Park, Jae-Heung Koo, Ja-Ho Kug, Jong-Seong Lee, Su-Jung Sung, Mi-Kyung Kim, Joowan Chang, Eun-Chul Yang, Young-Min Park, Sang Seo Kwak, Kyung-Hwan Oh, Ji-Hoon Kang, Hyung-Jeon An, Soon-Il 2025-11-21T02:48:39Z 2025-11-21T02:48:39Z 2025-11-11 2025-10 2397-3722 https://pubs.kist.re.kr/handle/201004/153609 Variability in Arctic stratospheric ozone (ASO) has significant implications for surface climate. Using observational reanalysis datasets and Ozone Monitoring Instrument data, we found that the springtime ASO variations since the 2000s can serve as a precursor to El Ni & ntilde;o-Southern Oscillation in the subsequent winter. Springtime ASO variability has become pronounced, particularly over Eurasia, due to the asymmetric structure of the Arctic stratospheric polar vortex. With the return of solar radiation to the Arctic in spring, elevated ASO increases solar absorption over Eurasia, contributing to localized stratospheric heating. This heating induces an upper-tropospheric cyclonic circulation over Siberia, facilitating wave energy propagation toward the tropical Pacific. Consequently, upper-level easterly and low-level westerly wind anomalies emerge over the equatorial Pacific, favoring El Ni & ntilde;o development (cf. La Ni & ntilde;a for decreased ASO). These results highlight the importance of chemical-radiative-dynamical processes in the Arctic stratosphere for understanding tropospheric climate variability. English Nature Publishing Group Arctic stratospheric ozone as a precursor of ENSO events since 2000s Article 10.1038/s41612-025-01220-8 1 npj Climate and Atmospheric Science, v.8, no.1 npj Climate and Atmospheric Science 8 1 Y scie scopus 001587929100002 2-s2.0-105018184854 Meteorology & Atmospheric Sciences Meteorology & Atmospheric Sciences Article BREWER-DOBSON CIRCULATION QUASI-BIENNIAL OSCILLATION POLAR VORTEX SEA-ICE DEPLETION CLIMATE WINTER TRENDS SHIFT PRECIPITATION