气候变化领域集成服务门户(CCPortal): The impact of heterogeneous surface temperatures on the 2-m air temperature over the arctic ocean under clear skies in spring

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DOI	10.5194/tc-7-153-2013
	The impact of heterogeneous surface temperatures on the 2-m air temperature over the arctic ocean under clear skies in spring
	Tetzlaff A.; Kaleschke L.; Lüpkes C.; Ament F.; Vihma T.
发表日期	2013
ISSN	19940416
卷号	7 期号:1
英文摘要	The influence of spatial surface temperature changes over the Arctic Ocean on the 2-m air temperature variability is estimated using backward trajectories based on ERA-Interim and JRA25 wind fields. They are initiated at Alert, Barrow and at the Tara drifting station. Three different methods are used. The first one compares mean ice surface temperatures along the trajectories to the observed 2-m air temperatures at the stations. The second one correlates the observed temperatures to air temperatures obtained using a simple Lagrangian box model that only includes the effect of sensible heat fluxes. For the third method, mean sensible heat fluxes from the model are correlated with the difference of the air temperatures at the model starting point and the observed temperatures at the stations. The calculations are based on MODIS ice surface temperatures and four different sets of ice concentration derived from SSM/I (Special Sensor Microwave Imager) and AMSR-E (Advanced Microwave Scanning Radiometer for EOS) data. Under nearly cloud-free conditions, up to 90% of the 2-m air temperature variance can be explained for Alert, and 70% for Barrow, using these methods. The differences are attributed to the different ice conditions, which are characterized by high ice concentration around Alert and lower ice concentration near Barrow. These results are robust for the different sets of reanalyses and ice concentration data. Trajectories based on 10-m wind fields from both reanalyses show large spatial differences in the Central Arctic, leading to differences in the correlations between modeled and observed 2-m air temperatures. They are most pronounced at Tara, where explained variances amount to 70% using JRA and 80% using ERA. The results also suggest that near-surface temperatures at a given site are influenced by the variability of surface temperatures in a domain of about 200 km radius around the site. © Author(s) 2013.
学科领域	air temperature; AMSR-E; clear sky; heterogeneity; MODIS; sensible heat flux; spring (season); surface temperature; wind field; Alaska; Alert; Arctic Ocean; Barrow; Canada; Ellesmere Island; Nunavut; Queen Elizabeth Islands; United States
语种	英语
scopus关键词	air temperature; AMSR-E; clear sky; heterogeneity; MODIS; sensible heat flux; spring (season); surface temperature; wind field; Alaska; Alert; Arctic Ocean; Barrow; Canada; Ellesmere Island; Nunavut; Queen Elizabeth Islands; United States
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/120306
作者单位	Institute of Oceanography, University of Hamburg, Germany; Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany; Institute of Meteorology, University of Hamburg, Germany; Finnish Meteorological Institute, Helsinki, Finland
推荐引用方式 GB/T 7714	Tetzlaff A.,Kaleschke L.,Lüpkes C.,et al. The impact of heterogeneous surface temperatures on the 2-m air temperature over the arctic ocean under clear skies in spring[J],2013,7(1).
APA	Tetzlaff A.,Kaleschke L.,Lüpkes C.,Ament F.,&Vihma T..(2013).The impact of heterogeneous surface temperatures on the 2-m air temperature over the arctic ocean under clear skies in spring.Cryosphere,7(1).
MLA	Tetzlaff A.,et al."The impact of heterogeneous surface temperatures on the 2-m air temperature over the arctic ocean under clear skies in spring".Cryosphere 7.1(2013).