIC SEA ICE AND ATMOSPHERIC CIRCULATION |
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| Zhang Tao,Liu Xiying,Hu Xiaoming.THE MAIN MODES OF ARCTIC SEA ICE AND ATMOSPHERIC CIRCULATION[J].Chinese Journal of Polar Research,2013,25(3):226-233. |
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| Authors: | Zhang Tao Liu Xiying Hu Xiaoming |
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| Abstract: | Thirty-oneyears ofmonthly mean CFSR(The Climate Forecast System Reanalysis) SIC (sea ice concentration) and SLP (sea level pressure) data and multivariate experience orthogonal function (MV-EOF) analysis are used to document the coupled main modes of sea ice and atmospheric circulation, And the temperature, geopotential height and wind field in regression analysis to further explore the relationship between sea ice and atmospheric circulation. The first mode of SLP resembles the structure of AO (Arctic oscillation), and the SIC show a dipolar structure between the American part and the Eurasia part of Arctic. When AO in its positive phase, there is negative sea ice anomaly in kara Sea, Laptev Sea, East Siberian Sea and Sea of Okhotsk, and positive sea ice anomaly in Baffin Bay, Beaufort Sea, Chukchi Sea and Bering Sea. And the polar vortex at 500pha, meridional circulation and jet stream at 200hpa are enhanced, on the contrary, when AO in is negative phase, the west Arctic sea ice increase and the east Arctic sea ice decrease, and the polar vortex at 500hpa, meridional circulation and jet stream and 200hpa are weakened. The second mode indicates the long-term trend of sea ice and atmospheric circulation. And in 90’s there was a abrupt change, after this time, the sea ice Continuing decline, SLP depress. 500hpa East Asian trough weakened North American trough increase. The third mode of SLP is a dipolar structure and sea ice has seesaw structure between Barents Sea, GIN (Greenland-Iceland-Norwegian) sea, Fram Strait and Laptev Sea, East Siberian Sea, Beaufort Sea and sea of Okhotsk. The main coupled period of sea ice and atmospheric is a interdecadal period about 10 to 20 years. And AO mostly influence the sea ice though dynamics, but the dipolar has both dynamic and thermodynamic influence on sea ice. |
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| Keywords: | Arctic sea ice SLP MV-EOF AO |
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