气候变化领域集成服务门户(CCPortal): Half-century perspectives on North American spring snowline and snow cover associations with the Pacific?North American teleconnection pattern

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DOI	10.3354/cr01499
	Half-century perspectives on North American spring snowline and snow cover associations with the Pacific?North American teleconnection pattern
	Ballinger T.J.; Rohli R.V.; Allen M.J.; Robinson D.A.; Estilow T.W.
发表日期	2018
ISSN	0936-577X
起始页码	201
结束页码	216
卷号	74 期号:3
英文摘要	Spring (MAM) snow coverage across North America (NA) has significantly declined during the last half-century (1967?2016), with possible linkages to changing behaviors in large-scale atmospheric circulation. In this study, we investigated relationships between intraseasonal, sub-continental NA snow cover characteristics and the Pacific?North American (PNA) teleconnection pattern, which quantifies longwave, ridge?trough fluctuations in the 500 hPa geopotential height (GPH) field over the Northern Hemisphere. Correlation and composite techniques were applied to analyze NA spring and intra-spring snow cover extent (SCE) and snowline (SL) associations with PNA index variations. Results show the PNA pattern to be significantly correlated to interannual SL and SCE during April and climatological spring, particularly over western NA. Anomalous PNA values (i.e. exceeding ±1 SD from the index mean) particularly influence transient snow in early/mid-spring. Composites of 500 hPa GPH and low-level air temperature fields suggest that both positive and negative March PNA index anomalies are linked with expansion of western and NA-wide snow cover, while positive (negative) April PNA anomalies yield retreat (advance) to varying magnitudes across sub-continental NA. Seasonal persistence of the PNA pattern is also an important factor in determining regional snow conditions, as negative PNA values in March?April favors above-normal total spring snow coverage, while positive PNA values in these months evoke a slight retreat (advance) that is dependent on negative (positive) phase persistence through May. This study provides additional insight into mid-tropospheric circulation connections to NA springtime snow cover during an era of rapid climate and environmental change. © Inter-Research 2018
英文关键词	North America; Pacific–North American teleconnection pattern; Snow cover extent; Snowline
语种	英语
来源期刊	Climate Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146982
作者单位	Department of Geography, Texas State University, San Marcos, TX 78666, United States; Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, LA 70803, United States; Department of Political Science and Geography, Old Dominion University, Norfolk, VA 23529, United States; Department of Geography, Rutgers, State University of New Jersey, Piscataway, NJ 08854, United States
推荐引用方式 GB/T 7714	Ballinger T.J.,Rohli R.V.,Allen M.J.,et al. Half-century perspectives on North American spring snowline and snow cover associations with the Pacific?North American teleconnection pattern[J],2018,74(3).
APA	Ballinger T.J.,Rohli R.V.,Allen M.J.,Robinson D.A.,&Estilow T.W..(2018).Half-century perspectives on North American spring snowline and snow cover associations with the Pacific?North American teleconnection pattern.Climate Research,74(3).
MLA	Ballinger T.J.,et al."Half-century perspectives on North American spring snowline and snow cover associations with the Pacific?North American teleconnection pattern".Climate Research 74.3(2018).