BIOB50H3 Lecture Notes - Lecture 1: Longwave, Axial Tilt, Transpiration
8 Sep 2017
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Lecture 1: organisms and their environment the physical. Climate long term average weather, determined by solar radiation, global patterns of wind and ocean circulation, and topography; most fundamental part of the physical environment. Weather current conditions (temperature, rainfall) of an area; short-term. Most of the world"s ecosystems are driven by the sun 342 w/m2 reaches the upper atmosphere in the form of uv, visible light, etc. 1/3 is re ected back by clouds, aerosols, earth; doesn"t impact heat since it is just visible light. 1/5 is absorbed by ozone layer, clouds, atmospheric water vapour. 50% is absorbed the earth if all of it was absorbed, the temperature would just keep going up; incoming radiation has to be balanced by the outgoing. To keep earth"s temperature the same, energy gains have to be balanced by energy losses lots of solar radiation absorbed by earth"s surface is emitted to atmosphere as infrared radiation (longwave radiation)
