Can Naval War be ignored when the collected SST are “out of
tune”?
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Original Figure from: http://bobtisdale.blogspot.com/2009/03/large-1945-sst-discontinuity-also.html
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Thompson, Kennedy, Wallace & Jones; 2008, Nature, V.453/P.246 (Summary) A large discontinuity in the mid-twentieth century in observed
global-mean surface temperature. Data sets used to monitor the Earth's climate indicate that the
surface of the Earth warmed from 1910
to 1940, cooled slightly from 1940
to 1970, and then warmed markedly from 1970
onward. The weak cooling apparent in the middle part of the century has been
interpreted in the context of a variety of physical factors, such as
atmosphere–ocean interactions and anthropogenic emissions of sulphate
aerosols. Here we call attention to a previously overlooked discontinuity in
the record at 1945, which is a prominent feature of the cooling trend in the
mid-twentieth century. The discontinuity is evident in published versions of
the global-mean temperature time series1,
but stands out more clearly after the data are filtered for the effects of
internal climate variability. We argue that the abrupt temperature drop of 0.3 °C
in 1945 is the apparent result of uncorrected instrumental biases in the sea
surface temperature record. Corrections for the discontinuity are expected to
alter the character of mid-twentieth century temperature variability but not
estimates of the century-long trend in global-mean temperatures. COMMENT:
The data have been discussed frequently (e.g. Wright
1986; Folland & Parker, 1995),
and the use of WWII data is highly questionable anyhow (Bernaerts,
WWII-SST-Pacific 1997 & WWII-SST-Atlantic 1998). It surprises that
Thompson et al. do not even consider the impact the naval war may have had on
the SST. Bob Tisdale discusses their result and point to the increased
cloudiness during WWII, concluding: Unless the
datasets were used to infill one another during the 1940s, or unless the
"bucket adjustments" also somehow magically apply to Marine Air
Temperature and Cloud Cover data, the similarities in the shifts of the SST ,
the Cloud Cover and the Marine Air Temperature datasets would make one
question the conclusions of the Thompson et al (2008) paper. http://bobtisdale.blogspot.com/2009/03/large-1945-sst-discontinuity-also.html |
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Chapter: 4_11 |
Book Page: 213a |
File: none |
Image: www.bobtisdale.blogspot.com |
This information is related to: http://climate-ocean.com/ (Chapter; see
bottom-left-box)