Climatic Research Unit : Papers

Summer temperatures across northern North America: Regional reconstructions from 1760 using tree-ring densities

Briffa, KR, Jones, PD and Schweingruber, FH (1994)

Transfer function

The following table shows the relevant configuration file for the calibration/verification combinations:

Alayuk

configuration file

calibration

verification

opsk202.dat

opsk201.dat

opsk203.dat

1901-1940

1941-1983

1901-1983

1941-1983

1901-1940

-----


Tree chronology file: canalas.mxd

Climate data file: nhalaska.dat

To execute the transfer function run: run_recon_canalas_CH.sh

Mackeva

configuration file

calibration

verification

opsk212.dat

opsk211.dat

opsk213.dat

1901-1940

1941-1988

1901-1988

1941-1988

1901-1940

-----


Tree chronology file: canmack.mxd

Climate data file: nhmacken.dat

To execute the transfer function run: run_recon_canmack_CH.sh

Quebla

configuration file

calibration

verification

opsk234.dat

opsk233.dat

opsk235.dat

1901-1940

1941-1988

1901-1988

1941-1988

1901-1940

-----


Tree chronology file: canqueb.mxd

Climate data file: nhquebec.dat

To execute the transfer function run: run_recon_canqueb_CH.sh

For Alayuk and Quebla the above configuration reproduces the results in Table 2, Mackeva has some small discrepancies.

Reconstruction

To execute the reconstruction run:

run_recon_canalas.sh which picks up the coefficients file (coeffsk203.dat) and the parameters file (osrrecon203.par).

run_recon_canmack.sh which picks up the coefficients file (coeffsk213.dat) and the parameters file (osrrecon213.par).

run_recon_canqueb.sh which picks up the coefficients file (coeffsk235.dat) and the parameters file (osrrecon235.par).

The executable used is reconnorm_canada (compiled from reconnorm_canada.for - in this case an unmodified reconnorm.for).

The normalised output from the above (osrrecon203.dat, osrrecon213.dat and osrrecon235.dat) matches the original output (osrrecon203_ORIGINAL.dat, osrrecon213_ORIGINAL.dat and osrrecon235_ORIGINAL.dat).

The three time series (osrrecon_ts203.dat, osrrecon_ts213.dat and osrrecon_ts235.dat) output visually match the plots in Figure 4.

Created: August 2012, Colin Harpham