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oai:docta.ucm.es:20.500.14352/44192023-08-25T23:11:50Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Ayargüena Porras, Blanca author Manzini, Elisa author Calvo Fernández, Natalia author Matei, Daniela 2023-06-16T14:15:52Z 2023-06-16T14:15:52Z 2021-07-11 0077-8923 10.1111/nyas.14663 https://hdl.handle.net/20.500.14352/4419 http://dx.doi.org/10.1111/nyas.14663 https://nyaspubs.onlinelibrary.wiley.com/ Major sudden stratospheric warmings (SSWs) are the most important phenomena of the wintertime boreal stratospheric variability.During SSWs, the polar temperature increases abruptly, and easterlies prevail in the stratosphere. Their effects extend farther from the polar stratosphere, affecting near-surface circulation. According to observations, SSWs are not equally distributed in time, with decades experiencing very few events, while others experiencing SSWs almost every winter. Some sources of this SSW multidecadal variability can be traced back to sea surface temperature changes.Here, we investigate the effects of Pacific decadal variability (PDV) and Atlanticmultidecadal variability (AMV) on SSWs. We use for the first time a large ensemble of historical experiments to examine the modulation of the frequency, tropospheric precursors, and impact of SSWs by the PDV and AMV.We find a strong impact of the PDV on the occurrence of SSWs, with a higher SSW frequency for the positive phase of the PDV. This PDV influence ismediated by constructive interference of PDV anomalies with tropospheric stationary waves. The main effect of AMV is, instead, a modulation of the tropospheric response to SSWs, a finding that can be useful for predicting the tropospheric fingerprint of SSWs. eng Atribución-NoComercial-SinDerivadas 3.0 España Interaction between decadal-to-multidecadal oceanic variability and sudden stratospheric warmings journal article URL https://docta.ucm.es/bitstreams/792a7ea2-8049-4892-812b-de78db3ba497/download File MD5 2428a79430a3742dfff82ae60c2ca4d6 6562464 application/pdf ayarzaguena02libre+CC.pdf