Twin tropical cyclones in the Indian Ocean: the role of equatorial waves

Sujata K. Mandke () and A. K. Sahai
Additional contact information
Sujata K. Mandke: Indian Institute of Tropical Meteorology
A. K. Sahai: Indian Institute of Tropical Meteorology

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2016, vol. 84, issue 3, No 35, 2224 pages

Abstract: Abstract This study explores the background atmospheric conditions that led to the development of recent two sets of twin tropical cyclones in the Indian Ocean. One set of twins formed in late December 2011 (“pair A”) and other in May 2013 (“pair B”). An extensive area of active convection prevailing over wide-equatorial region and low-level westerly wind over near-equatorial region is major precursors to the two cases of twins. Convection and accompanying westerlies slowly strengthen, and the two sets of twins tend to emerge within it. The atmospheric equatorial convectively coupled Kelvin wave (CCKW) and convectively coupled equatorial Rossby (CCER) wave played key role in the formation of the two twins’ events. Wave-enhanced equatorial convection and low-level westerly anomalies produced by the combination of CCKW and CCER wave are crucial for the development of “pair A” twins. CCKW prior to “pair B” twins produced convection and westerly anomalies over equatorial region. The equatorial westerlies are further modulated by CCER wave favoring twins of “pair B.” Moreover, convection reinforced by CCER wave in OLR aided occurrence of Northern Hemispheric cyclone of “pair A” and Southern Hemispheric cyclone of “pair B.” While the CCKW and CCER wave appear to be associated with the formation of the two twin cyclone cases, more thorough understanding of the mechanisms involved needs considerable attention in forthcoming research.

Keywords: Twin tropical cyclones; Indian Ocean; Kelvin wave; Equatorial Rossby wave (search for similar items in EconPapers)
Date: 2016
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://link.springer.com/10.1007/s11069-016-2546-z Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:spr:nathaz:v:84:y:2016:i:3:d:10.1007_s11069-016-2546-z

Ordering information: This journal article can be ordered from
http://www.springer.com/economics/journal/11069

DOI: 10.1007/s11069-016-2546-z

Access Statistics for this article

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards is currently edited by Thomas Glade, Tad S. Murty and Vladimír Schenk

More articles in Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards from Springer, International Society for the Prevention and Mitigation of Natural Hazards
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().