PerspectiveClimate Change

Has there been a hiatus?

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Science  14 Aug 2015:
Vol. 349, Issue 6249, pp. 691-692
DOI: 10.1126/science.aac9225


  • A staircase of rising temperatures.

    (A) Seasonal (December-January-February; etc.) global mean surface temperatures since 1920 (relative to the 20th-century mean) vary considerably on interannual and decadal time scales. Data from (19). (B) Seasonal mean PDO anomalies (8) show decadal regimes (positive in pink; negative in blue) as well as short-term variability. A 20-term Gaussian filter is used in both to show decadal variations, with anomalies reflected about the end point of March to May 2015 (heavy black curves). (C) Decadal average anomalies (starting 1921 to 1930) of GMST (green) along with piecewise slopes of GMST for the phases of the PDO (orange). Note how the rise in GMST (A) coincides with the positive (pink) phase (B) of the PDO at the rate given in (C).

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