Geology 1350 Lecture 11 Outline of Last Lecture I. Continued.II. PrecipatationOutline of Current Lecture I. Air Pressure and WindCurrent LectureAir pressure- caused by weight of the atmosphereLess molecules, surface pressure is being decreased, width of the air column does not changePressure is changed going up or downHeated columns expand (surface is displaced upward), cooler contracts (surface is displaced downward)If same mass of air in column the surface pressure is the sameOnly time when it changes is when one column transfers heat to the other, this happens so it gets equilibriumTemperature and elevation- the taller the column the greater upper level pressureUnstable-when there is motion (heating and cooling create motion), windsPressure measurement- barograph- recording aneroid barometerSurface maps- sea-level pressure maps are smooth lookingVariations in height of constant pressure surfaces- isobaric (constant pressure) surfaces rise and fall in elevation with changes in air temperature and density, the lower the denser and less atmosphereThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Ridges and troughs- troughs(upper level areas with low pressure) ridges (high
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