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Home / New Zealand

2018 NZ's hottest year on record - climate scientist

Jamie Morton
By Jamie Morton
Multimedia Journalist·NZ Herald·
2 Jan, 2019 05:00 PM3 mins to read

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Beachgoers ride the surf at Mt Maunganui in February 2018 after last year began with the hottest summer on record. Photo / File

Beachgoers ride the surf at Mt Maunganui in February 2018 after last year began with the hottest summer on record. Photo / File

A veteran climate scientist has called 2018 our hottest year on record.

Niwa isn't due to release its official summary for the year until early next week, but Professor Jim Salinger has already picked it the warmest on records stretching back to 1867.

His calculations put 2018's mean annual land surface temperatures at 13.5C – or 0.85C above the 1981-2010 average.

His figure also surpassed the scorching years of 1998 and 2016, which were 0.80C and 0.84C above normal respectively.

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Niwa meteorologist Chris Brandolino said people would have to wait until next week to see the climate agency's final numbers – but added Niwa's preliminary figures showed 2018 tracking extremely close to 2016's record.

Last year got off to an unusually warm start with the hottest summer - and the hottest recorded month ever, January - on the books.

"January, March, July and December were all at least 1C above normal, with January being massive 3.2C above average - the hottest month ever," Salinger said.

The record warmth of 2018 was accompanied by warm seas around the country.

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"For all months of the year sea surface temperatures around New Zealand were well above average, with preliminary estimates for 2018 being 0.8C above average."

Even as 2018 began, it was in the grip of a marine heatwave caused by a freak combination of factors and which turned the Tasman Sea into a warm bath, fired the record summer, and lured swarms of jellyfish to our shores.

"The heat of 2018 was also demonstrated by the record loss of ice on the Southern Alps," he said.

"We measured a nine per cent drop in just one year. That says it all. We've never had anything like that in the glacier record."

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The New Zealand extended temperature record, 1867 - 2018, compared with the 1981 - 2010 normal. Bars represent individual years, the orange line smoothed trends, and dotted red line the overall trend. Source / Professor Jim Salinger
The New Zealand extended temperature record, 1867 - 2018, compared with the 1981 - 2010 normal. Bars represent individual years, the orange line smoothed trends, and dotted red line the overall trend. Source / Professor Jim Salinger

Globally, 2018 was likely to be the fourth-warmest year ever recorded, with an average temperature sitting 0.6C above the 1970-2000 baseline, and only behind the years 2015, 2016 and 2017.

"And more heating is predicted for 2019, by the UK Met Office," Salinger said.

"Their 2019 forecast indicates that the year 2019 will be close to a record due to global heating and the added effect of the El Niño in the tropical Pacific."

Salinger said that with six of our warmest years falling in the last two decades, the hand of climate change was unequivocal.

New Zealand's average temperature had grown 1.3C warmer over 151 years of records.

"It's roaring away," he said.

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January, March, July and December were all at least 1C above normal, with January being 3.2C above average. Source / Professor Jim Salinger
January, March, July and December were all at least 1C above normal, with January being 3.2C above average. Source / Professor Jim Salinger

He highlighted the UN's recent report warning that the world had little over a decade to limit global warming to 1.5C above pre-industrial levels – and only around two decades to hold the Paris Agreement's symbolic 2C line.

"We have to get going now and make significant inroads in the next years – there's now a global movement of youth calling for that."

Niwa's latest seasonal outlook, covering summer, predicted temperatures were equally likely to be near or above average until the end of February, with near-normal rainfall likely for most regions.

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