دورية أكاديمية
Dominant contribution of atmospheric nonlinearities to ENSO asymmetry and extreme El Niño events
| العنوان: | Dominant contribution of atmospheric nonlinearities to ENSO asymmetry and extreme El Niño events |
|---|---|
| المؤلفون: | G. Srinivas, J. Vialard, F. Liu, A. Voldoire, T. Izumo, E. Guilyardi, M. Lengaigne |
| المصدر: | Scientific Reports, Vol 14, Iss 1, Pp 1-12 (2024) |
| بيانات النشر: | Nature Portfolio, 2024. |
| سنة النشر: | 2024 |
| المجموعة: | LCC:Medicine LCC:Science |
| مصطلحات موضوعية: | El Niño, La Niña, SST, Rainfall, Wind stress, Atmospheric nonlinearities, Medicine, Science |
| الوصف: | Abstract Extreme El Niño events have outsized impacts and strongly contribute to the El Niño Southern Oscillation (ENSO) warm/cold phase asymmetries. There is currently no consensus on the respective importance of oceanic and atmospheric nonlinearities for those asymmetries. Here, we use atmospheric and oceanic general circulation models that reproduce ENSO asymmetries well to quantify the atmospheric nonlinearities contribution. The linear and nonlinear components of the wind stress response to Sea Surface Temperature (SST) anomalies are isolated using ensemble atmospheric experiments, and used to force oceanic experiments. The wind stress-SST nonlinearity is dominated by the deep atmospheric convective response to SST. This wind-stress nonlinearity contributes to ~ 40% of the peak amplitude of extreme El Niño events and ~ 55% of the prolonged eastern Pacific warming they generate until the following summer. This large contribution arises because nonlinearities consistently drive equatorial westerly anomalies, while the larger linear component is made less efficient by easterly anomalies in the western Pacific during fall and winter. Overall, wind-stress nonlinearities fully account for the eastern Pacific positive ENSO skewness. Our findings underscore the pivotal role of atmospheric nonlinearities in shaping extreme El Niño events and, more generally, ENSO asymmetry. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2045-2322 |
| Relation: | https://doaj.org/toc/2045-2322 |
| DOI: | 10.1038/s41598-024-58803-3 |
| URL الوصول: | https://doaj.org/article/018eb4d8377b4f91adda7a163a77b0c8 |
| رقم الأكسشن: | edsdoj.018eb4d8377b4f91adda7a163a77b0c8 |
| قاعدة البيانات: | Directory of Open Access Journals |
Find this article in full text from Springer Verlag. 
Full Text Finder | تدمد: | 20452322 |
|---|---|
| DOI: | 10.1038/s41598-024-58803-3 |