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Tropical Anomalies Associated with the Interannual Variability of the Cross-Equatorial Flows over the Maritime Continent in Boreal Summer

Xiaoxuan ZhaoaNansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

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Riyu LubState Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
cCollege of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China

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Buwen DongdDepartment of Meteorology, National Centre for Atmospheric Science, University of Reading, Reading, United Kingdom

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Xiaowei HongeClimate Change Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

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Junqi LiubState Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
cCollege of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China

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Jianqi SunaNansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
cCollege of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China

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Online Publication:
05 Aug 2022
Print Publication:
01 Sep 2022
DOI:
https://doi.org/10.1175/JCLI-D-21-0764.1
Page(s):
5591–5603
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Abstract

In this study, we investigate circulation, convection, and sea surface temperature (SST) anomalies associated with interannual variability of the cross-equatorial flow (CEF) intensity over the Maritime Continent (MC) in boreal summer. Observational diagnostics show that strengthened CEF is associated with large-scale circulation anomalies featuring weakened Walker circulation, upper-level northeasterly anomalies across the MC, and lower-level cyclonic anomalies over the tropical western North Pacific (WNP). Further analyses indicate that strengthened CEF is associated with both La Niña–like SST anomalies in the preceding winter and El Niño–like SST anomalies in the simultaneous summer. These relationships between CEF and ENSO are established by two key convection regions: enhanced convection over WNP and depressed convection over the MC. A linear baroclinic model is applied here to further discuss the causality between circulation and convection. Results suggest that both the WNP heating and MC cooling can induce the strengthened CEF. Moreover, the stability of the relationship between CEF and El Niño–Southern Oscillation (ENSO) is also discussed. Results show that the relationship between CEF and SST anomalies in the simultaneous summer is stable and remains significant, whereas that between CEF and SST anomalies in the preceding winter experienced a decadal strengthening around 1997/98 from insignificant to significant. After 1998, the preceding winter ENSO is followed by strong summer SST anomalies in the MC that significantly affect CEF via modulating local convection. However, this ENSO–summer MC SST relationship is weak before 1997, failing to establish the relationship between the preceding ENSO and CEF.

© 2022 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Riyu Lu, lr@mail.iap.ac.cn

Abstract

In this study, we investigate circulation, convection, and sea surface temperature (SST) anomalies associated with interannual variability of the cross-equatorial flow (CEF) intensity over the Maritime Continent (MC) in boreal summer. Observational diagnostics show that strengthened CEF is associated with large-scale circulation anomalies featuring weakened Walker circulation, upper-level northeasterly anomalies across the MC, and lower-level cyclonic anomalies over the tropical western North Pacific (WNP). Further analyses indicate that strengthened CEF is associated with both La Niña–like SST anomalies in the preceding winter and El Niño–like SST anomalies in the simultaneous summer. These relationships between CEF and ENSO are established by two key convection regions: enhanced convection over WNP and depressed convection over the MC. A linear baroclinic model is applied here to further discuss the causality between circulation and convection. Results suggest that both the WNP heating and MC cooling can induce the strengthened CEF. Moreover, the stability of the relationship between CEF and El Niño–Southern Oscillation (ENSO) is also discussed. Results show that the relationship between CEF and SST anomalies in the simultaneous summer is stable and remains significant, whereas that between CEF and SST anomalies in the preceding winter experienced a decadal strengthening around 1997/98 from insignificant to significant. After 1998, the preceding winter ENSO is followed by strong summer SST anomalies in the MC that significantly affect CEF via modulating local convection. However, this ENSO–summer MC SST relationship is weak before 1997, failing to establish the relationship between the preceding ENSO and CEF.

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Corresponding author: Riyu Lu, lr@mail.iap.ac.cn
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