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Process-level improvements in CMIP5 models and their impact on tropical variability, Southern Ocean and monsoons

Lauer, Axel and Jones, Colin and Eyring, Veronika and Evaldsson, Martin and Hagemann, Stefan and Mäkelä, Jarmo and Martin, Gill and Roehrig, Romain and Wang, Shiyu (2018) Process-level improvements in CMIP5 models and their impact on tropical variability, Southern Ocean and monsoons. Earth System Dynamics (9), pp. 33-67. Copernicus Publications. DOI: 10.5194/esd-9-33-2018 ISSN 2190-4979

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Official URL: https://www.earth-syst-dynam.net/9/33/2018/

Abstract

The performance of updated versions of the four earth system models (ESMs) CNRM, EC-Earth, HadGEM, and MPI-ESM is assessed in comparison to their predecessor versions used in Phase 5 of the Coupled Model Intercomparison Project. The Earth System Model Evaluation Tool (ESMValTool) is applied to evaluate selected climate phenomena in the models against observations. This is the first systematic application of the ESMValTool to assess and document the progress made during an extensive model development and improvement project. This study focuses on the South Asian (SAM) and West African (WAM) monsoons, the coupled equatorial climate, and Southern Ocean clouds and radiation, which are known to exhibit systematic biases in present-day ESMs. The analysis shows that the tropical precipitation in three out of four models is clearly improved. Two of three updated coupled models show an improved representation of tropical sea surface temperatures with one coupled model not exhibiting a double Inter-Tropical Convergence Zone (ITCZ). Simulated cloud amounts and cloud-radiation interactions are improved over the Southern Ocean. Improvements are also seen in the simulation of the SAM and WAM, although systematic biases remain in regional details and the timing of monsoon rainfall. Analysis of simulations with EC-Earth at different horizontal resolutions from T159 up to T1279 shows that the synoptic-scale variability of precipitation over the SAM and WAM regions improves with higher model resolution. The results suggest the reasonably good agreement of modeled and observed mean WAM and SAM rainfall in lower resolution models may be a result of unrealistic intensity distributions.

Item URL in elib:https://elib.dlr.de/116614/
Document Type:Article
Title:Process-level improvements in CMIP5 models and their impact on tropical variability, Southern Ocean and monsoons
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lauer, AxelDLR, IPAhttps://orcid.org/0000-0002-9270-1044
Jones, ColinUniv. Leeds, UKUNSPECIFIED
Eyring, VeronikaDLR, IPAhttps://orcid.org/0000-0002-6887-4885
Evaldsson, MartinSMHI, Norrköping, SchwedenUNSPECIFIED
Hagemann, StefanMPI für Meteorologie, HamburgUNSPECIFIED
Mäkelä, JarmoFMI, Helsinki, FinnlandUNSPECIFIED
Martin, GillMetOffice, Exeter, UKUNSPECIFIED
Roehrig, RomainMétéo France and CNRS, Toulouse, FrankreichUNSPECIFIED
Wang, ShiyuSMHI, Norrköping, SchwedenUNSPECIFIED
Date:January 2018
Journal or Publication Title:Earth System Dynamics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.5194/esd-9-33-2018
Page Range:pp. 33-67
Publisher:Copernicus Publications
ISSN:2190-4979
Status:Published
Keywords:ESMValTool, CMIP, EMBRACE, climate model, bias
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Model Evaluation and Analysis
Deposited By: Lauer, Axel
Deposited On:05 Dec 2017 17:06
Last Modified:19 Nov 2018 10:29

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