气候变化领域集成服务门户(CCPortal): A climatology of atmospheric rivers in New Zealand

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DOI	10.1175/JCLI-D-20-0664.1
	A climatology of atmospheric rivers in New Zealand
	Prince H.D.; Cullen N.J.; Gibson P.B.; Conway J.; Kingston D.G.
发表日期	2021
ISSN	08948755
起始页码	4383
结束页码	4402
卷号	34 期号:11
英文摘要	The occurrence of extreme precipitation events in New Zealand regularly results in devastating impacts to the local society and environment. An automated atmospheric river (AR) detection technique (ARDT) is applied to construct a climatology (1979–2019) of extreme midlatitude moisture fluxes conducive to extreme precipitation. A distinct seasonality exists in AR occurrence aligning with seasonal variations in the midlatitude jet streams. The formation of the Southern Hemisphere winter split jet enables AR occurrence to persist through all seasons in northern regions of New Zealand, while southern regions of the country exhibit a substantial (50%) reduction in AR occurrence as the polar jet shifts southward during the cold season. ARs making landfall on the western coast of New Zealand (90% of all events) are characterized by a dominant northwesterly moisture flux associated with a distinct dipole pressure anomaly, with low pressure to the southwest and high pressure to the northeast of New Zealand. Precipitation totals during AR events increase with AR rank (five-point scale) throughout the country, with the most substantial increase on the windward side of the Southern Alps (South Island). The largest events (rank 5 ARs) produce 3-day precipitation totals exceeding 1000 mm. ARs account for up to 78% of total precipitation and up to 94% of extreme precipitation on the west coast of the South Island. Assessment of the multiscale atmospheric processes associated with AR events governing extreme precipitation in the Southern Alps of New Zealand should remain a priority given their hydrological significance and impact on people and infrastructure. © 2021 American Meteorological Society.
英文关键词	Atmosphere; Atmospheric river; Climatology; Extreme events; Flood events; Fluxes; Mass fluxes/transport; Orographic effects; Precipitation; Ranking methods; Seasonal variability; South Pacific Ocean; Water vapor
语种	英语
scopus关键词	Climatology; Moisture; Atmospheric process; Extreme precipitation; Extreme precipitation events; Northern regions; Pressure anomaly; Seasonal variation; Southern Hemisphere; Total precipitation; Precipitation (meteorology)
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/178538
作者单位	School of Geography, University of Otago, Dunedin, New Zealand; Center for Western Weather and Water Extremes, Scripps Institution of Oceanography, University of California, San Diego, CA, United States; National Institute of Water and Atmospheric Research, Christchurch, New Zealand
推荐引用方式 GB/T 7714	Prince H.D.,Cullen N.J.,Gibson P.B.,et al. A climatology of atmospheric rivers in New Zealand[J],2021,34(11).
APA	Prince H.D.,Cullen N.J.,Gibson P.B.,Conway J.,&Kingston D.G..(2021).A climatology of atmospheric rivers in New Zealand.Journal of Climate,34(11).
MLA	Prince H.D.,et al."A climatology of atmospheric rivers in New Zealand".Journal of Climate 34.11(2021).