README! Antarctica near-surface air temperature reconstructions for O'Donnell, Lewis, McIntyre, and Condon (2010), Improved methods for PCA-based reconstructions: case study using the Steig et al. (2009) Antarctic temperature reconstruction, published in Journal of Climate. 1. FILE DESCRIPTIONS This directory containts 9 data files and 1 pdf: a. rls.recon.txt: The 600 x 5,509 matrix of anomalies for the main RLS recon presented in the text. The beginning time step is January, 1957. b. e_w.recon.txt: The 600 x 5,509 matrix of anomalies for the main E-W recon presented in the text. The beginning time step is January, 1957. c. Tir_lons.txt: A vector of grid cell longitudes (5509 cells). This file was originally produced by Steig et al. (2009) and has been duplicated here with permission from Dr. Eric Steig. d. Tir_lats.txt: A vector of grid cell latitudes (5509 cells). This file was originally produced by Steig et al. (2009) and has been duplicated here with permission from Dr. Eric Steig. e. manned.txt: A 636 x 44 matrix of READER manned station observations, archived on 27 November 2009. (An R-object ("manned.RData") that is directly loadable into R is also included as an alternative archive.) The beginning time step is January, 1957. f. aws.txt: A 636 x 65 matrix of READER AWS station observations, archived on 27 November 2009. (An R-object ("aws.RData") that is directly loadable into R is also included as an alternative archive.) The beginning time step is January, 1957. g. RO10 Code.txt: The complete code used to produce the reconstructions. The settings used for the paper are loaded as the default settings. The code was written entirely in R. h. SI Revised 8-12-10.pdf: Supplementary information not present in the main text. 2. FILE FORMATS The matrix data files are ASCII files, white-space delimited. The reconstructions are stored in a by-row format; i.e., the first 5,509 values listed correspond to ROW 1, COLUMNS 1 - 5,509, for the first time step. The next 5,509 values correspond to the second time step, and so forth. The latitudes and longitudes are vectors, presented in the same order as the reconstruction columns. Metadata for the manned and AWS station data are contained in the code.