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Atlantic Multidecadal Variability modulates the climate impacts of El Niño–Southern Oscillation in Australia

التفاصيل البيبلوغرافية
العنوان: Atlantic Multidecadal Variability modulates the climate impacts of El Niño–Southern Oscillation in Australia
المؤلفون: Paloma Trascasa-Castro, Amanda C Maycock, Yohan Ruprich-Robert, Marco Turco, Paul W Staten
المصدر: Environmental Research Letters, Vol 18, Iss 8, p 084029 (2023)
بيانات النشر: IOP Publishing, 2023.
سنة النشر: 2023
المجموعة: LCC:Environmental technology. Sanitary engineering
LCC:Environmental sciences
LCC:Science
LCC:Physics
مصطلحات موضوعية: Atlantic Multidecadal Variability, ENSO, teleconnections, climate impacts, Australia, Environmental technology. Sanitary engineering, TD1-1066, Environmental sciences, GE1-350, Science, Physics, QC1-999
الوصف: Atlantic Multidecadal Variability (AMV) modulates El Niño–Southern Oscillation (ENSO) dynamics. Here, we explore the effect of warm (AMV+) and cold (AMV−) AMV conditions on the austral summer teleconnection of ENSO to Australia using idealized simulations performed with the NCAR-CESM1 model. AMV+ strengthens the mean and extreme precipitation and temperature responses to El Niño in south-western Australia and weakens the mean precipitation and temperature impacts in north-eastern Australia. The modulation of La Niña impacts by AMV is asymmetric to El Niño, with a weakening of the mean and extreme precipitation and temperature responses in eastern Australia. Decomposing the total difference in ENSO response between AMV phases, we find that the signals are mainly explained by the direct AMV modulation of ENSO and its teleconnections rather than by changes in background climate induced by AMV. The exception is ENSO-driven fire impacts, where there is a significant increase in burned area in south-eastern Australia only when El Niño and AMV+ co-occur. However, modulation of ENSO between AMV+ and AMV− does offset ∼37% of the decrease in burned area extent during La Niña summers. The altered surface climate response to ENSO in Australia by AMV is attributed to variations in large-scale atmospheric circulation. Under AMV+, there is increased subsidence over western Australia during El Niño associated with a westward shift of the local Walker circulation. A weakening of the upwelling branch of the local Hadley circulation over north-eastern Australia is responsible for the weakening of La Niña impacts in AMV+, accompanied by a strengthening of subsidence in south central Australia due to a weakening of the local Hadley circulation, amplifying La Niña impacts over this region. The results suggest the potential for AMV to drive multidecadal variability in ENSO impacts over Australia.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1748-9326
Relation: https://doaj.org/toc/1748-9326
DOI: 10.1088/1748-9326/ace920
URL الوصول: https://doaj.org/article/5c1d8c755afa4ee289766805c9602a8a
رقم الأكسشن: edsdoj.5c1d8c755afa4ee289766805c9602a8a
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:17489326
DOI:10.1088/1748-9326/ace920