From the New Zealand Climate Science Coalition comes a paper that in light of Climategate reanalyzes the climate results from New Zealand's National Institute of Water and Atmospheric Research (NIWA).  What exactly did they find?  Almost the same kind of "adjustments" made to temperature measurements that result in a graph with the temperature going up in a straight line.

New Zealand's National Institute of Water & Atmospheric Research (NIWA) is responsible for New Zealand's National Climate Database. This database, available online, holds all New Zealand's climate data, including temperature readings, since the 1850s. Anybody can go and get the data for free. That’s what we did, and we made our own graph.

The official version

Before we see that, let’s look at the official temperature record. This is NIWA’s graph of temperatures covering the last 156 years:

This graph is the centrepiece of NIWA’s temperature claims. It contributes to global temperature statistics and the IPCC reports. It is partly why our government is insisting on introducing an ETS scheme and participating in the climate conference in Copenhagen. But it’s an illusion.

So what were the ACTUAL temperature readings?

To get the original New Zealand temperature readings, you register on NIWA's web site, download what you want and make your own graph. We did that, but the result looked nothing like the official graph. Instead, we were surprised to get this:

Straight away you can see there’s no slope—either up or down. The temperatures are remarkably constant way back to the 1850s. Of course, the temperature still varies from year to year, but the trend stays level—statistically insignificant at 0.06°C per century since 1850.  Putting these two graphs side by side, you can see huge differences. What is going on? Why does NIWA’s graph show strong warming, but graphing their own raw data looks completely different? Their graph shows warming, but the actual temperature readings show none whatsoever!

Have the readings in the official NIWA graph been adjusted?

It is relatively easy to find out. We compared raw data for each station (from NIWA’s web site) with the adjusted official data, which we obtained from one of Dr Salinger’s colleagues. Requests for this information from Dr Salinger himself over the years, by different scientists, have long gone unanswered, but now we might discover the truth.

The shocking truth is that the oldest readings have been cranked way down and later readings artificially lifted to give a false impression of warming, as documented below. There is nothing in the station histories to warrant these adjustments and to date Dr Salinger and NIWA have not revealed why they did this.

There isn't much more to add here.  It's time to give the other side a chance to respond to these claims against their work.  It also looks like the weather down in New Zealand isn't warming up as much as some people thought, except for maybe in a certain laboratory!