气候变化领域集成服务门户(CCPortal): Contribution of Snow to Arctic First-Year and Multi-Year Sea Ice Mass Balance Within the Last Ice Area

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DOI	10.1029/2020JC016971
	Contribution of Snow to Arctic First-Year and Multi-Year Sea Ice Mass Balance Within the Last Ice Area
	Lange B.A.; Haas C.; Mucci A.; Beckers J.F.; Casey J.A.; Duerksen S.; Granskog M.A.; Hatam I.; Niemi A.; Reppchen A.; Michel C.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	We present the δ18O isotope composition of 16 multi-year ice (MYI) and eight first-year ice (FYI) cores collected during spring from the Lincoln Sea, a region within the Last Ice Area, which is expected to retain MYI longest into the future. Isotopic signatures were used to quantify the contribution of snow to sea ice mass. These estimates yield a higher total snow contribution in MYI (10 ± 5%) than to FYI (4 ± 2%). Converted to Snow Depth Equivalent (SDE), MYI had five times larger SDE (0.79 ± 0.38 m) than FYI (0.16 ± 0.11 m). The difference is explained by the contribution of refrozen surface and under-ice melt ponds as well as superimposed/interposed ice for MYI resulting from higher accumulation of snow over multiple, longer accumulation seasons compared to FYI. Given the impending replacement of MYI by FYI, the large difference in absolute snow contributions between MYI and FYI highlights the potential implications in terms of the redistribution of precipitation-derived (meteoric) freshwater throughout the Arctic Ocean. Furthermore, we observed high relative snow contributions to ice mass in the surface of one-third of older FYI cores, which we attributed to flooding and formation of snow-ice. Our results support the premise that flooding events on FYI may be more prevalent throughout the Arctic Ocean than previously assumed. © 2021. The Authors.
英文关键词	First-year sea ice; High Arctic; Last Ice Area; meteoric ice; multi-year sea ice; oxygen isotopes; perennial sea ice; sea ice mass balance; snow-ice
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186317
作者单位	Fisheries and Oceans Canada, Freshwater Institute, Winnipeg, MB, Canada; Norwegian Polar Institute, Tromsø, Norway; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, Canada; Department of Earth and Space Sciences and Engineering, York University, Toronto, ON, Canada; GEOTOP & Department of Earth & Planetary Sciences, McGill University, Montreal, QC, Canada; Northern Forestry Centre, Canadian Forest Service, Natural Resources Canada, Edmonton, AB, Canada; Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada; Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC, Canada; Department of Environment & Geography, Center for Earth Observation Science, University of Manitoba, Winnipeg, MB, Canada
推荐引用方式 GB/T 7714	Lange B.A.,Haas C.,Mucci A.,et al. Contribution of Snow to Arctic First-Year and Multi-Year Sea Ice Mass Balance Within the Last Ice Area[J],2021,126(5).
APA	Lange B.A..,Haas C..,Mucci A..,Beckers J.F..,Casey J.A..,...&Michel C..(2021).Contribution of Snow to Arctic First-Year and Multi-Year Sea Ice Mass Balance Within the Last Ice Area.Journal of Geophysical Research: Oceans,126(5).
MLA	Lange B.A.,et al."Contribution of Snow to Arctic First-Year and Multi-Year Sea Ice Mass Balance Within the Last Ice Area".Journal of Geophysical Research: Oceans 126.5(2021).