气候变化领域集成服务门户(CCPortal): Tropical climate variability in the Community Earth System Model: Data Assimilation Research Testbed

CCPortal

DOI	10.1007/s00382-019-05030-6
	Tropical climate variability in the Community Earth System Model: Data Assimilation Research Testbed
	Eliashiv J.; Subramanian A.C.; Miller A.J.
发表日期	2020
ISSN	0930-7575
起始页码	793
结束页码	806
卷号	54 期号:2020-01-02
英文摘要	A new prototype coupled ocean–atmosphere Ensemble Kalman Filter reanalysis product, the Community Earth System Model using the Data Assimilation Research Testbed (CESM-DART), is studied by comparing its tropical climate variability to other reanalysis products, available observations, and a free-running version of the model. The results reveal that CESM-DART produces fields that are comparable in overall performance with those of four other uncoupled and coupled reanalyses. The clearest signature of differences in CESM-DART is in the analysis of the Madden–Julian Oscillation (MJO) and other tropical atmospheric waves. MJO energy is enhanced over the free-running CESM as well as compared to the other products, suggesting the importance of the surface flux coupling at the ocean–atmosphere interface in organizing convective activity. In addition, high-frequency Kelvin waves in CESM-DART are reduced in amplitude compared to the free-running CESM run and the other products, again supportive of the oceanic coupling playing a role in this difference. CESM-DART also exhibits a relatively low bias in the mean tropical precipitation field and mean sensible heat flux field. Conclusive evidence of the importance of coupling on data assimilation performance will require additional detailed direct comparisons with identically formulated, uncoupled data assimilation runs. © 2019, The Author(s).
英文关键词	CESM; DART; Data Assimilation; Ensemble Kalman Filter; Madden–Julian Oscillation; Tropical Variability
语种	英语
scopus关键词	atmosphere-ocean system; climate modeling; climate prediction; data assimilation; ensemble forecasting; Kalman filter; Madden-Julian oscillation; research work
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145724
作者单位	Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Physics, University of Oxford, Oxford, United Kingdom
推荐引用方式 GB/T 7714	Eliashiv J.,Subramanian A.C.,Miller A.J.. Tropical climate variability in the Community Earth System Model: Data Assimilation Research Testbed[J],2020,54(2020-01-02).
APA	Eliashiv J.,Subramanian A.C.,&Miller A.J..(2020).Tropical climate variability in the Community Earth System Model: Data Assimilation Research Testbed.Climate Dynamics,54(2020-01-02).
MLA	Eliashiv J.,et al."Tropical climate variability in the Community Earth System Model: Data Assimilation Research Testbed".Climate Dynamics 54.2020-01-02(2020).