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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Brumar89 who wrote (833403)	1/30/2015 11:53:02 AM
From: Wharf Rat	Read Replies (2) \| Respond to of 1578303

HCN's own unadjusted data show that 2014 was cool year." I see your problem. It's called "Willful ignorance writ large in stone". It can be cured by taking Climate Science 10; Bonehead Climate Science. Pay special attention to the part that demonstrates that recording devices aren't set in stone. Only the names of the organizations and localities have been changed to protect the innocent. Why climate data sometimes need to be adjusted How do climate scientists identify a real temperature trend? For example, what happens if some temperature measurements were made on top of a hill and other measurements were at sea level? Measuring sites have been moved over time NIWA’s “seven-station” temperature series is a composite record put together from more than 30 individual measuring sites in the seven locations: Auckland, Masterton, Wellington, Nelson, Hokitika, Christchurch, and Dunedin. Measurement sites at each location have been moved around over time, and individual measuring sites have operated for varying lengths of time, but, collectively, these measurements extend back at least to the early 1900s, and form a valuable historical record of New Zealand temperatures. To calculate a trend over such a long period, it is necessary to merge the raw temperature data from different sites. Some measuring sites are colder or warmer than others Sometimes there are climatic differences between the sites which mean that if temperature measurements were taken at both sites over the same period of time, the reading would be consistently different. Reasons why one site might be intrinsically warmer or colder than another include: altitude: a higher site is generally colder than a lower site (eg in Wellington, the measuring site at Kelburn is about 120 metres higher than the one at Thorndon) exposure to the elements: a more wind-swept site is generally colder than a more protected site If you join raw data from different sites together, and plot a graph, you might see a “step jump” (fig 1), or discontinuity, when a site change occurs. That step jump has to be removed before calculating the trend or you would mix a change in temperature over time with a change between sites. You would not be able to tell whether the location had genuinely warmed or cooled because your result would be confused by the effect of shifting the measuring site. Original raw data are kept secure When we create a time series using adjusted data, we retain all the original raw data. It remains available on-line in the NIWA climate database so others can conduct their own analysis. CliFlo - the NIWA climate database (fig1) If you join raw data from different sites together, and plot a graph, you might see a “step jump”, or discontinuity, when a site change occurs. niwa.co.nz