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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todo:paper_08998418_v38_n_pe1288_Vera2023-10-03T15:44:31Z Activity of the Southern Annular Mode during 2015–2016 El Niño event and its impact on Southern Hemisphere climate anomalies Vera, C.S. Osman, M. ENSO PSA patterns SAM southeastern South America Nickel Circulation anomalies Climate predictability ENSO Precipitation anomalies PSA patterns Southeastern South America Surface air temperatures Western Antarctic Peninsula Climatology air-sea interaction Arctic Oscillation atmospheric circulation climate prediction climatology El Nino El Nino-Southern Oscillation Southern Hemisphere summer 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 JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08998418_v38_n_pe1288_Vera |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
ENSO PSA patterns SAM southeastern South America Nickel Circulation anomalies Climate predictability ENSO Precipitation anomalies PSA patterns Southeastern South America Surface air temperatures Western Antarctic Peninsula Climatology air-sea interaction Arctic Oscillation atmospheric circulation climate prediction climatology El Nino El Nino-Southern Oscillation Southern Hemisphere summer |
| spellingShingle |
ENSO PSA patterns SAM southeastern South America Nickel Circulation anomalies Climate predictability ENSO Precipitation anomalies PSA patterns Southeastern South America Surface air temperatures Western Antarctic Peninsula Climatology air-sea interaction Arctic Oscillation atmospheric circulation climate prediction climatology El Nino El Nino-Southern Oscillation Southern Hemisphere summer Vera, C.S. Osman, M. 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 ENSO Precipitation anomalies PSA patterns Southeastern South America Surface air temperatures Western Antarctic Peninsula Climatology air-sea interaction Arctic Oscillation atmospheric circulation climate prediction climatology 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 |
| format |
JOUR |
| author |
Vera, C.S. Osman, M. |
| author_facet |
Vera, C.S. Osman, M. |
| author_sort |
Vera, C.S. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_08998418_v38_n_pe1288_Vera |
| work_keys_str_mv |
AT veracs activityofthesouthernannularmodeduring20152016elninoeventanditsimpactonsouthernhemisphereclimateanomalies AT osmanm activityofthesouthernannularmodeduring20152016elninoeventanditsimpactonsouthernhemisphereclimateanomalies |
| _version_ |
1807317350777618432 |