Video | Business Headlines | Internet | Science | Scientific Ethics | Technology | Search

 


NIWA PR Regarding NZ Climate Science Claims

Clarification of NZ Climate Science Coalition claims re NZ temperature trends

The New Zealand Climate Science Coalition yesterday issued a media release claiming that a UK-based research group has calculated a much higher temperature trend for New Zealand over the period 1979 to 2005 than shown by NIWA data. The coalition claims that the Intergovernmental Panel on Climate Change (IPCC) "believes" this higher figure, and that this alleged disagreement amongst experts shows that the science of climate change is "far from settled".

The coalition is not comparing apples with apples.

DETAILS OF THE UK DATASETS

The UK research group referred to by the coalition is the Climatic Research Unit of the University of East Anglia, Norwich, which is led by Dr Phil Jones (the "Jones et al" data).

Jones et al provide several large, complex datasets. These data are averages over squares of 5 degrees latitude by 5 degrees longitude over the globe (so there are only a handful of squares which relate to New Zealand).

There are two key datasets: 1. Land-based data only. The NIWA temperature trends are from land-based climate station measurements, so this land-based dataset is the appropriate one for comparison purposes. The trend from the Jones et al land-based data and from NIWA's land temperature data are in close agreement. The 1979–2005 trend from the NIWA data is 0.25 degrees Celsius. The trend which NIWA scientists have calculated from the Jones et al land-based data is 0.21 degrees Celsius.

2. Synthesised land-based and sea surface temperature data. This appears to be the dataset which the coalition has used, and it includes more ocean area than land area for the New Zealand grid squares. For the period the coalition has chosen (1979–2005), the ocean data shows greater warming than the land data. Using this dataset, we calculate the trend as about 0.6 degrees. This is how the coalition gets a much higher temperature trend.

The ocean temperature is affected by a combination of local conditions and transport of heat from other places. This means that we do not expect the land and ocean temperatures to show the same trends over a period of only a couple of decades.

ACCESS TO NIWA DATA

In their media release, the coalition asks the Minister responsible for climate change issues to "direct NIWA to release its (climate) station data". Warwick Hughes of the coalition already has NIWA's corrected data for each individual station in the New Zealand temperature time series, which we provided to him at no cost. For raw climate data, NIWA charges the marginal cost of supply. We also charge for a value-added service of provision of climate data via the internet. Mr Hughes has been offered access to these services subject to our standard rates, terms, and conditions.

ENDS


© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Budget Building Battle: Bill English Blames Council On Housing

The Nation: Finance Minister blames Auckland Council for housing shortage, saying it is responsible for land, housing and infrastructure supply in the city, while government provides rental subsidies... More>>

ALSO:

Megiaglommeration: NZME And Fairfax Apply For Authorisation To Merge

The Commerce Commission has received an application from Wilson and Horton Limited (trading as NZME) and Fairfax NZ Limited seeking authorisation to merge their media operations in New Zealand. More>>

ALSO:

Brewing: Lion To Buy Cult Upper Hutt Brewer Panhead

Lion - Beer, Spirits and Wine (NZ), New Zealand's biggest beer maker, has agreed to buy Panhead Custom Ales from the family of founder Mike Neilson, its second such purchase of a popular craft brewer after the acquisition of Dunedin-based Emerson's Brewing Co in 2012. More>>

ALSO:

Half Empty: Fonterra's 2017 Opening Forecast Below Expectations

Fonterra Cooperative Group raised its forecast farmgate milk payout for next season by less than expected as the world's largest dairy exporter predicts lower prices will crimp production and supply will pick up. The New Zealand dollar fell. More>>

ALSO:

Pest Control: Mouse Blitz Team Leaves For Antipodes

The Million Dollar Mouse project to rid Antipodes Island of mice is underway with the departure of a rodent eradication team to the remote nature reserve and World Heritage Area. More>>

Get More From Scoop

 
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news