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Characterization of the unprecedented polynya events north of Greenland in 2017/2018 using remote sensing and reanalysis data

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Acta Oceanologica Sinica 2020年第9期39卷 5-17页

作者： Ruibo Lei Dawei Gui Zhouli Yuan Xiaoping Pang Ding Tao Mengxi Zhai MNR Key Laboratory for Polar Science Polar Research Institute of ChinaShanghai 200136China Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan 430072China

Based on an ice concentration threshold of 90%,it has been identified that two polynya events occurred in the region north of Greenland during the 2017/2018 ice *** winter event lasted from February 20 to March 3,2018 and the summer event persisted from August 2 to September 5,*** minimum ice concentration derived from Advanced Microwave Scanning Radiometer 2(AMSR2)observations was 72%and 65%during the winter and summer events,*** occurrence of both events can be related to strengthened southerly winds associated with an increased east-west zonal surface level air pressure gradient across the north Greenland due to perturbation of mid-troposphere polar *** relatively warm air temperature during the 2017/2018 freezing season in comparison with previous years,together with the occurrence of the winter polynya,formed favourable pre-conditions for ice field fracturing in summer,which promoted the formation of the summer *** southerly winds and increased cover of new ice over the open water were the dominant factors for the disappearance of the winter polynya,whereas increased ice inflow from the north was the primary factor behind the closure of the summer ***-1 Synthetic Aperture Radar(SAR)images were found better suited than AMSR2 observations for quantification of a new ice product during the polynya event because the SAR images have high potential for mapping of different sea ice regimes with finely spatial *** unprecedented polynya events north of Greenland in 2017/2018 are important from the perspective of Arctic sea ice loss because they occurred in a region that could potentially be the last“Arctic sea ice refuge”in future summers.

关键词： sea ice ice concentration ice motion polynya Greenland Arctic Ocean

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Record Low Sea-ice Concentration in the Central Arctic during Summer 2010

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Advances in Atmospheric Sciences 2018年第1期35卷 106-115页

作者： JinpingZHAO David BARBER Shugang ZHANG Qinghua YANG Xiaoyu WANG Hongjie XIE Key Laboratory of Physical Oceanography Ocean University of ChinaQingdao266100China Centre for Earth Observation Science Faculty of Environment Earth and ResourcesUniversity of ManitobaWinnipegManitobaR3T 2N2Canada National Marine Environmental Forecasting Center ChinaBeijing100081China Department of Geological Sciences University of Texas at San AntonioSan AntonioTexas 78284U.S.A.

The Arctic sea-ice extent has shown a declining trend over the past 30 years. ice coverage reached historic minima in 2007 and again in 2012. This trend has recently been assessed to be unique over at least the last 1450 years. In the summer of 2010, a very low sea-ice concentration(SIC) appeared at high Arctic latitudes—even lower than that of surrounding pack ice at lower latitudes. This striking low ice concentration—referred to here as a record low ice concentration in the central Arctic(CARLIC)—is unique in our analysis period of 2003–15, and has not been previously reported in the literature. The CARLIC was not the result of ice melt, because sea ice was still quite thick based on in-situ ice thickness ***, divergent ice drift appears to have been responsible for the CARLIC. A high correlation between SIC and wind stress curl suggests that the sea ice drift during the summer of 2010 responded strongly to the regional wind forcing. The drift trajectories of ice buoys exhibited a transpolar drift in the Atlantic sector and an eastward drift in the Pacific sector,which appeared to benefit the CARLIC in 2010. Under these conditions, more solar energy can penetrate into the open water,increasing melt through increased heat flux to the ocean. We speculate that this divergence of sea ice could occur more often in the coming decades, and impact on hemispheric SIC and feed back to the climate.

关键词： sea ice concentration central Arctic Beaufort Gyre Transpolar Drift ice motion divergence

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