气候变化领域集成服务门户(CCPortal): About the consistency between Envisat and CryoSat-2 radar freeboard retrieval over Antarctic sea ice

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DOI	10.5194/tcd-9-4893-2015
	About the consistency between Envisat and CryoSat-2 radar freeboard retrieval over Antarctic sea ice
	Schwegmann S.; Rinne E.; Ricker R.; Hendricks S.; Helm V.
发表日期	2015
ISSN	19940432
卷号	9 期号:5
英文摘要	Knowledge about Antarctic sea-ice volume and its changes over the past decades has been sparse due to the lack of systematic sea-ice thickness measurements in this remote area. Recently, first attempts have been made to develop a sea-ice thickness product over the Southern Ocean from space-borne radar altimetry and results look promising. Today, more than 20 years of radar altimeter data are potentially available for such products. However, data come from different sources, and the characteristics of individual sensors differ. Hence, it is important to study the consistency between single sensors in order to develop long and consistent time series over the potentially available measurement period. Here, the consistency between freeboard measurements of the Radar Altimeter 2 on-board Envisat and freeboard measurements from the Synthetic-Aperture Interferometric Radar Altimeter on-board CryoSat-2 is tested for their overlap period in 2011. Results indicate that mean and modal values are comparable over the sea-ice growth season (May-October) and partly also beyond. In general, Envisat data shows higher freeboards in the seasonal ice zone while CryoSat-2 freeboards are higher in the perennial ice zone and near the coasts. This has consequences for the agreement in individual sectors of the Southern Ocean, where one or the other ice class may dominate. Nevertheless, over the growth season, mean freeboard for the entire (regional separated) Southern Ocean differs generally by not more than 2 cm (5 cm, except for the Amundsen/Bellingshausen Sea) between Envisat and CryoSat-2, and the differences between modal freeboard lie generally within ±10 cm and often even below. © Author(s) 2015.
学科领域	CryoSat; Envisat; ice thickness; radar altimetry; satellite sensor; sea ice; Southern Ocean
语种	英语
scopus关键词	CryoSat; Envisat; ice thickness; radar altimetry; satellite sensor; sea ice; Southern Ocean
来源期刊	Cryosphere Discussions
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119816
作者单位	Alfred Wegener Institute, Helmholtz-Centre for Polar- and Marine Research, Am Handelshafen 12, Bremerhaven, 27570, Germany; Finnish Meteorological Institute, Marine Research, Erik Palménin aukio 1, Helsinki, 00560, Finland
推荐引用方式 GB/T 7714	Schwegmann S.,Rinne E.,Ricker R.,et al. About the consistency between Envisat and CryoSat-2 radar freeboard retrieval over Antarctic sea ice[J],2015,9(5).
APA	Schwegmann S.,Rinne E.,Ricker R.,Hendricks S.,&Helm V..(2015).About the consistency between Envisat and CryoSat-2 radar freeboard retrieval over Antarctic sea ice.Cryosphere Discussions,9(5).
MLA	Schwegmann S.,et al."About the consistency between Envisat and CryoSat-2 radar freeboard retrieval over Antarctic sea ice".Cryosphere Discussions 9.5(2015).