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Dominant Processes for Dependence of Boreal Summer Intraseasonal Oscillation on El Nino Phases

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Title
Dominant Processes for Dependence of Boreal Summer Intraseasonal Oscillation on El Nino Phases
Author(s)
Lee, Doo Young; June-Yi Lee; Yang, Young-Min; Hsu, Pang-Chi; Ji-Eun Kim
Publication Date
2022-07
Journal
GEOPHYSICAL RESEARCH LETTERS, v.49, no.14
Publisher
AMER GEOPHYSICAL UNION
Abstract
Boreal summer intraseasonal oscillation (BSISO) strongly interacts with background mean fields and tends to be stronger and longer in its northward propagation during La Nina than El Nino summers. However, BSISO dependence on El Nino-Southern Oscillation phase has not been well understood. Here, we show that BSISO-related convections are stronger and more organized with northward propagation on 30-60-day timescales during El Nino developing (E-DV) than decaying (E-DC) summers over the western Pacific. The easterly vertical shear, responsible for the next vorticity generation north of the BSISO convection, in the E-DV (E-DC) remarkably increases (decreases) due to the enhanced (weakened) upper-level easterly anomaly. The air-sea interaction in E-DV gets stronger due to the larger meridional gradient of sea surface temperature, amplifying northward propagation than in E-DC.
URI
https://pr.ibs.re.kr/handle/8788114/12291
DOI
10.1029/2022GL098669
ISSN
0094-8276
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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