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Title: MJO Propagation Across the Maritime Continent: Are CMIP6 Models Better Than CMIP5 Models?

Abstract

Many climate models struggle with a poor simulation of the Madden-Julian Oscillation (MJO), especially its propagation across the Maritime Continent (MC). This study quantitatively evaluates the robustness of MJO propagation over the MC in climate models that participated in Coupled Model Intercomparison Project phase 5 (CMIP5) and phase 6 (CMIP6) with a newly developed MC propagation metric. The results show that the CMIP6 models simulate MJO propagation over the MC more realistically than the CMIP5 models. Lower free-tropospheric moisture budget analysis highlights that the greater horizontal moisture advection is responsible for the enhanced MJO propagation over the MC. The increase in horizontal moisture advection in the CMIP6 models is mainly attributed to the steeper horizontal mean state moisture gradient around the MC, which is associated with the reduction of the equatorial dry bias.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [3];  [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]
  1. Department of Atmospheric SciencesUniversity of Washington Seattle WA USA, Department of OceanographyChonnam National University Gwangju South Korea
  2. Department of Atmospheric SciencesUniversity of Washington Seattle WA USA
  3. PCMDI, Lawrence Livermore National Laboratory Livermore CA USA
  4. Joint Institute for Regional Earth System Science and EngineeringUniversity of California Los Angeles CA USA, Jet Propulsion LaboratoryCalifornia Institute of Technology Pasadena CA USA
  5. Department of OceanographyChonnam National University Gwangju South Korea
  6. School of Marine and Atmospheric SciencesStony Brook University Stony Brook NY USA
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Washington, Seattle, WA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division
OSTI Identifier:
1632255
Alternate Identifier(s):
OSTI ID: 1623346; OSTI ID: 1632257; OSTI ID: 1659500
Report Number(s):
LLNL-JRNL-800820
Journal ID: ISSN 0094-8276
Grant/Contract Number:  
AC52‐07NA27344; SC0016223; AC52-07NA27344
Resource Type:
Published Article
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Name: Geophysical Research Letters Journal Volume: 47 Journal Issue: 11; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES

Citation Formats

Ahn, Min‐Seop, Kim, Daehyun, Kang, Daehyun, Lee, Jiwoo, Sperber, Kenneth R., Gleckler, Peter J., Jiang, Xianan, Ham, Yoo‐Geun, and Kim, Hyemi. MJO Propagation Across the Maritime Continent: Are CMIP6 Models Better Than CMIP5 Models?. United States: N. p., 2020. Web. doi:10.1029/2020GL087250.
Ahn, Min‐Seop, Kim, Daehyun, Kang, Daehyun, Lee, Jiwoo, Sperber, Kenneth R., Gleckler, Peter J., Jiang, Xianan, Ham, Yoo‐Geun, & Kim, Hyemi. MJO Propagation Across the Maritime Continent: Are CMIP6 Models Better Than CMIP5 Models?. United States. doi:https://doi.org/10.1029/2020GL087250
Ahn, Min‐Seop, Kim, Daehyun, Kang, Daehyun, Lee, Jiwoo, Sperber, Kenneth R., Gleckler, Peter J., Jiang, Xianan, Ham, Yoo‐Geun, and Kim, Hyemi. Mon . "MJO Propagation Across the Maritime Continent: Are CMIP6 Models Better Than CMIP5 Models?". United States. doi:https://doi.org/10.1029/2020GL087250.
@article{osti_1632255,
title = {MJO Propagation Across the Maritime Continent: Are CMIP6 Models Better Than CMIP5 Models?},
author = {Ahn, Min‐Seop and Kim, Daehyun and Kang, Daehyun and Lee, Jiwoo and Sperber, Kenneth R. and Gleckler, Peter J. and Jiang, Xianan and Ham, Yoo‐Geun and Kim, Hyemi},
abstractNote = {Many climate models struggle with a poor simulation of the Madden-Julian Oscillation (MJO), especially its propagation across the Maritime Continent (MC). This study quantitatively evaluates the robustness of MJO propagation over the MC in climate models that participated in Coupled Model Intercomparison Project phase 5 (CMIP5) and phase 6 (CMIP6) with a newly developed MC propagation metric. The results show that the CMIP6 models simulate MJO propagation over the MC more realistically than the CMIP5 models. Lower free-tropospheric moisture budget analysis highlights that the greater horizontal moisture advection is responsible for the enhanced MJO propagation over the MC. The increase in horizontal moisture advection in the CMIP6 models is mainly attributed to the steeper horizontal mean state moisture gradient around the MC, which is associated with the reduction of the equatorial dry bias.},
doi = {10.1029/2020GL087250},
journal = {Geophysical Research Letters},
number = 11,
volume = 47,
place = {United States},
year = {2020},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1029/2020GL087250

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