• Coastal and Marine systems
  • Surface waters: rivers, lakes, wetlands
  • Groundwater: the subsurface and hyporheic zone
  • Snow and ice
  • Atmosphere: stratosphere and troposphere
  • Aerosols, rain and fog
  • Air: Ambient, indoor, and urban air
  • Soils, sediments, peat, and permafrost
  • Surfaces in the natural and built environment