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Geophysical Fluid Dynamics

Geophysical Fluid Dynamics. “ … study of naturally occuring, large-scale flows on earth and elsewhere … ”. Definition Large-Scale: Time Scale of Motion > Rotational Period. L~10-m. Condensation cloud as an F/A-18 Hornet flies at or near the speed of sound. Photo by John Gay.

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Geophysical Fluid Dynamics

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  1. Geophysical Fluid Dynamics “… study of naturally occuring, large-scale flows on earth and elsewhere …” Definition Large-Scale: Time Scale of Motion > Rotational Period

  2. L~10-m Condensation cloud as an F/A-18 Hornet flies at or near the speed of sound. Photo by John Gay

  3. Geophysical Fluid Dynamics on Jupiter L L~10,000-km U~100-m/s L/U~27-days NASA

  4. { >>1 for Jet-on-Earth Rossby Number Ro=(U/L)/  <<1 for Wave-on-Jupiter Jet-on-Earth: L/U ~ 10/300 s = 33-ms Wave-on-Jupiter: L/U ~ 107/100 s = 27-days Compare time scale to the rate of rotation ? Earth:  ~ 2 / (24 hrs) Jupiter:  ~ 2 / (10 hrs)

  5. “Katrina” Aug.-2005 L~1000-km U~30 m/s L/U~9-hrs Ro~0.4

  6. Sea Surface Temperature Gulf Stream Eddies 1997

  7. Arctic Sea Ice off Alaska Summer 2001 from MODIS Optical Remote Sensing

  8. Mixing without rotation Mixing with rotation http://paoc.mit.edu/labweb/GFDlab.htm

  9. High Pressure High Pressure The waves have a period of about 3 or 4 days and a wavelength of 2000 to 2500 km [1200 to 1500 mi], typically (Burpee 1974).

  10. Atmospheric Jet Stream : http://squall.sfsu.edu/scripts/nhemjetstream_model.html 1 Jetstream passing north of the UK bringing settled, dry and warm weather 2 Jetstream passing further south, causing weather that is unsettled and cool for the time of year

  11. y Planetary “Rossby” Wave Dynamics x z y National Weather Service

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