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DOI | 10.1175/JCLI-D-18-0072.1 |
Evaluation of the Quasi-Biweekly Oscillation over the South China Sea in Early and Late Summer in CAM5 | |
Wang, Xu1,2; Zhang, Guang J.1,3 | |
2019 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2019 |
卷号 | 32期号:1页码:69-84 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
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. CAM5 captures 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 the QBWO activities 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 the QBWO in the model. |
英文关键词 | Climate models Intraseasonal variability Tropical variability |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000452132400005 |
WOS关键词 | WESTERN NORTH PACIFIC ; SUBTROPICAL WIND MAXIMA ; PART I ; INTRASEASONAL VARIABILITY ; CLIMATE SIMULATIONS ; MONSOONAL INFLUENCE ; ZONAL WIND ; EAST-ASIA ; CIRCULATION ; CONVECTION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/19858 |
专题 | 气候变化 |
作者单位 | 1.Tsinghua Univ, Dept Earth Syst Sci, Minist Educ, Key Lab Earth Syst Modeling, Beijing, Peoples R China; 2.Joint Ctr Global Change Studies, Beijing, Peoples R China; 3.Scripps Inst Oceanog, La Jolla, CA 92093 USA |
推荐引用方式 GB/T 7714 | Wang, Xu,Zhang, Guang J.. Evaluation of the Quasi-Biweekly Oscillation over the South China Sea in Early and Late Summer in CAM5[J]. JOURNAL OF CLIMATE,2019,32(1):69-84. |
APA | Wang, Xu,&Zhang, Guang J..(2019).Evaluation of the Quasi-Biweekly Oscillation over the South China Sea in Early and Late Summer in CAM5.JOURNAL OF CLIMATE,32(1),69-84. |
MLA | Wang, Xu,et al."Evaluation of the Quasi-Biweekly Oscillation over the South China Sea in Early and Late Summer in CAM5".JOURNAL OF CLIMATE 32.1(2019):69-84. |
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