气候变化领域集成服务门户(CCPortal): A Reliability Budget Analysis of CESM-DART

CCPortal

DOI	10.1029/2019MS001678
	A Reliability Budget Analysis of CESM-DART
	Eliashiv J.; Subramanian A.C.; Miller A.J.
发表日期	2020
ISSN	19422466
卷号	12 期号:2
英文摘要	A reliability budget is used to diagnose potential sources of error (departure from observations) in a new prototype coupled ocean-atmosphere ensemble Kalman filter reanalysis product, the Community Earth System Model using the Data Assimilation Research Testbed (CESM-DART). In areas with sufficient observations, the mean bias in zonal wind was generally very low compared to the spread due to ensemble variance, which did not exhibit patterns associated with Northern Hemisphere jet streams but did have regional enhancement over the Maritime Continent. However, the residual term was often the largest contributor to the budget, which is problematic, suggesting improper observational error statistics and inadequately represented ensemble variance statistics. The departure and residual exhibit significant seasonal variability, with a strong peak in boreal winter months, indicating the model's deficiencies during the energetic Northern Hemisphere winter. Ocean temperature contained large error in areas with eddy production indicating inadequate ensemble variance due to poor model resolution. Periods when the Madden-Julian Oscillation (MJO) was active exhibited lower error, especially in the western equatorial Pacific during MJO phases with reduced convection. In contrast, during MJO phases with enhanced convection in that region, the ensemble variance is increased yet the error is comparable to non-MJO conditions, suggesting a controlling effect of the precipitation parameterization. Further studies evaluating the impact of the coupled assimilation procedure on the reliability budget will be illuminating. ©2019. The Authors.
英文关键词	CESM; ensemble Kalman filter; Madden-Julian Oscillation; reliability budget
语种	英语
scopus关键词	Climatology; Earth atmosphere; Error statistics; Errors; Kalman filters; Reliability analysis; Assimilation procedure; CESM; Enhanced convection; Ensemble Kalman Filter; Madden-Julian oscillation; Northern Hemispheres; Observational errors; Seasonal variability; Budget control; air-sea interaction; atmosphere-ocean coupling; Kalman filter; Madden-Julian oscillation; Northern Hemisphere; precipitation (climatology); temperature effect; zonal wind; Pacific Ocean; Pacific Ocean (Equatorial)
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156766
作者单位	Scripps Institution of Oceanography ClimaCell, Boulder, CO, United States; Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO, United States
推荐引用方式 GB/T 7714	Eliashiv J.,Subramanian A.C.,Miller A.J.. A Reliability Budget Analysis of CESM-DART[J],2020,12(2).
APA	Eliashiv J.,Subramanian A.C.,&Miller A.J..(2020).A Reliability Budget Analysis of CESM-DART.Journal of Advances in Modeling Earth Systems,12(2).
MLA	Eliashiv J.,et al."A Reliability Budget Analysis of CESM-DART".Journal of Advances in Modeling Earth Systems 12.2(2020).