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Title: Role of Maritime Continent Land Convection on the Mean State and MJO Propagation

Abstract

The Maritime Continent (MC) region is known as a ‘barrier’ in the life-cycle of the Madden-Julian oscillation (MJO). During boreal winter, the MJO detours the equatorial MC land region southward and propagates through the oceanic region. Also, about half of the MJO events that initiate over the Indian Ocean cease around the MC. The mechanism through which the MC affects MJO propagation, however, has remained unanswered. The current study investigates the MJO-MC interaction with a particular focus on the role of MC land convection. Using a global climate model that simulates both mean climate and MJO realistically, we performed two sensitivity experiments in which updraft plume radius is set to its maximum and minimum value only in the MC land grid points, making convective top deeper and shallower, respectively. In this work, our results show that MC land convection plays a key role in shaping the 3-D climatological moisture distribution around the MC through its local and non-local effects. Shallower and weaker MC land convection results in a steepening of the vertical and meridional mean moisture gradient over the MC region. The opposite is the case when MC land convection becomes deeper and stronger. The MJO’s eastward propagation is enhancedmore » (suppressed) with the steeper (lower) mean moisture gradient. The moist static energy (MSE) budget of the MJO reveals the vertical and meridional advection of the mean MSE by MJO wind anomalies as the key processes that are responsible for the changes in MJO propagation characteristics. Our results pinpoint the critical role of the background moisture gradient on MJO propagation.« less

Authors:
 [1];  [2];  [3];  [4]
+ Show Author Affiliations
  1. Univ. of Washington, Seattle, WA (United States); Chonnam National Univ., Gwangju (Korea, Republic of)
  2. Univ. of Washington, Seattle, WA (United States)
  3. Chonnam National Univ., Gwangju (Korea, Republic of)
  4. Seoul National Univ. (Korea, Republic of)
Publication Date:
Research Org.:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division; National Oceanic and Atmospheric Administration (NOAA); National Aeronautics and Space Administration (NASA); National Research Foundation of Korea (NRF); Korean Meteorological Administration; National Science Foundation (NSF)
OSTI Identifier:
1659514
Alternate Identifier(s):
OSTI ID: 1908829
Grant/Contract Number:  
SC0016223; NA18OAR4310300; 80NSSC17K0227; KMI2018-03110; SC0019495
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Climate
Additional Journal Information:
Journal Volume: 33; Journal Issue: 5; Journal ID: ISSN 0894-8755
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Madden-Julian oscillation; General circulation models; Intraseasonal variability; Tropical variability

Citation Formats

Ahn, Min-Seop, Kim, Daehyun, Ham, Yoo-Geun, and Park, Sungsu. Role of Maritime Continent Land Convection on the Mean State and MJO Propagation. United States: N. p., 2020. Web. doi:10.1175/JCLI-D-19-0342.1.
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Ahn, Min-Seop, Kim, Daehyun, Ham, Yoo-Geun, & Park, Sungsu. Role of Maritime Continent Land Convection on the Mean State and MJO Propagation. United States. https://doi.org/10.1175/JCLI-D-19-0342.1
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Ahn, Min-Seop, Kim, Daehyun, Ham, Yoo-Geun, and Park, Sungsu. Wed . "Role of Maritime Continent Land Convection on the Mean State and MJO Propagation". United States. https://doi.org/10.1175/JCLI-D-19-0342.1. https://www.osti.gov/servlets/purl/1659514.
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@article{osti_1659514,
title = {Role of Maritime Continent Land Convection on the Mean State and MJO Propagation},
author = {Ahn, Min-Seop and Kim, Daehyun and Ham, Yoo-Geun and Park, Sungsu},
abstractNote = {The Maritime Continent (MC) region is known as a ‘barrier’ in the life-cycle of the Madden-Julian oscillation (MJO). During boreal winter, the MJO detours the equatorial MC land region southward and propagates through the oceanic region. Also, about half of the MJO events that initiate over the Indian Ocean cease around the MC. The mechanism through which the MC affects MJO propagation, however, has remained unanswered. The current study investigates the MJO-MC interaction with a particular focus on the role of MC land convection. Using a global climate model that simulates both mean climate and MJO realistically, we performed two sensitivity experiments in which updraft plume radius is set to its maximum and minimum value only in the MC land grid points, making convective top deeper and shallower, respectively. In this work, our results show that MC land convection plays a key role in shaping the 3-D climatological moisture distribution around the MC through its local and non-local effects. Shallower and weaker MC land convection results in a steepening of the vertical and meridional mean moisture gradient over the MC region. The opposite is the case when MC land convection becomes deeper and stronger. The MJO’s eastward propagation is enhanced (suppressed) with the steeper (lower) mean moisture gradient. The moist static energy (MSE) budget of the MJO reveals the vertical and meridional advection of the mean MSE by MJO wind anomalies as the key processes that are responsible for the changes in MJO propagation characteristics. Our results pinpoint the critical role of the background moisture gradient on MJO propagation.},
doi = {10.1175/JCLI-D-19-0342.1},
journal = {Journal of Climate},
number = 5,
volume = 33,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 2020},
month = {Wed Jan 01 00:00:00 EST 2020}
}
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