The New Zealand Climate Coalition had long solicited data from New Zealand’s National Institute of Water & Atmospheric Research (NIWA), which is responsible for New Zealand’s National Climate Database. For years the data was not released, despite many requests to NIWA’s Dr. Jim Salinger — who came from CRU. With Dr. Salingers’ departure from NIWA, the data was released and showed quite a different story than the manipulated data. The raw data showed a warming of just 0.06C per century since records started in 1850. This compared to a warming of 0.92C per century in NIWA’s (CRU’s) adjusted data.This is the story around the world. Insider's blocked attempts by independent scientists to get at the data, and when the data is finally released, it is found to be fraudulent.
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In this story, see how Central Park data was manipulated in inconsistent ways. The original U.S. Historical Climate Network (USHCN) data showed a cooling to adjust for urban heat island effect — but the global version of Central Park (NOAA GHCN again) inexplicably warmed Central Park by 4F. The difference between the two U.S. adjusted and global adjusted databases, both produced by NOAA NCDC, reached an unbelievable 11F for Julys and 7F annually! Gradually and without notice, NOAA began slowly backing off the urban heat island adjustment in the USHCN data in 1999 and eliminated it entirely in 2007.
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Perhaps one of the biggest issues with the global data is station dropout after 1990. Over 6000 stations were active in the mid-1990s. Just over 1000 are in use today. The stations that dropped out were mainly rural and at higher latitudes and altitudes — all cooler stations. This alone should account for part of the assessed warming. China had 100 stations in 1950, over 400 in 1960, then only 25 by 1990. This changing distribution makes any assessment of accurate change impossible.
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Continent after continent, researchers are seeing no warming in the unprocessed data (see one thorough analysis here).
Just as the Medieval Warm Period made it difficult to explain why the last century of warming could not be natural (which the hockey stick team attempted to make go away), so did the warm spike in the 1930s and 1940s. In each of the databases, the land data from that period was adjusted down. And Wigley suggested that sea surface temperatures could likewise be “corrected” down by 0.15C, making the results look both warmer but still plausible.
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When you hear press releases from NOAA, NASA, or Hadley claiming a month, year, or decade ranks among the warmest ever recorded, keep in mind: they have tortured the data, and it has confessed.
Go read the posting for lots more gory details of manipulation and deception by fanatics who want to sell their doomsday scenario to the world.
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