Connection between winter Arctic sea ice and west Tibetan Plateau snow depth through the NAO,International Journal of Climatology

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Connection between winter Arctic sea ice and west Tibetan Plateau snow depth through the NAO
International Journal of Climatology ( IF 3.5 ) Pub Date : 2020-05-25 , DOI: 10.1002/joc.6676
Yuhang Chen _{1,

2} , Anmin Duan _{1,

2} , Dongliang Li ₁

Affiliation

The relationship between changes in Arctic sea ice and the mid‐latitude climate has been receiving increasing attention. As the highest and largest topography in Asia, the possible link between the west Tibetan Plateau snow depth (WTPSD) and the Arctic sea ice was investigated based on observational data and model simulations. The results indicate that a consistent variation between the WTPSD and the seesaw sea ice pattern in the Barents‐Nordic Sea and Labrador Sea (BLSIC) exists during boreal winter, and both the WTPSD and BLSIC are negatively correlated with the North Atlantic Oscillation (NAO) index. During the negative phases of the NAO, an anomalous Rossby wave train propagates from the North Atlantic to the north of the Arabian Sea, inducing cyclonic anomalies in the mid‐troposphere and enhancing water vapour transportation onto the TP, which is conducive to in situ snow accumulation. Furthermore, composite analysis and AGCM numerical experiments demonstrate that such an anomalous BLSIC pattern can in turn reinforce the negative phase of the NAO in strength, facilitating the propagation of the mid‐tropospheric Rossby waves to north of the Arabian Sea and hence an above normal WTPSD. Therefore, the variation in WTPSD is influenced by the direct effect of the NAO and additional feedback from BLSIC, which hints a potential cryospheric connection between the TP and the Arctic.

中文翻译：

通过NAO冬季北极海冰与青藏高原西部积雪之间的联系

北极海冰变化与中纬度气候之间的关系日益受到关注。作为亚洲最高和最大的地形，根据观测数据和模型模拟，研究了青藏高原西部雪深（WTPSD）与北极海冰之间的可能联系。结果表明，在寒冬期间，巴伦支-北欧海和拉布拉多海（BLSIC）中的WTPSD与跷跷板海冰模式之间存在一致的变化，并且WTPSD和BLSIC与北大西洋涛动（NAO）均呈负相关。指数。在NAO的负相期间，异常的Rossby波列从北大西洋传播到阿拉伯海的北部，在对流层中层引起气旋异常并增强了水蒸气向TP的传输，这有利于原地积雪。此外，复合分析和AGCM数值实验表明，这种异常的BLSIC模式可以反过来增强NAO的负相强度，促进对流层Rossby波向阿拉伯海北部的传播，从而使WTPSD高于正常值。因此，WTPSD的变化受到NAO的直接影响和BLSIC的额外反馈的影响，这暗示着TP和北极之间可能存在冰冻圈联系。促进了对流层中的罗斯比波向阿拉伯海以北的传播，从而使WTPSD高于正常值。因此，WTPSD的变化受到NAO的直接影响和BLSIC的额外反馈的影响，这暗示着TP和北极之间可能存在冰冻圈联系。促进了对流层中的罗斯比波向阿拉伯海以北的传播，从而使WTPSD高于正常值。因此，WTPSD的变化受到NAO的直接影响和BLSIC的额外反馈的影响，这暗示着TP和北极之间可能存在冰冻圈联系。

更新日期：2020-05-25

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