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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

Journal Article · · Journal of Advances in Modeling Earth Systems
DOI:https://doi.org/10.1002/2015MS000530· OSTI ID:1235487
 [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
+ Show Author Affiliations

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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Grant/Contract Number:
SC0012152; SC0012548; AC02-05CH11231
OSTI ID:
1235487
Alternate ID(s):
OSTI ID: 1378676
Journal Information:
Journal of Advances in Modeling Earth Systems, Vol. 7, Issue 4; ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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54 ENVIRONMENTAL SCIENCES
58 GEOSCIENCES
Madden-Julian oscillation
intraseasonal variability
superparameterization
Indian Ocean dipole
tropical convection
ENSO