The Influence of Sudden Arctic Sea-Ice Thinning on North Atlantic Oscillation Events

IF 1.6 4区地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmosphere-Ocean Pub Date : 2021-01-01 DOI:10.1080/07055900.2021.1875976

G. Dai, M. Mu, Lei Wang

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引用次数: 8

Abstract

ABSTRACT Utilizing the Community Atmosphere Model, version 4 (CAM4), the influence of sudden Arctic sea-ice thinning on North Atlantic Oscillation (NAO) events is investigated on a sub-seasonal time scale. First, the control simulation with CAM4 using prescribed daily boundary conditions produces realistic descriptions for the frequency and evolution of NAO events. Second, sensitivity experiments are then conducted to investigate the impact of sudden Arctic sea-ice thinning on NAO events. Numerical results show that the NAO has obvious responses to sudden sea-ice thinning over 10 days. Finally, the NAO responses to sudden sea-ice thinning are related to the positions of the NAO event. Further diagnostic analysis reveals that when the poleward centre of a positive NAO event is located west (east) of Greenland, cold (warm) advection would be induced because of the sudden sea-ice thinning along with the northward (southward) wind. This cooling (warming) causes the air to contract (expand) and further results in a decrease (increase) in the geopotential height and sea level pressure fields, which corresponds to a positive NAO (negative NAO) response. The results of this investigation show that the response of atmospheric circulation to boundary conditions is determined by both boundary condition changes and the atmospheric circulation regime, which provides an understanding of the effect on an NAO event of sudden sea-ice thinning on a sub-seasonal time scale.

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北极海冰突然变薄对北大西洋涛动事件的影响

利用群落大气模式第4版(CAM4)，在亚季节时间尺度上研究了北极海冰突然变薄对北大西洋涛动(NAO)事件的影响。首先，使用CAM4的控制模拟使用规定的日边界条件产生了NAO事件的频率和演变的真实描述。其次，利用敏感性实验研究了北极海冰突然变薄对NAO事件的影响。数值结果表明，NAO对10 d海冰突然变薄有明显的响应。最后，NAO对海冰突然变薄的响应与NAO事件发生的位置有关。进一步的诊断分析表明，当一个正的NAO事件的极向中心位于格陵兰岛的西(东)时，由于海冰的突然变薄以及北(南)风，将会诱发冷(暖)平流。这种冷却(变暖)导致空气收缩(膨胀)，并进一步导致位势高度和海平面压力场的减少(增加)，这对应于正的NAO(负的NAO)响应。研究结果表明，大气环流对边界条件的响应是由边界条件变化和大气环流状态共同决定的，这为在亚季节时间尺度上理解NAO事件对海冰突然变薄的影响提供了依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Atmosphere-Ocean 地学-海洋学

CiteScore

2.50

自引率

16.70%

发文量

审稿时长

>12 weeks

期刊介绍： Atmosphere-Ocean is the principal scientific journal of the Canadian Meteorological and Oceanographic Society (CMOS). It contains results of original research, survey articles, notes and comments on published papers in all fields of the atmospheric, oceanographic and hydrological sciences. Arctic, coastal and mid- to high-latitude regions are areas of particular interest. Applied or fundamental research contributions in English or French on the following topics are welcomed: climate and climatology; observation technology, remote sensing; forecasting, modelling, numerical methods; physics, dynamics, chemistry, biogeochemistry; boundary layers, pollution, aerosols; circulation, cloud physics, hydrology, air-sea interactions; waves, ice, energy exchange and related environmental topics.