气候变化领域集成服务门户(CCPortal): On producing sea ice deformation data sets from SAR-derived sea ice motion

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DOI	10.5194/tc-9-663-2015
	On producing sea ice deformation data sets from SAR-derived sea ice motion
	Bouillon S.; Rampal P.
发表日期	2015
ISSN	19940416
卷号	9 期号:2
英文摘要	We propose a method to reduce the error generated when computing sea ice deformation fields from synthetic aperture radar (SAR)-derived sea ice motion. The method is based on two steps. The first step consists of using a triangulation of the positions taken from the sea ice trajectories to define a mesh on which a first estimate of sea ice deformation is computed. The second step consists of applying a specific smoother to the deformation field to reduce the artificial noise that arises along discontinuities in the sea ice motion field. This method is here applied to RADARSAT Geophysical Processor System (RGPS) sea ice trajectories having a temporal and spatial resolution of about 3 days and 10 km, respectively. From the comparison between unfiltered and filtered fields, we estimate that the artificial noise causes an overestimation of about 60% of opening and closing. The artificial noise also has a strong impact on the statistical distribution of the deformation and on the scaling exponents estimated with multifractal analysis. We also show that a similar noise is present in the deformation fields provided in the widely used four-point deformation RGPS data set. These findings may have serious implications for previous studies as the constant overestimation of the opening and closing could lead to a large overestimation of freezing in leads, salt rejection and sea ice ridging. © Author(s) 2015.
学科领域	cryosphere; data set; deformation; freezing; ice flow; RADARSAT; sea ice; synthetic aperture radar; triangulation
语种	英语
scopus关键词	cryosphere; data set; deformation; freezing; ice flow; RADARSAT; sea ice; synthetic aperture radar; triangulation
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/119921
作者单位	Nansen Environmental and Remote Sensing Center, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway
推荐引用方式 GB/T 7714	Bouillon S.,Rampal P.. On producing sea ice deformation data sets from SAR-derived sea ice motion[J],2015,9(2).
APA	Bouillon S.,&Rampal P..(2015).On producing sea ice deformation data sets from SAR-derived sea ice motion.Cryosphere,9(2).
MLA	Bouillon S.,et al."On producing sea ice deformation data sets from SAR-derived sea ice motion".Cryosphere 9.2(2015).