Solid body rotation:
the parabolic shape taken up by the free surface of water in solid body rotation
is
studied. Similarly, we study why rotating planets take on the shape of an oblate
spheroid.
Dye stirring:
beautiful interleaving patterns are created by stirring colored dyes into a rotating
fluid. Examples from atmospheric and oceanic flows are studied.
Balanced
vortex:
the balance of forces in the momentum equation in a rotating frame of reference
is investigated by studying the flow of water down a drain-hole in a rotating system. The ideas
are applied to intense atmospheric vortices such as hurricanes.
Fronts:
we create fronts in the laboratory by bringing together two bodies of
water of differing densities in a rotating system. We study atmospheric fronts
using meteorological data.
Ekman layers: ageostrophic flow in a bottom Ekman layer is investigated in high and low
pressure surfaces created in the laboratory. The same phenomenon is studied in analyzed
surface fields of atmospheric highs and lows.
General circulation:
the Hadley circulation and middle-latitude weather
systems are studied in a rotating annulus experiment, using an ice bucket to represent
the pole, and in atmospheric data.
Convection: The evolution of convective boundary layers and convective plumes are studied as
an analogue of dry atmospheric and oceanic convection.
Flow over a barrier: this experiment investigates Rossby waves generated by
flow over a barrier on a beta plane.
Taylor Columns: The rigidity imparted to a fluid by rotation, as encapsulated in the
Taylor-Proudman theorem, is investigated by studying flow over a submerged
obstacle.
Density currents: The role of density differences in driving fluid motion is studied using an
experiment first carried out by Marsigli in 1695
Ekman pumping/suction: cyclonic and anticylonic circulations are set up in the laboratory through the
use of fans blowing air over the surface of the water to study the role of
Ekman layers in inducing vertical motion.
Ocean gyres: western intensification of the wind-driven ocean circulation is studied by
setting up a gyre in the presence of topographic beta.
Thermohaline circulation:
the thermohaline circulation of the ocean is studied in a rendition of the
classic Stommel-Arons experiment
Source/sink flow: flow from source to sink on a topographic beta plane is studied as an analogue
of mid-depth/abyssal circulation in the ocean.
Rossby waves: Rossby waves are studied by
investigating the ‘westward’ drift of a vortex induced by a melting ice cube in
a rotating fluid of variable depth. Rossby waves in the ocean, as seen from satellite
altimetry, are also presented.
----Textbook ---------------------------------
Laboratory experiments described in the Marshall and Plumb textbook: Atmosphere, Ocean
and Climate dynamics can be found
here.