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Post by visitor on Jan 2, 2011 15:10:51 GMT
This is interesting hot-topic.co.nz/niwas-new-nz-temperature-series-plus-ca-change/"Earlier this afternoon NIWA released its recalculated NZ temperature record, and as expected the changes from the “old” seven station series are more or less negligible. The trend over the last 100 years is identical, 0.91ºC per century" |
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Post by marchesarosa on Jan 8, 2011 12:05:50 GMT
"The trend over the last 100 years is identical, 0.91ºC per century", claims our visitor. Would that be before or after "adjustment", visitor? Just a reminder of the effect of NIWA's "adjustments"!  Why would climatologists want to reduce the temperature of the past? Does visitor have an answer? |
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Post by marchesarosa on Oct 30, 2014 14:28:49 GMT
At long last the controversy over the disputed NZ temperature record has been addressed in the peer reviewed literature. this will set the cat amongst the alarmist pigeons! New paper finds no significant 20th century warming for NZOCTOBER 30, 2014 A Reanalysis of Long-Term Surface Air Temperature Trends in New Zealand * by C.R. de Freitas, M.O. Dedekind and B.E. Brill. Environomental Modeling and Assessment 2014dl.dropboxusercontent.com/u/75831381/de%20Freitas%20NZ%20temp.pdf A research paper on the homogenisation of the temperature record in New Zealand, reducing the current official rate of 0.9°C per century to 0.3°C, has just been published in the international scientific journal Environmental Modeling & Assessment. The paper addresses the values of the data adjustments required during 100 years of the Seven-station Series, which is recognised as being representative of New Zealand as a whole. It also considers corrections to station data contaminated by vegetation growth, urbanisation and other factors. The New Zealand historical temperature trend has not been addressed in the scientific literature since the first Seven Station Series was published by MJ Salinger in 1980. At about the same time, a paper by JWD Hessell called in question the quality of the New Zealand historical weather data used in the series. The new paper builds on both viewpoints by applying modern techniques to correct sub-optimal raw data and to recalculate the 1980 adjustments. The method used for recalculations was that described in the leading New Zealand paper, Rhoades & Salinger (1993). Lead author Chris de Freitas commented: “Regional and national temperature trends are widely used for a large number of societal design and planning purposes and it is important that they should be as reliable as modern methods allow”. He added “New Zealand provides one of the longest continuous climate series in the Pacific Ocean as well as one of the longest in the Southern Hemisphere. This means our trends are of ongoing interest to a wide audience of scientists.” The paper finds that New Zealand warmed over the 20th century at the rate of 0.3°C per century, which allowing for accepted margins of error means that there has been no significant warming. Abstract Detecting trends in climate is important in assessments of global change based on regional long-term data. Equally important is the reliability of the results that are widely used as a major input for a large number of societal design and planning purposes. New Zealand provides a rare long temperature time series in the Southern Hemisphere, and it is one of the longest continuous climate series available in the Southern Hemisphere Pacific. It is therefore important that this temperature dataset meets the highest quality control standards. New Zealand’s national record for the period 1909 to 2009 is analysed and the data homogenized. Current New Zealand century-long climatology based on 1981 methods produces a trend of 0.91 °C per century. Our analysis, which uses updated measurement techniques and corrects for shelter-contaminated data, produces a trend of 0.28 °C per century. www.scoop.co.nz/stories/SC1410/S00086/new-paper-finds-no-significant-20th-century-warming-for-nz.htm |
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