Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/100027
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dc.contributor.authorKoseki, Shunyaen
dc.contributor.authorKoh, Tieh Yongen
dc.contributor.authorTeo, Chee Kiaten
dc.date.accessioned2014-06-11T04:28:00Zen
dc.date.accessioned2019-12-06T20:15:21Z-
dc.date.available2014-06-11T04:28:00Zen
dc.date.available2019-12-06T20:15:21Z-
dc.date.copyright2014en
dc.date.issued2014en
dc.identifier.citationKoseki, S., Koh, T. Y., & Teo, C. K. (2014). Borneo vortex and mesoscale convective rainfall. Atmospheric Chemistry and Physics, 14(9), 4539-4562.en
dc.identifier.issn1680-7324en
dc.identifier.urihttps://hdl.handle.net/10356/100027-
dc.description.abstractWe have investigated how the Borneo vortex develops over the equatorial South China Sea under cold surge conditions in December during the Asian winter monsoon. Composite analysis using reanalysis and satellite data sets has revealed that absolute vorticity and water vapour are transported by strong cold surges from upstream of the South China Sea to around the Equator. Rainfall is correspondingly enhanced over the equatorial South China Sea. A semi-idealized experiment reproduced the Borneo vortex over the equatorial South China Sea during a "perpetual" cold surge. The Borneo vortex is manifested as a meso-α cyclone with a comma-shaped rainband in the northeast sector of the cyclone. Vorticity budget analysis showed that the growth/maintenance of the meso-α cyclone was achieved mainly by the vortex stretching. This vortex stretching is due to the upward motion forced by the latent heat release around the cyclone centre. The comma-shaped rainband consists of clusters of meso-β-scale rainfall cells. The intense rainfall in the comma head (comma tail) is generated by the confluence of the warmer and wetter cyclonic easterly flow (cyclonic southeasterly flow) and the cooler and drier northeasterly surge in the northwestern (northeastern) sector of the cyclone. Intense upward motion and heavy rainfall resulted due to the low-level convergence and the favourable thermodynamic profile at the confluence zone. In particular, the convergence in the northwestern sector is responsible for maintenance of the meso-α cyclone system. At both meso-α and meso-β scales, the convergence is ultimately caused by the deviatoric strain in the confluence wind pattern but is significantly self-enhanced by the nonlinear dynamics.en
dc.language.isoenen
dc.relation.ispartofseriesAtmospheric chemistry and physicsen
dc.rights© Author(s) 2014. This work is distributed under the Creative Commons Attribution 3.0 License.en
dc.subjectDRNTU::Science::Physics::Meteorology and climatologyen
dc.titleBorneo vortex and mesoscale convective rainfallen
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen
dc.contributor.researchEarth Observatory of Singaporeen
dc.contributor.researchTemasek Laboratoriesen
dc.identifier.doi10.5194/acp-14-4539-2014en
dc.description.versionPublished versionen
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item.grantfulltextopen-
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