气候变化领域集成服务门户(CCPortal): Long-term coastal-polynya dynamics in the southern Weddell Sea from MODIS thermal-infrared imagery

CCPortal

DOI	10.5194/tc-9-2027-2015
	Long-term coastal-polynya dynamics in the southern Weddell Sea from MODIS thermal-infrared imagery
	Paul S.; Willmes S.; Heinemann G.
发表日期	2015
ISSN	19940416
卷号	9 期号:6
英文摘要	Based upon thermal-infrared satellite imagery in combination with ERA-Interim atmospheric reanalysis data, we derive long-term polynya characteristics such as polynya area, thin-ice thickness distribution, and ice-production rates for a 13-year investigation period (2002-2014) for the austral winter (1 April to 30 September) in the Antarctic southern Weddell Sea. All polynya parameters are derived from daily cloud-cover corrected thin-ice thickness composites. The focus lies on coastal polynyas which are important hot spots for new-ice formation, bottom-water formation, and heat/moisture release into the atmosphere. MODIS has the capability to resolve even very narrow coastal polynyas. Its major disadvantage is the sensor limitation due to cloud cover. We make use of a newly developed and adapted spatial feature reconstruction scheme to account for cloud-covered areas. We find the sea-ice areas in front of the Ronne and Brunt ice shelves to be the most active with an annual average polynya area of 3018 ± 1298 and 3516 ± 1420 km2 as well as an accumulated volume ice production of 31 ± 13 and 31 ± 12 km3, respectively. For the remaining four regions, estimates amount to 421 ± 294 km2 and 4 ± 3 km3 (Antarctic Peninsula), 1148 ± 432 km2 and 12 ± 5 km3 (iceberg A23A), 901 ± 703 km2 and 10 ± 8 km3 (Filchner Ice Shelf), as well as 499 ± 277 km2 and 5 ± 2 km3 (Coats Land). Our findings are discussed in comparison to recent studies based on coupled sea-ice/ocean models and passive-microwave satellite imagery, each investigating different parts of the southern Weddell Sea. © Author(s) 2015.
学科领域	cloud cover; ice shelf; ice thickness; infrared imagery; microwave imagery; MODIS; reconstruction; satellite imagery; sea ice; sensor; spatiotemporal analysis; Antarctic Peninsula; Antarctica; Southern Ocean; Weddell Sea; West Antarctica
语种	英语
scopus关键词	cloud cover; ice shelf; ice thickness; infrared imagery; microwave imagery; MODIS; reconstruction; satellite imagery; sea ice; sensor; spatiotemporal analysis; Antarctic Peninsula; Antarctica; Southern Ocean; Weddell Sea; West Antarctica
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/119790
作者单位	Department of Environmental Meteorology, University of Trier, Trier, Germany
推荐引用方式 GB/T 7714	Paul S.,Willmes S.,Heinemann G.. Long-term coastal-polynya dynamics in the southern Weddell Sea from MODIS thermal-infrared imagery[J],2015,9(6).
APA	Paul S.,Willmes S.,&Heinemann G..(2015).Long-term coastal-polynya dynamics in the southern Weddell Sea from MODIS thermal-infrared imagery.Cryosphere,9(6).
MLA	Paul S.,et al."Long-term coastal-polynya dynamics in the southern Weddell Sea from MODIS thermal-infrared imagery".Cryosphere 9.6(2015).