气候变化领域集成服务门户(CCPortal): A Feature-Based Approach to Classifying Summertime Potential Vorticity Streamers Linked to Rossby Wave Breaking in the North Atlantic Basin

CCPortal

DOI	10.1175/JCLI-D-19-0812.1
	A Feature-Based Approach to Classifying Summertime Potential Vorticity Streamers Linked to Rossby Wave Breaking in the North Atlantic Basin
	Papin P.P.; Bosart L.F.; Torn R.D.
发表日期	2020
ISSN	0894-8755
起始页码	5953
结束页码	5969
卷号	33 期号:14
英文摘要	This study examines climatological potential vorticity streamer (PVS) activity associated with Rossby wave breaking (RWB), which can impact TC activity in the subtropical North Atlantic (NATL) basin via moisture and wind anomalies. PVSs are identified along the 2-PVU(1 PVU 5 1026Kkg21m2 s21) contour on the 350-K isentropic surface, using a unique identification technique that combines previous methods. In total, 21 149 individual PVS instances are identified from the ERA-Interim (ERAI) climatology during June-November over 1979-2015 with a peak in July-August. The total number of PVSs identified in this study is more than previous PVS climatologies for this region, since the new technique identifies a wider range of cases. Variations in PVS size and intensity prompt the development of a new PVS activity index (PVSI), which provides an integrated measure of PVS activity that can improve comparisons with TC activity. For instance, PVSI has a stronger negative correlation with seasonalTC activity (r520.55) relative to PVS frequency, size, or intensity alone. PVSI in June-July is also positively correlated with PVSI in August-November (r 5 0.67), suggesting predictive capability. Compared to the ERAI and Japan Meteorological Agency 55-Year Reanalysis (JRA-55) climatology, there are more PVSs in the Climate Forecast System Reanalysis (CFSR) but these have weaker average intensity overall. While no long-Term trend in PVSI is observed in the ERAI or JRA-55 climatologies, a negative trend is observed in CFSR, which could be related to differences in near tropopause static stability early in the climatological period (1979-86) between the CFSR and ERAI datasets. © 2020 American Meteorological Society. All rights reserved.
英文关键词	Liquid waves; Oceanography; Vorticity; Climate forecasts; Feature based approaches; Isentropic surfaces; Japan meteorological agencies; Negative correlation; Potential vorticity; Predictive capabilities; Unique identifications; Climatology; atmospheric dynamics; climate modeling; Rossby wave; seasonal variation; vorticity; wave breaking; wind velocity; Atlantic Ocean; Atlantic Ocean (North)
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/171232
作者单位	National Research Council, Monterey, CA, United States; Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY, United States
推荐引用方式 GB/T 7714	Papin P.P.,Bosart L.F.,Torn R.D.. A Feature-Based Approach to Classifying Summertime Potential Vorticity Streamers Linked to Rossby Wave Breaking in the North Atlantic Basin[J],2020,33(14).
APA	Papin P.P.,Bosart L.F.,&Torn R.D..(2020).A Feature-Based Approach to Classifying Summertime Potential Vorticity Streamers Linked to Rossby Wave Breaking in the North Atlantic Basin.Journal of Climate,33(14).
MLA	Papin P.P.,et al."A Feature-Based Approach to Classifying Summertime Potential Vorticity Streamers Linked to Rossby Wave Breaking in the North Atlantic Basin".Journal of Climate 33.14(2020).