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The 2017 Reversal of the Beaufort Gyre: Can Dynamic Thickening of a Seasonal Ice Cover During a Reversal Limit Summer Ice Melt in the Beaufort Sea?
Journal of Geophysical Research: Oceans ( IF 3.3 ) Pub Date : 2020-11-21 , DOI: 10.1029/2020jc016796
D. G. Babb 1 , J. C. Landy 2 , J. V. Lukovich 1 , C. Haas 3 , S. Hendricks 3 , D. G. Barber 1 , R. J. Galley 1
Affiliation  

During winter 2017, the semipermanent Beaufort High collapsed and the anticyclonic Beaufort Gyre reversed. The reversal drove eastward ice motion through the Western Arctic, causing sea ice to converge against Banks Island, and halted the circulation of multiyear sea ice via the gyre, preventing its replenishment in the Beaufort Sea. Prior to the reversal, an anomalously thin seasonal ice cover had formed in the Beaufort following ice‐free conditions during September 2016. With the onset of the reversal in January 2017, convergence drove uncharacteristic dynamic thickening during winter. By the end of March, despite seasonal ice comprising 97% of the ice cover, the reversal created the thickest, roughest, and most voluminous regional ice cover of the CryoSat‐2 record. Within the Beaufort Sea, previous work has shown that winter ice export can precondition the region for increased summer ice melt, but that a short reversal during April 2013 contributed to a reduction in summer ice loss. Hence, the deformed ice cover at the end of winter 2017 could be expected to limit summer melt. In spite of this, the Beaufort ice cover fell to its fourth lowest September area as the gyre re‐established during April and divergent ice drift broke up the pack, negating the reversal's earlier preconditioning. Our work highlights that dynamic winter thickening of a regional sea ice cover, for instance during a gyre reversal, offers the potential to limit summer ice loss, but that dynamic forcing during spring dictates whether this conditioning carries through to the melt season.

中文翻译:

2017年博福特涡流的逆转:夏季逆转极限期间,博福特海中的季节性冰盖会动态增厚吗?

2017年冬季,半永久性的Beaufort High坍塌,反气旋的Beaufort Gyre倒转。逆转带动西冰洋向东移动,导致海冰汇聚到班克斯岛,并阻止了多年海冰通过旋流的循环,从而阻止了它在波弗特海的补给。逆转之前,2016年9月无冰条件之后,博福特形成了异常薄的季节性冰盖。随着逆转于2017年1月开始,收敛促使冬季出现异常的动态增厚。到3月底,尽管季节性冰覆盖了97%的冰盖,但逆转形成了CryoSat-2记录中最厚,最粗糙和最大量的区域冰盖。在波弗特海,先前的工作表明,冬季冰出口可以为该地区增加夏季冰融化提供先决条件,但2013年4月的短暂逆转有助于减少夏季冰的流失。因此,预计2017年冬季末变形的冰盖将限制夏季融化。尽管如此,Beaufort的冰盖下降到9月的第四低点,因为回旋在4月重新建立,并且分散的冰漂打破了背包,从而抵消了逆转的较早预处理。我们的工作强调,区域性海冰盖的动态冬季增厚(例如在回旋期间)可能会限制夏季冰的流失,但春季的动态强迫决定了这种条件是否会持续到融化季节。但2013年4月的短暂逆转有助于减少夏季冰的流失。因此,预计2017年冬季末变形的冰盖将限制夏季融化。尽管如此,Beaufort的冰盖下降到9月的第四低点,因为回旋在4月重新建立,并且分散的冰漂打破了背包,从而抵消了逆转的较早预处理。我们的工作强调,区域性海冰盖的动态冬季增厚(例如在回旋期间)可能会限制夏季冰的流失,但春季的动态强迫决定了这种条件是否会持续到融化季节。但2013年4月的短暂逆转有助于减少夏季冰的流失。因此,预计2017年冬季末变形的冰盖将限制夏季融化。尽管如此,Beaufort的冰盖下降到9月的第四低点,因为回旋在4月重新建立,并且分散的冰漂打破了背包,从而抵消了逆转的较早预处理。我们的工作强调,区域性海冰盖的动态冬季增厚(例如在回旋期间)可能会限制夏季冰的流失,但春季的动态强迫决定了这种条件是否会持续到融化季节。由于4月重新建立了回旋管,Beaufort的冰盖降到了9月的第四低点,并且不同的冰漂分散了整个冰袋,从而抵消了逆转的较早预处理。我们的工作强调,区域性海冰盖的动态冬季增厚(例如在回旋期间)可能会限制夏季冰的流失,但春季的动态强迫决定了这种条件是否会持续到融化季节。由于4月重新建立了回旋管,Beaufort的冰盖降到了9月的第四低点,并且不同的冰漂分散了整个冰袋,从而抵消了逆转的较早预处理。我们的工作强调,区域性海冰盖的动态冬季增厚(例如在回旋期间)可能会限制夏季冰的流失,但春季的动态强迫决定了这种条件是否会持续到融化季节。
更新日期:2020-12-08
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