It’s six years since NIWA published their Report on the Review of NIWA’s ‘Seven-Station’ Temperature Series (pdf, 8.5 MB), the latest version of the national temperature record. It’s six years, too, since NIWA promised the people of New Zealand (in Parliament) they would publish the methodology in that report in a peer-reviewed journal. But they haven’t done so—maybe they aren’t too pleased with it.
Last year, three scientists associated with the NZ Climate Science Coalition published a peer-reviewed paper concluding the New Zealand temperature rise over the last hundred years was only 0.28°C, much lower than the last NIWA effort, which claimed it was 0.91°C. Though I notice just now when checking the NIWA website they’re claiming 0.92°C.
Kenneth Richard has just posted an article on the de Freitas et al. paper at NoTricksZone – h/t Maggy Wassilieff. He describes the paper thus:
According to scientists de Freitas, Dedekind, and Brill (2015), removing “contaminated data” from New Zealand’s nation-wide temperature record — and using updated measurement techniques rather than error-ridden outdated ones — reduces the long-term (1909 to 2009) New Zealand warming trend from today’s +0.91°C to +0.28°C, a 325% change.
NIWA still have made no reply to the de Freitas et al. paper. I’m sure they would have if they had disagreed with it; they obviously recognise its value.
If NIWA haven’t published their own methodology they can scarcely claim their method superior, as they did during the application for judicial review in 2012. It also means they cannot reasonably argue with the amount of long-term warming in New Zealand — 0.28°C. Regardless of the global warming hypothesis, science shows there’s been no significant warming in New Zealand.
Mr Richard concludes by putting the de Freitas et al. paper in a stunning global context:
A few days ago, a compilation of over 50 temperature graphs from peer-reviewed scientific papers revealed that large regions of the Earth have not been warming in recent decades, and that modern temperatures are still some of the coldest of the last 10,000 years. Apparently the nation of New Zealand can now be added to this list as a region where no significant changes in temperature have taken place within the last 150 years.