DOI: 10.1007/s00382-015-2673-3
Scopus记录号: 2-s2.0-84930362441
论文题名: Arctic sea ice in the global eddy-permitting ocean reanalysis ORAP5
作者: Tietsche S. ; Balmaseda M.A. ; Zuo H. ; Mogensen K.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期: 3 起始页码: 775
结束页码: 789
语种: 英语
英文关键词: Arctic
; Ocean reanalysis
; Sea ice
英文摘要: We discuss the state of Arctic sea ice in the global eddy-permitting ocean reanalysis Ocean ReAnalysis Pilot 5 (ORAP5). Among other innovations, ORAP5 now assimilates observations of sea ice concentration using a univariate 3DVar-FGAT scheme. We focus on the period 1993–2012 and emphasize the evaluation of model performance with respect to recent observations of sea ice thickness. We find that sea ice concentration in ORAP5 is close to assimilated observations, with root mean square analysis residuals of less than 5 % in most regions. However, larger discrepancies exist for the Labrador Sea and east of Greenland during winter owing to biases in the free-running model. Sea ice thickness is evaluated against three different observational data sets that have sufficient spatial and temporal coverage: ICESat, IceBridge and SMOSIce. Large-scale features like the gradient between the thickest ice in the Canadian Arctic and thinner ice in the Siberian Arctic are simulated well by ORAP5. However, some biases remain. Of special note is the model’s tendency to accumulate too thick ice in the Beaufort Gyre. The root mean square error of ORAP5 sea ice thickness with respect to ICESat observations is 1.0 m, which is on par with the well-established PIOMAS model sea ice reconstruction. Interannual variability and trend of sea ice volume in ORAP5 also compare well with PIOMAS and ICESat estimates. We conclude that, notwithstanding a relatively simple sea ice data assimilation scheme, the overall state of Arctic sea ice in ORAP5 is in good agreement with observations and will provide useful initial conditions for predictions. © 2015, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53106
Appears in Collections: 过去全球变化的重建
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作者单位: NCAS-Climate/Department of Meteorology, University of Reading, Reading, United Kingdom; European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom
Recommended Citation:
Tietsche S.,Balmaseda M.A.,Zuo H.,et al. Arctic sea ice in the global eddy-permitting ocean reanalysis ORAP5[J]. Climate Dynamics,2017-01-01,49(3)