气候变化领域集成服务门户(CCPortal): Atmosphere-ice forcing in the transpolar drift stream: Results from the DAMOCLES ice-buoy campaigns 2007

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DOI	10.5194/tc-8-275-2014
	Atmosphere-ice forcing in the transpolar drift stream: Results from the DAMOCLES ice-buoy campaigns 2007-2009
	Haller M.; Brümmer B.; Müller G.
发表日期	2014
ISSN	19940416
卷号	8 期号:1
英文摘要	During the EU research project Developing Arctic Modelling and Observing Capabilities for Long-term Environmental Studies (DAMOCLES), 18 ice buoys were deployed in the region of the Arctic transpolar drift (TPD). Sixteen of them formed a quadratic grid with 400 km side length. The measurements lasted from 2007 to 2009. The properties of the TPD and the impact of synoptic weather systems on the ice drift are analysed. Within the TPD, the speed increases by a factor of almost three from the North Pole to the Fram Strait region. The hourly buoy position fixes would show that the speed is underestimated by 10-20% if positions were taken at only 1-3 day intervals as it is usually done for satellite drift estimates. The geostrophic wind factor Ui / Ug (i.e. the ratio of ice speed Ui and geostrophic wind speed Ug), in the TPD amounts to 0.012 on average, but with regional and seasonal differences. The constant Ui / Ug relation breaks down for Ug < 5 m s-1. The impact of synoptic weather systems is studied applying a composite method. Cyclones (anticyclones) cause cyclonic (anticyclonic) vorticity and divergence (convergence) of the ice drift. The amplitudes are twice as large for cyclones as for anticyclones. The divergence caused by cyclones corresponds to a 0.1-0.5% per 6 h open water area increase based on the composite averages, but reached almost 4% within one day during a strong August 2007 storm. This storm also caused a long-lasting (over several weeks) rise of Ui and Ui / Ug and changed the ice conditions in a way which allowed large amplitudes of inertial ice motion. The consequences of an increasing Arctic storm activity for the ice cover are discussed. © Author(s) 2014.
学科领域	air-ice interaction; amplitude; anticyclone; buoy system; geostrophic flow; ice drift; ice movement; satellite data; vorticity; wind velocity; Arctic; Fram Strait; North Pole
语种	英语
scopus关键词	air-ice interaction; amplitude; anticyclone; buoy system; geostrophic flow; ice drift; ice movement; satellite data; vorticity; wind velocity; Arctic; Fram Strait; North Pole
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/120153
作者单位	Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, Germany; Meteorological Institute, University of Hamburg, Hamburg, Germany
推荐引用方式 GB/T 7714	Haller M.,Brümmer B.,Müller G.. Atmosphere-ice forcing in the transpolar drift stream: Results from the DAMOCLES ice-buoy campaigns 2007-2009[J],2014,8(1).
APA	Haller M.,Brümmer B.,&Müller G..(2014).Atmosphere-ice forcing in the transpolar drift stream: Results from the DAMOCLES ice-buoy campaigns 2007–2009.Cryosphere,8(1).
MLA	Haller M.,et al."Atmosphere-ice forcing in the transpolar drift stream: Results from the DAMOCLES ice-buoy campaigns 2007–2009".Cryosphere 8.1(2014).