Climatology of Borneo vortices in the HadGEM3-GC3.1 General Circulation Model

Article


Liang, Ju, Catto, Jennifer L., Hawcroft, Matthew, Hodges, Kevin I., Tan, Mou Leong and Haywood, James M.. 2021. "Climatology of Borneo vortices in the HadGEM3-GC3.1 General Circulation Model." Journal of Climate. 34 (9), pp. 3401-3419. https://doi.org/10.1175/JCLI-D-20-0604.1
Article Title

Climatology of Borneo vortices in the HadGEM3-GC3.1 General Circulation Model

ERA Journal ID1978
Article CategoryArticle
AuthorsLiang, Ju (Author), Catto, Jennifer L. (Author), Hawcroft, Matthew (Author), Hodges, Kevin I. (Author), Tan, Mou Leong (Author) and Haywood, James M. (Author)
Journal TitleJournal of Climate
Journal Citation34 (9), pp. 3401-3419
Number of Pages19
Year2021
PublisherAmerican Meteorological Society
Place of PublicationUnited States
ISSN0894-8755
1520-0442
Digital Object Identifier (DOI)https://doi.org/10.1175/JCLI-D-20-0604.1
Web Address (URL)https://journals.ametsoc.org/view/journals/clim/34/9/JCLI-D-20-0604.1.xml
Abstract

Borneo vortices (BVs) are intense precipitating winter storms that develop over the equatorial South China Sea and strongly affect the weather and climate over the western Maritime Continent because of their association with deep convection and heavy rainfall. In this study, the ability of the Hadley Centre Global Environment Model 3–Global Coupled, version 3.1 (HadGEM3-GC3.1), global climate model to simulate the climatology of BVs at different horizontal resolutions is examined using an objective feature-tracking algorithm. The HadGEM3-GC3.1 at the N512 (25 km) horizontal resolution simulates BVs with well-represented characteristics, including their frequency, spatial distribution, and lower-tropospheric structures when compared with BVs identified in a climate reanalysis, whereas the BVs in the N96 (~135 km) and N216 (~65 km) simulations are much weaker and less frequent. Also, the N512 simulation better captures the contribution of BVs to the winter precipitation in Borneo and the Malay Peninsula when compared with precipitation from a reanalysis data and from observations, whereas the N96 and N216 simulations underestimate this contribution because of the overly weak low-level convergence of the simulated BVs. The N512 simulation also exhibits an improved ability to reproduce the modulation of BV activity by the occurrence of northeasterly cold surges and active phases of the Madden–Julian oscillation in the region, including increased BV track densities, intensities, and lifetimes. A sufficiently high model resolution is thus found to be important to realistically simulate the present-climate precipitation extremes associated with BVs and to study their possible changes in a warmer climate.

Keywordsmaritime continent; precipitation; convective storms; climate models; tropical variability
ANZSRC Field of Research 2020370108. Meteorology
370105. Atmospheric dynamics
Byline AffiliationsUniversity of Exeter, United Kingdom
Centre for Applied Climate Sciences
University of Reading, United Kingdom
University of Science, Malaysia
Institution of OriginUniversity of Southern Queensland
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