globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-014-2051-6
Scopus ID: 2-s2.0-84892897418
A systematic approach to identify the sources of tropical SST errors in coupled models using the adjustment of initialised experiments
Author: Vannière B.; Guilyardi E.; Toniazzo T.; Madec G.; Woolnough S.
Source Publication: Climate Dynamics
ISSN: 9307575
Publishing Year: 2014
Volume: 43, Issue:2017-07-08
pages begin: 2261
pages end: 2282
Language: 英语
Keyword: CGCMs errors ; Cold tongue bias ; Seasonal forecasts ; Tropical Pacific
English Abstract: Understanding the sources of systematic errors in climate models is challenging because of coupled feedbacks and errors compensation. The developing seamless approach proposes that the identification and the correction of short term climate model errors have the potential to improve the modeled climate on longer time scales. In previous studies, initialised atmospheric simulations of a few days have been used to compare fast physics processes (convection, cloud processes) among models. The present study explores how initialised seasonal to decadal hindcasts (re-forecasts) relate transient week-to-month errors of the ocean and atmospheric components to the coupled model long-term pervasive SST errors. A protocol is designed to attribute the SST biases to the source processes. It includes five steps: (1) identify and describe biases in a coupled stabilized simulation, (2) determine the time scale of the advent of the bias and its propagation, (3) find the geographical origin of the bias, (4) evaluate the degree of coupling in the development of the bias, (5) find the field responsible for the bias. This strategy has been implemented with a set of experiments based on the initial adjustment of initialised simulations and exploring various degrees of coupling. In particular, hindcasts give the time scale of biases advent, regionally restored experiments show the geographical origin and ocean-only simulations isolate the field responsible for the bias and evaluate the degree of coupling in the bias development. This strategy is applied to four prominent SST biases of the IPSLCM5A-LR coupled model in the tropical Pacific, that are largely shared by other coupled models, including the Southeast Pacific warm bias and the equatorial cold tongue bias. Using the proposed protocol, we demonstrate that the East Pacific warm bias appears in a few months and is caused by a lack of upwelling due to too weak meridional coastal winds off Peru. The cold equatorial bias, which surprisingly takes 30 years to develop, is the result of an equatorward advection of midlatitude cold SST errors. Despite large development efforts, the current generation of coupled models shows only little improvement. The strategy proposed in this study is a further step to move from the current random ad hoc approach, to a bias-targeted, priority setting, systematic model development approach. © 2014, Springer-Verlag Berlin Heidelberg.
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被引频次[WOS]:21   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:过去全球变化的重建

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Affiliation: Laboratoire d’Océanographie et du Climat, Expérimentations et approches numériques, Institut Pierre Simon Laplace, Unité Mixte de Recherche 7159 CNRS / IRD/Universit Pierre et Marie Curie/MNHN, Boîte 100-4, Place Jussieu, Paris Cedex 05, France; NCAS-Climate, Department of Meteorology, University of Reading, Reading, United Kingdom

Recommended Citation:
Vannière B.,Guilyardi E.,Toniazzo T.,et al. A systematic approach to identify the sources of tropical SST errors in coupled models using the adjustment of initialised experiments[J]. Climate Dynamics,2014-01-01,43(2017-07-08)
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