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

Liang, Ju and Catto, Jennifer L. and Hawcroft, Matthew and Hodges, Kevin I. and 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. ISSN 0894-8755

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: This article is licensed under a Creative Commons Attribution 4.0 license (http://creativecommons.org/ licenses/by/4.0/).
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Applied Climate Sciences (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Applied Climate Sciences (1 Aug 2018 -)
Date Deposited: 26 May 2021 00:27
Last Modified: 12 Oct 2021 05:32
Uncontrolled Keywords: maritime continent; precipitation; convective storms; climate models; tropical variability
Fields of Research (2008): 04 Earth Sciences > 0401 Atmospheric Sciences > 040107 Meteorology
04 Earth Sciences > 0401 Atmospheric Sciences > 040102 Atmospheric Dynamics
Fields of Research (2020): 37 EARTH SCIENCES > 3701 Atmospheric sciences > 370108 Meteorology
37 EARTH SCIENCES > 3701 Atmospheric sciences > 370105 Atmospheric dynamics
Identification Number or DOI: https://doi.org/10.1175/JCLI-D-20-0604.1
URI: http://eprints.usq.edu.au/id/eprint/42027

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