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.
![]() |
PDF
17MB |
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: |
| ||||||||||||||||||||||||||||||||||||||||
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 - Earth Observation | ||||||||||||||||||||||||||||||||||||||||
DLR - Research theme (Project): | R - Atmospheric and climate research | ||||||||||||||||||||||||||||||||||||||||
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: | 02 Nov 2023 12:05 |
Repository Staff Only: item control page