Fig. 2: Spatial patterns of temperature variability in instrumental data and pollen-based reconstructions.
From: Millennial-scale climate variability over land overprinted by ocean temperature fluctuations
a, Map of millennial variability estimated from the summer temperature spectra of pollen-based reconstructions as the mean PSD over the 1,000–3,000-yr timescale band in 4° × 4° spatial bins with opacity linearly proportional to the number of records in the bin and saturating when there are five records (see Extended Data Fig. 7 for raw and smoothed estimates). b, Map of the multi-decadal scaling exponent β from the spectra of instrumental temperature records fitted over the 10–60-yr timescale band. c, Map of sub-decadal variability, mean PSD over the 2–10-yr timescale band, estimated from the spectra of instrumental temperature records. A logarithmically spaced colour scale was used for a and c.
