气候变化领域集成服务门户(CCPortal): A new detection scheme of wave-breaking events with blocking flow configurations

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DOI	10.1175/JCLI-D-20-0037.1
	A new detection scheme of wave-breaking events with blocking flow configurations
	Shi N.; Nakamura H.
发表日期	2021
ISSN	08948755
起始页码	1467
结束页码	1483
卷号	34 期号:4
英文摘要	Blocking flow configurations, which tend to accompany strong circulation anomalies and therefore can cause extreme weather conditions, have recently been studied in relation to large-scale wave breaking (WB). Although WB events have been detected often from an instantaneous morphology perspective, the present study proposes a new approach for the detection from a wave-activity perspective in focusing on its accumulation, saturation, and release. This evolution of wave activity is theoretically equivalent to anomalous potential vorticity (PV) flux with its sign changing from negative to positive, which is utilized in this study to detect WB events that accompany high-amplitude height anomalies and blocking flow configurations. As in previous studies, a given WB event is classified into a high pressure type or low pressure type depending upon the sign of the primary PV anomaly center and further into an eastward or westward type depending upon the longitudinal movement of that center. The new method applied to the wintertime Northern Hemisphere shows that a WB event with a blocking anticyclone is likely to accompany an eastward-moving PV anomaly center, occurring mostly under anticyclonic westerly shear. By contrast, a WB event with a strong cyclonic anomaly mostly accompanies the eastward-moving PV anomaly center under cyclonic westerly shear. Composite analysis confirms the consistency between the sign-changing anomalous PV flux and convergence/divergence of wave-activity flux of quasi-stationary Rossby wave trains around the WB region. Ó 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy
英文关键词	Blocking; Rossby waves; Synoptic climatology; Wave breaking
语种	英语
scopus关键词	Liquid waves; Meteorology; Oceanography; American meteorological societies; Circulation anomalies; Convergence/divergence; Copyright informations; Extreme weather conditions; Longitudinal movements; Northern Hemispheres; Potential vorticity; Fluxes; anticyclone; atmospheric blocking; potential vorticity; Rossby wave; synoptic meteorology; wave breaking; westerly
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/178629
作者单位	Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing, China; Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan
推荐引用方式 GB/T 7714	Shi N.,Nakamura H.. A new detection scheme of wave-breaking events with blocking flow configurations[J],2021,34(4).
APA	Shi N.,&Nakamura H..(2021).A new detection scheme of wave-breaking events with blocking flow configurations.Journal of Climate,34(4).
MLA	Shi N.,et al."A new detection scheme of wave-breaking events with blocking flow configurations".Journal of Climate 34.4(2021).