气候变化领域集成服务门户(CCPortal): Characterization of L-band synthetic aperture radar (SAR) backscatter from floating and grounded thermokarst lake ice in Arctic Alaska

CCPortal

DOI	10.5194/tc-7-1741-2013
	Characterization of L-band synthetic aperture radar (SAR) backscatter from floating and grounded thermokarst lake ice in Arctic Alaska
	Engram M.; Anthony K.W.; Meyer F.J.; Grosse G.
发表日期	2013
ISSN	19940416
卷号	7 期号:6
英文摘要	Radar remote sensing is a well-established method to discriminate lakes retaining liquid-phase water beneath winter ice cover from those that do not. L-band (23.6 cm wavelength) airborne radar showed great promise in the 1970s, but spaceborne synthetic aperture radar (SAR) studies have focused on C-band (5.6 cm) SAR to classify lake ice with no further attention to L-band SAR for this purpose. Here, we examined calibrated L-band single- and quadrature-polarized SAR returns from floating and grounded lake ice in two regions of Alaska: the northern Seward Peninsula (NSP) where methane ebullition is common in lakes and the Arctic Coastal Plain (ACP) where ebullition is relatively rare. We found average backscatter intensities of -13 dB and -16 dB for late winter floating ice on the NSP and ACP, respectively, and -19 dB for grounded ice in both regions. Polarimetric analysis revealed that the mechanism of L-band SAR backscatter from floating ice is primarily roughness at the ice-water interface. L-band SAR showed less contrast between floating and grounded lake ice than C-band; however, since L-band is sensitive to ebullition bubbles trapped by lake ice (bubbles increase backscatter), this study helps elucidate potential confounding factors of grounded ice in methane studies using SAR. © 2013 Author(s). CC Attribution 3.0 License.
学科领域	backscatter; calibration; coastal plain; cryosphere; ice cover; methane; remote sensing; synthetic aperture radar; thermokarst; Alaska; Arctic Coastal Plain; Seward Peninsula; United States
语种	英语
scopus关键词	backscatter; calibration; coastal plain; cryosphere; ice cover; methane; remote sensing; synthetic aperture radar; thermokarst; Alaska; Arctic Coastal Plain; Seward Peninsula; United States
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/120234
作者单位	Water and Environmental Research Center, Institute of Northern Engineering, University of Alaska Fairbanks, 306 Tanana Loop, Fairbanks, AK 99775-7000, United States; Earth and Planetary Remote Sensing, Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Dr., Fairbanks, AK 99775-7000, United States; Permafrost Laboratory, Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Dr., Fairbanks, AK 99775-7000, United States
推荐引用方式 GB/T 7714	Engram M.,Anthony K.W.,Meyer F.J.,et al. Characterization of L-band synthetic aperture radar (SAR) backscatter from floating and grounded thermokarst lake ice in Arctic Alaska[J],2013,7(6).
APA	Engram M.,Anthony K.W.,Meyer F.J.,&Grosse G..(2013).Characterization of L-band synthetic aperture radar (SAR) backscatter from floating and grounded thermokarst lake ice in Arctic Alaska.Cryosphere,7(6).
MLA	Engram M.,et al."Characterization of L-band synthetic aperture radar (SAR) backscatter from floating and grounded thermokarst lake ice in Arctic Alaska".Cryosphere 7.6(2013).