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Cross‐Equatorial Surges Boost MJO's Southward Detour Over the Maritime Continent

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2023GL104770· OSTI ID:1993324
 [1];  [1];  [1];  [1];  [1]
  1. Pacific Northwest National Laboratory Richland WA USA
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Abstract

The influence of the cross‐equatorial northerly surge (CES) on the eastward propagation of Madden‐Julian oscillation (MJO) during boreal winter is evaluated through the analysis of the column integrated moisture budget. Results show that the CES reinforces MJO's southward detour by increasing horizontal moisture convergence over the southern Maritime Continent (MC) region. Further analysis reveals that the zonal convergence by intraseasonal zonal wind anomalies acting upon background moisture is intensified in the presence of CES events, causing a stronger convective activity in the southern MC (SMC). The stronger moisture convergence in the SMC is associated with the CES‐induced intensification of low‐level northwesterly and westerly winds, which, in turn, strengthen zonal wind convergences and positive wind‐evaporation feedbacks onto the MJO convection. An improved process understanding of the link between the CES and MJO detours can help engender improvements in extreme weather forecasts and aid investigation biases in simulating MJO in climate models.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231; AC05-76RL01830
OSTI ID:
1993324
Alternate ID(s):
OSTI ID: 1993325
OSTI ID: 1999245
Report Number(s):
PNNL-SA--185613; e2023GL104770
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 15 Vol. 50; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

References (27)

The impact of the diurnal cycle on the propagation of M adden‐ J ulian O scillation convection across the M aritime C ontinent journal October 2016
Why does the MJO detour the Maritime Continent during austral summer? journal March 2017
Impact of cold surges on the Madden-Julian oscillation propagation over the Maritime Continent journal September 2018
The modulating influence of convectively coupled equatorial waves (CCEWs) on the variability of tropical precipitation: THE MODULATING INFLUENCE OF CCEWS ON TROPICAL PRECIPITATION journal June 2014
The ERA5 global reanalysis journal June 2020
Equatorial Rossby waves on cold surge days and their impact on rainfall journal June 2023
Integrated Multi-satellite Retrievals for the Global Precipitation Measurement (GPM) Mission (IMERG) book January 2020
Tracking of Tropical Intraseasonal Convective Anomalies: 1. Seasonality of the Tropical Intraseasonal Oscillations journal February 2020
Changes to the Madden‐Julian Oscillation in Coupled and Uncoupled Aquaplanet Simulations With 4xCO 2 journal August 2020
Record‐Breaking Precipitation in Indonesia's Capital of Jakarta in Early January 2020 Linked to the Northerly Surge, Equatorial Waves, and MJO journal November 2022
Moisture Modes and the Eastward Propagation of the MJO journal January 2013
Surface Fluxes and Ocean Coupling in the Tropical Intraseasonal Oscillation journal November 2004
Role of the Boundary Layer Moisture Asymmetry in Causing the Eastward Propagation of the Madden–Julian Oscillation journal July 2012
Impacts of Boreal Winter Monsoon Cold Surges and the Interaction with MJO on Southeast Asia Rainfall journal May 2017
Oceanic Impacts on MJOs Detouring near the Maritime Continent journal March 2020
The Role of Background Meridional Moisture Gradient on the Propagation of the MJO over the Maritime Continent journal May 2021
Cold Surge Pathways in East Asia and Their Tropical Impacts journal January 2021
Seasonal Locking of the MJO’s Southward Detour of the Maritime Continent: The Role of the Australian Monsoon journal December 2022
Synoptic Disturbances over the Equatorial South China Sea and Western Maritime Continent during Boreal Winter journal March 2005
Subseasonal Dynamical Prediction of East Asian Cold Surges journal August 2017
Seasonal Dependence of Cold Surges and their Interaction with the Madden–Julian Oscillation over Southeast Asia journal March 2020
Equatorial Waves Triggering Extreme Rainfall and Floods in Southwest Sulawesi, Indonesia journal May 2021
Bootstrap Methods: Another Look at the Jackknife journal January 1979
The Cross-Equatorial Northerly Surge over the Maritime Continent and Its Relationship to Precipitation Patterns journal January 2011
The Impact of Trans-equatorial Monsoon Flow on the Formation of Repeated Torrential Rains over Java Island journal January 2007
The Effects of an Active Phase of the Madden-Julian Oscillation on the Extreme Precipitation Event over Western Java Island in January 2013 journal January 2013
Early morning peaks in the diurnal cycle of precipitation over the northern coast of West Java and possible influencing factors journal February 2020

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Related Subjects

58 GEOSCIENCES
Madden-Julian Oscillation
intraseasonal variability
maritime continent
moisture
moisture budget
monsoons
seasonal cycle