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Lecture2 - General Atmospheric Science Review Goal Review...

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1 1 General Atmospheric Science Review Goal: Review basic concepts and terminology What is it we’re really investigating through atmospheric remote sensing? 2 The Climate System Science Goals: (1) To understand how all of the natural processes in this system interact to define our basic climate; (2) To understand the extent to which human activities are perturbing the natural scheme of things. Why remote sensing, esp. via satellite ?? RT!!
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2 3 Troposphere Temperature decreases with alt 75% of atmospheric mass Weather Stratosphere Temperature increases with alt Ozone layer O3 UV absorption: protection Mesosphere Temperature decreases with alt Noctilucent clouds Meteor Ablation Thermosphere Temperature increases with alt Aurora Ionosphere ~60-500 km Charged atoms/molecules AM Radio Temperature Structure of the Atmosphere ~220 K ~260 K ~180 K 4 Thermosphere Aurora Charged particles (e-, p+) from magnetosphere Enter atmosphere along magnetic field lines Emission from excited O atoms and N 2 O: Red > 300 km, Green 100-300 km N 2 : Red ~100 km ~100-300 km Occur all the time © Jan Curtis
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3 5 Mesosphere Noctilucent Clouds Also known as Polar Mesospheric Clouds Water ice clouds at the summer polar mesopause (~82 km, 50 miles) Aeronomy of Ice in the Mesosphere (AIM) mission studies PMCs Possible “miner’s canary” of global change in the mesosphere © P-M Heden 6 Stratosphere Ozone Depletion Stratospheric ozone protects against UV radiation Antarctic ozone “hole”: August – October > 50% of O 3 is destroyed Depletion caused by chlorine and bromine compounds that are largely anthropogenic Arctic ozone is also depleted in many winters, by ~30% when conditions are appropriate.
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