2a.THERMO - ES8007 Climate and Climate Change ES1007 Oceans...

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y.sg ES8007 Climate and Climate Change ES1007 Oceans, Atmosphere and Climate © NEA-MSS Thermodynamics Asst. Prof. WANG Xianfeng Asian School of the Environment Nanyang Technological University 26 January, 2016
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Vapour Pressure All objects emit radiation as long as they have a non-zero temperature on the k elvin (K) scale. x °C = (273.15 + x ) K The tropical atmosphere is driven thermodynamically and moisture plays a fundamental role in this process. Vapour pressure ( e ) is the partial pressure exerted by the water vapour in moist air. It is a measure of the amount of water vapour in the air. Saturated vapour pressure ( e s ) with respect to water or ice is the vapour pressure attained when the water vapour is in equilibrium with liquid water or ice. T C = temperature in degrees Celsius Bolton (1980) empirical formula When e > e s , condensation occurs. Don’t need to memorize this equation. Saturated vapour pressure increases exponentially with T e s 6.112 hPa exp 17.67 T C T C 243.5
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