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ERTH 1030 Notes: Chapter 5

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Department
Earth Sciences
Course
ERTH 1030
Professor
Dr.Anne- Marie Ryan
Semester
Winter

Description
Geography  1030  Notes       Chapter  5:  Atmospheric  pressure  and  wind   Atmospheric  pressure  is  pressure  exerted  by  the  atmosphere  by  the  force  of  gravity  acting  on  the   overlying  column  of  air     Measuring  atmospheric  pressure:   Units:  milibars  (mb)   Standard  sea  level  pressure=  101.325  kPa   Center  of  a  storm  with  rising  warm  air  will  have  a  pressure  <1013  mb     Measuring  using  a  barometer:   Relies  on  the  atmospheric  pressure  pushing  down  on  heated  mercury  in  turn  measures  atmospheric   pressure     Atmospheric  pressure  and  altitude:   Air  density  depends  on  pressure  and  temperature   Atm  pressure  decreases  with  altitude   So  therefore  density  decreases  with  altitude       Know  the  pressure/altitude/density  diagram     Wind  Speed  and  Direction   Wind:  horizontal  movement  of  air,  anometer   Wind  direction:  the  direction  from  which  the  wind  comes.  Ex.  The  west  wind  comes  from  the  west   Wind  speed  and  direction  are  determined  by  three  factors   1. pressure  gradient-­‐  high  to  low  pressure  movement     2. cariolis  effect:  earths  rotation  (pull)   3. friction:  from  earths  surface  (barriers  to  the  wind  ex.  Mountains,  oceans,  etc.)     Pressure  Gradient   Isobars▯lines  of  equal  pressure   Progress  from  high  to  low  pressure   If  this  was  the  o
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