气候变化领域集成服务门户(CCPortal): First-year sea ice melt pond fraction estimation from dual-polarisation C-band SAR

CCPortal

DOI	10.5194/tc-8-2163-2014
	First-year sea ice melt pond fraction estimation from dual-polarisation C-band SAR - Part 2: Scaling in situ to Radarsat-2
	Scharien R.K.; Hochheim K.; Landy J.; Barber D.G.
发表日期	2014
ISSN	19940416
卷号	8 期号:6
英文摘要	Sea ice melt pond fraction (fp), linked with lower sea ice surface albedo and increased light transmittance to the ocean, is inadequately parameterised in sea ice models due to a lack of observations. In this paper, results from a multi-scale remote-sensing program dedicated to the retrieval of level first-year sea ice (FYI) fp from dual co- and cross-polarisation C-band synthetic aperture radar (SAR) backscat-ter are detailed. Models which utilise the dominant effect of free-water melt ponds on the VV/HH (vertical transmit and vertical receive/horizontal transmit and horizontal receive) polarisation ratio at high incidence angles are tested for their ability to provide estimates of the subscale fp. Retrieved fp from noise-corrected Radarsat-2 quad-polarisation scenes are in good agreement with observations from coincident aerial survey data, with root mean square errors (RMSEs) of 0.05-0.07 obtained during intermediate and late stages of ponding. Weak model performance is attributed to the presence of wet snow and slush during initial ponding, and a synoptically driven freezing event causing ice lids to form on ponds. The HV/HH (horizontal transmit and vertical receive/horizontal transmit and horizontal receive) ratio explains a greater portion of variability in fp, compared to VV/HH, when ice lids are present. Generally low HV channel intensity suggests limited applications using dual cross-polarisation data, except with systems that have exceptionally low noise floors. Results demonstrate the overall potential of dual-polarisation SAR for standalone or complementary observations of fp for process-scale studies and improvements to model parameterisations.
学科领域	aerial survey; freezing; parameterization; polarization; pond; RADARSAT; remote sensing; sea ice; synthetic aperture radar; transmittance
语种	英语
scopus关键词	aerial survey; freezing; parameterization; polarization; pond; RADARSAT; remote sensing; sea ice; synthetic aperture radar; transmittance
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/120007
作者单位	Department of Geography, University of Victoria, Victoria, BC, Canada; Centre for Earth Observation Science, Faculty of Environment Earth and Resources, University of Manitoba, Winnipeg, MB, Canada
推荐引用方式 GB/T 7714	Scharien R.K.,Hochheim K.,Landy J.,et al. First-year sea ice melt pond fraction estimation from dual-polarisation C-band SAR - Part 2: Scaling in situ to Radarsat-2[J],2014,8(6).
APA	Scharien R.K.,Hochheim K.,Landy J.,&Barber D.G..(2014).First-year sea ice melt pond fraction estimation from dual-polarisation C-band SAR - Part 2: Scaling in situ to Radarsat-2.Cryosphere,8(6).
MLA	Scharien R.K.,et al."First-year sea ice melt pond fraction estimation from dual-polarisation C-band SAR - Part 2: Scaling in situ to Radarsat-2".Cryosphere 8.6(2014).