The Dynamic Response of Sea Ice to Warming in the Canadian Arctic Archipelago
The Dynamic Response of Sea Ice to Warming in the Canadian Arctic Archipelago
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DOI：
10.1029/2019gl085116
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发表时间：
2019-11-28
影响因子：
5.2
通讯作者：
Brady, Mike
中科院分区：
文献类型：
--
作者：
Howell, Stephen E. L.;Brady, Mike
加拿大北极群岛(CAA)的冰拱在一年中的大部分时间里阻止了北冰洋冰的流入。利用北冰洋-CAA冰交换的22年记录(1997-2018年)，研究了气候变暖对CAA海冰动力学的影响。更大的冰区通量值与更长的流动持续时间和更快的冰速有关，这是由于从CAA过渡到更年轻和更薄的冰区的开放水域回旋余地增加，这些共同导致从北冰洋到CAA北部的冰区通量从1997年到2018年显著增加(10(3)公里(2)/年)。值得注意的是，2016年北冰洋流入CAA的冰面通量(161×10(3)公里(2))是1997-2018年平均值(23×10(3)公里(2))的7倍，几乎是2007年流入纳雷斯海峡(87×10(3)公里(2))的两倍。持续变暖可能导致CAA成为北冰洋冰面积损失的更大出口。计划语言摘要卫星观测被用来了解温度变暖对加拿大北极群岛(CAA)和北冰洋之间海冰转移的影响。较大的海冰面积通量值与(I)更长的流动持续时间，(Ii)更快的冰移动，以及(Iii)从CAA的长期过渡到更年轻和更薄的冰区的更大的开放水域余地有关。这些因素导致从1997年到2018年进入CAA北部地区的海冰数量大幅增加。值得注意的是，2016年进入CAA的北冰洋冰量是1997-2018年平均水平的7倍，几乎是2007年通过纳雷斯海峡的冰量的两倍。总体而言，随着持续变暖，CAA可能成为北冰洋海冰消失的更大途径。
Ice arches in the Canadian Arctic Archipelago (CAA) block the inflow of Arctic Ocean ice for the majority of the year. A 22 year record (1997-2018) of Arctic Ocean-CAA ice exchange was used to investigate the effect of warming on CAA sea ice dynamics. Larger ice area flux values were associated with longer flow duration and faster ice speed facilitated by increased open water leeway from the CAA's transition to a younger and thinner ice regime, which together have contributed to a significant ice area flux increase (10(3) km(2)/year) from Arctic Ocean into the northern CAA from 1997 to 2018. Remarkably, the 2016 Arctic Ocean ice area flux into the CAA (161 x 10(3) km(2)) was 7 times greater than the 1997-2018 average (23 x 10(3) km(2)) and almost double the 2007 ice area flux into Nares Strait (87 x 10(3) km(2)). Continued warming may result in the CAA becoming a larger outlet for Arctic Ocean ice area loss.Plan Language Summary Satellite observations are used to understand the effect of warmer temperatures on how much sea ice is transferred between the Canadian Arctic Archipelago (CAA) and the Arctic Ocean. Larger sea ice area flux values are associated with (i) longer flow duration, (ii) faster moving ice, and (iii) more open water leeway from the CAA's long-term transition to a younger and thinner ice regime. These factors have contributed to a significant increase in the amount of sea ice entering the northern regions of the CAA from 1997 to 2018. Remarkably, the amount of Arctic Ocean ice entering the CAA in 2016 was 7 times larger the 1997-2018 average and almost double that of the amount of ice transported through Nares Strait in 2007. Overall, with continued warming the CAA could be larger pathway for the loss of sea ice in the Arctic Ocean.