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Ocean/Atmosphere/ Geosphere/Biosphere

Ocean/Atmosphere/ Geosphere/Biosphere. Atmospheric Circulation and Climate Coreolis Force Horizontal Ocean Circulation Vertical Ocean Circulation Circulation and Animals ENSO. Solar Energy. Overall average Earth T: 15C Greenhouse gasses important to maintain

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Ocean/Atmosphere/ Geosphere/Biosphere

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  1. Ocean/Atmosphere/Geosphere/Biosphere Atmospheric Circulation and Climate Coreolis Force Horizontal Ocean Circulation Vertical Ocean Circulation Circulation and Animals ENSO

  2. Solar Energy Overall average Earth T: 15C Greenhouse gasses important to maintain Low light wavelengths (Visible light) to earth Earth re-radiates high wavelengths (heat; infrared)

  3. Solar Energy Angle of incidence effects how much E to particular area (Ice ablation is also important in re-radiation) Solar radiation effects surface atmosphere circulation: atmosphere convection cells --> surface trade winds

  4. Coriolis Force Hypothetical Frictional from Earth’s rotation N: clockwise (right) S: counterclockwise (left) Effects tradewinds, and ocean currents

  5. Ocean Heat Budget Q = flux Basic equation: Qin - Qout = net accumulation If Qin > Qout, accumulation If Qin < Qout, loss If Qin = Qout, balance Ocean heat: (Qsun + Qcirc) - (Qrad + Qevap + Qcond) = Ocean heat Qin Qout Currently: 53% evap, 41% radiation, 6% condensation Variable proportion of Qout per geographic region

  6. Continent Effects Higher range of T changes over continents Water is better insulator: holds onto heat Winter, midcontinent: high P Summer, midcontient: low P --> alters ocean influences on climate Mountains disrupt atmospheric circulation patterns Tibetan Plateau uplift and monsoonal circulation Chain reaction: Ocean + solar radiation effects --> convection cells --> precipitation + continental effects --> runoff, sediment --> into ocean --> effects primary productivity

  7. Horizontal Ocean CirculationGyres Wind driven: friction Trade winds from atmospheric convection cells Lead to equatorial currents which leads to western boundary currents which leads to eastern boundary currents Equatorial + W boundary + E boundary = Subtropical Gyre Subpolar gyres also exist, smaller

  8. Gulf Stream Western boundary current

  9. Gyres

  10. Horizontal Ocean CirculationEckman Transport Wind driven: friction Assumes ideal water conditions Surface water: 3% wind velocity Bottom usually < 100m But…ideal conditions not real Other currents, wind variation, boundaries, water layers

  11. Geostrophic Currents Differences in pressure: Pressure Gradient Force (PGF) Frictionless Water “piles up” in hill (max 1m; very low slope,100’s kms) Hi P uphill; water flows to lo P Coriolis force deflects flow When Coriolis = PGF --> Geostrophic Current Water circles “hill” Effects upwelling: ENSO events

  12. Vertical Circulation: Upwelling Upwelling Common along continental margins Currents moved away from area --> upwelling Supports world’s fisheries San Diego -- LA coastline and sharks

  13. Vertical Circulation: Upwelling

  14. Vertical Circulation: Downwelling Wind pushes water onshore: water sinks, moves offshore

  15. Cold Deep Currents Cold water sinks North Atlantic current, Antarctic Bottom Water hi O2, hi nutrients Balanced by upwelling

  16. Vertical CirculationThermohaline Circulation Density-driven Density is affected by temperature, salinity T effects > salinity effects Denser water sinks; less dense water rises  “Conveyer Belt”

  17. “Conveyer Belt” Residence time at depth: ~300yrs using C14 on whole conveyer belt: estimated 1000yrs

  18. Ocean circulation and Organisms Larval transport Adults: upwelling brings nutrients currents are predictable Transport Food timing of spawning After 1997-1998 El Nino/La Nina Green and blue in ocean is high phytoplankton bloom (artificial color)

  19. Zooplankton amounts Warmer colors = more zooplankton Blue hatch areas: sperm whale catches Gyres Conveyer Belt Upwelling

  20. In upper Paleozoic times, supercontinent Pangaea: one large ocean: how would ocean currents, climate, effects on organisms be changed?

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