北極海冰年際變化對(duì)東亞中緯度夏季陸面熱力異常的指示作用及其可能原因

doi:10.3969/2018jms.0045

首頁(yè) > 過(guò)刊瀏覽>2019年第39卷第4期 >427-436. DOI:10.3969/2018jms.0045

北極海冰年際變化對(duì)東亞中緯度夏季陸面熱力異常的指示作用及其可能原因
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                        10.3969/2018jms.0045
                    
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中圖分類號(hào):P461.2
基金項(xiàng)目:國(guó)家自然科學(xué)基金杰出青年資助項(xiàng)目（41625019）

Indicative role of interannual variations of Arctic sea ice on summer land surface thermal anomalies in the mid-latitude of East Asia and its possible cause

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本文分析了夏季東亞中緯度近地面溫度和春、夏北極海冰時(shí)空變化特征，探討了格陵蘭海、巴倫支海海冰異常變化與夏季東亞中緯度陸面熱力異常在年際上的可能聯(lián)系。結(jié)果表明：（1）1950-2014年，東亞中緯度夏季近地面溫度明顯增暖，并伴有明顯的年際變化，年際變率最大值的區(qū)域主要位于40°N以北至貝加爾湖地區(qū)；春、夏格陵蘭海和巴倫支海的海冰也呈現(xiàn)明顯的減少趨勢(shì)，同時(shí)表現(xiàn)出較強(qiáng)的年際變化特征。（2）春、夏格陵蘭海、巴倫支海海冰異常對(duì)東亞中緯度夏季陸面熱力異常具有一定的指示作用：春、夏格陵蘭海、巴倫支海海冰異常偏多，通常對(duì)應(yīng)夏季東亞中緯度近地面的東亞中緯度夏季增暖現(xiàn)象；反之亦然。（3）春、季格陵蘭海、巴倫支海北極海冰指數(shù)（Arctic Sea Ice Index，ASⅡ）高值年（海冰異常偏多年份），貝加爾湖及西南的蒙古高原地區(qū)通常為大范圍的異常高壓控制，有利于近地面溫度升高；同時(shí)由于烏拉爾山阻塞高壓減弱，極地南下的冷空氣減弱，有利于東亞中緯度區(qū)域的溫度升高。而ASⅡ低值年的情形則相反，貝加爾湖以南地區(qū)受異常低壓控制，烏拉爾山阻塞高壓增強(qiáng)，冷空氣易向南侵襲，不利于東亞中緯度近地面升溫。

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This paper first analyzes the temporal and spatial variation characteristics of the summer near-surface temperature in the mid-latitude of East Asia and the sea ice in the Arctic in spring and summer, and further discusses the possible interannual relationship between the sea ice anomaly changes in the Greenland Sea and Barents Sea and the summer land surface thermal anomaly in the mid-latitude of East Asia. Then the possible linkages between the interannual variations of spring and summer Arctic sea ice and summer land surface thermal anomalies have been explored. Results suggest that the land surface in the middle latitude of East Asia has experienced significant warming during 1950 to 2014, which was also accompanied by strong interannual variability especially in the south of the Lake Baikal. Meanwhile, both spring and summer Arctic sea ice decreased evidently and exhibits evident interannual difference, especially in the Greenland Sea and the Barents Sea. The spring and summer sea ice over those regions shows close relationship with the summer land surface thermal anomalies over East Asia. More (less) sea ice usually corresponds evident summer warming (cooling) in the middle latitude of the East Asia. Further analysis shows that more (less) sea ice tends to cause positive (negative) geopotential height anomalies in the south of the Lake Baikal and weakened (strengthened) blocking high near the Ural Mountain and weaker (stronger) cold air activity, which benefits the warming (cooling) of the middle latitude of the East Asia.

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吳磊,陳海山,周洋.北極海冰年際變化對(duì)東亞中緯度夏季陸面熱力異常的指示作用及其可能原因.氣象科學(xué),2019,39(4):427-436 WU Lei, CHEN Haishan, ZHOU Yang. Indicative role of interannual variations of Arctic sea ice on summer land surface thermal anomalies in the mid-latitude of East Asia and its possible cause. Journal of the Meteorological Sciences,2019,39(4):427-436

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收稿日期:2018-04-07
最后修改日期:2018-04-10
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在線發(fā)布日期: 2019-08-31
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