气候变化领域集成服务门户(CCPortal): Fram Strait sea ice export variability and September Arctic sea ice extent over the last 80 years

CCPortal

DOI	10.5194/tc-11-65-2017
	Fram Strait sea ice export variability and September Arctic sea ice extent over the last 80 years
	Smedsrud L.H.; Halvorsen M.H.; Stroeve J.C.; Zhang R.; Kloster K.
发表日期	2017
ISSN	19940416
卷号	11 期号:1
英文摘要	A new long-term data record of Fram Strait sea ice area export from 1935 to 2014 is developed using a combination of satellite radar images and station observations of surface pressure across Fram Strait. This data record shows that the long-term annual mean export is about 880 000 km2, representing 10 % of the sea-ice-covered area inside the basin. The time series has large interannual and multi-decadal variability but no long-term trend. However, during the last decades, the amount of ice exported has increased, with several years having annual ice exports that exceeded 1 million km2. This increase is a result of faster southward ice drift speeds due to stronger southward geostrophic winds, largely explained by increasing surface pressure over Greenland. Evaluating the trend onwards from 1979 reveals an increase in annual ice export of about +6 % per decade, with spring and summer showing larger changes in ice export (+11 % per decade) compared to autumn and winter (+2.6 % per decade). Increased ice export during winter will generally result in new ice growth and contributes to thinning inside the Arctic Basin. Increased ice export during summer or spring will, in contrast, contribute directly to open water further north and a reduced summer sea ice extent through the ice-albedo feedback. Relatively low spring and summer export from 1950 to 1970 is thus consistent with a higher mid-September sea ice extent for these years. Our results are not sensitive to long-term change in Fram Strait sea ice concentration. We find a general moderate influence between export anomalies and the following September sea ice extent, explaining 18 % of the variance between 1935 and 2014, but with higher values since 2004. © 2017 Author(s).
学科领域	albedo; annual variation; concentration (composition); ice drift; ice margin; ice movement; open water; satellite imagery; sea ice; surface pressure; Arctic; Fram Strait
语种	英语
scopus关键词	albedo; annual variation; concentration (composition); ice drift; ice margin; ice movement; open water; satellite imagery; sea ice; surface pressure; Arctic; Fram Strait
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/119465
作者单位	Geophysical Institute, University of Bergen, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway; University Centre in Svalbard, Longyearbyen, Norway; National Snow and Ice Data Centre, University of Colorado, Boulder, United States; Centre for Polar Observation and Modelling, University College London, London, United Kingdom; Geophysical Fluid Dynamics Laboratory, National Oceanic and Atmospheric Administration, Princeton, NJ, United States; Nansen Environmental and Remote Sensing Center, Bergen, Norway
推荐引用方式 GB/T 7714	Smedsrud L.H.,Halvorsen M.H.,Stroeve J.C.,et al. Fram Strait sea ice export variability and September Arctic sea ice extent over the last 80 years[J],2017,11(1).
APA	Smedsrud L.H.,Halvorsen M.H.,Stroeve J.C.,Zhang R.,&Kloster K..(2017).Fram Strait sea ice export variability and September Arctic sea ice extent over the last 80 years.Cryosphere,11(1).
MLA	Smedsrud L.H.,et al."Fram Strait sea ice export variability and September Arctic sea ice extent over the last 80 years".Cryosphere 11.1(2017).