气候变化领域集成服务门户(CCPortal): Climatology of severe local storm environments and synoptic-scale features over North America in ERA5 reanalysis and CAM6 simulation

CCPortal

DOI	10.1175/JCLI-D-19-0986.1
	Climatology of severe local storm environments and synoptic-scale features over North America in ERA5 reanalysis and CAM6 simulation
	Li F.; Chavas D.R.; Reed K.A.; Dawson D.T.; II
发表日期	2020
ISSN	0894-8755
起始页码	8339
结束页码	8365
卷号	33 期号:19
英文摘要	Severe local storm (SLS) activity is known to occur within specific thermodynamic and kinematic environments. These environments are commonly associated with key synoptic-scale features-including southerly Great Plains low-level jets, drylines, elevated mixed layers, and extratropical cyclones-that link the large-scale climate to SLS environments. This work analyzes spatiotemporal distributions of both extreme values of SLS environmental parameters and synoptic-scale features in the ERA5 reanalysis and in the Community Atmosphere Model, version 6 (CAM6), historical simulation during 1980-2014 over North America. Compared to radiosondes, ERA5 successfully reproduces SLS environments, with strong spatiotemporal correlations and low biases, especially over the Great Plains. Both ERA5 and CAM6 reproduce the climatology of SLS environments over the central United States as well as its strong seasonal and diurnal cycles. ERA5 and CAM6 also reproduce the climatological occurrence of the synoptic-scale features, with the distribution pattern similar to that of SLS environments. Compared to ERA5, CAM6 exhibits a high bias in convective available potential energy over the eastern United States primarily due to a high bias in surface moisture and, to a lesser extent, storm-relative helicity due to enhanced low-level winds. Composite analysis indicates consistent synoptic anomaly patterns favorable for significant SLS environments over much of the eastern half of the United States in both ERA5 and CAM6, though the pattern differs for the southeastern United States. Overall, our results indicate that both ERA5 and CAM6 are capable of reproducing SLS environments as well as the synoptic-scale features and transient events that generate them. © 2020 American Meteorological Society.
英文关键词	Climatology; Potential energy; Community atmosphere model; Convective available potential energies; Environmental parameter; Extratropical cyclones; Historical simulation; Kinematic environments; Spatiotemporal correlation; Spatiotemporal distributions; Storms; atmospheric modeling; climatology; computer simulation; extratropical cyclone; spatiotemporal analysis; synoptic meteorology; thermodynamics; wind velocity; Great Plains; United States
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171103
作者单位	Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, United States; School of Marine and Atmospheric Sciences, Stony Brook University, State University of New York, Stony Brook, NY, United States
推荐引用方式 GB/T 7714	Li F.,Chavas D.R.,Reed K.A.,et al. Climatology of severe local storm environments and synoptic-scale features over North America in ERA5 reanalysis and CAM6 simulation[J],2020,33(19).
APA	Li F.,Chavas D.R.,Reed K.A.,Dawson D.T.,&II.(2020).Climatology of severe local storm environments and synoptic-scale features over North America in ERA5 reanalysis and CAM6 simulation.Journal of Climate,33(19).
MLA	Li F.,et al."Climatology of severe local storm environments and synoptic-scale features over North America in ERA5 reanalysis and CAM6 simulation".Journal of Climate 33.19(2020).