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NIWA: Warming through past century unequivocal

NIWA Media Release 26 November 2009

Warming over New Zealand through the past century is unequivocal.

NIWA’s analysis of measured temperatures uses internationally accepted techniques, including making adjustments for changes such as movement of measurement sites. For example, in Wellington, early temperature measurements were made near sea level, but in 1928 the measurement site was moved from Thorndon (3 metres above sea level) to Kelburn (125 m above sea level). The Kelburn site is on average 0.8°C cooler than Thorndon, because of the extra height above sea level.

Such site differences are significant and must be accounted for when analysing long-term changes in temperature. The Climate Science Coalition has not done this.

NIWA climate scientists have previously explained to members of the Coalition why such corrections must be made. NIWA’s Chief Climate Scientist, Dr David Wratt, says he’s very disappointed that the Coalition continue to ignore such advice and therefore to present misleading analyses.

NIWA scientists are committed to providing robust information to help all New Zealanders make good decisions.

See this page for more information about combining data from multiple sites in Wellington [Scoop copy here]

ENDS

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