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instrumentation and observing protocols has proven to be a major
To appreciate the issues involved in comparing estimates of
surface and lower tropospheric temperature trends, it is necessary
to have at least a rudimentary understanding of these three kinds
of measurements and the uncertainties inherent in each of them.
Chapters 6, 7, and 8 present this basic background information, and
the final chapter (9) discusses the issues involved in making
comparisons between the different kinds of measurements.
Collectively, these last four chapters of the report are the basis
for the findings and recommendations presented in chapters 3 and