气候变化领域集成服务门户(CCPortal): Satellite passive microwave sea-ice concentration data set intercomparison: Closed ice and ship-based observations

CCPortal

DOI	10.5194/tc-13-3261-2019
	Satellite passive microwave sea-ice concentration data set intercomparison: Closed ice and ship-based observations
	Kern S.; Lavergne T.; Notz D.; Toudal Pedersen L.; Tage Tonboe R.; Saldo R.; Macdonald Sørensen A.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	3261
结束页码	3307
卷号	13 期号:12
英文摘要	We report on results of a systematic intercomparison of 10 global sea-ice concentration (SIC) data products at 12.5 to 50.0 km grid resolution for both the Arctic and the Antarctic. The products are compared with each other with respect to differences in SIC, sea-ice area (SIA), and sea-ice extent (SIE), and they are compared against a global wintertime near-100% reference SIC data set for closed pack ice conditions and against global year-round ship-based visual observations of the sea-ice cover. We can group the products based on the concept of their SIC retrieval algorithms. Group I consists of data sets using the selfoptimizing EUMETSAT OSI SAF and ESA CCI algorithms. Group II includes data using the Comiso bootstrap algorithm and the NOAA NSIDC sea-ice concentration climate data record (CDR). The standard NASA Team and the ARTIST Sea Ice (ASI) algorithms are put into group III, and NASA Team 2 is the only element of group IV. The three CDRs of group I (SICCI-25km, SICCI-50km, and OSI-450) are biased low compared to a 100% reference SIC data set with biases of-0:4% to-1:0% (Arctic) and-0:3% to-1:1% (Antarctic). Products of group II appear to be mostly biased high in the Arctic by between C1.0% and C3.5 %, while their biases in the Antarctic range from-0:2% to C0.9 %. Group III product biases are different for the Arctic, C0.9% (NASA Team) and-3:7% (ASI), but similar for the Antarctic,-5:4% and-5:6 %, respectively. The standard deviation is smaller in the Arctic for the quoted group I products (1.9%to 2.9 %) and Antarctic (2.5%to 3.1 %) than for group II and III products: 3.6% to 5.0% for the Arctic and 4.0% to 6.5% for the Antarctic. We refer to the paper to understand why we could not give values for group IV here. We discuss the impact of truncating the SIC distribution, as naturally retrieved by the algorithms around the 100% sea-ice concentration end. We show that evaluation studies of such truncated SIC products can result in misleading statistics and favour data sets that systematically overestimate SIC.We describe a method to reconstruct the non-truncated distribution of SIC before the evaluation is performed. On the basis of this evaluation, we open a discussion about the overestimation of SIC in data products, with far-reaching consequences for surface heat flux estimations in winter.We also document inconsistencies in the behaviour of the weather filters used in products of group II, and we suggest advancing studies about the influence of these weather filters on SIA and SIE time series and their trends. © 2019 Royal Society of Chemistry. All rights reserved.
学科领域	algorithm; bootstrapping; data set; heat flux; microwave radiometer; pack ice; satellite altimetry; sea ice; time series analysis; Antarctica; Arctic
语种	英语
scopus关键词	algorithm; bootstrapping; data set; heat flux; microwave radiometer; pack ice; satellite altimetry; sea ice; time series analysis; Antarctica; Arctic
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118796
作者单位	Integrated Climate Data Center (ICDC), Center for Earth System Research and Sustainability (CEN), University of Hamburg, Hamburg, Germany; Research and Development Department, Norwegian Meteorological Institute, Oslo, Norway; Institute for Marine Research, University of Hamburg and Max Planck Institute for Meteorology, Hamburg, Germany; Danish Technical University, Lyngby, Denmark; Danish Meteorological Institute, Copenhagen, Denmark
推荐引用方式 GB/T 7714	Kern S.,Lavergne T.,Notz D.,et al. Satellite passive microwave sea-ice concentration data set intercomparison: Closed ice and ship-based observations[J],2019,13(12).
APA	Kern S..,Lavergne T..,Notz D..,Toudal Pedersen L..,Tage Tonboe R..,...&Macdonald Sørensen A..(2019).Satellite passive microwave sea-ice concentration data set intercomparison: Closed ice and ship-based observations.The Cryosphere,13(12).
MLA	Kern S.,et al."Satellite passive microwave sea-ice concentration data set intercomparison: Closed ice and ship-based observations".The Cryosphere 13.12(2019).