气候变化领域集成服务门户(CCPortal): Seasonal evolution of L-band SAR backscatter over landfast Arctic sea ice

CCPortal

DOI	10.1016/j.rse.2020.112049
	Seasonal evolution of L-band SAR backscatter over landfast Arctic sea ice
	Mahmud M.S.; Nandan V.; Howell S.E.L.; Geldsetzer T.; Yackel J.
发表日期	2020
ISSN	00344257
卷号	251
英文摘要	We construct and present the first baseline, time series evolution of L-band SAR microwave backscatter (σ0HH) for landfast Arctic first-year (FYI) and multi-year (MYI) sea ice from ALOS PALSAR. We compare the winter to freeze-up seasonal L-band σ0HH signatures with C-band RADARSAT-2 SAR imagery and Ku-band QuikSCAT scatterometer data. We also explored the utility of L-band σ0HH to detect FYI and MYI melt onset dates. For both ice types, L-band exhibited a similar σ0HH evolution to C- and Ku-bands. A rise in L-band σ0HH was observed from winter to melt onset, however, with a lower magnitude attributed to the larger penetration of L-band microwaves through the snow-covered sea ice medium. Over FYI, L-band σ0HH exhibited the most robust response and greater diversity in melt onset signature, compared to C- and Ku-bands. Over MYI, L-band σ0HH declined during the winter to melt onset transition contrasting the C- and Ku-band evolution of σ0HH during melt onset. Although, a distinct L-band σ0HH response was not found during pond onset, a very strong σ0HH response was found during sea ice break-up, which could operationally be utilized to identify sea ice break-up timing. During freeze-up, L-band σ0HH showed greater diversity compared to C- and Ku-bands. Our study also found that, L-band detected melt onset dates were up to 6 days later than C- and Ku-band detected dates, for both ice types. The melt response was the strongest at L-band for FYI, where C-band detected a robust melt onset date for MYI. Therefore, for operational sea ice monitoring, L-band suits better for FYI, whereas C-band is still a better choice for MYI. In the warming Arctic, where FYI has become the dominant ice type, L-band demonstrates promise to be the optimal choice for sea ice operational monitoring with high spatiotemporal data acquisition from existing, upcoming and proposed L-band SAR missions. © 2020
英文关键词	Arctic; L-band; SAR; Sea ice; Thermodynamics
语种	英语
scopus关键词	Backscattering; Data acquisition; Meteorological instruments; Radar imaging; Stream flow; Synthetic aperture radar; ALOS PALSAR; Arctic sea ice; Ice break-up; Ice monitoring; Operational monitoring; Optimal choice; Scatterometer data; Spatio-temporal data; Sea ice; ALOS; data acquisition; PALSAR; QuikSCAT; radar imagery; RADARSAT; scatterometer; sea ice; seasonal variation; synthetic aperture radar; time series; Arctic
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179131
作者单位	University of Calgary, Calgary, AB, Canada; University of Manitoba, Winnipeg, MB, Canada; Environment and Climate Change Canada, Toronto, ON, Canada
推荐引用方式 GB/T 7714	Mahmud M.S.,Nandan V.,Howell S.E.L.,et al. Seasonal evolution of L-band SAR backscatter over landfast Arctic sea ice[J],2020,251.
APA	Mahmud M.S.,Nandan V.,Howell S.E.L.,Geldsetzer T.,&Yackel J..(2020).Seasonal evolution of L-band SAR backscatter over landfast Arctic sea ice.Remote Sensing of Environment,251.
MLA	Mahmud M.S.,et al."Seasonal evolution of L-band SAR backscatter over landfast Arctic sea ice".Remote Sensing of Environment 251(2020).