EESB04H3 Lecture Notes - Lecture 6: Vise, Boundary Layer, Soil
23 Oct 2016
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Document Summary
Leads to accumulation of water vapour in atmosphere. Impact on climate, precipitation, various processes etc. Precipitation evapotranspiration = net(-/+) tells a lot about ecology and plants (wet/dry, types of animals etc. : extremely difficult to measure. Evaporation net loss of water from surface due to change in phase from liquid to vapour followed by net transfer of this vapour to atmosphere. Boundary layer of water above soil, evapotranspiration as two-step process: change in phase from liquid to vapour being above soil, movement of vapour into atmosphere. Transpiration net loss of water from within leaves of plants, through stomata. Et net loss of water through sum of these two processes. Main source of energy for et = sun. Specifically, net accumulation of energy at surface (q*) and that fraction that is available for latent heat flux. When water moves from liquid to gas, q(le) denoted as negative flux, meaning energy = absorbed)
