DOI: 10.5194/tc-15-821-2021
论文题名: Refining the sea surface identification approach for determining freeboards in the ICESat-2 sea ice products
作者: Kwok R. ; Petty A.A. ; Bagnardi M. ; Kurtz N.T. ; Cunningham G.F. ; Ivanoff A. ; Kacimi S.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 2 起始页码: 821
结束页码: 833
语种: 英语
英文关键词: algorithm
; ICESat
; sea ice
; sea surface height
; surface reflectance
; Arctic Ocean
; Southern Ocean
英文摘要: In Release 001 and 002 of the ICESat-2 sea ice products, candidate height segments used to estimate the reference sea surface height for freeboard calculations included two surface types: specular and smooth dark leads. We found that the uncorrected photon rates, used as proxies of surface reflectance, are attenuated due to clouds resulting in the potential misclassification of sea ice as dark leads, biasing the reference sea surface height relative to those derived from the more reliable specular returns. This results in higher reference sea surface heights and lower estimated ice freeboards. The resolution of available cloud flags from the ICESat-2 atmosphere data product is too coarse to provide useful filtering at the lead segment scale. In Release 003, we have modified the surface-reference-finding algorithm so that only specular leads are used. The consequence of this change can be seen in the composites of mean freeboard of the Arctic and Southern oceans. Broadly, coverages have decreased by ∼10-20% because there are fewer leads (by excluding the dark leads), and the composite means have increased by 0-4 cm because of the use of more consistent specular leads. © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164733
Appears in Collections: 气候变化与战略
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作者单位: Applied Physics Laboratory, Polar Science Center, University of Washington, Seattle, WA, United States; Goddard Space Flight Center, Greenbelt, MD, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; Adnet Systems Inc., Rockville, MD, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Kwok R.,Petty A.A.,Bagnardi M.,et al. Refining the sea surface identification approach for determining freeboards in the ICESat-2 sea ice products[J]. Cryosphere,2021-01-01,15(2)