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The influence of winter and summer atmospheric circulation on the variability of temperature and sea ice around Greenland

机译:冬季和夏季大气环流对格陵兰岛周围温度和海冰变化的影响

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Most peripheral seas of the Arctic Ocean have seen a pronounced rise in sea surface temperatures in the past century, and this signature of Arctic amplification in proximity to the land suggests that the observed marine and terrestrial changes might be connected to each other. Using in situ observations of temperature from nine coastal meteorological stations around Greenland (GrSTs) and remotely sensed fields of sea ice extent (SIE), we examine the interannual variations of surface air temperature (T2m) and sea level pressure (SLP) anomalies associated with the GrSTs and SIEs surrounding Greenland, specifically within Baffin Bay, the Greenland Sea and Kara-Barents Seas. During winter, the interannual variation in T2m and SLP of the west and south coasts of GrSTs and the Baffin Bay SIE are different from that of the east coast of GrSTs and the SIEs in the Greenland Sea and Kara-Barents Seas. The GrSTs on the west and south coasts of Greenland and the Baffin Bay SIE are associated with the T2m anomalies over Baffin Bay and Davis Strait. The winter SLP patterns associated with these GrSTs and SIEs show positive anomalies over the Arctic and negative anomalies over the North Atlantic with a large-scale atmospheric circulation such as the winter NAO. On the contrary, the east coast of GrSTs and the SIEs in the Greenland Sea and Kara-Barents Seas are correlated with the T2m anomalies over the Greenland Sea and Barents Sea. The surface wind pattern associated with the SIEs in the Greenland Sea and Kara-Barents Seas has a cyclonic circulation in the Greenland Sea and Barents Sea. At the local scale the cyclonic circulation could induce negative SIE anomalies and contribute to increasing open water in the Greenland Sea and Barents Sea. The effect of the loss of sea ice and the heat from the open ocean warming to the atmosphere may influence the GrSTs in the east coast of Greenland. As a result, the T2m pattern associated with the GrSTs in the east coast of Greenland is similar to the pattern of the SIEs in the Greenland Sea and Kara-Barents Seas. During summer, the T2m anomalies associated with all GrSTs and SIEs have positive anomalies over mid-latitudes. The two times series of all GrSTs and SIEs fluctuate quickly and display large trends towards warming temperatures and decreasing SIE. The summer SLP associated with all GrSTs and SIEs are characterised by a seesaw pattern between positive anomalies over the Arctic and negative anomalies over mid-latitudes. The summer SLP anomalies are similar to the summer AO pattern, and it is noteworthy that the summer anticyclonic circulation over the Arctic and Greenland has contributed to the variability and trends in both summer GrSTs and SIEs.
机译:在过去的一个世纪中,北冰洋的大多数外围海域的海表温度均出现了明显上升,北极在陆地附近的这种放大迹象表明,观测到的海洋和陆地变化可能相互联系。利用对格陵兰岛附近的九个沿海气象站(GrSTs)和遥感海冰范围(SIE)的温度的原位观测,我们研究了与之相关的地表气温(T2m)和海平面压力(SLP)异常的年际变化。格陵兰岛周围的GrST和SIE,特别是在巴芬湾,格陵兰海和卡拉巴伦特海中。冬季,GrSTs西南部海岸和巴芬湾SIE的T2m和SLP的年际变化不同于格陵兰海和格陵兰海和Kara-Barents海的SIE的东海岸。格陵兰岛西海岸和南海岸的GrSTs和巴芬湾SIE与巴芬湾和戴维斯海峡的T2m异常有关。与这些GrST和SIE相关的冬季SLP模式在北极上表现出正异常,在北大西洋上空表现出负异常,并伴有大规模的大气环流,例如冬季NAO。相反,格陵兰海和格陵兰海和卡拉巴伦特海的东南沿海地区的东海岸与格陵兰海和巴伦特海的T2m异常有关。与格陵兰海和卡拉巴伦特海的SIE相关的地表风型在格陵兰海和巴伦特海具有气旋环流。在地方尺度上,气旋环流可引起负的SIE异常,并有助于增加格陵兰海和巴伦支海的开放水域。海冰的损失以及从公海变暖到大气的热量可能会影响格陵兰岛东海岸的GrST。结果,与格陵兰岛东海岸的GrSTs相关的T2m模式与格陵兰海和卡拉巴伦特海的SIE模式相似。在夏季,与所有GrST和SIE相关的T2m异常在中纬度地区都具有正异常。所有GrST和SIE的两个时间序列迅速波动,并显示出温度升高和SIE降低的大趋势。与所有GrST和SIE相关的夏季SLP的特征在于,北极上空的正异常与中纬度上的负异常之间存在跷跷板模式。夏季SLP异常与夏季AO模式相似,值得注意的是,夏季北极和格陵兰岛上的夏季反气旋环流对夏季GrST和SIE的变化和趋势都有贡献。

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