Related by context. Frequent words. (Click for all words.) 67 northern latitudes 63 equator 60 tropics 59 altitudes 58 troposphere 57 atmospheric circulation 56 equatorial 55 polar regions 52 equatorial Pacific 52 albedo 52 infrared wavelengths 51 ionosphere 51 Northern Hemisphere 49 auroras 49 Little Ice Age 49 elevations 49 abundances 48 greenhouse gas concentrations 48 circumpolar 48 atmospheric CO2 47 Antarctica 47 polar 47 temperate 47 atmospheric carbon dioxide 47 temperatures 47 warmer temperatures 47 volcanism 47 velocities 47 salinity 46 water vapor 46 jet stream 46 climates 46 upwelling 46 northern hemisphere 46 redshift 46 geomagnetic field 46 glaciation 45 glaciers 45 polar ice 45 mountain glaciers 45 orbits 45 oceans 45 wavelengths 45 ambient temperatures 45 Antarctic Peninsula 45 nighttime temperatures 45 intensities 45 higher elevations 45 cold climates 45 sunspots 45 reflectivity 45 lowlands 45 colder climates 45 arid regions 44 Enceladus 44 Tibetan Plateau 44 Southern Hemisphere 44 landforms 44 permafrost 44 Holocene 44 aurora 43 sunspot 43 perturbation 43 crustal 43 Arctic tundra 43 warmer climates 43 fluxes 43 southern hemisphere 43 infrared radiation 43 warm climates 43 planets 43 climatic conditions 43 oscillations 43 cosmic rays 43 glacial ice 43 warmer 42 equinox 42 vitamin D deficiency 42 seas 42 daytime highs 42 ambient temperature 42 tropical cyclones 42 Ellesmere Island 42 wintering grounds 42 Pleistocene 42 ultraviolet radiation 42 geosynchronous orbit 42 UV radiation 42 atmospheric 42 Arctic Ocean 42 subduction zones 42 temperature 42 greenhouse warming 42 plains 42 hydrothermal vents 42 daytime temperatures 42 cosmic ray 42 oceanic 41 taxa 41 sediments 41 phytoplankton