Process-level improvements in CMIP5 models and their impact on tropical variability, Southern Ocean and monsoons
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 evalu...
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ftdlr:oai:elib.dlr.de:116614 2023-12-03T10:30:34+01:00 Process-level improvements in CMIP5 models and their impact on tropical variability, Southern Ocean and monsoons Lauer, Axel Jones, Colin Eyring, Veronika Evaldsson, Martin Hagemann, Stefan Mäkelä, Jarmo Martin, Gill Roehrig, Romain Wang, Shiyu 2018-01 application/pdf https://elib.dlr.de/116614/ https://elib.dlr.de/116614/1/lauer-etal-esd-9-33-2018.pdf https://www.earth-syst-dynam.net/9/33/2018/ de ger Copernicus Publications https://elib.dlr.de/116614/1/lauer-etal-esd-9-33-2018.pdf Lauer, Axel und Jones, Colin und Eyring, Veronika und Evaldsson, Martin und Hagemann, Stefan und Mäkelä, Jarmo und Martin, Gill und Roehrig, Romain und Wang, Shiyu (2018) Process-level improvements in CMIP5 models and their impact on tropical variability, Southern Ocean and monsoons. Earth System Dynamics (9), Seiten 33-67. Copernicus Publications. doi:10.5194/esd-9-33-2018 <https://doi.org/10.5194/esd-9-33-2018>. ISSN 2190-4979. info:eu-repo/semantics/openAccess Erdsystemmodell -Evaluation und -Analyse Zeitschriftenbeitrag PeerReviewed info:eu-repo/semantics/article 2018 ftdlr https://doi.org/10.5194/esd-9-33-2018 2023-11-06T00:24:02Z 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. Article in Journal/Newspaper Southern Ocean German Aerospace Center: elib - DLR electronic library Southern Ocean Earth System Dynamics 9 1 33 67 |
institution |
Open Polar |
collection |
German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
German |
topic |
Erdsystemmodell -Evaluation und -Analyse |
spellingShingle |
Erdsystemmodell -Evaluation und -Analyse Lauer, Axel Jones, Colin Eyring, Veronika Evaldsson, Martin Hagemann, Stefan Mäkelä, Jarmo Martin, Gill Roehrig, Romain Wang, Shiyu Process-level improvements in CMIP5 models and their impact on tropical variability, Southern Ocean and monsoons |
topic_facet |
Erdsystemmodell -Evaluation und -Analyse |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Lauer, Axel Jones, Colin Eyring, Veronika Evaldsson, Martin Hagemann, Stefan Mäkelä, Jarmo Martin, Gill Roehrig, Romain Wang, Shiyu |
author_facet |
Lauer, Axel Jones, Colin Eyring, Veronika Evaldsson, Martin Hagemann, Stefan Mäkelä, Jarmo Martin, Gill Roehrig, Romain Wang, Shiyu |
author_sort |
Lauer, Axel |
title |
Process-level improvements in CMIP5 models and their impact on tropical variability, Southern Ocean and monsoons |
title_short |
Process-level improvements in CMIP5 models and their impact on tropical variability, Southern Ocean and monsoons |
title_full |
Process-level improvements in CMIP5 models and their impact on tropical variability, Southern Ocean and monsoons |
title_fullStr |
Process-level improvements in CMIP5 models and their impact on tropical variability, Southern Ocean and monsoons |
title_full_unstemmed |
Process-level improvements in CMIP5 models and their impact on tropical variability, Southern Ocean and monsoons |
title_sort |
process-level improvements in cmip5 models and their impact on tropical variability, southern ocean and monsoons |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://elib.dlr.de/116614/ https://elib.dlr.de/116614/1/lauer-etal-esd-9-33-2018.pdf https://www.earth-syst-dynam.net/9/33/2018/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://elib.dlr.de/116614/1/lauer-etal-esd-9-33-2018.pdf Lauer, Axel und Jones, Colin und Eyring, Veronika und Evaldsson, Martin und Hagemann, Stefan und Mäkelä, Jarmo und Martin, Gill und Roehrig, Romain und Wang, Shiyu (2018) Process-level improvements in CMIP5 models and their impact on tropical variability, Southern Ocean and monsoons. Earth System Dynamics (9), Seiten 33-67. Copernicus Publications. doi:10.5194/esd-9-33-2018 <https://doi.org/10.5194/esd-9-33-2018>. ISSN 2190-4979. |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/esd-9-33-2018 |
container_title |
Earth System Dynamics |
container_volume |
9 |
container_issue |
1 |
container_start_page |
33 |
op_container_end_page |
67 |
_version_ |
1784256485335760896 |