DOI: 10.1007/s00382-015-2675-1
Scopus记录号: 2-s2.0-84930355083
论文题名: The new eddy-permitting ORAP5 ocean reanalysis: description, evaluation and uncertainties in climate signals
作者: Zuo H. ; Balmaseda M.A. ; Mogensen K.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期: 3 起始页码: 791
结束页码: 811
语种: 英语
英文关键词: Ocean reanalyses
; Sea level
; Sensitivity experiment
英文摘要: A new eddy-permitting ocean reanalysis has been recently completed at ECMWF. It is called Ocean ReAnalysis Pilot 5 (ORAP5), and it spans the period 1979–2012. This work describes the new system, evaluates its performance, and investigates how the estimation of climate indices are affected by the assimilation system settings. ORAP5 introduces several upgrades with respect to its predecessor ORAS4, including increased horizontal and vertical resolution, an prognostic sea-ice component, new versions of the ocean and data assimilation system, revised surface fluxes, new version and treatment of satellite sea surface height data, and assimilation of sea-ice concentration, among others. ORAP5 shows similar performance to ORAS4, with improvements in the northern extratropics (especially in salinity), and slight degradation in the Southern Ocean, probably because the observations are insufficient to constrain the increased level of variability in ORAP5. The sensitivity experiments show that superobbing of altimeter data and correlation length-scales of the background errors have a visible impact on the time evolution of global steric height and its partition into thermo/halo-steric contributions. The sensitivities are especially large in the pre-Argo period, when there is the risk of producing unrealistic steric height variations by overfitting the altimeter data. Compared with a control run without data assimilation, all the assimilation experiments also show stronger variability in the halosteric component in the pre-Argo period. The results highlight the importance of sub-surface observations to assist the assimilation of altimeter data, and the need of using a variety of metrics for evaluating ocean reanalysis systems. © 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/53140
Appears in Collections: 过去全球变化的重建
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作者单位: European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom
Recommended Citation:
Zuo H.,Balmaseda M.A.,Mogensen K.. The new eddy-permitting ORAP5 ocean reanalysis: description, evaluation and uncertainties in climate signals[J]. Climate Dynamics,2017-01-01,49(3)