Activity of the Southern Annular Mode during 2015–2016 El Niño event and its impact on Southern Hemisphere climate anomalies
Previous studies documented that El Niño (EN) events are in general associated with negative phases of the Southern Annular Mode (SAM). EN 2015–2016 (EN15–16) was one of the three strongest events ever recorded. However, it was associated with a SAM positive phase of extreme intensity. Furthermore,...
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ftunibueairesbd:paper:paper_08998418_v38_n_pe1288_Vera 2023-05-15T13:51:25+02:00 Activity of the Southern Annular Mode during 2015–2016 El Niño event and its impact on Southern Hemisphere climate anomalies 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v38_n_pe1288_Vera https://hdl.handle.net/20.500.12110/paper_08998418_v38_n_pe1288_Vera unknown https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v38_n_pe1288_Vera http://hdl.handle.net/20.500.12110/paper_08998418_v38_n_pe1288_Vera ENSO PSA patterns SAM southeastern South America Nickel Circulation anomalies Climate predictability Precipitation anomalies Surface air temperatures Western Antarctic Peninsula Climatology air-sea interaction Arctic Oscillation atmospheric circulation climate prediction El Nino El Nino-Southern Oscillation Southern Hemisphere summer 2018 ftunibueairesbd https://doi.org/20.500.12110/paper_08998418_v38_n_pe1288_Vera 2023-02-16T02:16:17Z Previous studies documented that El Niño (EN) events are in general associated with negative phases of the Southern Annular Mode (SAM). EN 2015–2016 (EN15–16) was one of the three strongest events ever recorded. However, it was associated with a SAM positive phase of extreme intensity. Furthermore, while the negative linear relationship between ENSO and SAM during the most recent period (1986–2014) was significant and associated with a narrow uncertainty band, the combined condition of both climate patterns in the EN15–16 event was an outlier. The EN15–16 influence on the austral summer circulation anomalies at the extratropical and polar regions of the Southern Hemisphere was considerably altered by the strong SAM positive phase, which was evident not only at the troposphere but also at the stratosphere. Such circulation changes resulted in unusual regional impacts, such as negative anomalies of surface air temperature in western Antarctic Peninsula and negative precipitation anomalies in southeastern South America, ever recorded for previous strong EN events. Further research is needed to better understand the mechanisms explaining the SAM behaviour during 2015–2016 and its implication for climate predictability on seasonal timescales. © 2018 Royal Meteorological Society Other/Unknown Material Antarc* Antarctic Antarctic Peninsula Arctic Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) Antarctic Antarctic Peninsula Arctic Austral |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
ENSO PSA patterns SAM southeastern South America Nickel Circulation anomalies Climate predictability Precipitation anomalies Surface air temperatures Western Antarctic Peninsula Climatology air-sea interaction Arctic Oscillation atmospheric circulation climate prediction El Nino El Nino-Southern Oscillation Southern Hemisphere summer |
spellingShingle |
ENSO PSA patterns SAM southeastern South America Nickel Circulation anomalies Climate predictability Precipitation anomalies Surface air temperatures Western Antarctic Peninsula Climatology air-sea interaction Arctic Oscillation atmospheric circulation climate prediction El Nino El Nino-Southern Oscillation Southern Hemisphere summer Activity of the Southern Annular Mode during 2015–2016 El Niño event and its impact on Southern Hemisphere climate anomalies |
topic_facet |
ENSO PSA patterns SAM southeastern South America Nickel Circulation anomalies Climate predictability Precipitation anomalies Surface air temperatures Western Antarctic Peninsula Climatology air-sea interaction Arctic Oscillation atmospheric circulation climate prediction El Nino El Nino-Southern Oscillation Southern Hemisphere summer |
description |
Previous studies documented that El Niño (EN) events are in general associated with negative phases of the Southern Annular Mode (SAM). EN 2015–2016 (EN15–16) was one of the three strongest events ever recorded. However, it was associated with a SAM positive phase of extreme intensity. Furthermore, while the negative linear relationship between ENSO and SAM during the most recent period (1986–2014) was significant and associated with a narrow uncertainty band, the combined condition of both climate patterns in the EN15–16 event was an outlier. The EN15–16 influence on the austral summer circulation anomalies at the extratropical and polar regions of the Southern Hemisphere was considerably altered by the strong SAM positive phase, which was evident not only at the troposphere but also at the stratosphere. Such circulation changes resulted in unusual regional impacts, such as negative anomalies of surface air temperature in western Antarctic Peninsula and negative precipitation anomalies in southeastern South America, ever recorded for previous strong EN events. Further research is needed to better understand the mechanisms explaining the SAM behaviour during 2015–2016 and its implication for climate predictability on seasonal timescales. © 2018 Royal Meteorological Society |
title |
Activity of the Southern Annular Mode during 2015–2016 El Niño event and its impact on Southern Hemisphere climate anomalies |
title_short |
Activity of the Southern Annular Mode during 2015–2016 El Niño event and its impact on Southern Hemisphere climate anomalies |
title_full |
Activity of the Southern Annular Mode during 2015–2016 El Niño event and its impact on Southern Hemisphere climate anomalies |
title_fullStr |
Activity of the Southern Annular Mode during 2015–2016 El Niño event and its impact on Southern Hemisphere climate anomalies |
title_full_unstemmed |
Activity of the Southern Annular Mode during 2015–2016 El Niño event and its impact on Southern Hemisphere climate anomalies |
title_sort |
activity of the southern annular mode during 2015–2016 el niño event and its impact on southern hemisphere climate anomalies |
publishDate |
2018 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v38_n_pe1288_Vera https://hdl.handle.net/20.500.12110/paper_08998418_v38_n_pe1288_Vera |
geographic |
Antarctic Antarctic Peninsula Arctic Austral |
geographic_facet |
Antarctic Antarctic Peninsula Arctic Austral |
genre |
Antarc* Antarctic Antarctic Peninsula Arctic |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Arctic |
op_relation |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v38_n_pe1288_Vera http://hdl.handle.net/20.500.12110/paper_08998418_v38_n_pe1288_Vera |
op_doi |
https://doi.org/20.500.12110/paper_08998418_v38_n_pe1288_Vera |
_version_ |
1766255272859271168 |