The Cyclonic Mode of Arctic Ocean Circulation

The Cyclonic Mode of Arctic Ocean Circulation
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北冰洋环流的气旋模式

DOI:
10.1175/jpo-d-20-0190.1
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发表时间:
2021
影响因子:
3.5
通讯作者:
Guthrie, John
Guthrie, John
中科院分区:
地球科学2区
文献类型:
--
作者:
Morison, James;Kwok, Ron;Dickinson, Suzanne;Andersen, Roger;Peralta-Ferriz, Cecilia;Morison, David;Rigor, Ignatius;Dewey, Sarah;Guthrie, John

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北冰洋表面环流的变化不应被视为反气旋波弗特环流的强度。虽然波弗特环流是北冰洋平均表面环流的主要特征,但对动力高度(1950 - 1989)和卫星测高得到的海洋动力地形(2004-19)的经验正交函数分析表明,其气旋模式的主要变化模式是由海面的低气压和北冰洋俄罗斯一侧的气旋式表面环流主导的。1989年和2007 - 2008年北极涛动(AO)极大期和2010年AO极小期后的地表环流变化表明,气旋模式是由AO强迫的,滞后约1年。从20世纪90年代初开始,北冰洋表面环流经历了气旋性转变,与平均AO增加一个标准差有关,这可以通过空间平均涡度增加来证明。在AO增加的情况下,气旋模式复合物还包括海冰和近地表淡水输出增加,欧亚径流路径改变,波弗特海变新鲜,使海冰与大西洋水热隔绝的冷盐斜层减弱,大西洋水流入增加和深海气旋环流加剧了这种影响。气旋模式与AO的联系是重要的,因为AO是一个主要的全球尺度气候指数,预计会随着全球变暖而增加。考虑到目前在波弗特环流和跨极漂移中现场测量的浓度偏差,应协调努力以更好地观察气旋模式。
Arctic Ocean surface circulation change should not be viewed as the strength of the anticyclonic Beaufort Gyre. While the Beaufort Gyre is a dominant feature of average Arctic Ocean surface circulation, empirical orthogonal function analysis of dynamic height (1950–89) and satellite altimetry–derived dynamic ocean topography (2004–19) show the primary pattern of variability in its cyclonic mode is dominated by a depression of the sea surface and cyclonic surface circulation on the Russian side of the Arctic Ocean. Changes in surface circulation after Arctic Oscillation (AO) maxima in 1989 and 2007–08 and after an AO minimum in 2010 indicate the cyclonic mode is forced by the AO with a lag of about 1 year. Associated with a one standard deviation increase in the average AO starting in the early 1990s, Arctic Ocean surface circulation underwent a cyclonic shift evidenced by increased spatial-average vorticity. Under increased AO, the cyclonic mode complex also includes increased export of sea ice and near-surface freshwater, a changed path of Eurasian runoff, a freshened Beaufort Sea, and weakened cold halocline layer that insulates sea ice from Atlantic water heat, an impact compounded by increased Atlantic Water inflow and cyclonic circulation at depth. The cyclonic mode’s connection with the AO is important because the AO is a major global scale climate index predicted to increase with global warming. Given the present bias in concentration of in situ measurements in the Beaufort Gyre and Transpolar Drift, a coordinated effort should be made to better observe the cyclonic mode.
DOI: 10.1029/2018gl078386
发表时间: 2018-07-16
影响因子: 5.2
作者:
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影响因子: --
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DOI: --
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DOI: --
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