DOI: 10.5194/tc-9-2027-2015
Scopus记录号: 2-s2.0-84946735967
论文题名: Long-term coastal-polynya dynamics in the southern Weddell Sea from MODIS thermal-infrared imagery
作者: Paul S ; , Willmes S ; , Heinemann G
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 6 起始页码: 2027
结束页码: 2041
语种: 英语
英文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75232
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Environmental Meteorology, University of Trier, Trier, Germany
Recommended Citation:
Paul S,, Willmes S,, Heinemann G. Long-term coastal-polynya dynamics in the southern Weddell Sea from MODIS thermal-infrared imagery[J]. Cryosphere,2015-01-01,9(6)