DOI: 10.1007/s00382-016-3442-7
Scopus记录号: 2-s2.0-84996837052
论文题名: Accounting for observation uncertainties in an evaluation metric of low latitude turbulent air–sea fluxes: application to the comparison of a suite of IPSL model versions
作者: Servonnat J. ; Găinuşă-Bogdan A. ; Braconnot P.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期: 2017-05-06 起始页码: 2219
结束页码: 2235
语种: 英语
英文关键词: Climate model evaluation
; IPSL model
; Latent heat flux
; Metric
; Sensible heat flux
; Spatio-temporal variability
; Statistic
; Turbulent air–sea fluxes
; Uncertainty
; Wind stress
英文摘要: Turbulent momentum and heat (sensible heat and latent heat) fluxes at the air–sea interface are key components of the whole energetic of the Earth’s climate. The evaluation of these fluxes in the climate models is still difficult because of the large uncertainties associated with the reference products. In this paper we present an objective metric accounting for reference uncertainties to evaluate the annual cycle of the low latitude turbulent fluxes of a suite of IPSL climate models. This metric consists in a Hotelling T2 test between the simulated and observed field in a reduce space characterized by the dominant modes of variability that are common to both the model and the reference, taking into account the observational uncertainty. The test is thus more severe when uncertainties are small as it is the case for sea surface temperature (SST). The results of the test show that for almost all variables and all model versions the model-reference differences are not zero. It is not possible to distinguish between model versions for sensible heat and meridional wind stress, certainly due to the large observational uncertainties. All model versions share similar biases for the different variables. There is no improvement between the reference versions of the IPSL model used for CMIP3 and CMIP5. The test also reveals that the higher horizontal resolution fails to improve the representation of the turbulent surface fluxes compared to the other versions. The representation of the fluxes is further degraded in a version with improved atmospheric physics with an amplification of some of the biases in the Indian Ocean and in the intertropical convergence zone. The ranking of the model versions for the turbulent fluxes is not correlated with the ranking found for SST. This highlights that despite the fact that SST gradients are important for the large-scale atmospheric circulation patterns, other factors such as wind speed, and air–sea temperature contrast play an important role in the representation of turbulent fluxes. © 2016, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53096
Appears in Collections: 过去全球变化的重建
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作者单位: Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France; UMR CNRS 5805 Environnements et Paléoenvironnements Océaniques et Continentaux - OASU, Bordeaux, France
Recommended Citation:
Servonnat J.,Găinuşă-Bogdan A.,Braconnot P.. Accounting for observation uncertainties in an evaluation metric of low latitude turbulent air–sea fluxes: application to the comparison of a suite of IPSL model versions[J]. Climate Dynamics,2017-01-01,49(2017-05-06)