Data: Comment on "Testing the Fidelity of Methods Used in Proxy-Based Reconstructions of Past Climate"

Smerdon, J.E. and A. Kaplan, 2007: 'Comment on "Testing the Fidelity of Methods Used in Proxy-Based Reconstructions of Past Climate": The role of the standardization interval.' by Mann et al., Journal of Climate, 20(22), 5666-5670 (pdf).

UPDATE (9/9/2010): We have identified errors in the longitudinal orientation of the model data and pseudoproxy files as they were archived at the Mann et al. (2005, 2007) supplemental websites (here and here). All of the files linked below are based on these archived files and therefore are affected by the incorrect orientation of the target field and pseudoproxy sampling. The paper that describes these problems, evaluates their consequences and corrects the orientation of the model fields can be found here. The correct target field, pseudoproxy files and updated RegEM-Ridge reconstructions can be found here.

The target model field can be accessed here: csmsub.mat. The field comprises a 5x5 degree model grid that has been restricted to the 669 grids cells used in Mann et al. (2005). The format of csmsub.mat is a time-by-space matrix in which the first column is the 67.5 N, 2.5 E location and the subsequent columns increment first in longitude and then in latitude. A file containing the 669 grid cell locations can be found here gridlocs.txt. The area-weighted, true-model mean for these restricted sites can be accessed here: csmactmean.txt. The pseudo-proxy data and matlab codes can be found in the table below. The area-weighted results for the restricted Northern Hemisphere domain are also included in the table below. Please contact me at jsmerdon"at" if you would like the reconstructed fields. Both the model field and the pseudo-proxy data can be accessed at the original Mann et al. (2005) supplemental site, but we reproduce them here in a format compatible with the codes that we have written or modified. Not included below are the RegEM modules, which can be found at the Rutherford et al. (2005) supplemental site. Some of these codes were altered by Rutherford et al. (2005) from the original source files provided by Tapio Schneider.

This material is based upon work supported in part by the National Science Foundation (Grants: ATM0417909) and by the National Oceanographic and Atmospheric Administration (Grants: NA03OAR4320179 and NA07OAR4310060).