Related by context. Frequent words. (Click for all words.) 62 hydrologic cycle 60 carbon dioxide concentrations 59 terrestrial ecosystems 59 biogeochemical 59 aerosol particles 59 clathrates 58 potent greenhouse gas 57 upper troposphere 57 atmospheric CO2 57 deglaciation 57 atmospheric methane 57 hydrological cycle 57 atmospheric CO 56 forcings 56 hydroxyl radicals 56 biogeochemistry 56 biogenic 56 nitrification 56 phytoplankton blooms 55 isoprene 55 spatial scales 55 poleward 55 radiative forcing 55 atmospheric pollutants 54 absorbs carbon dioxide 54 deplete oxygen 54 absorbing carbon dioxide 54 isotopic composition 54 gigatonnes 54 gaseous emissions 54 CO ² 54 CO2 54 carbon dioxide 53 greenhouse gases GHGs 53 CO -2 53 planktonic 53 tropospheric 53 methanogens 53 fatty acid metabolism 53 acidify 53 mid latitudes 53 atmospheric concentrations 53 nitrogen fixation 53 plankton blooms 52 atmospheric CO2 concentrations 52 CO2 concentrations 52 bioaccumulation 52 nitrogen trifluoride 52 SO2 emissions 52 Nitrogen oxides 52 sulfur dioxide SO2 52 amphipods 52 airflows 52 nitrogen oxide NOx emissions 52 isotope ratios 52 denitrification 52 desorption 52 fluxes 51 carbon dioxide CO2 51 biosphere 51 sequester carbon dioxide 51 uranium thorium 51 Co2 51 bile acid 51 atmospheric carbon dioxide 51 atmospheric chemistry 51 GHGs 51 oxidise 51 acidifying 51 diatoms 51 solar irradiance 51 tropopause 51 emit CO2 51 gigatons 51 interstellar clouds 51 co2 51 microbial ecology 50 atmospheric circulation 50 sulphates 50 elemental composition 50 warmings 50 El Niño Southern Oscillation 50 upwellings 50 hydrothermal activity 50 perturbations 50 gyres 50 Rignot 50 volcanic vents 50 nitrous oxide emissions 50 anthropogenic 50 abiotic 50 oxygen isotopes 50 anoxic 50 methane 50 Scientists theorize 49 nitrous oxides 49 radiative 49 polar vortex 49 iron fertilization 49 Equatorial Pacific 49 ozone depletion