Methane release from open leads and new ice following an Arctic winter storm event

Methane release from open leads and new ice following an Arctic winter storm event
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北极冬季风暴事件后,裸露的引线和新冰释放出甲烷

DOI:
10.1016/j.polar.2022.100874
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发表时间:
2022
期刊:
影响因子:
1.8
通讯作者:
Granskog Mats A.
Granskog Mats A.
中科院分区:
地球科学4区
文献类型:
--
作者:
Silyakova Anna;Nomura Daiki;Kotovitch Marie;Fransson Agneta;Delille Bruno;Chierici Melissa;Granskog Mats A.

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我们研究了北极冬季风暴事件,导致冰破裂,形成开放的引线,以及随后的冻结这些引线。在风暴发生之前和期间,冰下表层水的甲烷浓度为8-12 nmol L−1,这导致在开放的引线中,潜在的海-气甲烷通量范围为+0.2至+2.1 mg CH 4 m −2d− 1。CH 4通气海水和大气之间发生时,开放水域的分数和风速增加。风暴过后的9天里,海冰厚达27厘米。最初,海冰盐水中的CH 4浓度高于与大气的平衡。随着冰层变厚,大部分甲烷从海冰上层流失到大气中,这意味着在冰覆盖后,甲烷继续逃逸。这表明,冬季甲烷排放量需要更好地限制。
We examine an Arctic winter storm event, which led to ice break–up, the formation of open leads, and the subsequent freezing of these leads. The methane (CH4) concentration in under–ice surface water before and during the storm event was 8–12 nmol L−1, which resulted in a potential sea–to–air CH4flux ranging from +0.2 to +2.1 mg CH4m−2d−1in open leads. CH4ventilation between seawater and atmosphere occurred when both open water fraction and wind speed increased. Over the nine days after the storm, sea ice grew 27 cm thick. Initially, CH4concentrations in the sea ice brine were above the equilibrium with the atmosphere. As the ice grew thicker, most of the CH4was lost from upper layers of sea ice into the atmosphere, implying continued CH4evasion after the leads were ice–covered. This suggests that wintertime CH4emissions need to be better constrained.
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