DOI: 10.5194/tc-7-153-2013
Scopus记录号: 2-s2.0-84874349641
论文题名: The impact of heterogeneous surface temperatures on the 2-m air temperature over the arctic ocean under clear skies in spring
作者: Tetzlaff A ; , Kaleschke L ; , Lüpkes C ; , Ament F ; , Vihma T
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 1 起始页码: 153
结束页码: 166
语种: 英语
英文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74996
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: 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
Recommended Citation:
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]. Cryosphere,2013-01-01,7(1)