Comparison of Moist Static Energy and Budget between the GCM-Simulated Madden–Julian Oscillation and Observations over the Indian Ocean and Western PacificSource: Journal of Climate:;2013:;volume( 026 ):;issue: 014::page 4981DOI: 10.1175/JCLI-D-12-00607.1Publisher: American Meteorological Society
Abstract: he moist static energy (MSE) anomalies and MSE budget associated with the Madden?Julian oscillation (MJO) simulated in the Iowa State University General Circulation Model (ISUGCM) over the Indian and Pacific Oceans are compared with observations. Different phase relationships between MJO 850-hPa zonal wind, precipitation, and surface latent heat flux are simulated over the Indian Ocean and western Pacific, which are greatly influenced by the convection closure, trigger conditions, and convective momentum transport (CMT). The moist static energy builds up from the lower troposphere 15?20 days before the peak of MJO precipitation, and reaches the maximum in the middle troposphere (500?600 hPa) near the peak of MJO precipitation. The gradual lower-tropospheric heating and moistening and the upward transport of moist static energy are important aspects of MJO events, which are documented in observational studies but poorly simulated in most GCMs. The trigger conditions for deep convection, obtained from the year-long cloud-resolving model (CRM) simulations, contribute to the striking difference between ISUGCM simulations with the original and modified convection schemes and play the major role in the improved MJO simulation in ISUGCM. Additionally, the budget analysis with the ISUGCM simulations shows the increase in MJO MSE is in phase with the horizontal advection of MSE over the western Pacific, while out of phase with the horizontal advection of MSE over the Indian Ocean. However, the NCEP analysis shows that the tendency of MJO MSE is in phase with the horizontal advection of MSE over both oceans.
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contributor author | Wu, Xiaoqing | |
contributor author | Deng, Liping | |
date accessioned | 2017-06-09T17:07:31Z | |
date available | 2017-06-09T17:07:31Z | |
date copyright | 2013/07/01 | |
date issued | 2013 | |
identifier issn | 0894-8755 | |
identifier other | ams-79757.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4222572 | |
description abstract | he moist static energy (MSE) anomalies and MSE budget associated with the Madden?Julian oscillation (MJO) simulated in the Iowa State University General Circulation Model (ISUGCM) over the Indian and Pacific Oceans are compared with observations. Different phase relationships between MJO 850-hPa zonal wind, precipitation, and surface latent heat flux are simulated over the Indian Ocean and western Pacific, which are greatly influenced by the convection closure, trigger conditions, and convective momentum transport (CMT). The moist static energy builds up from the lower troposphere 15?20 days before the peak of MJO precipitation, and reaches the maximum in the middle troposphere (500?600 hPa) near the peak of MJO precipitation. The gradual lower-tropospheric heating and moistening and the upward transport of moist static energy are important aspects of MJO events, which are documented in observational studies but poorly simulated in most GCMs. The trigger conditions for deep convection, obtained from the year-long cloud-resolving model (CRM) simulations, contribute to the striking difference between ISUGCM simulations with the original and modified convection schemes and play the major role in the improved MJO simulation in ISUGCM. Additionally, the budget analysis with the ISUGCM simulations shows the increase in MJO MSE is in phase with the horizontal advection of MSE over the western Pacific, while out of phase with the horizontal advection of MSE over the Indian Ocean. However, the NCEP analysis shows that the tendency of MJO MSE is in phase with the horizontal advection of MSE over both oceans. | |
publisher | American Meteorological Society | |
title | Comparison of Moist Static Energy and Budget between the GCM-Simulated Madden–Julian Oscillation and Observations over the Indian Ocean and Western Pacific | |
type | Journal Paper | |
journal volume | 26 | |
journal issue | 14 | |
journal title | Journal of Climate | |
identifier doi | 10.1175/JCLI-D-12-00607.1 | |
journal fristpage | 4981 | |
journal lastpage | 4993 | |
tree | Journal of Climate:;2013:;volume( 026 ):;issue: 014 | |
contenttype | Fulltext |