[{"scopus_import":"1","OA_type":"hybrid","language":[{"iso":"eng"}],"article_number":"e70131","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_processing_charge":"Yes (via OA deal)","abstract":[{"text":"This study investigates the mechanisms driving clustered convection and the breakdown of the Intertropical Convergence Zone (ITCZ) over the Western Pacific Warm Pool using high‐resolution cloud‐resolving simulations and machine‐learning sensitivity experiments. Results show that ITCZ breakdown episodes, marked by spatially homogeneous convection and weakened meridional moisture gradients, are triggered primarily by anomalous moisture advection linked to the equatorial Rossby‐wave activity. While large‐scale moisture advection regulates the background convective state strongly, it is the surface and low‐level meridional winds that dominate transitions between clustered and random convection. Simulations demonstrate that moisture alone can sustain convective clustering, but breakdown episodes are more persistent and widespread when coupled with southerly meridional advection. These findings confirm that wave‐driven advection acts as a regulatory mechanism, periodically disrupting convective clustering and reshaping the meridional moisture gradient. This modulation of organization by wave‐induced breakdown events is critical for understanding tropical convection variability and its implications for the climate system.","lang":"eng"}],"doi":"10.1002/qj.70131","project":[{"call_identifier":"H2020","_id":"fc2ed2f7-9c52-11eb-aca3-c01059dda49c","name":"IST-BRIDGE: International postdoctoral program","grant_number":"101034413"},{"_id":"629205d8-2b32-11ec-9570-e1356ff73576","call_identifier":"H2020","name":"Organization of CLoUdS, and implications of Tropical  cyclones and for the Energetics of the tropics, in current and waRming climate","grant_number":"805041"}],"acknowledgement":"This article is based on chapter 5 of the PhD thesis of A. Casallas. The authors thank Graziano Giuliani for discussions on the boundary-condition experiments. A. Casallas was supported by a PhD fellowship awarded by the Abdus Salam International Centre for Theoretical Physics. A. Casallas also acknowledges support by the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No 101034413. C. Muller acknowledges funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (Project CLUSTER, Grant Agreement No. 805041). The authors gratefully acknowledge Daniel Hernández-Deckers, Lokahith Agasthya, Chris Holloway, and Paolina Cerlini for their valuable feedback and insightful discussions. They are especially thankful to Bety Pechacova for suggesting the use of SHAP to complement their analysis. They also thank the two anonymous reviewers for their constructive comments, which improved the quality and clarity of the article significantly. Open Access funding provided by Institute of Science and Technology Austria/KEMÖ.","ec_funded":1,"tmp":{"name":"Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)","legal_code_url":"https://creativecommons.org/licenses/by-nc/4.0/legalcode","image":"/images/cc_by_nc.png","short":"CC BY-NC (4.0)"},"publisher":"Wiley","publication":"Quarterly Journal of the Royal Meteorological Society","type":"journal_article","day":"12","date_updated":"2026-02-16T10:19:52Z","date_created":"2026-02-12T10:13:02Z","status":"public","article_type":"original","corr_author":"1","year":"2026","oa_version":"Published Version","license":"https://creativecommons.org/licenses/by-nc/4.0/","publication_status":"epub_ahead","OA_place":"publisher","date_published":"2026-02-12T00:00:00Z","month":"02","citation":{"ama":"Casallas Garcia A, Mark Tompkins A, Muller CJ. Moisture and wind effects of Rossby waves on Western Pacific Intertropical Convergence Zone breakdown events. <i>Quarterly Journal of the Royal Meteorological Society</i>. 2026. doi:<a href=\"https://doi.org/10.1002/qj.70131\">10.1002/qj.70131</a>","mla":"Casallas Garcia, Alejandro, et al. “Moisture and Wind Effects of Rossby Waves on Western Pacific Intertropical Convergence Zone Breakdown Events.” <i>Quarterly Journal of the Royal Meteorological Society</i>, e70131, Wiley, 2026, doi:<a href=\"https://doi.org/10.1002/qj.70131\">10.1002/qj.70131</a>.","apa":"Casallas Garcia, A., Mark Tompkins, A., &#38; Muller, C. J. (2026). Moisture and wind effects of Rossby waves on Western Pacific Intertropical Convergence Zone breakdown events. <i>Quarterly Journal of the Royal Meteorological Society</i>. Wiley. <a href=\"https://doi.org/10.1002/qj.70131\">https://doi.org/10.1002/qj.70131</a>","ieee":"A. Casallas Garcia, A. Mark Tompkins, and C. J. Muller, “Moisture and wind effects of Rossby waves on Western Pacific Intertropical Convergence Zone breakdown events,” <i>Quarterly Journal of the Royal Meteorological Society</i>. Wiley, 2026.","ista":"Casallas Garcia A, Mark Tompkins A, Muller CJ. 2026. Moisture and wind effects of Rossby waves on Western Pacific Intertropical Convergence Zone breakdown events. Quarterly Journal of the Royal Meteorological Society., e70131.","short":"A. Casallas Garcia, A. Mark Tompkins, C.J. Muller, Quarterly Journal of the Royal Meteorological Society (2026).","chicago":"Casallas Garcia, Alejandro, Adrian Mark Tompkins, and Caroline J Muller. “Moisture and Wind Effects of Rossby Waves on Western Pacific Intertropical Convergence Zone Breakdown Events.” <i>Quarterly Journal of the Royal Meteorological Society</i>. Wiley, 2026. <a href=\"https://doi.org/10.1002/qj.70131\">https://doi.org/10.1002/qj.70131</a>."},"author":[{"id":"92081129-2d75-11ef-a48d-b04dd7a2385a","orcid":"0000-0002-1988-5035","last_name":"Casallas Garcia","first_name":"Alejandro","full_name":"Casallas Garcia, Alejandro"},{"full_name":"Mark Tompkins, Adrian","last_name":"Mark Tompkins","first_name":"Adrian"},{"id":"f978ccb0-3f7f-11eb-b193-b0e2bd13182b","orcid":"0000-0001-5836-5350","full_name":"Muller, Caroline J","last_name":"Muller","first_name":"Caroline J"}],"department":[{"_id":"CaMu"}],"main_file_link":[{"open_access":"1","url":"https://doi.org/10.1002/qj.70131"}],"has_accepted_license":"1","ddc":["550"],"oa":1,"publication_identifier":{"issn":["0035-9009"],"eissn":["1477-870X"]},"title":"Moisture and wind effects of Rossby waves on Western Pacific Intertropical Convergence Zone breakdown events","_id":"21217","quality_controlled":"1"}]