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sci.geo.meteorology (Meteorology) (sci.geo.meteorology) For the discussion of meteorology and related topics. |
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#21
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#22
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#23
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This is actually one of the FAQ's on the National Hurricane Center
Website. http://www.aoml.noaa.gov/hrd/tcfaq/C5c.html (The "cool the water" option is also discussed too: http://www.aoml.noaa.gov/hrd/tcfaq/C5e.html ) John Aspen Research, - www.aspenresearch.com "Turning Questions into Answers" Opinions expressed herein are my own and may not represent those of my employer. |
#24
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Will Janoschka wrote:
On Sun, 25 Sep 2005 00:26:32, Uncle Al wrote: wrote: Hurricanes grow stronger over warm waters and correspondingly lose strength over cool waters. Hurricanes typically need an ocean temperature of about 80§ F, 26§ C, to form. This page shows the cooler waters following Hurricane Bonnie caused Hurricane Danielle following in Bonnie's wake to lose strength and dissipate: What Lies Beneath a Hurricane. http://science.nasa.gov/headlines/y2000/ast11sep_1.htm According to the graphic on this page, the temperature only had to be reduced to about 75§ F for this to occur. So could we cover the expected hurricane path with chemicals that produce a temperature reduction on mixing with water to reduce the ocean temperature? [snip crap] Cylinder of water 70 miles in radius and 25 feet deep. Cool from 90 F to 70 F, (pi)(112.65 km x 10^5)^2(7.62 meters x10^2)(11.11 C) -- 3.38x10^18 calories 3.38x10^18 calories = 1.41x10^19 joules = 3,378 megatonnes equivalent Ya gonna absorb that energy with dissolving ammonium nitrate, git? Cylinder of vegetable oil 70 miles in radius and 1 cm thick, (pi)(112.65 km x 10^5)^2(1) = 4x10^14 cm^3 = 10^11 gallons Gonna pour oil on troubled waters, git? Al again you are correct, but not very nice. Keep up the good work. The key fact is you don't have to cool 25 feet. Just the upper surface. Let's call it 1 cm. The 25 ft. estimate results in a number 25 ft * 30cm/ft = 750 too high. The temperature drop I'm assuming is also only 5 degrees F, not 20 F, based on an actually observed case where a hurricane dissipated after a temperature drop of only 5 F. So his estimate is an additonal factor of 4 too high. Then the estimate should be less by a factor of 3000 or .47 x10^16 joules, 4.7 x 10^12 kilojoules. Ammonium nitrate can remove 350 kJ of heat per kilogram: Making ice without machinery "Ammonium nitrate is a commonly available nitrogen fertilizer. It is very soluble. 1 kg of ammonium nitrate will dissolve in 1 litre of water. It will remove about 28 kJ of heat from the surroundings per mole of ammonium nitrate, which works out at 350 kJ per kg of ammonium nitrate..." http://www.madsci.org/posts/archives...5573.Ch.r.html So you would need (4.7x10^12)/350 = 14.3 x 10^9 kg of ammonium nitrate, 14 million metric tons. But notice he is also using a much larger area than would be necessary, a 70 mile radius. I assumed only a 10 km across area. This results in only 2.8 x10^5 kg, 280 metric tons. This is actually in the range that could be carried by the largest cargo transport aircraft. The ammonium nitrate could be sprayed from the air on the area that needed to be covered, actually following the path of the hurricane. Bob Clark |
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#26
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#27
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![]() Michael Moroney wrote: writes: 3.38x10^18 calories =3D 1.41x10^19 joules =3D 3,378 megatonnes equivale= The key fact is you don't have to cool 25 feet. Just the upper surface. Let's call it 1 cm. So we await your answer. How the hell are you going to make a 1cm thick layer of cooled surface water and keep it at the surface in hurricane- whipped seas, idjit? The plan is to spread the coolant on the surface within the eye or ahead of the planned track, where the seas and the winds are significantly reduced. It might still work to spread the coolant onto the surface within the high wind, rough sea region if you use a buoyant, slow release formulation where even if the there is great exchange between the surface and lower, warmer waters, the water that reaches the surface is also cooled by the coolant. Bob Clark |
#28
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#29
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The seas and the winds within the eye are always calmer. That's a
well-known fact about hurricanes. Hurricanes themselves despite their high winds travel rather slowly, perhaps 10-30 km/hr. If you had a supertanker dispersing the coolant you could have it follow along within the eye or it could precede ahead of it within its predicted track. Bob Clark |
#30
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