### Subject: Could we use endothermic reactions to reduce hurricane strength?

Date: Sat Sep 24 22:23:24 2005
Posted by Robert Clark
Grade level: teacher/prof School: Widener University
City: Chester State/Province: PA Country: USA
Area of science: Earth Sciences
ID: 1127625804.Es
Message:
```
Hurricanes need a temperature of 80º F, 26º C, to form.
Cooler waters in Hurricane Bonnie's wake caused Hurricane
Danielle to dissipate:
What Lies Beneath a Hurricane.
It only had to be reduced to 75º F for this to occur.
Could we cover the hurricane path with chemicals to reduce temperature?
Ammonium nitrate (NH4NO3) for example; 14 kg of ammonium nitrate
can freeze 14 liters, 14 kg, of water:
Re: Making ice without machinery
To reduce temperature only by 3º C, the amount can be reduced by a factor of
1/30th.
However, freezing has the advantage that it would take some time for it to
melt.
How much NH4NO3 would be required? For freezing, the same amount as
the water you wanted to freeze. To estimate, I'll use a size of the eye of 10
km across. This is an area of 100 square kilometers. The thickness depends on
how quickly it melts at 26º C.
Let's say 1cm thick. Then this is 10,000m x 10,000m x .01m =
1,000,000 m^3. This is 1,000,000 metric tons of water. Then it would require
that amount of NH4NO3.
It would require much less if you only wanted to decrease the
temperature 3º C, perhaps only 30,000 metric tons for the same
volume of water. However, the amount required might wind up being the
same since the ammonium nitrate would have to be continually supplied.

Bob Clark

```

Re: Could we use endothermic reactions to reduce hurricane strength?

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