{"title":"Influence of Indian Ocean Tropical Cyclones on the Development of the Madden-Julian Oscillation in December 2011","authors":"Suyang Pei, Toshiaki Shinoda","doi":"10.1029/2024GL111502","DOIUrl":null,"url":null,"abstract":"<p>Previous studies demonstrate that the Madden-Julian Oscillation (MJO) modulates tropical cyclone (TC) activity over various locations worldwide. Since TCs are associated with anomalous large-scale circulations, they can influence the development of the MJO. However, the impact of TC on the MJO has not been thoroughly examined. This study investigates the influence of TC-associated processes on the MJO development based on the analysis of a case observed during the Dynamics of the Madden-Julian Oscillation field campaign. During the suppressed phase before the December 2011 MJO initiation, two TCs were active in the southern Tropical Indian Ocean (TIO). A dry air band within 10°S-Eq is sustained by TC-induced horizontal advection and descent, inhibiting large-scale convection in the southern equatorial IO. Consequently, convection is triggered and develops only in the northern TIO around Eq-10°N. The MJO initiates as convection develops south of the equator after the TCs dissipate.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 2","pages":""},"PeriodicalIF":4.6000,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024GL111502","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geophysical Research Letters","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2024GL111502","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Previous studies demonstrate that the Madden-Julian Oscillation (MJO) modulates tropical cyclone (TC) activity over various locations worldwide. Since TCs are associated with anomalous large-scale circulations, they can influence the development of the MJO. However, the impact of TC on the MJO has not been thoroughly examined. This study investigates the influence of TC-associated processes on the MJO development based on the analysis of a case observed during the Dynamics of the Madden-Julian Oscillation field campaign. During the suppressed phase before the December 2011 MJO initiation, two TCs were active in the southern Tropical Indian Ocean (TIO). A dry air band within 10°S-Eq is sustained by TC-induced horizontal advection and descent, inhibiting large-scale convection in the southern equatorial IO. Consequently, convection is triggered and develops only in the northern TIO around Eq-10°N. The MJO initiates as convection develops south of the equator after the TCs dissipate.
期刊介绍：
Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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