A Climatology of Atmospheric Rivers in New Zealand
Authors:Prince, Hamish D.Cullen, Nicolas J.Gibson, Peter B.Conway, JonoKingston, Daniel G.
Source:JOURNAL OF CLIMATE
Volume:34
Published:2021
Document Type:Article
Abstract: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.
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Reprint Address:Prince, HD (corresponding author), Univ Otago, Sch Geog, Dunedin, New Zealand.; Prince, HD (corresponding author), Univ Calif San Diego, Scripps Inst Oceanog, Ctr Western Weather & Water Extremes, La Jolla, CA 92093 USA.
Addresses:[Prince, Hamish D.; Cullen, Nicolas J.; Kingston, Daniel G.] Univ Otago, Sch Geog, Dunedin, New Zealand. [Prince, Hamish D.; Gibson, Peter B.] Univ Calif San Diego, Scripps Inst Oceanog, Ctr Western Weather & Water Extremes, La Jolla, CA 92093 USA. [Conway, Jono] Natl Inst Water & Atmospher Res, Christchurch, New Zealand.
E-mail Addresses:prince.hamishd@gmail.com