DOI: 10.1002/2014GL060662
论文题名: Simulation of monsoon intraseasonal oscillations in a coarse-resolution aquaplanet GCM
作者: Ajayamohan R.S. ; Khouider B. ; Majda A.J.
刊名: Geophysical Research Letters
ISSN: 0094-9882
EISSN: 1944-9613
出版年: 2014
卷: 41, 期: 15 起始页码: 5662
结束页码: 5669
语种: 英语
英文关键词: convective parameterization
; monsoon intraseasonal oscillations
; tropical convection
Scopus关键词: Atmospheric thermodynamics
; Climatology
; Computer simulation
; Parameterization
; Atmospheric temperature
; Flow patterns
; Mechanical waves
; Oceanography
; Surface waters
; Tropical engineering
; Convective parameterization
; Convective parameterization schemes
; Global climate model
; Intraseasonal oscillations
; Madden-Julian oscillation
; Parameterization schemes
; Sea surface temperature (SST)
; Tropical convection
; Convective events
; Convergence zones
; Seasonal migration
; Tropical engineering
; Climate models
; flow pattern
; global climate
; latitude
; monsoon
; oceanic convection
; parameterization
; Rossby wave
; sea surface temperature
; seasonal variation
; simulation
; Pacific Ocean
; Pacific Ocean (West)
; South Asia
英文摘要: The skill of the global climate models (GCMs) to realistically simulate the monsoon intraseasonal oscillations (MISOs) is related to the sensitivity of their convective parameterization schemes. Here we show that by coupling a simple multicloud parameterization to a coarse-resolution aquaplanet GCM, realistic MISOs can be simulated. We conduct three different simulations with a fixed nonhomogeneous sea surface temperature mimicking the Indian Ocean/western Pacific warm pool (WP) centered at the three latitudes 5°N, 10°N, and 15°N, respectively, to replicate the seasonal migration of the Tropical Convergence Zone (TCZ). This results in the generation of mean circulation resembling the monsoonal flow pattern in boreal summer. Succession of eastward propagating Madden-Julian Oscillation (MJO) disturbances with phase speed, amplitude, and structure similar to summer MJOs are simulated when the WP is at 5°N. When the WP is located over 10°N, northward and eastward propagating MISOs are simulated. This case captures the meridional seesaw of convection between continental and oceanic TCZ observed during boreal summer over South Asia. Westward propagating Rossby wave-like disturbances are simulated when the WP is over 15°N congruous with the synoptic disturbances seen over the monsoon trough. The initiation of intraseasonal oscillations in the model can occur internally through organization of convective events above the WP associated with internal dynamics. Key Points Monsoon ISO simulated using multicloud model Three-cloud structure, key for Monsoon ISOs A more realistic parameterization scheme for monsoon ISOs © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84905316152&doi=10.1002%2f2014GL060662&partnerID=40&md5=021b51be4d759ab891006e807e710a31
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7146
Appears in Collections: 气候减缓与适应
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作者单位: Center for Prototype Climate Modeling, New York University, Abu Dhabi, United Arab Emirates
Recommended Citation:
Ajayamohan R.S.,Khouider B.,Majda A.J.. Simulation of monsoon intraseasonal oscillations in a coarse-resolution aquaplanet GCM[J]. Geophysical Research Letters,2014-01-01,41(15).