Monsoonal precipitation over Peninsular Malaysia in the CMIP6 HighResMIP experiments: the role of model resolution

Article


Liang, Ju, Tan, Mou Leong, Hawcroft, Matthew, Catto, Jennifer L., Hodges, Kevin I. and Haywood, James M.. 2022. "Monsoonal precipitation over Peninsular Malaysia in the CMIP6 HighResMIP experiments: the role of model resolution." Climate Dynamics. 58 (9-10), pp. 2783-2805. https://doi.org/10.1007/s00382-021-06033-y
Article Title

Monsoonal precipitation over Peninsular Malaysia in the CMIP6 HighResMIP experiments: the role of model resolution

ERA Journal ID1962
Article CategoryArticle
AuthorsLiang, Ju, Tan, Mou Leong, Hawcroft, Matthew, Catto, Jennifer L., Hodges, Kevin I. and Haywood, James M.
Journal TitleClimate Dynamics
Journal Citation58 (9-10), pp. 2783-2805
Number of Pages23
Year2022
PublisherSpringer
Place of PublicationGermany
ISSN0930-7575
1432-0894
Digital Object Identifier (DOI)https://doi.org/10.1007/s00382-021-06033-y
Web Address (URL)https://link.springer.com/article/10.1007/s00382-021-06033-y
Abstract

This study investigates the ability of 20 model simulations which contributed to the CMIP6 HighResMIP to simulate precipitation in different monsoon seasons and extreme precipitation events over Peninsular Malaysia. The model experiments utilize common forcing but are run with different horizontal and vertical resolutions. The impact of resolution on the models’ abilities to simulate precipitation and associated environmental fields is assessed by comparing multi-model ensembles at different resolutions with three observed precipitation datasets and four climate reanalyses. Model simulations with relatively high horizontal and vertical resolution exhibit better performance in simulating the annual cycle of precipitation and extreme precipitation over Peninsular Malaysia and the coastal regions. Improvements associated with the increase in horizontal and vertical resolutions are also found in the statistical relationship between precipitation and monsoon intensity in different seasons. However, the increase in vertical resolution can lead to a reduction of annual mean precipitation compared to that from the models with low vertical resolutions, associated with an overestimation of moisture divergence and underestimation of lower-tropospheric vertical ascent in the different monsoon seasons. This limits any improvement in the simulation of precipitation in the high vertical resolution experiments, particularly for the Southwest monsoon season.

KeywordsModel resolution; CMIP6 HighResMIP; Precipitation ; Peninsular Malaysia
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Byline AffiliationsUniversity of Exeter, United Kingdom
University of Science, Malaysia
University of Southern Queensland
University of Reading, United Kingdom
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