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3680 VOLUME 13J O U R N A L O F C L I M A T E 2000 American Meteorological Society

Summary: 3680 VOLUME 13J O U R N A L O F C L I M A T E
2000 American Meteorological Society
A Method to Adjust Long-Term Temperature Extreme Series for
Nonclimatic Inhomogeneities
Northeast Regional Climate Center, Cornell University, Ithaca, New York
(Manuscript received 23 April 1999, in final form 10 January 2000)
A method to homogenize nonclimatic discontinuities in temperature extreme exceedence series is developed
and evaluated. The method is based on a set of complementary tests with the application of an individual test
depending on the availability of an adequate network of nearby homogeneous reference stations and the presence
of significant trends in the resulting difference or original exceedence series. Given a suitable set of neighboring
reference stations, a comparison of the differences in exceedences between the inhomogeneous station and
neighboring sites is made for the periods before and after the documented discontinuity. In the absence of one
or more reference stations, the exceedences at the inhomogeneous station are compared before and after the
nonclimatic change. A method by which nonstationary series are detrended and subsequently evaluated is also
When tested using homogenized data series into which an artificial discontinuity of known magnitude was
introduced, as many as 80% of the 1 F discontinuities were detected by the difference series approach. The
performance of the single-station exceedence series test was less accurate. Although in a few cases, less than


Source: Allen, Robert J. - Department of Earth Sciences, University of California at Riverside


Collections: Geosciences; Environmental Sciences and Ecology