DOI: 10.5194/tc-10-3021-2016
Scopus记录号: 2-s2.0-85006375528
论文题名: Circumpolar polynya regions and ice production in the Arctic: Results from MODIS thermal infrared imagery from 2002/2003 to 2014/2015 with a regional focus on the Laptev Sea
作者: Preußer A ; , Heinemann G ; , Willmes S ; , Paul S
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 6 起始页码: 3021
结束页码: 3042
语种: 英语
英文关键词: atmosphere-ice-ocean system
; cloud
; energy balance
; ice field
; ice thickness
; ice-ocean interaction
; infrared imagery
; MODIS
; polynya
; satellite data
; spatiotemporal analysis
; Arctic Ocean
; Arkhangelsk [Russian Federation]
; Canada
; Canadian Arctic
; Chukchi Sea
; Kara Sea
; Laptev Sea
; Novaya Zemlya
; Russian Federation
英文摘要: High-resolution MODIS thermal infrared satellite data are used to infer spatial and temporal characteristics of 17 prominent coastal polynya regions over the entire Arctic basin. Thin-ice thickness (TIT) distributions (≤ 20cm) are calculated from MODIS ice-surface temperatures, combined with ECMWF ERA-Interim atmospheric reanalysis data in an energy balance model for 13 winter seasons (2002/2003 to 2014/2015; November to March). From all available MODIS swath data, daily thin-ice thickness composites are computed in order to derive quantities such as polynya area and total thermodynamic (i.e., potential) ice production. A gap-filling approach is applied to account for cloud and data gaps in the MODIS composites. All polynya regions combined cover an average thin-ice area of 226.6 ± 36.1 × 103km2 in winter. This allows for an average total winter-accumulated ice production of about 1811 ± 293km3, whereby the Kara Sea region, the North Water polynya (both 15%), polynyas on the western side of Novaya Zemlya (20%), as well as scattered smaller polynyas in the Canadian Arctic Archipelago (all combined 12%) are the main contributors. Other well-known sites of polynya formation (Laptev Sea, Chukchi Sea) show smaller contributions and range between 2 and 5%. We notice distinct differences to earlier studies on pan-Arctic polynya characteristics, originating in some part from the use of high-resolution MODIS data, as the capability to resolve small-scale (> 2km) polynyas and also large leads are increased. Despite the short record of 13 winter seasons, positive trends in ice production are detected for several regions of the eastern Arctic (most significantly in the Laptev Sea region with an increase of 6.8km3yrĝ1) and the North Water polynya, while other polynyas in the western Arctic show a more pronounced variability with varying trends. We emphasize the role of the Laptev Sea polynyas as being a major influence on Transpolar Drift characteristics through a distinct relation between increasing ice production and ice area export. Overall, our study presents a spatially highly accurate characterization of circumpolar polynya dynamics and ice production, which should be valuable for future modeling efforts of atmosphere-ice-ocean interactions in the Arctic. © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75024
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, Fac. of Regional and Environmental Sciences, University of Trier, Behringstr. 21, Trier, Germany; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, Bremerhaven, Germany
Recommended Citation:
Preußer A,, Heinemann G,, Willmes S,et al. Circumpolar polynya regions and ice production in the Arctic: Results from MODIS thermal infrared imagery from 2002/2003 to 2014/2015 with a regional focus on the Laptev Sea[J]. Cryosphere,2016-01-01,10(6)