On the Presence of Tropical Vortices over the Southeast Asian Sea–Maritime Continent Region

Nguyen Dang-Quang School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand, and National Centre for Hydrometeorological Forecastings of Vietnam, Hanoi, Vietnam

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James Renwick School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand

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James McGregor School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand

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Abstract

Reanalysis and observation data from 1979 to 2010 are used to study the climatological behavior of regional vortices over the Southeast Asian sea–Maritime Continent region (SEAMC). After eliminating tropical cyclones from the International Best Tracks Archive for Climate Stewardship (IBTrACS), significant numbers of vortices remained over the region. The results also show that the vortices, rather than being relatively stationary near the Borneo coast in the winter, were consistently present over the SEAMC throughout the year, migrating from the area of the coast of Vietnam, the Philippines, and the Southeast Asian sea in summer to the island of Borneo region in winter. These vortices can produce significant amounts of rainfall in Vietnam, especially in central coastal regions during the postsummer monsoon (autumn) period.

Denotes Open Access content.

Corresponding author address: Nguyen Dang-Quang, SGEES, Victoria University of Wellington, New Zealand, Room 142, Cotton Building, Kelburn Campus–Gate 7, Kelburn Parade, Wellington 6012, New Zealand. E-mail: quang.nguyen@vuw.ac.nz

Abstract

Reanalysis and observation data from 1979 to 2010 are used to study the climatological behavior of regional vortices over the Southeast Asian sea–Maritime Continent region (SEAMC). After eliminating tropical cyclones from the International Best Tracks Archive for Climate Stewardship (IBTrACS), significant numbers of vortices remained over the region. The results also show that the vortices, rather than being relatively stationary near the Borneo coast in the winter, were consistently present over the SEAMC throughout the year, migrating from the area of the coast of Vietnam, the Philippines, and the Southeast Asian sea in summer to the island of Borneo region in winter. These vortices can produce significant amounts of rainfall in Vietnam, especially in central coastal regions during the postsummer monsoon (autumn) period.

Denotes Open Access content.

Corresponding author address: Nguyen Dang-Quang, SGEES, Victoria University of Wellington, New Zealand, Room 142, Cotton Building, Kelburn Campus–Gate 7, Kelburn Parade, Wellington 6012, New Zealand. E-mail: quang.nguyen@vuw.ac.nz
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