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Process-level improvements in CMIP5 models and their impact on Southern Ocean, Monsoon, and cloud climatology performance

Lauer, Axel and Eyring, Veronika and Jones, Colin and Evaldsson, Martin and Hagemann, Stefan and Martin, Gill and Roehrig, Romain (2016) Process-level improvements in CMIP5 models and their impact on Southern Ocean, Monsoon, and cloud climatology performance. CFMIP/WCRP/ITCP Conference on Cloud Processes, Circulation and Climate Sensitivity, July 4-7, 2016, Trieste, Italy.

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The performance of 4 improved European climate models from the CNRM, EC-Earth, HadGEM, and MPI-ESM families is assessed in comparison to their predecessor versions used in the 5th Coupled Model Intercomparison Project (CMIP5). The ESMValTool (Eyring et al., 2016) is applied to evaluate a range of variables and climate phenomena in the models against a suite of observations. Analyzed simulations include AMIP-style experiments, with prescribed sea surface temperatures, as well as fully coupled experiments (historical runs). The study focuses on a number of key processes/variables that are known to exhibit systematic biases in present-day GCMs. These include: (a) Southern Ocean clouds and radiation, (b) The South Asian and West African monsoons, and (c) The global cloud climatology and cloud radiative forcing. The main aim is to quantify and document improvements made as a result of model development efforts over the period of the EU FP7 project EMBRACE. The analysis shows that the tropical precipitation in most models is significantly improved, which can be partly attributed to improved representation of convective precipitation in the models. Cloud amounts and simulated cloud-radiation interactions were also quite significantly improved over the Southern Ocean (latitude band 30°S to 65°S), although problems do still exist in the latitude band 50°S to 65°S. The simulated global cloud climatology, however, did not improve significantly. An amplified underestimate of the cloud liquid water path in tropical regions suggests that efficiency of convective precipitation formation is overestimated in some models. Some improvement was seen in the simulation of the South Asian and West African monsoons, although large systematic biases remain in regional details of precipitation and the overall timing of monsoon rainfall.

Item URL in elib:https://elib.dlr.de/105147/
Document Type:Conference or Workshop Item (Poster)
Title:Process-level improvements in CMIP5 models and their impact on Southern Ocean, Monsoon, and cloud climatology performance
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lauer, AxelDLR, IPAhttps://orcid.org/0000-0002-9270-1044
Jones, ColinUniversity of LeedsUNSPECIFIED
Evaldsson, MartinSMHI, SwedenUNSPECIFIED
Hagemann, StefanMax Planck Institute for MeteorologyUNSPECIFIED
Martin, GillMet Office Hadley CentreUNSPECIFIED
Roehrig, RomainCNRM-GAME, Meteo France and CNRSUNSPECIFIED
Date:5 July 2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:EMBRACE, clouds, precipitation, CMIP5, ESMValTool
Event Title:CFMIP/WCRP/ITCP Conference on Cloud Processes, Circulation and Climate Sensitivity
Event Location:Trieste, Italy
Event Type:international Conference
Event Dates:July 4-7, 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Lauer, Axel
Deposited On:12 Jul 2016 10:59
Last Modified:12 Jul 2016 10:59

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