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Coastal sea temperatures around New Zealand well above average
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IANS | 30 Nov, 2021
Coastal sea temperatures around New Zealand have risen well above
average recently, a National Institute of Water and Atmospheric Research
(NIWA) meteorologist said on Tuesday.
Meteorologist Ben Noll
said that water temperatures have ranged from 1.1-1.4 degrees Celsius
above average for November, with daily sea surface temperatures more
than 3 degrees Celsius above average around the western and northern
North Island and eastern South Island over the last week.
Marine
heatwave conditions, classified when the sea temperature is above the
90th percentile for at least five days, have been observed in waters
offshore of all regions of New Zealand.
This is comparable to the
conditions observed in November 2017, which marked the beginning of an
unprecedented marine heatwave around the country and in the Tasman Sea,
Xinhua news agency reported.
"Frequent patterns of high pressure
near and south of New Zealand during November, owing to La Nina, have
caused more frequent sub-tropical, northeasterly winds than normal.
Reduced wind speeds through the month have prevented colder, subsurface
ocean waters from getting mixed up to the surface. In addition, sunshine
has generally been above normal, which has helped to heat the ocean
surface," Noll said.
Marine heatwaves are becoming increasingly
frequent in a warmer climate with 963 marine heatwave days observed in
the New Zealand region between 2010-2019 compared with 366 between
2000-2009.
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