RT Journal Article
T1 Stratospheric role in interdecadal changes of El Niño impacts over Europe.
A1 Ayarzagüena, Blanca
A1 López Parages, Jorge
A1 Iza, Madalen
A1 Calvo, Natalia
A1 Rodríguez de Fonseca, Belén
K1 El Niño (Corriente marina)
K1 Precipitaciones atmosféricas - Europa
K1 Estratosfera
AB The European precipitation response to El Niño (EN) has been found to present interdecadal changes, with alternated periodsof important or negligible EN impact in late winter. These periods are associated with opposite phases of multi-decadal seasurface temperature (SST) variability, which modifies the tropospheric background and EN teleconnections. In addition,other studies have shown how SST anomalies in the equatorial Pacific, and in particular, the location of the largest anomalousSST, modulate the stratospheric response to EN. Nevertheless, the role of the stratosphere on the stationarity of EN responsehas not been investigated in detail so far. Using reanalysis data, we present a comprehensive study of EN teleconnections toEurope including the role of the ocean background and the stratosphere in the stationarity of the signal. The results revealmultidecadal variability in the location of EN-related SST anomalies that determines different teleconnections. In periodswith relevant precipitation signal over Europe, the EN SST pattern resembles Eastern Pacific EN and the stratosphericpathway plays a key role in transmitting the signal to Europe in February, together with two tropospheric wavetrains thattransmit the signal in February and April. Conversely, the stratospheric pathway is not detected in periods with a weak ENimpact on European precipitation, corresponding to EN-related SST anomalies primarily located over the central Pacific.SST mean state and its associated atmospheric background control the location of EN-related SST anomalies in differentperiods and modulate the establishment of the aforementioned stratospheric pathway of EN teleconnection to Europe too.
PB Springer
YR 2018
FD 2018-04-02
LK https://hdl.handle.net/10630/33463
UL https://hdl.handle.net/10630/33463
LA eng
NO Ayarzagüena, B., López-Parages, J., Iza, M. et al. Stratospheric role in interdecadal changes of El Niño impacts over Europe. Clim Dyn 52, 1173–1186 (2019). https://doi.org/10.1007/s00382-018-4186-3
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026