{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,14]],"date-time":"2026-02-14T02:24:35Z","timestamp":1771035875510,"version":"3.50.1"},"reference-count":48,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2024,12,19]],"date-time":"2024-12-19T00:00:00Z","timestamp":1734566400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["42105056"],"award-info":[{"award-number":["42105056"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The minor sudden stratospheric warming (SSW) event and the relevant planetary waves are investigated by analyzing ERA5 reanalysis data from July to December 2019. Frequency-wavenumber spectral analysis shows that the quasi-10-day and quasi-16-day waves dominate the stratosphere over the Southern Hemispheric polar region with the eastward-propagating wavenumber 1 during the SSW event. The corresponding amplitudes and phases of each wave mode have been fitted using the two-dimensional harmonic fitting method. The result suggests that quasi-16-day and quasi-10-day waves prior to the SSW event had an important effect on the occurrence of the SSW event. Furthermore, the Eliassen\u2013Palm flux diagnosis shows that the quasi-16-day wave and quasi-10-day wave had poleward and equatorward-propagating components. The poleward-propagating component may have come from the tropical tropospheric convective activity. The equatorward component may have been excited by the atmospheric barotropic\/baroclinic instability.<\/jats:p>","DOI":"10.3390\/rs16244739","type":"journal-article","created":{"date-parts":[[2024,12,19]],"date-time":"2024-12-19T06:50:44Z","timestamp":1734591044000},"page":"4739","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Planetary Wave Activity During 2019 Sudden Stratospheric Warming Event Revealed by ERA5 Reanalysis Data"],"prefix":"10.3390","volume":"16","author":[{"given":"Yushun","family":"Yang","sequence":"first","affiliation":[{"name":"College of Science, China Agricultural University, Beijing 100083, China"}]},{"given":"Haiyan","family":"Li","sequence":"additional","affiliation":[{"name":"College of Science, China Agricultural University, Beijing 100083, China"}]}],"member":"1968","published-online":{"date-parts":[[2024,12,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2926","DOI":"10.1002\/2014JA020355","article-title":"On the latitudinal distribution of mesospheric temperatures during sudden stratospheric warming events","volume":"120","author":"Singh","year":"2015","journal-title":"J. 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