Letter reSeArCH
Extended Data Fig. 6 | Sea level pressure and the Pacific Decadal
Oscillation. a, Spatial pattern of sea level pressure (SLP) associated with
a 1σ increase in the PDO index^18. b, 1908–1941 SLP trends from the
NOAA’s 20th Century Reanalysis^28. c–g, Regressions of SST-PDO indices
against the SLP-PDO index for ICOADSb (c), ERSST5 (d), COBESST2 (e),
HadISST2 (f) and HadSST3 (g). The SLP-PDO index is computed from the
NOAA’s 20th Century Reanalysis, and the regression analysis is performed
for 1908–1941 (red) and 1948–2010 (black). h, Regression coefficients for
each dataset over 1908–1941 (red) and 1948–2010 (black). Note that the
y axis starts from 0.25 °C mb−^1. Error bars indicate 2 s.d. uncertainties.
ICOADSb has a similar regression coefficient over 1908–1941 to that
found using other SST datasets and other epochs.