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Subject: C5d) Why don't we try to destroy tropical cyclones by adding a
water absorbing substance ?
Contributed by Hugh Willoughby
"Dyn-O-Gel" is a special powder (produced by Dyn-O-Mat) that
absorbs large amounts of moisture and then becomes a gooey gel.
It has been proposed to drop large amounts of the substance into
the clouds of a hurricane to dissipate some of the clouds thus
helping to weaken or destroy the hurricane.
At HRD we tried the one possible way that "Dyn-O-Gel" could weaken a
hurricane in the MM5 numerical model. We saw an effect but it was
small (~1 m/s). The argument was that the glop would make raindrops
lumpy (i. e., non-aerodynamic) they would fall slower and increase
condensate loading, thus weakening the eyewall updraft. If, by
contrast, one increases the fall speed of the hydrometeors, the
storm strengthens (again by only ~1 m/s). In the numerical
experiments "decrease" meant reduce the fall velocity to half
the real value, and "increase" meant double the real value. The
foregoing effect is larger than anything one could hope to produce
in the real atmosphere.
The observation that the experiment that "Dyn-O-Gel" conducted actually
"dissipated" clouds is problematic. Did they watch any unmodified
clouds ? Isolated Florida cumuli have short lifetimes, and these
are just the ones an experimenter would logically pick.
Accepting for the sake of argument that they actually did have an
effect, the descriptions seem more consistent with an increase in
hydrometeor fall speed and accelerated collision coalescence, which the
numerical model results argue would strengthen the hurricane, but
not much. If this speculation proves to be correct, "Dyn-O-Gel"
might be useful for rainmaking during a dry spell, unlike
glaciogenic seeding which (in the tropics at least) tends to make
rainy days even more rainy--if it does anything at all.
One of the biggest problems is, however, that it would take a
LOT of the stuff to even hope to have an
impact. 2 cm of rain falling over 1 square kilometer of surface
deposits 20,000 metric tons of water. At the 2000-to-one
ratio that the "Dyn-O-Gel" folks advertise, each square km would
require 10 tons of goop. If we take the eye to be 20 km in diameter
surrounded by a 20km thick eyewall, that's 3,769.91 square kilometers,
requiring 37,699.1 tons of "Dyn-O-Gel". A C-5A heavy-lift transport
airplane can carry a 100 ton payload. So that treating the eyewall
would require 377 sorties. A typical average reflectivity in the
eyewall is about 40 dB(Z), which works out to 1.3 cm/hr rain rate.
Thus to keep the eyewall doped up, you'd need to deliver this much
"Dyn-O-Gel" every hour-and-a-half or so. If you crank the
reflectivity up to 43 dB(Z) you need to do it every hour. (If the
eyewall is only 10 km thick, you can get by with 157 sorties
every hour-and-a-half at the lower reflectivity.)
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