Related by context. Frequent words. (Click for all words.) 59 temperature gradients 59 terrestrial ecosystems 58 nitrogen deposition 58 hydrologic cycle 56 poleward 55 hydrological cycle 55 chemical reactivity 55 atmospheric CO 55 ultra violet radiation 55 atmospheric ozone 54 photochemistry 54 marine sediments 54 reactive nitrogen 54 atmospheric nitrogen 54 sorption 53 refugia 53 Ultraviolet radiation 53 clathrates 53 phytoplankton blooms 53 isoprene 53 atmospheric methane 53 Methylmercury 53 plankton blooms 53 cryosphere 53 isotope ratios 53 photoperiod 53 stratospheric ozone 53 carbonate minerals 53 biogeochemical 53 nitrification 52 atmospheric pollutants 52 bioaccumulation 52 metastable 52 naturally occurring 52 temperature gradient 52 cellular membranes 52 photosynthesizing 52 photosynthetic organisms 52 diatom 52 stratospheric ozone layer 52 carbon dioxide concentrations 52 polar vortex 52 plasmon 51 upper troposphere 51 soils 51 ocean acidity 51 paramagnetic 51 deglaciation 51 sulfuryl fluoride 51 nutrient uptake 51 mycorrhizal fungi 51 subglacial 51 decoherence 51 tropospheric 51 microstructural 51 freshwater ecosystems 51 interstellar clouds 51 mid latitudes 51 alga 51 nitrogen fixation 51 atmospheric CO2 51 temperature inversions 51 absorbs moisture 51 migratory bird populations 50 habitat fragmentation 50 planktonic 50 harmful ultraviolet radiation 50 pasture grasses 50 aerosol particles 50 sun UV rays 50 cambium 50 collagen fibers 50 hydroxyl radicals 50 forest ecosystems 50 naturally occuring 50 Cyanobacteria 50 chromatin structure 50 subarctic 50 Ocean acidification 50 diatoms 50 nonlinearity 50 substorm 50 denaturing 50 mutagens 50 methane CH4 50 oxidise 50 absorbs carbon dioxide 50 microbial ecology 50 chloroplast 50 upwellings 50 proteolysis 50 acidifying 50 oestrogens 50 leakage currents 50 isotopic composition 50 alkaline soils 50 bilayer 50 microflora 50 permafrost 50 elemental composition 50 physicochemical