Composition of the Atmosphere
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1 Introduction to Oceanography Lecture 15: Wind Atmospheric water vapor map, Sept. 13 Nov. 2, Data from Composition of the Atmosphere Dry Air: 78% Nitrogen, 21% Oxygen BUT it is never completely dry Typically contains about 1% water vapor Chemical residence time of water vapor in the air is about 10 days (liquid water residence time in ocean: 3x10 3 years!) Liquid evaporates into the air, then is removed as dew, rain, or snow Warm air holds much more water vapor than cold air Figure by Greg Benson, Wikimedia Commons Creative Commons A S-A 3.0, Density of Air Typical air density ~ 1 mg/cm 3 About 1/1000th the density of water Temperature and pressure affect the density of air Temperature: Hot air is less dense than cold air Pressure: Air expands with elevation above sea level Air is much easier to compress than water Elevation (m) Mt. Whitney 4421m Passenger jet 10-13km Everest 8848m Rising air expands & cools Vapor condenses into clouds, precipitation Sinking air is compressed and warms Clear air Density & temperature of Air 2000 meters 1000 meters 24ºC 0 Empire State Bldg. 450m Pressure (N/m 2 ) Figure by E. Schauble, using NOAA Standard Atmosphere data. Figure adapted from Nat l Weather Service/NOAA, Public Domain, esource/jetstream/synoptic/clouds.htm 34ºC (1.4% H 2 O) Expanding Air Cools and Condenses Like opening a pressurized bottle of soda Air expands and cools Water vapor condenses -- cloud formation MMovies by J. Aurnou, E. Schauble, UCLA 2000 meters mov meters 24ºC Figure adapted from Nat l Weather Service/NOAA, Public Domain, esource/jetstream/synoptic/clouds.htm 34ºC (1.4% H 2 O) 1
2 Solar Heating of the Earth Solar energy absorbed unevenly over Earth s surface Energy absorbed / unit surface area varies with: Angle of the sun Reflectivity of the surface (i.e., ice v. ocean) Transparency of the atmosphere (i.e., clouds) Solar Heating of the Earth Sunlight heats the ground more intensely in the tropics than near poles file:///users/schauble/epss15_oceanography/images_ and_movies/insolation2.swf Heilemann CCU/NSF Flash Sunlight intensity (top of atmosphere) Sunlight intensity (ground) Przemyslaw "Blueshade" Idzkiewicz, Creative Commons A S-A 2.0, le:earth-lighting-wintersolstice_en.png Figure by William M. Connolley using HadCM3 data, Wikimedia Commons, Creative Commons A S-A 3.0, on.png June 20-21: N. Pole tilted towards Sun Solar Heating & the Seasons Not to scale! May 9: We are here March 20-21: Sun shines on both poles equally Solar Heating & the Seasons Sept : Sun Dec 21-22: N. shines on both poles Pole tilted away equally from Sun Background image: Tauʻolunga, Creative Commons A S-A 2.5, Seasons are caused by Earth s 23.5 o tilt Northern summer: north hemisphere points at sun NASA animation by Robert Simmon, Public Domain, data 2011 EUMETSAT Redistribution of Solar Heat Energy Equator absorbs more heat from the sun than it radiates away (net > 0). Polar regions radiate much more heat than they absorb from the sun(!) E.g., Equator isn t that Hot; Poles aren t that Cold Evidence that the atmosphere (~2/3) & oceans (~1/3) redistribute heat Result: convective heat transfer moderates climate CERES/NASA animation, Public Domain, 2
3 Redistribution of Solar Heat Energy Atmospheric Circulation Without Rotation Cold, more dense air sinks near the Poles POLES EQUATOR Background image from Smári P. McCarthy, Creative Commons A S-A 3.0, dia.org/ wiki/file:earth_equator _northern _hemisphere.png Warm, less dense air rises near the Equator Convective heat transfer moderates Earth climate Heated air expands & rises, then cools & sinks Adapted from image at Public Domain? Cold, more dense air sinks near the Poles The Coriolis Effect on Earth Surface velocity increases from pole to equator Points on the equator must move faster than points near the poles to go around once a day Latitude velocity differences lead to curving paths Example: Merry-go round To an Earthbound observer (i.e., us): Northern Hemisphere: Earth s rotation causes moving things to curve to their right Moving things: Air masses, oceanic flows, missiles, anything with mass Southern Hemisphere: Earth s rotation causes moving things to curve to their left The Coriolis Effect National Snow and Ice Data Center, free for educational use, National Snow and Ice Data Center, free for educational use, ml But wait why do storms (including hurricanes and cyclones) go backwards? Atmospheric Circulation including Coriolis Northern Hemisphere: Hurricane Isabel (2003) NASA, Public Domain, Southern Hemisphere: Cyclone Drena (1997) NASA, Public Domain, 7/drena.vis.gif (now moved) Questions? Figure from NASA, Public Domain, 3
4 Atmospheric Circulation including Coriolis Actual forecast of surface winds Pacific surface wind forecast-hindcast, National Weather Service Environmental Modeling Center/NOAA, Public Domain, GIF by E. Schauble using EZGif 3 convection cells in each hemisphere Each cell: ~ 30 o latitudinal width Vertical Motions Rising Air: 0 o and 60 o Latitude Sinking Air: 30 o and 90 o Latitude Horizontal Motions Zonal winds flow nearly along latitude lines Zonal winds within each cell band DUE TO DEFLECTIONS BY CORIOLIS! Atmospheric Circulation including Coriolis 3 Cells per hemisphere: Polar Active (updraft on hot side, downdraft on cold side) Ferrel Passive (downdraft on hot side!) Hadley Active Atmospheric Circulation including Coriolis Latitudinal winds: 0-30 o : Trade Winds o : Westerlies o : Polar Easterlies UCLA figure background image unknown. Figure by Hastings, Wikimedia Commons, Creative Commons A S-A 1.0 Generic, Atmospheric Circulation including Coriolis Cell Boundaries: 60 o : Polar Front 30 o : Horse Latitudes Horse Latitudes Polar Front Questions Doldrums 0 o : Doldrums Vertical air movement (up at Polar Front and Doldrums, down at Horse Latitudes) Figure by Hastings, Wikimedia Commons, Creative Commons A S-A 1.0 Generic, Figure from NASA, Public Domain, 4
5 Local Meteorology of Southern California Marine layer against the Southern California mountains Photo by Dr. Jonathan Alan Nourse, CalPoly Pomona, Mediterranean Climate LA: Subtropical latitude, abutting ocean Subsiding flow: sinking air Clear most of the year Effects of coast: Higher humidity--- thermal buffer Winter Storms Pole-equator temp difference larger in winter Speeds up jet stream, big storms get pushed our way Sea Breeze Land Breeze Land warms fastest during the day. Air expands and rises Land cools fastest at night. Air contracts and sinks Ocean surface temperature changes slowly. Air displaces less dense rising air on land. T hi s Ocean surface temperature changes slowly. Air is pushed away and up by cooler denser land air. Result wind from sea towards land Jesús Gómez Fernández, Wikimedia Commons, Creative Commons A S-A 3.0, Result wind from land towards sea Adapted from Jesús Gómez Fernández, Wikimedia Commons, Creative Commons A S-A 3.0, Marine Layer Cold waters, warm air: thin cloud layer on ocean surface Subtropics: H pressure, regional subsidence Cloud layer flows onto land at night Evaporates over land by day UCLA Marine Layer LAND OCEAN UCLA figure Time lapse -- Sept. 23, 2003(?), J. Aurnou, UCLA 5
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