Global water cycle:
• Oceanic – holds 97% of global water with ¾ in ice caps.
• Cryospheric water- high altitudes and latitudes
Accumulation is input to a glacial system
Ablation is output from melting.
Sublimation is ice directly into water vapour.
• Terrestrial – rivers, wetlands, aquifers and biological water
• Atmospheric – holds 0.001% due to fast fluxes and average residence time of 9 days.
Inputs into atmosphere from evapotranspiration. Transpiration accounts for 10%
atmospheric moisture.
Outputs from atmosphere from precipitation, condensation and ablation.
Global water cycle budget is 505,000 km3/yr
