DOI: 10.1175/JCLI-D-18-0072.1
Scopus记录号: 2-s2.0-85058813820
论文题名: Evaluation of the quasi-biweekly oscillation over the South China sea in early and late summer in CAM5
作者: Wang X. ; Zhang G.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2019
卷: 32, 期: 1 起始页码: 69
结束页码: 84
语种: 英语
Scopus关键词: Advection
; Budget control
; Tropical engineering
; Community atmosphere model
; General circulation model
; Geographical locations
; Horizontal advection
; Intraseasonal oscillations
; National center for atmospheric researches
; Realistic simulation
; Tropical atmospheres
; Vorticity
; advection
; atmospheric circulation
; climate modeling
; Coriolis force
; eddy
; general circulation model
; simulation
; spatial distribution
; summer
; vorticity
; Pacific Ocean
; South China Sea
英文摘要: Low-frequency intraseasonal oscillations in the tropical atmosphere in general circulation models (GCMs) were studied extensively in many previous studies. However, the simulation of the quasi-biweekly oscillation (QBWO), which is an important component of the intraseasonal oscillations, in GCMs has not received much attention. This paper evaluates the QBWO features over the South China Sea in early [May-June (MJ)] and late [August-September (AS)] summer in the National Center for Atmospheric Research (NCAR) Community Atmosphere Model, version 5.3 (CAM5), using observations and reanalysis data. Results show that the major features of the spatial distribution of the QBWO in both MJ and AS are simulated reasonably well by the model, although the amplitude of the variation is overestimated.CAM5captures the local oscillation in MJ and the westward propagation in AS of the QBWO. Although there are important biases in geographical location and intensity in MJ, the model represents the QBWO horizontal and vertical structure qualitatively well in AS. The diagnosis of the eddy vorticity budget is conducted to better understand theQBWOactivities in the model. Both horizontal advection of relative vorticity and that of planetary vorticity (Coriolis parameter) are important for the local evolution of the QBWO in MJ in observations as well as model simulation, whereas advection of planetary vorticity contributes to the westward propagation of QBWO vorticity anomalies in AS. Since the Coriolis parameter f only changes with latitude, this suggests that the correct simulation of anomalous meridional wind is a key factor in the realistic simulation of theQBWOin the model. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117263
Appears in Collections: 气候变化与战略
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Recommended Citation:
Wang X.,Zhang G.J.. Evaluation of the quasi-biweekly oscillation over the South China sea in early and late summer in CAM5[J]. Journal of Climate,2019-01-01,32(1)