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Title: Sensitivity of MJO propagation to a robust positive Indian Ocean dipole event in the superparameterized CAM: SIMULATED MJO AND IOD

Abstract

The superparameterized Community Atmosphere Model (SPCAM) is used to investigate the impact and geographic sensitivity of positive Indian Ocean Dipole (+IOD) sea-surface temperatures (SSTs) on Madden-Julian oscillation (MJO) propagation. The goal is to clarify potentially appreciable +IOD effects on MJO dynamics detected in prior studies by using a global model with explicit convection representation. Prescribed climatological October SSTs and variants of the SST distribution from October 2006, a +IOD event, force the model. Modest MJO convection weakening over the Maritime Continent occurs when either climatological SSTs, or +IOD SST anomalies restricted to the Indian Ocean, are applied. However, severe MJO weakening occurs when either +IOD SST anomalies are applied globally or restricted to the equatorial Pacific. MJO disruption is associated with time-mean changes in the zonal wind profile and lower moist static energy (MSE) in subsiding air masses imported from the Subtropics by Rossby-like gyres. On intraseasonal scales, MJO disruption arises from significantly smaller MSE accumulation, weaker meridional advective moistening, and overactive submonthly eddies that mix drier subtropical air into the path of MJO convection. These results (1) demonstrate that SPCAM reproduces observed time-mean and intraseasonal changes during +IOD episodes, (2) reaffirm the role that submonthly eddies play in MJOmore » propagation and show that such multiscale interactions are sensitive to interannual SST states, and (3) suggest that boreal fall +IOD SSTs local to the Indian Ocean have a significantly smaller impact on Maritime Continent MJO propagation compared to contemporaneous Pacific SST anomalies which, for October 2006, resemble El Ninõ-like conditions.« less

Authors:
 [1];  [2];  [3]
  1. Department of Climate Sciences, Lawrence Berkeley National Laboratory, Berkeley California USA, Now at Rosenstiel School of Marine and Atmospheric Science, University of Miami, Florida USA
  2. Department of Earth System Science, University of California-Irvine, Irvine California USA
  3. Department of Climate Sciences, Lawrence Berkeley National Laboratory, Berkeley California USA, Department of Earth and Planetary Science, University of California-Berkeley, Berkeley California USA
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
OSTI Identifier:
1235487
Alternate Identifier(s):
OSTI ID: 1378676
Grant/Contract Number:  
SC0012152; SC0012548; AC02-05CH11231
Resource Type:
Journal Article: Published Article
Journal Name:
Journal of Advances in Modeling Earth Systems
Additional Journal Information:
Journal Volume: 7; Journal Issue: 4; Journal ID: ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; Madden-Julian oscillation; intraseasonal variability; superparameterization; Indian Ocean dipole; tropical convection; ENSO

Citation Formats

Benedict, James J., Pritchard, Michael S., and Collins, William D. Sensitivity of MJO propagation to a robust positive Indian Ocean dipole event in the superparameterized CAM: SIMULATED MJO AND IOD. United States: N. p., 2015. Web. doi:10.1002/2015MS000530.
Benedict, James J., Pritchard, Michael S., & Collins, William D. Sensitivity of MJO propagation to a robust positive Indian Ocean dipole event in the superparameterized CAM: SIMULATED MJO AND IOD. United States. https://doi.org/10.1002/2015MS000530
Benedict, James J., Pritchard, Michael S., and Collins, William D. 2015. "Sensitivity of MJO propagation to a robust positive Indian Ocean dipole event in the superparameterized CAM: SIMULATED MJO AND IOD". United States. https://doi.org/10.1002/2015MS000530.
@article{osti_1235487,
title = {Sensitivity of MJO propagation to a robust positive Indian Ocean dipole event in the superparameterized CAM: SIMULATED MJO AND IOD},
author = {Benedict, James J. and Pritchard, Michael S. and Collins, William D.},
abstractNote = {The superparameterized Community Atmosphere Model (SPCAM) is used to investigate the impact and geographic sensitivity of positive Indian Ocean Dipole (+IOD) sea-surface temperatures (SSTs) on Madden-Julian oscillation (MJO) propagation. The goal is to clarify potentially appreciable +IOD effects on MJO dynamics detected in prior studies by using a global model with explicit convection representation. Prescribed climatological October SSTs and variants of the SST distribution from October 2006, a +IOD event, force the model. Modest MJO convection weakening over the Maritime Continent occurs when either climatological SSTs, or +IOD SST anomalies restricted to the Indian Ocean, are applied. However, severe MJO weakening occurs when either +IOD SST anomalies are applied globally or restricted to the equatorial Pacific. MJO disruption is associated with time-mean changes in the zonal wind profile and lower moist static energy (MSE) in subsiding air masses imported from the Subtropics by Rossby-like gyres. On intraseasonal scales, MJO disruption arises from significantly smaller MSE accumulation, weaker meridional advective moistening, and overactive submonthly eddies that mix drier subtropical air into the path of MJO convection. These results (1) demonstrate that SPCAM reproduces observed time-mean and intraseasonal changes during +IOD episodes, (2) reaffirm the role that submonthly eddies play in MJO propagation and show that such multiscale interactions are sensitive to interannual SST states, and (3) suggest that boreal fall +IOD SSTs local to the Indian Ocean have a significantly smaller impact on Maritime Continent MJO propagation compared to contemporaneous Pacific SST anomalies which, for October 2006, resemble El Ninõ-like conditions.},
doi = {10.1002/2015MS000530},
url = {https://www.osti.gov/biblio/1235487}, journal = {Journal of Advances in Modeling Earth Systems},
issn = {1942-2466},
number = 4,
volume = 7,
place = {United States},
year = {Mon Nov 23 00:00:00 EST 2015},
month = {Mon Nov 23 00:00:00 EST 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1002/2015MS000530

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Cited by: 20 works
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