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  • Trends in the amplitude of the annual cycle of tropospheric temperature. Trends are calculated over 1979 to 2016 and are averages from a large multi-model ensemble of historical simulations. The most prominent features are pronounced mid-latitude increases in annual cycle amplitude (shown in the red colors) in both hemispheres. Similar mid-latitude increases occur in satellite temperature data. Trends are superimposed on NASA’s “blue marble” image.
    Trends in the amplitude of the annual cycle of tropospheric temperature. Trends are calculated over 1979 to 2016 and are averages from a large multi-model ensemble of historical simulations. The most prominent features are pronounced mid-latitude increases in annual cycle amplitude (shown in the red colors) in both hemispheres. Similar mid-latitude increases occur in satellite temperature data. Trends are superimposed on NASA’s “blue marble” image.
  • Lawrence Livermore scientists have found that mid-latitude regions of Northern Hemisphere continents have a large seasonal cycle of atmospheric temperature, with frigid winters and hot summers. Satellite temperature data are consistent with models that project that this seasonal ‘heartbeat’ is becoming stronger with human emissions of carbon dioxide.
    Lawrence Livermore scientists have found that mid-latitude regions of Northern Hemisphere continents have a large seasonal cycle of atmospheric temperature, with frigid winters and hot summers. Satellite temperature data are consistent with models that project that this seasonal ‘heartbeat’ is becoming stronger with human emissions of carbon dioxide.
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