气候变化领域集成服务门户(CCPortal): Linking sea ice deformation to ice thickness redistribution using high-resolution satellite and airborne observations

CCPortal

DOI	10.5194/tc-15-2167-2021
	Linking sea ice deformation to ice thickness redistribution using high-resolution satellite and airborne observations
	Von Albedyll L.; Haas C.; Dierking W.
发表日期	2021
ISSN	19940416
起始页码	2167
结束页码	2186
卷号	15 期号:5
英文摘要	An unusual, large, latent-heat polynya opened and then closed by freezing and convergence north of Greenland's coast in late winter 2018. The closing presented a natural but well-constrained full-scale ice deformation experiment. We observed the closing of and deformation within the polynya with satellite synthetic-aperture radar (SAR) imagery and measured the accumulated effects of dynamic and thermodynamic ice growth with an airborne electromagnetic (AEM) ice thickness survey 1 month after the closing began. During that time, strong ice convergence decreased the area of the refrozen polynya by a factor of 2.5. The AEM survey showed mean and modal thicknesses of the 1-month-old ice of 1.96±1.5m and 1.1 m, respectively. We show that this is in close agreement with modeled thermodynamic growth and with the dynamic thickening expected from the polynya area decrease during that time. We found significant differences in the shapes of ice thickness distributions (ITDs) in different regions of the refrozen polynya. These closely corresponded to different deformation histories of the surveyed ice that we reconstructed from Lagrangian ice drift trajectories in reverse chronological order. We constructed the ice drift trajectories from regularly gridded, high-resolution drift fields calculated from SAR imagery and extracted deformation derived from the drift fields along the trajectories. Results show a linear proportionality between convergence and thickness change that agrees well with the ice thickness redistribution theory. We found a proportionality between the e folding of the ITDs' tails and the total deformation experienced by the ice. Lastly, we developed a simple, volumeconserving model to derive dynamic ice thickness change from the combination of Lagrangian trajectories and highresolution SAR drift and deformation fields. The model has a spatial resolution of 1.4 km and reconstructs thickness profiles in reasonable agreement with the AEM observations. The modeled ITD resembles the main characteristics of the observed ITD, including mode, e folding, and full width at half maximum. Thus, we demonstrate that high-resolution SAR deformation observations are capable of producing realistic ice thickness distributions. © 2021 EDP Sciences. All rights reserved.
英文关键词	airborne survey; deformation; electromagnetic method; experimental study; freezing; ice thickness; observatory; polynya; radar imagery; satellite altimetry; sea ice; spectral resolution; synthetic aperture radar; thermodynamics; trajectory
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/202449
作者单位	Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, 27570, Germany; Institute of Environmental Physics, University of Bremen, Bremen, 28359, Germany; Center for Integrated Remote Sensing and Forecasting for Arctic Operations, UiT-The Arctic University of Norway, Tromsø, 9019, Norway
推荐引用方式 GB/T 7714	Von Albedyll L.,Haas C.,Dierking W.. Linking sea ice deformation to ice thickness redistribution using high-resolution satellite and airborne observations[J],2021,15(5).
APA	Von Albedyll L.,Haas C.,&Dierking W..(2021).Linking sea ice deformation to ice thickness redistribution using high-resolution satellite and airborne observations.Cryosphere,15(5).
MLA	Von Albedyll L.,et al."Linking sea ice deformation to ice thickness redistribution using high-resolution satellite and airborne observations".Cryosphere 15.5(2021).