Safety 2,699 Salinity 3,768 Sampling 3,244 Sands 869 SAR 941 Satellite methods 4,649 Satellites (artificial) 1,611 Sea ice 17,148 Sea ice distribution 4,009 Sea level 909 Sea-level changes 2,137 Seasonal freeze thaw 966 Seasonal variations 10,838 Sea-surface temperature 1,400 Sea water 4,034 Sea water--Chemistry 2,161 Sea water--Salinity 886 Sedimentary rocks 1,936 Sedimentary structures 1,221 Sedimentation 4,449 Sediments 16,543 Sediment transport 2,178 Seismic methods 1,702 Seismic profiles 874 Seismic surveys 1,831 Settlement (structural) 1,119 Ships 1,630 Shore features 917 Shores 1,020 Silicates 1,298 Simulation 4,268 Slope processes 1,522 Slope stability 1,160 Snow 11,866 Snow accumulation 2,655 Snow composition 1,333 Snow cover 4,688 Snow cover distribution 3,836 Snow cover effect 2,698 Snow density 1,317 Snow depth 3,029 Snowdrifts 1,189 Snowfall 2,391 Snow hydrology 1,308 Snow loads 941 Snow mechanics 1,204 Snowmelt 4,181 Snow melting 982 Snow removal 2,043 Snow surveys 2,591 Snow water equivalent 2,442 Soil chemistry 1,890 Soil erosion 1,108 Soil formation 1,611 Soil freezing 3,246 Soil mechanics 2,508 Soil microbiology 1,037 Soil pollution 1,943 Soil profiles 998 Soils 7,619 Soil stabilization 1,063 Soil temperature 3,622 Soil tests 1,151 Soil water 1,681 Soil water migration 1,792 Solar radiation 2,807 Solifluction 938 Southern Ocean--Ross Sea 1,299 Southern Ocean--Weddell Sea 1,093 Spaceborne photography 2,964 Spatial distribution 2,254 Spatial variations 1,094 Spectra 2,820 Spermatophyta 912 Stability 1,265 Stable isotopes 4,597 Statistical analysis 9,517 Storms 1,110 Strains 1,166 Stratigraphy 4,197 Stratosphere 2,555 Stream flow 916 Stress 877 Stresses 2,014 Structural geology 1,814 Structures 1,858 Subantarctic regions 1,416 Subglacial observations 928 Submarine geology 1,950 Submarine topography 859 Subpolar regions 1,965 Supercooling 874 Surface temperature 1,144 Surface water 1,835 Surface waters 2,101 Surficial geology 1,207 Surveys 4,563 Swamps 2,191 Symposia 956 Synthetic aperture radar 1,964