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Title: Moist thermodynamics of the Madden-Julian Oscillation in a cloud resolving simulation

Abstract

The moist thermodynamic processes that determine the scale and energy of the Madden-Julian Oscillation are investigated using moisture and eddy available potential energy (EAPE) budget analyses on a high resolution regional model simulation. The two MJO episodes observed during the winter of 2007-2008 are realistically simulated. In the model, small differences among the timescales of convective vertical transport, mixing and condensation of moisture determine the timescale of MJO moistening. Furthermore, various cloud types play a damping or destabilizing contribution role in the EAPE budget of the MJO, depending on their characteristic latent heating profile and its covariance with the temperature fluctuations. The results are used identify possible sources of the difficulties in simulating MJO in low resolution models that rely on cumulus parameterizations.

Authors:
;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1029049
Report Number(s):
PNNL-SA-76338
Journal ID: ISSN 0894-8755; JLCLEL; KP1701000; TRN: US201122%%680
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Climate
Additional Journal Information:
Journal Volume: 24; Journal Issue: 21; Journal ID: ISSN 0894-8755
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; CLOUDS; DAMPING; FLUCTUATIONS; HEATING; MOISTURE; OSCILLATIONS; POTENTIAL ENERGY; RESOLUTION; SIMULATION; THERMODYNAMICS; TRANSPORT

Citation Formats

Hagos, Samson M, and Leung, Lai-Yung R. Moist thermodynamics of the Madden-Julian Oscillation in a cloud resolving simulation. United States: N. p., 2011. Web. doi:10.1175/2011JCLI4212.1.
Hagos, Samson M, & Leung, Lai-Yung R. Moist thermodynamics of the Madden-Julian Oscillation in a cloud resolving simulation. United States. doi:10.1175/2011JCLI4212.1.
Hagos, Samson M, and Leung, Lai-Yung R. Mon . "Moist thermodynamics of the Madden-Julian Oscillation in a cloud resolving simulation". United States. doi:10.1175/2011JCLI4212.1.
@article{osti_1029049,
title = {Moist thermodynamics of the Madden-Julian Oscillation in a cloud resolving simulation},
author = {Hagos, Samson M and Leung, Lai-Yung R},
abstractNote = {The moist thermodynamic processes that determine the scale and energy of the Madden-Julian Oscillation are investigated using moisture and eddy available potential energy (EAPE) budget analyses on a high resolution regional model simulation. The two MJO episodes observed during the winter of 2007-2008 are realistically simulated. In the model, small differences among the timescales of convective vertical transport, mixing and condensation of moisture determine the timescale of MJO moistening. Furthermore, various cloud types play a damping or destabilizing contribution role in the EAPE budget of the MJO, depending on their characteristic latent heating profile and its covariance with the temperature fluctuations. The results are used identify possible sources of the difficulties in simulating MJO in low resolution models that rely on cumulus parameterizations.},
doi = {10.1175/2011JCLI4212.1},
journal = {Journal of Climate},
issn = {0894-8755},
number = 21,
volume = 24,
place = {United States},
year = {2011},
month = {10}
}