DOI: 10.5194/tc-14-1971-2020
论文题名: Changes of the Arctic marginal ice zone during the satellite era
作者: Rolph R.J. ; Feltham D.L. ; Schröder D.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 6 起始页码: 1971
结束页码: 1984
语种: 英语
英文关键词: alga
; bird
; concentration (composition)
; gas exchange
; heat transfer
; ice-ocean interaction
; marginal ice zone
; mixed layer
; pinniped
; satellite data
; sea ice
; Arctic
; algae
; Aves
英文摘要: Many studies have shown a decrease in Arctic sea ice extent. It does not logically follow, however, that the extent of the marginal ice zone (MIZ), here defined as the area of the ocean with ice concentrations from 15% to 80 %, is also changing. Changes in the MIZ extent has implications for the level of atmospheric and ocean heat and gas exchange in the area of partially ice-covered ocean and for the extent of habitat for organisms that rely on the MIZ, from primary producers like sea ice algae to seals and birds. Here, we present, for the first time, an analysis of satellite observations of pan-Arctic averaged MIZ extent. We find no trend in the MIZ extent over the last 40 years from observations. Our results indicate that the constancy of the MIZ extent is the result of an observed increase in width of the MIZ being compensated for by a decrease in the perimeter of the MIZ as it moves further north.We present simulations from a coupled sea ice-ocean mixed layer model using a prognostic floe size distribution, which we find is consistent with, but poorly constrained by, existing satellite observations of pan-Arctic MIZ extent.We provide seasonal upper and lower bounds on MIZ extent based on the four satellite-derived sea ice concentration datasets used. We find a large and significant increase ( > 50 %) in the August and September MIZ fraction (MIZ extent divided by sea ice extent) for the Bootstrap and OSI-450 observational datasets, which can be attributed to the reduction in total sea ice extent. Given the results of this study, we suggest that references to "rapid changes" in the MIZ should remain cautious and provide a specific and clear definition of both the MIZ itself and also the property of the MIZ that is changing. © Author(s) 2020. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164569
Appears in Collections: 气候变化与战略
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作者单位: Centre for Polar Observation and Modelling, Department of Meteorology, University of Reading, Reading, RG6 6BB, United Kingdom; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
Recommended Citation:
Rolph R.J.,Feltham D.L.,Schröder D.. Changes of the Arctic marginal ice zone during the satellite era[J]. Cryosphere,2020-01-01,14(6)