Impacts of the extratropical North Pacific on boreal summer Arctic circulation

IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES Atmospheric and Oceanic Science Letters Pub Date : 2023-09-01 DOI:10.1016/j.aosl.2023.100405
Shengping He , Tore Furevik , Huijun Wang , Fei Li , Mingkeng Duan
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引用次数: 1

Abstract

A distinct characteristic of the Arctic summer atmospheric circulation is the anomalous anticyclonic circulation centered over the Arctic Ocean associated with significant Arctic warming. Previous studies have related the underlying mechanisms to the earlier spring Eurasian snowmelt and the tropical Pacific forcing. Here, the authors show that the Arctic summer anomalous anticyclonic circulation is significantly related to the extratropical North Pacific sea surface temperature anomalies (SSTAs) in spring, indicating a teleconnection from the extratropical North Pacific to the Arctic. The SSTA pattern is characterized by warm anomalies in the midlatitudes of the extratropical North Pacific surrounded by significant cold anomalies, resembling the negative phase of the Pacific Decadal Oscillation (PDO) but without significant signals in the tropics (referred to as the negative PDO-like pattern). This negative PDO-like pattern in May can stimulate a Rossby wave propagating from the Bering Sea to the Arctic and lead to an anomalous Arctic anticyclone which can be sustained during summer. Meanwhile, the negative PDO-like pattern can persist to summer and induce an anomalous surface low pressure over the Bering Sea in summer. This anomalous surface low causes anomalous rising motions and induces upper-level divergence anomalies which further intensify the summer Arctic anticyclone. The upper-level tropospheric Arctic anticyclone can force anomalous adiabatic descent over the Arctic and sub-Arctic, leading to significant adiabatic heating in the Arctic. As a result, a significant warming emerges over the Arctic with the center located in the middle troposphere. The connection between the negative PDO-like SSTAs and the summer Arctic anticyclone has been confirmed by numerical experiments.

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温带北太平洋对北极夏季北方环流的影响
北极夏季大气环流的一个显著特征是与北极显著变暖有关的以北冰洋为中心的异常反气旋环流。先前的研究将其潜在机制与欧亚早春融雪和热带太平洋强迫联系起来。研究表明,北极夏季异常反气旋环流与春季温带北太平洋海温异常(SSTAs)存在显著相关,表明温带北太平洋与北极存在遥相关。海温异常型的特征是温带北太平洋中纬度地区的温暖异常被明显的寒冷异常所包围,类似于太平洋年代际涛动(PDO)的负相,但在热带地区没有明显的信号(称为PDO-样型)。5月的这种负pdo样模式可以刺激罗斯比波从白令海传播到北极,并导致反常的北极反气旋,这种反气旋可以在夏季持续。与此同时,这种类似pdo的负型会持续到夏季,并在白令海上空诱发一次夏季异常地面低压。这种地表低气压引起异常上升运动并诱发高层辐散异常,进一步强化夏季北极反气旋。对流层上层的北极反气旋可以迫使北极和亚北极上空的异常绝热下降,导致北极显著的绝热加热。结果,北极上空出现了明显的变暖,其中心位于对流层中部。数值实验证实了负pdo样海温与夏季北极反气旋之间的联系。
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来源期刊
Atmospheric and Oceanic Science Letters
Atmospheric and Oceanic Science Letters METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.20
自引率
8.70%
发文量
925
审稿时长
12 weeks
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