气候变化领域集成服务门户(CCPortal): Empirical parametrization of envisat freeboard retrieval of arctic and antarctic sea ice based on CryoSat-2: Progress in the ESA climate change initiative

CCPortal

DOI	10.5194/tc-12-2437-2018
	Empirical parametrization of envisat freeboard retrieval of arctic and antarctic sea ice based on CryoSat-2: Progress in the ESA climate change initiative
	Paul S.; Hendricks S.; Ricker R.; Kern S.; Rinne E.
发表日期	2018
ISSN	19940416
卷号	12 期号:7
英文摘要	In order to derive long-term changes in sea-ice volume, a multi-decadal sea-ice thickness record is required. CryoSat-2 has showcased the potential of radar altimetry for sea-ice mass-balance estimation over the recent years. However, precursor altimetry missions such as Environmental Satellite (Envisat) have not been exploited to the same extent so far. Combining both missions to acquire a decadal sea-ice volume data set requires a method to overcome the discrepancies due to different footprint sizes from either pulse-limited or beam-sharpened radar echoes. In this study, we implemented an inter-mission-consistent surface-type classification scheme for both hemispheres, based on the waveform pulse peakiness, leading-edge width, and surface backscatter. In order to achieve a consistent retracking procedure, we adapted the threshold first-maximum retracker algorithm, previously used only for CryoSat-2, to develop an adaptive retracker threshold that depends on waveform characteristics. With our method, we produce a global and consistent freeboard data set for CryoSat-2 and Envisat. This novel data set features a maximum monthly difference in the mission-overlap period of 2.2cm (2.7cm) for the Arctic (Antarctic) based on all gridded values with spatial resolution of 25μkmμ × μ25μkm and 50μkmμ × μ50μkm for the Arctic and Antarctic, respectively. © Author(s) 2018.
学科领域	algorithm; climate change; continental freeboard; CryoSat; data set; empirical analysis; Envisat; ice thickness; parameterization; radar altimetry; sea ice; spatial resolution; waveform analysis; Arctic and Antarctic
语种	英语
scopus关键词	algorithm; climate change; continental freeboard; CryoSat; data set; empirical analysis; Envisat; ice thickness; parameterization; radar altimetry; sea ice; spatial resolution; waveform analysis; Arctic and Antarctic
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/119095
作者单位	Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Department of Geography, Ludwig-Maximilians-Universität, Munich, Germany; Integrated Climate Data Center, Hamburg, Germany; Finnish Meteorological Institute, Helsinki, Finland
推荐引用方式 GB/T 7714	Paul S.,Hendricks S.,Ricker R.,et al. Empirical parametrization of envisat freeboard retrieval of arctic and antarctic sea ice based on CryoSat-2: Progress in the ESA climate change initiative[J],2018,12(7).
APA	Paul S.,Hendricks S.,Ricker R.,Kern S.,&Rinne E..(2018).Empirical parametrization of envisat freeboard retrieval of arctic and antarctic sea ice based on CryoSat-2: Progress in the ESA climate change initiative.Cryosphere,12(7).
MLA	Paul S.,et al."Empirical parametrization of envisat freeboard retrieval of arctic and antarctic sea ice based on CryoSat-2: Progress in the ESA climate change initiative".Cryosphere 12.7(2018).