Antarctic temperature reconstructions from Steig EJ, Schneider DP,
Rutherford SD, Mann ME, Comiso JC, Shindell DT. Warming of the Antarctic
ice sheet surface since the 1957 International Geophysical Year. Nature
457, p 459-462 (January 22, 2009).

All data are reported as monthly anomalies in degrees C.

"cloudmaskedAVHRR.txt" contains the monthly-averaged cloud-masked
satellite data used in the reconstruction presented in the main text (and
shown in Figures S1c and S1d). .  The 300 rows are months, starting with
1982 (January) at the top, and ending in 2006 (December) at the bottom.

"ant_recon.txt" 
contains the monthly-averaged data from the reconstruction
presented in the main text.  The 600 rows are months, starting with 1957
(January) at the top, and ending in 2006 (December) at the bottom.  The
latitude and longitude for each of the 5509 columns are given in the files
"Tir_lats.txt" and "Tir_lons.txt".

"ant_recon_detrend.txt" contains the monthly-averaged data from figure S4d
in the Supplementary text.  The 600 rows are months, starting with 1957
(January) at the top, and ending in 2006 (December) at the bottom.  The
latitude and longitude for each of the 5509 columns are given in the files
"Tir_lats.txt" and "Tir_lons.txt".

"ant_recon_pca.txt" contains the monthly-averaged data from Figure S4c.  
The 600 rows are months, starting with 1957 (January) at the top, and
ending in 2006 (December) at the bottom.  The latitude and longitude for
each of the 5509 columns are given in the files Tir_lats.txt and
Tir_lons.txt.

"ant_recon_aws.txt" 
contains the monthly-averaged data from Figure S3.  
The 600 rows are months, starting with 1957 (January) at the top, and
ending in 2006 (December) at the bottom.  The latitude and longitude for
each of the 63 columns are given in the files "aws_lats.txt" and
"aws_lons.txt".

"awsreconcorrected.txt" is a correction to the above file, using corrected
AWS data at two AWS stations.  See the note under "Raw Data" below.  The
resulting differences in the reconstruction are too small to be
discernable on the Figure S3, or in the trends for individual stations
given in Table S1 in the Supplementary Information that accompanies the
paper in Nature.  (Corrections for all stations in table S1 are in the
third decimal place (that is <0.01 degrees C/decade)).  The mean trend for
Antarctica changes by less than 0.004 degrees C/decade. The mean trend for
West Antarctica changes by less than 0.02 degrees C/decade.  Note also
there is a typo in Table S2.  The correct coordinates for station 'Harry'
are 83.0 S 238.6 E.  Note that none of these corrections have any impact
on the satellite-based reconstructions; no AWS data were used in those
reconstructions.

All of the original data used in these reconstructions are from publically
available data sources.  Any queries about the raw data should be directed
to the appropriate data centers.

Weather station data (both occupied and automatic weather stations)  from
the British Antarctic survey: http://www.antarctica.ac.uk/met/READER.  
Note that corrections have been made to AWS stations "Harry" and "Racer
Rock". See the READER web site for details. A matrix of the READER ground
station monthy anomalies -- as used in the paper -- is given in
"READER_groundstations.txt".  This file is 600 months (starting in 1957) 
by 42 locations.


AVHRR thermal infrared data: www.nsidc.org/data/avhrr,
ftp://eclipse.ncdc.noaa.gov/pub/OI-daily-v2

The RegEM code -- including the TTLS regression and truncation options as
used in the paper -- is available from Tapio Schneider's web site at
CalTech:  http://www.gps.caltech.edu/~tapio/imputation