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Science 28 April 2006:
Vol. 312. no. 5773, p. 529
DOI: 10.1126/science.1120866
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Technical Comments

Comment on "Reconstructing Past Climate from Noisy Data"

Eugene R. Wahl,1* David M. Ritson,2 Caspar M. Ammann3

von Storch et al. (Reports, 22 October 2004, p. 679) criticized the ability of the "hockey stick" climate field reconstruction method to yield realistic estimates of past variation in Northern Hemisphere temperature. However, their conclusion was based on incorrect implementation of the reconstruction procedure. Calibration was performed using detrended data, thus artificially removing a large fraction of the physical response to radiative forcing.

1 Environmental Studies and Geology Division, Science Center, Alfred University, Alfred, NY 14802, USA.
2 Physics Department, Stanford University, Stanford, CA 94305, USA.
3 Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, CO 80307, USA.

* To whom correspondence should be addressed. E-mail: wahle{at}alfred.edu

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