DOI: 10.1175/JCLI-D-13-00269.1
Scopus记录号: 2-s2.0-84896075417
论文题名: The dependence of ITCZ structure on model resolution and dynamical core in aquaplanet simulations
作者: Landu K. ; Leung L.R. ; Hagos S. ; Vinoj V. ; Rauscher S.A. ; Ringler T. ; Taylor M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 6 起始页码: 2375
结束页码: 2385
语种: 英语
Scopus关键词: Atmospheric humidity
; Atmospherics
; Climate models
; Feedback
; Oceanography
; Waves
; Community atmosphere model
; Convective available potential energies
; High-order methods
; Intertropical convergence zone
; Large-scale circulation
; Latent heat release
; Latitudinal distribution
; Sea surface temperature (SST)
; Computer simulation
; air temperature
; atmospheric convection
; atmospheric wave
; climate modeling
; computer simulation
; humidity
; intertropical convergence zone
; latent heat flux
; precipitation assessment
; sea surface temperature
; troposphere
英文摘要: Aquaplanet simulations using the Community Atmosphere Model, version 4 (CAM4), with the Model for Prediction Across Scales-Atmosphere (MPAS-A) and High-Order Method Modeling Environment (HOMME) dynamical cores and using zonally symmetric sea surface temperature (SST) structure are studied to understand the dependence of the intertropical convergence zone (ITCZ) structure on resolution and dynamical core. While all resolutions in HOMME and the low-resolution MPAS-A simulations give a single equatorial peak in zonal mean precipitation, the high-resolution MPAS-A simulations give a double ITCZ with precipitation peaking around 28-38 on either side of the equator. This study reveals that the structure of ITCZ is dependent on the feedbacks between convection and large-scale circulation. It is shown that the difference in specific humidity betweenHOMMEandMPAS-A can lead to different latitudinal distributions of the convective available potential energy (CAPE) by influencing latent heat release by clouds and the upper-tropospheric temperature. With lower specific humidity, the high-resolution MPAS-A simulation has CAPE increasing away from the equator that enhances convection away from the equator and, through a positive feedback on the circulation, results in a double ITCZ structure. In addition, it is shown that the dominance of antisymmetric waves in the model is not enough to cause double ITCZ, and the lateral extent of equatorial waves does not play an important role in determining the width of the ITCZ but rather the latter may influence the former. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51175
Appears in Collections: 气候变化事实与影响
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作者单位: Pacific Northwest National Laboratory, Richland, WA, United States; Los Alamos National Laboratory, Los Alamos, NM, United States; Sandia National Laboratory, Albuquerque, NM, United States
Recommended Citation:
Landu K.,Leung L.R.,Hagos S.,et al. The dependence of ITCZ structure on model resolution and dynamical core in aquaplanet simulations[J]. Journal of Climate,2014-01-01,27(6)