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caption: 'Panel A shows the annual mean temperature anomalies relative to a 1901–1960 baseline for global mean surface temperature and global mean tropospheric temperature. Short-term variability is superposed on a long-term warming signal, particularly since the 1960s. Panel B shows the linear trend of short (12-year) and longer (25-year) overlapping periods plotted at the time of the center of the trend period. For the longer period, trends are positive and nearly constant since about 1975. Panel C shows the annual mean Pacific Decadal Oscillation (PDO) index. Short-term temperature trends show a marked tendency to be lower during periods of generally negative PDO index, shown by the blue shading. (Figure source: adapted and updated from Trenberth 2015<tbib>ecda3d30-c9a4-4d78-af38-209b2d5530ae</tbib> and Santer et al. 2017;<tbib>2795efc8-a843-43e3-b81b-1d0bff06a6ea</tbib> Panel B, © American Meteorological Society. Used with permission.)'
chapter:
  doi: 10.7930/J08S4N35
  identifier: our-changing-climate
  number: 1
  report_identifier: climate-science-special-report
  sort_key: 3
  title: Our Globally Changing Climate
  url: https://science2017.globalchange.gov/chapter/1/
chapter_identifier: our-changing-climate
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create_dt: 2016-07-11T17:30:20
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    submission_dt: 2017-10-17T16:27:54
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    title: PDO Index
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    title: Temperature Anomaly
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