期刊
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷 121, 期 4, 页码 2499-2522出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015JC011588
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资金
- French National Research Agency (ANR)
- French Polar Institute (IPEV) as part of the OPTIMISM project [ANR-09-BLAN-0227-01]
- French Polar Institute (IPEV) as part of the OPTIMISM project (IPEV program) [1015]
- U.S. National Science Foundation [ARC-1023662, ARC-0856330]
- JAMSTEC
- International Arctic Research Center from JAMSTEC under JAMSTEC
- International Arctic Research Center from JAMSTEC under IARC
- Agence Nationale de la Recherche (ANR) [ANR-09-BLAN-0227] Funding Source: Agence Nationale de la Recherche (ANR)
- Grants-in-Aid for Scientific Research [16K21700, 16H01596] Funding Source: KAKEN
In the central Arctic Ocean, autonomous observations of the ocean mixed layer and ice documented the transition from cold spring to early summer in 2011. Ice-motion measurements using GPS drifters captured three events of lead opening and ice ridge formation in May and June. Satellite sea ice concentration observations suggest that locally observed lead openings were part of a larger-scale pattern. We clarify how these ice deformation events are linked with the onset of basal sea ice melt, which preceded surface melt by 20 days. Observed basal melt and ocean warming are consistent with the available input of solar radiation into leads, once the advent of mild atmospheric conditions prevents lead refreezing. We use a one-dimensional numerical simulation incorporating a Local Turbulence Closure scheme to investigate the mechanisms controlling basal melt and upper ocean warming. According to the simulation, a combination of rapid ice motion and increased solar energy input at leads promotes basal ice melt, through enhanced mixing in the upper mixed layer, while slow ice motion during a large lead opening in mid-June produced a thin, low-density surface layer. This enhanced stratification near the surface facilitates storage of solar radiation within the thin layer, instead of exchange with deeper layers, leading to further basal ice melt preceding the upper surface melt.
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