-Caveat Lector-
In my field we use other indicators as to climate temps over time. One
of the more important being records of ice in various parts of the world.
From all I have seen there is a general warming pattern for the past
14,000 years. Jayson
On Sat, 13 Jan 2001 21:31:42 EST DIG alfred webre <[EMAIL PROTECTED]>
writes:
>-Caveat Lector-
>
>Are there any comments or retorts to this controversial report?
>======
>LONDON TELEGRAPH Jan. 14, 2001
>Global warming claims 'based on false data'
>By Robert Matthews
>
>FRESH doubt has been cast on evidence for global warming following the
>discovery that a key method of measuring temperature change has
>exaggerated
>the warming rate by almost 40 per cent.
>
>Studies of temperature records dating back more than a century have
>seemed to
>indicate a rise in global temperature of around 0.5 � C, with much of
>it
>occurring since the late 1970s. This has led many scientists to
>believe that
>global warming is under way, with the finger of blame usually pointed
>at
>man-made pollution such as carbon dioxide.
>
>Now an international team of scientists, including researchers from
>the Met
>Office in Bracknell, Berkshire, has found serious discrepancies in
>these
>temperature measurements, suggesting that the amount of global warming
>is
>much less than previously believed.
>
>The concern focuses on the temperature of the atmosphere over the sea,
>which
>covers almost three quarters of the Earth's surface. While scientists
>use
>standard weather station instruments to detect warming on land, they
>have
>been forced to rely on the crews of ships to make measurements over
>the vast
>ocean regions.
>
>Crews have taken the temperature by dipping buckets into the sea or
>using
>water flowing into the engine intakes. Scientists have assumed that
>there is
>a simple link between the temperature of seawater and that of the air
>above
>it.
>
>However, after analysing years of data from scientific buoys in the
>Pacific
>that measure sea and air temperatures simultaneously, the team has
>found no
>evidence of a simple link. Instead, the seawater measurements have
>exaggerated the amount of global warming over the seas, with the real
>temperature having risen less than half as fast during the 1970s than
>the
>standard measurements suggest.
>
>Reporting their findings in the influential journal Geophysical
>Research
>Letters, the scientists say that the exact cause of the discrepancy is
>not
>known. One possibility is that the atmosphere responded faster than
>the sea
>to cooling events such as volcanic eruptions.
>
>The findings have major implications for the climate change debate
>because
>the sea temperature measurements are a key part of global warming
>calculations. According to the team, replacing the standard seawater
>data
>with the appropriate air data produces a big cut in the overall global
>warming rate during the last 20 years, from around 0.18�C per decade
>to
>0.13�C.
>
>This suggests that the widely-quoted global warming figure used to
>persuade
>governments to take action over greenhouse gases exaggerates the true
>warming
>rate by almost 40 per cent. The team is now calling for climate
>experts to
>switch from seawater data to sea-air temperature measurements.
>
>One member of the team, David Parker, of the Hadley Centre for Climate
>Prediction and Research at the Met Office, said that the discovery of
>the
>discrepancy "shows we don't understand everything, and that we need
>better
>observations - all branches of science are like that". Yet according
>to Mr
>Parker, the new results do not undermine the case for global warming:
>"It is
>raising questions about the interpretation of the sea-surface data."
>
>Even so, the findings will be seized on by sceptics as more evidence
>that
>scientists have little idea about the current rate of global warming,
>let
>alone its future rate. Climate experts are still trying to explain why
>satellites measuring the temperature of the Earth have detected little
>sign
>of global warming - despite taking measurements during supposedly the
>warmest
>period on record.
>
>Some researchers suspect that the fault may again lie with the
>ground-based
>temperature measurements. They say that many of the data come from
>stations
>surrounded by growing urban sprawl, whose warmth could give a
>misleading
>figure. A study of data taken around Vienna, Austria, between 1951 and
>1996
>found that the air temperature rose by anything from zero to 0.6�C,
>depending
>on precisely where the measurements were made.
>
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