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Amplitude-dependent relationship between the Southern Annular Mode and the El Nino Southern Oscillation in austral summer

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Title
Amplitude-dependent relationship between the Southern Annular Mode and the El Nino Southern Oscillation in austral summer
Other Titles
남반구 여름철 동안 남극진동과 엘니뇨 남방진동 사이의 진폭 의존 관계
Authors
Kim, Baek-Min
Choi, Wookap
Kim, Seong-Joong
Choi, Hyesun
Subject
Meteorology & Atmospheric Sciences
Keywords
El Nino Southern Oscillation; Southern Hemisphere sub-polar jet; SouthernAnnular Mode
Issue Date
2017
Citation
Kim, Baek-Min, et al. 2017. "Amplitude-dependent relationship between the Southern Annular Mode and the El Nino Southern Oscillation in austral summer". ASIA-PACIFIC JOURNAL OF ATMOSPHERIC SCIENCES, 53(1): 85-100.
Abstract
Co-variability between the Southern Annular Mode (SAM) and the El Nino Southern Oscillation (ENSO) during the austral summer is examined, and it is found that there exists an apparent co-variability of a negative (positive) SAM during the mature period of El Nino (La Nina). However, this co-variability is largely controlled by the small number of strong ENSO cases. When strong ENSO cases are excluded, the correlation becomes nonsignificant. This behavior in the relationship between SAM and ENSO is supported by a series of general circulation model experiments with prescribed sea surface temperature boundary conditions that represent the incremental strengthening of El Nino (La Nina) conditions. The modeled Antarctic sub-polar jet exhibits similar behavior to that identified through observational analysis. Marked changes in both the magnitude and position of the sub-polar jet are largely controlled by particularly strong transient eddy forcing. Planetary wave forcing plays only a minor role in the co-variability, but it can explain in part the asymmetric response of the sub-polar jet between El Nino and La Nina.
URI
http://repository.kopri.re.kr/handle/201206/5694
DOI
http://dx.doi.org/10.1007/s13143-017-0007-6
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