Snow Loss Into Leads in Arctic Sea Ice: Minimal in Typical Wintertime Conditions, but High During a Warm and Windy Snowfall Event
Snow Loss Into Leads in Arctic Sea Ice: Minimal in Typical Wintertime Conditions, but High During a Warm and Windy Snowfall Event
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北极海冰中的积雪流失量：在典型的冬季条件下极小，但在温暖多风的降雪事件中很高
DOI：
10.1029/2023gl102816
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发表时间：
2023
影响因子：
5.2
通讯作者：
von Albedyll, Luisa
中科院分区：
文献类型：
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作者：
Clemens‐Sewall, David;Polashenski, Chris;Frey, Markus M.;Cox, Christopher J.;Granskog, Mats A.;Macfarlane, Amy R.;Fons, Steven W.;Schmale, Julia;Hutchings, Jennifer K.;von Albedyll, Luisa
北极海冰上的积雪量影响着冰量的平衡。风重新分配到开放水域的铅雪被假设为造成显着的冬季雪损失。然而，没有直接测量到北极铅的雪损失。我们测量了2020年冬季北极中部四个地区的降雪量。我们发现，与预期相反，在典型的冬季条件下，最小的雪损失成铅。然而，在一场带来暖空气温度、大风和降雪的气旋期间，35.0 ± 1.1厘米的雪水当量（SWE）损失到铅中（每单位铅面积）。这相当于从整个表面移除0.7-1.1 cm SWE-占该站点年降雪量的6%-10%。温暖的空气温度，这增加了时间的长度，冬季铅保持不冻结，可能是一个低估的因素，在雪损失到铅。
The amount of snow on Arctic sea ice impacts the ice mass budget. Wind redistribution of snow into open water in leads is hypothesized to cause significant wintertime snow loss. However, there are no direct measurements of snow loss into Arctic leads. We measured the snow lost in four leads in the Central Arctic in winter 2020. We find, contrary to expectations, that under typical winter conditions, minimal snow was lost into leads. However, during a cyclone that delivered warm air temperatures, high winds, and snowfall, 35.0 ± 1.1 cm snow water equivalent (SWE) was lost into a lead (per unit lead area). This corresponded to a removal of 0.7–1.1 cm SWE from the entire surface—∼6%–10% of this site's annual snow precipitation. Warm air temperatures, which increase the length of time that wintertime leads remain unfrozen, may be an underappreciated factor in snow loss into leads.