Climate Conversation Group

Shakespeare mastered the arts both of comedy and tragedy; occasionally they play simultaneously. Hence the spectacle of NIWA’s slapstick, slapdash, cobbling together of any old temperature series, set against the patient, single-minded, skilled-amateur analysis by members of the Coalition.

It would be easy to overlook this little paper, but don’t be tempted! In the context of “NIWAgate”, our legal move against NIWA and world-wide action to clarify temperature records which seem to bolster claims of unprecedented warming, Barry Brill’s revelations are dynamite! We asked NIWA what changes they made and why. NIWA said we’d find it in certain papers. Now, for the first time, Barry shows decisively that those papers don’t contain either the changes or the reasons they were made. NIWA’s duplicity is indisputable. Is this the behaviour we want from our premier climate research agency?   - Richard Treadgold

– by Barry Brill, Chairman of the New Zealand Climate Science Coalition

The weather station at Lincoln is one of the seven which make up the official NZ Temperature Record over the past 100 years. It shows a strong warming trend as a result of downwards adjustments which NIWA made in respect of the pre-WW2 period. But those adjustments rely upon a curious methodology which is not supported by any of the peer-reviewed literature.

The original temperature data for the Lincoln weather station – recorded by the NZ MetService, and now downloadable from NIWA’s official Climate Database – shows no warming trend over the past 100 years.

More adjustments that cause warming

The Schedule of Adjustments (SoA) prepared by Dr Brett Mullan and posted on the NIWA website on 9 February 2010, shows five downwards adjustments in the period 1881-1943 and two upwards adjustments during 1944-75. All seven alterations to the NZ MetService climate database are trend-favourable, and comprise the sole source of the reported warming trend. Read more… »