Extended Data Fig. 3: Comparison of subarctic Atlantic CPR compositing techniques.
From: Industrial-era decline in subarctic Atlantic productivity
a, b, Data availability (ad 1958–2016) by CPR standard region (Methods) for annually derived (a; ≥8 out of 12 months per year of data required) and summertime-derived (b; ≥4 out of 6 months per year during April–May–June–July–August–September) data. c, d, Three approaches for compositing time series of CPR-based planktonic abundance, for both annual (c) and summertime (d) data42 (see Supplementary Information). AWA, area-weighted averaging; ISD, inverse-squared distance-based data infilling; EOF, EOF-based data infilling. Thin dashed lines show standardized (z-score units relative to ad 1958-2016) raw annual relative abundances of plankton; bold lines show adjusted relative abundances, to correct for potential long-term biases in the volume of water sampled by CPR devices53,54. Note that the annual area-weighted averaged series is reproduced from Fig. 4a.
