气候变化领域集成服务门户(CCPortal): The MOSAiC ice floe: Sediment-laden survivor from the Siberian shelf

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DOI	10.5194/tc-14-2173-2020
	The MOSAiC ice floe: Sediment-laden survivor from the Siberian shelf
	Krumpen T.; Birrien F.; Kauker F.; Rackow T.; Von Albedyll L.; Angelopoulos M.; Jakob Belter H.; Bessonov V.; Damm E.; Dethloff K.; Haapala J.; Haas C.; Harris C.; Hendricks S.; Hoelemann J.; Hoppmann M.; Kaleschke L.; Karcher M.; Kolabutin N.; Lei R.; Lenz J.; Morgenstern A.; Nicolaus M.; Nixdorf U.; Petrovsky T.; Rabe B.; Rabenstein L.; Rex M.; Ricker R.; Rohde J.; Shimanchuk E.; Singha S.; Smolyanitsky V.; Sokolov V.; Stanton T.; Timofeeva A.; Tsamados M.; Watkins D.
发表日期	2020
ISSN	19940416
起始页码	2173
结束页码	2187
卷号	14 期号:7
英文摘要	In September 2019, the research icebreaker Polarstern started the largest multidisciplinary Arctic expedition to date, the MOSAiC (Multidisciplinary drifting Observatory for the Study of Arctic Climate) drift experiment. Being moored to an ice floe for a whole year, thus including the winter season, the declared goal of the expedition is to better understand and quantify relevant processes within the atmosphere-ice-ocean system that impact the sea ice mass and energy budget, ultimately leading to much improved climate models. Satellite observations, atmospheric reanalysis data, and readings from a nearby meteorological station indicate that the interplay of high ice export in late winter and exceptionally high air temperatures resulted in the longest ice-free summer period since reliable instrumental records began. We show, using a Lagrangian tracking tool and a thermodynamic sea ice model, that the MOSAiC floe carrying the Central Observatory (CO) formed in a polynya event north of the New Siberian Islands at the beginning of December 2018. The results further indicate that sea ice in the vicinity of the CO (<40 km distance) was younger and 36 % thinner than the surrounding ice with potential consequences for ice dynamics and momentum and heat transfer between ocean and atmosphere. Sea ice surveys carried out on various reference floes in autumn 2019 verify this gradient in ice thickness, and sediments discovered in ice cores (so-called dirty sea ice) around the CO confirm contact with shallow waters in an early phase of growth, consistent with the tracking analysis. Since less and less ice from the Siberian shelves survives its first summer (Krumpen et al., 2019), the MOSAiC experiment provides the unique opportunity to study the role of sea ice as a transport medium for gases, macronutrients, iron, organic matter, sediments and pollutants from shelf areas to the central Arctic Ocean and beyond. Compared to data for the past 26 years, the sea ice encountered at the end of September 2019 can already be classified as exceptionally thin, and further predicted changes towards a seasonally ice-free ocean will likely cut off the long-range transport of ice-rafted materials by the Transpolar Drift in the future. A reduced long-range transport of sea ice would have strong implications for the redistribution of biogeochemical matter in the central Arctic Ocean, with consequences for the balance of climate-relevant trace gases, primary production and biodiversity in the Arctic Ocean. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
英文关键词	energy budget; ice breaker; ice flow; sea ice; sediment analysis; Arctic Ocean
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202130
作者单位	Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, Bremerhaven, 27570, Germany; Arctic and Antarctic Research Institute, Ulitsa Beringa, 38, Saint Petersburg, 199397, Russian Federation; Finnish Meteorological Institute, Marine Research, P.O. Box 503, Helsinki, 00101, Finland; Dartmouth College, Department of Earth Science, 6105 Fairchild Hall, Hanover, NH 03755, United States; Polar Research Institute of China, MNR Key Laboratory for Polar Science, 451 Jinqiao Road, Pudong, Shanghai, 200136, China; Association of Polar Early Career Scientists, Alfred Wegener Institute for Polar and Marine Research, Telegrafenberg A45, Potsdam, 14473, Germany; Drift and Noise Polar Services, Stavendamm 17, Bremen, 28195, Germany; German Aerospace Center, Remote Sensing Technology Institute, SAR Signal Processing, Am Fallturm 9, Bremen, 28359, Germany; Naval Postgraduate School, Oceanography Department, 833 Dyer Road, Building 232, Monterey, 93943, United States; Centre for Polar...
推荐引用方式 GB/T 7714	Krumpen T.,Birrien F.,Kauker F.,et al. The MOSAiC ice floe: Sediment-laden survivor from the Siberian shelf[J],2020,14(7).
APA	Krumpen T..,Birrien F..,Kauker F..,Rackow T..,Von Albedyll L..,...&Watkins D..(2020).The MOSAiC ice floe: Sediment-laden survivor from the Siberian shelf.Cryosphere,14(7).
MLA	Krumpen T.,et al."The MOSAiC ice floe: Sediment-laden survivor from the Siberian shelf".Cryosphere 14.7(2020).