期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 20, 页码 10479-10485出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL075494
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资金
- Norwegian Polar Institute's Centre for Ice, Climate and Ecosystems (ICE) through the N-ICE project
- Ministry of Foreign Affairs of Norway
- Ministry of Climate and Environment of Norway
- Academy of Finland [283101]
- Academy of Finland (AKA) [283101, 283101] Funding Source: Academy of Finland (AKA)
During the Norwegian young sea ICE (N-ICE2015) campaign in early 2015, a deep snowpack was observed, almost double the climatology for the region north of Svalbard. There were significant amounts of snow-ice in second-year ice (SYI), while much less in first-year ice (FYI). Here we use a 1-D snow/ice thermodynamic model, forced with reanalyses, to show that snow-ice contributes to thickness growth of SYI in absence of any bottom growth, due to the thick snow. Growth of FYI is tightly controlled by the timing of growth onset relative to precipitation events. A later growth onset can be favorable for FYI growth due to less snow accumulation, which limits snow-ice formation. We surmise these findings are related to a phenomenon in the Atlantic sector of the Arctic, where frequent storm events bring heavy precipitation during autumn and winter, in a region with a thinning ice cover.
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