Related by context. Frequent words. (Click for all words.) 69 sunspots 60 sunspot 60 Little Ice Age 58 atmospheric carbon dioxide 58 greenhouse gas concentrations 57 volcanism 57 ionosphere 57 atmospheric CO2 56 albedo 56 glaciation 56 cosmic ray 55 geomagnetic field 55 troposphere 55 ozone depletion 54 La Niña 54 cosmic rays 54 volcanic activity 54 solar flares 53 La Nina 53 mass extinctions 53 El Nino 52 latitudes 52 equinox 52 upwelling 52 climatological 52 gamma ray burst 52 auroras 52 meteor showers 51 anthropogenic 51 El Niño 51 oscillations 50 water vapor 50 polar regions 49 Perseids 49 aurora 49 precipitation 49 extinctions 49 magnetosphere 49 oscillation 49 cosmic microwave background 48 volcanic eruptions 48 infrared wavelengths 48 Greenland ice 48 equatorial Pacific 48 extrasolar planets 48 atmospheric 48 neutrinos 48 wind shear 48 Mayan calendar 48 tropical cyclones 47 gravitational waves 47 vernal equinox 47 climatology 47 northern latitudes 47 perturbation 47 redshift 47 equator 47 polar ice 47 plate tectonics 47 climatologists 47 supernova 47 meteor shower 46 Saturn rings 46 jet stream 46 luminosity 46 exoplanet 46 journal Geophysical Research 46 Trenberth 46 quasar 46 magnetic fields 46 brown dwarfs 46 supernovae 46 nighttime temperatures 46 infrared radiation 46 exoplanets 46 tropics 46 elliptical orbit 45 seismic activity 45 Uranus 45 convection 45 radioactive decay 45 snowmelt 45 neutrino 45 Martian atmosphere 45 convective 45 Northern Hemisphere 45 intensities 45 barometric pressure 45 quasars 44 gamma ray bursts 44 meltwater 44 heatwaves 44 Enceladus 44 Carbon dioxide 44 temperatures 44 cloudiness 44 warmer temperatures 44 ionization 44 reflectivity 44 Iapetus 44 rainfall