2026-06-29T08:13:45Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/976882025-03-18T15:51:53Zcom_20.500.14352_14col_20.500.14352_15

Abrupt and persistent atmospheric circulation changes in the North Atlantic under La Niña conditions García-Burgos, Marina Gómara Cardalliaguet, Íñigo Rodríguez De Fonseca, María Belén González Alemán, Juan Jesús Zurita Gotor, Pablo Ayarzagüena Porras, Blanca 550.3 Geofísica 25 Ciencias de la Tierra y del Espacio Several recent studies have linked the exceptional North Atlantic and Eurasian atmospheric evolution during late February and March 2018 to the Sudden Stratospheric Warming (SSW) that took place a few weeks earlier. February 2018 was characterized by an abrupt transition from the positive to the negative phase of the North Atlantic Oscillation (NAO) and a subsequent persistence of the negative NAO for several weeks. This paper investigates the contribution of atmospheric and oceanic phenomena to both the 2018 event and a set of 19 identified analogues (including the former) for the period 1959-2022. Evidence is given that La Nin similar to a conditions in the tropical Pacific and upstream North Atlantic cyclones play an important role as a trigger for these events. Ensuing two-way tropospheric-strato-spheric coupling and eddy feedbacks provide extended-range persistence for negative NAO conditions. These results may help improve the prediction of such exceptional events. Unión Europea Horizonte 2020 Universidad Complutense de Madrid Ministerio de Ciencia e Innovación (España) JeDiS Instituto de Salud Carlos III Depto. de Física de la Tierra y Astrofísica Fac. de Ciencias Físicas TRUE pub 2024-02-01T12:46:09Z 2024-02-01T12:46:09Z 2023-09-03 journal article VoR https://hdl.handle.net/20.500.14352/97688 XXXX-XXXX 10.1016/j.wace.2023.100609 2212-0947 eng info:eu-repo/grantAgreement/EC/H2020/817578/EU info:eu-repo/grantAgreement/FEI-EU-19-09 info:eu-repo/grantAgreement/CGL2017-86415-R info:eu-repo/grantAgreement/RTI2018-096402-B-I00 info:eu-repo/grantAgreement/PRE2019-090618 García-Burgos, Marina, et al. «Abrupt and Persistent Atmospheric Circulation Changes in the North Atlantic under La Niña Conditions». Weather and Climate Extremes, vol. 42, diciembre de 2023, p. 100609. DOI.org (Crossref), https://doi.org/10.1016/j.wace.2023.100609. Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ open access application/pdf Elsevier