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DOI | 10.1175/JCLI-D-18-0567.1 |
Characterizing the North American Monsoon in the Community Atmosphere Model: Sensitivity to Resolution and Topography | |
Varuolo-Clarke, Arianna M.1,2,3; Reed, Kevin A.1; Medeiros, Brian4 | |
2019-12-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2019 |
卷号 | 32期号:23页码:8355-8372 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | This work examines the effect of horizontal resolution and topography on the North American monsoon (NAM) in experiments with an atmospheric general circulation model. Observations are used to evaluate the fidelity of the representation of the monsoon in simulations from the Community Atmosphere Model version 5 (CAM5) with a standard 1.0 degrees grid spacing and a high-resolution 0.25 degrees grid spacing. The simulated monsoon has some realistic features, but both configurations also show precipitation biases. The default 1.0 degrees grid spacing configuration simulates a monsoon with an annual cycle and intensity of precipitation within the observational range, but the monsoon begins and ends too gradually and does not reach far enough north. This study shows that the improved representation of topography in the high-resolution (0.25 degrees grid spacing) configuration improves the regional circulation and therefore some aspects of the simulated monsoon compared to the 1.0 degrees counterpart. At higher resolution, CAM5 simulates a stronger low pressure center over the American Southwest, with more realistic low-level wind flow than in the 1.0 degrees configuration. As a result, the monsoon precipitation increases as does the amplitude of the annual cycle of precipitation. A moisture analysis sheds light on the monsoon dynamics, indicating that changes in the advection of enthalpy and moist static energy drive the differences between monsoon precipitation in CAM5 1.0 degrees compared to the 0.25 degrees configuration. Additional simulations confirm that these improvements are mainly due to the topographic influence on the low-level flow through the Gulf of California, and not only the increase in horizontal resolution. |
英文关键词 | Orographic effects Monsoons Climatology Climate models |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000496297700002 |
WOS关键词 | WATER-VAPOR TRANSPORT ; HORIZONTAL RESOLUTION ; GLOBAL MONSOON ; CLIMATE ; VARIABILITY ; SIMULATION ; PLATEAU ; SOUTHWEST ; IMPACT |
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/225645 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.SUNY Stony Brook, Sch Marine & Atmospher Sci, Stony Brook, NY 11794 USA; 2.Columbia Univ, Lamont Doherty Earth Observ, New York, NY 10027 USA; 3.Columbia Univ, Dept Earth & Environm Sci, New York, NY 10027 USA; 4.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA |
推荐引用方式 GB/T 7714 | Varuolo-Clarke, Arianna M.,Reed, Kevin A.,Medeiros, Brian. Characterizing the North American Monsoon in the Community Atmosphere Model: Sensitivity to Resolution and Topography[J]. JOURNAL OF CLIMATE,2019,32(23):8355-8372. |
APA | Varuolo-Clarke, Arianna M.,Reed, Kevin A.,&Medeiros, Brian.(2019).Characterizing the North American Monsoon in the Community Atmosphere Model: Sensitivity to Resolution and Topography.JOURNAL OF CLIMATE,32(23),8355-8372. |
MLA | Varuolo-Clarke, Arianna M.,et al."Characterizing the North American Monsoon in the Community Atmosphere Model: Sensitivity to Resolution and Topography".JOURNAL OF CLIMATE 32.23(2019):8355-8372. |
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