Arctic Cyclone Activity and the Beaufort High
Arctic Cyclone Activity and the Beaufort High
复制标题
北极气旋活动和波弗特高压
DOI：
10.1175/jcli-d-20-0771.1
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发表时间：
2021
影响因子：
4.9
通讯作者：
Timmermans, M.-L.
中科院分区：
文献类型：
--
作者：
Kenigson, Jessica S.;Timmermans, M.-L.
波弗特高压（BH）及其伴随的反气旋风驱动了北冰洋的波弗特环流，这是北冰洋的主要淡水储存库。波弗特环流及其积累或释放淡水的能力依赖于BH的强度。据推测，北欧海气旋向北极的迁移可以缓和BH的强度。我们通过分析再分析海平面压力场来表征BH，并识别和跟踪1948年至2019年期间60°N以北的气旋，来探索这一假设。对北欧海气旋轨迹的聚类分析显示，西部气旋路径（穿过北极内部）与相对较弱的BH有关，东部气旋路径（沿着北极外围）与相对较强的BH有关。此外，我们在北极和北欧海域构建了考虑多个气旋参数（数量、强度和持续时间）的气旋活动指数（CAIs）。1948-2019年期间，北极和北欧海域的热带气旋与BH之间存在显著的相关性，异常强的气旋活动与异常弱的BH相关，反之亦然。我们展示了北极和北欧海CAIs在分析的前40年（1948 - 1988年）和最近30年（1989-2019年）之间如何经历了气旋活动增加的政权转变。在同样的两个时间段内，黑洞呈现出减弱的趋势。气旋活动的增加和BH随之减弱可能与北极变暖的预期相一致，并对波弗特环流动力学和淡水产生影响。
The Beaufort high (BH) and its accompanying anticyclonic winds drive the Arctic Ocean’s Beaufort Gyre, the major freshwater reservoir of the Arctic Ocean. The Beaufort Gyre circulation and its capacity to accumulate or release freshwater rely on the BH intensity. The migration of Nordic seas cyclones into the Arctic has been hypothesized to moderate the strength of the BH. We explore this hypothesis by analyzing reanalysis sea level pressure fields to characterize the BH and identify and track cyclones north of 60°N during 1948–2019. A cluster analysis of Nordic seas cyclone trajectories reveals a western pathway (through the Arctic interior) associated with a relatively weak BH and an eastern pathway (along the Arctic periphery) associated with a relatively strong BH. Furthermore, we construct cyclone activity indices (CAIs) in the Arctic and Nordic seas that take into account multiple cyclone parameters (number, strength, and duration). There are significant correlations between the BH and the CAIs in the Arctic and Nordic seas during 1948–2019, with anomalously strong cyclone activity related to an anomalously weak BH, and vice versa. We show how the Arctic and Nordic seas CAIs experienced a regime shift toward increased cyclone activity between the first four decades analyzed (1948–88) and the most recent three decades (1989–2019). Over the same two time periods, the BH exhibits a weakening. Increased cyclone activity and an accompanying weakening of the BH may be consistent with expectations in a warming Arctic and have implications for Beaufort Gyre dynamics and freshwater.
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影响因子：
4.4
作者：
Harvey, B. J.;Cook, P.;Schiemann, R.
通讯作者：
Schiemann, R.
影响因子：
4.8
作者：
M. Sepp;J. Jaagus
通讯作者：
J. Jaagus
DOI：
10.1098/rsta.2014.0160
发表时间：
2015-10-13
期刊：
Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
影响因子：
--
作者：
Proshutinsky A;Dukhovskoy D;Timmermans ML;Krishfield R;Bamber JL
通讯作者：
Bamber JL
影响因子：
4.9
作者：
Zhang, XD;Walsh, JE;Ikeda, M
通讯作者：
Ikeda, M