Bill Gates files for patents for a method that controls hurricanes by using large fleets of ships to mix colder water with warmer surface water.

[link to www.techflash.com]

Recent patent filings have shown Bill Gates and his friends exploring subjects as diverse as electromagnetic engines and beer kegs. Now they're thinking even bigger -- trying to stop hurricanes.

Microsoft's chairman is among the inventors listed on a new batch of patent applications that propose using large fleets of vessels to suppress hurricanes through various methods of mixing warm water from the surface of the ocean with colder water at greater depths. The idea is to decrease the surface temperature, reducing or eliminating the heat-driven condensation that fuels the giant storms.

The filings were made by Searete LLC, an entity tied to Intellectual Ventures, the Bellevue-based patent and invention house run by Nathan Myhrvold, the former Microsoft chief technology officer. Myhrvold and several others are listed along with Gates as inventors.

The diagram at right is from one of five related patent applications made public this morning. So how exactly do they plan to stop hurricanes? Here's an excerpt from the filing that explains the diagram.

Vessel 100 is a tub-like structure having one or more walls 110 and a bottom 115. Vessel 100 may be held buoyant in the water by one or more buoyancy tanks 120 which may be used to maintain the buoyancy of vessel 100 and further may be used to control the height of walls 110 above the water level. Vessel 100 also includes a conduit 125 whose horizontal cross section is substantially smaller than the horizontal cross section of the tub portion 130 of the vessel defined by walls 110. In an exemplary embodiment, conduit 125 extends well below the ocean surface including depths below the ocean's thermocline.

In most circumstances, most of the sunlight impinging on the ocean surface is absorbed in the surface layer. The surface layer therefore heats up. Wind and waves move water in this surface layer which distributes heat within it. The temperature may therefore be reasonably uniform to depths extending a few hundred feet down from the ocean surface. Below this mixed layer, however, the temperature decreases rapidly with depth, for example, as much as 20 degrees Celsius with an additional 150 m (500 ft) of depth. This area of rapid transition is called the thermocline. Below it, the temperature continues to decrease with depth, but far more gradually. In the Earth's oceans, approximately 90% of the mass of water is below the thermocline. This deep ocean consists of layers of substantially equal density, being poorly mixed, and may be as cold as -2 to 3.degree. C.

Therefore, the lower depths of the ocean may be used as a huge heat/energy sink which may be exploited by vessel 100. When vessel 100 is deployed at sea, waves 135 may lap over the top of walls 110 to input warm (relative to deeper waters) surface ocean water into tub 130. Tub 130 will fill to a level 140 which is above the average ocean level depicted as level 145. Because of the difference between levels 140 and 145, a pressure head is created thereby pushing warm surface ocean water in a downward direction 150 down through conduit 125 to exit into the cold ocean depths (relative to near surface waters) through one or more openings 155. In an exemplary embodiment, the depth of opening 155 may be located below the ocean's thermocline, the approximate bottom of which is depicted as line 160. This cycle will be continuous in bringing warm surface ocean water to great depth as ocean waves continue to input water into tub 130. If many of vessel 100 are distributed throughout a region of water, the temperature of the surface of the water may be altered.

"Many" is the important concept there at the end.

Gates, Myhrvold and associates aren't the first to propose reducing the ocean's surface temperature as a means of suppressing hurricanes, said David Nolan, an associate professor of meteorology and physical oceanography at the University of Miami's Rosenstiel School of Marine and Atmospheric Science.

"Every couple of years there's a news story that gets picked up for some hurricane-suppression idea," Nolan said via phone this morning. "They’re all kooky in their own way. Some of them are more plausible than others, but they all face an enormous problem of scale. ... You would have to cover an incredible area with this effect to reduce the temperature of the ocean by a significant amount."

Of course, a big difference in this case is that one of the people making the suggestion is one of the world's richest men. But don't look for Gates to fund the deployment of thousands of these vessels. One of the patent filings proposes paying for the equipment through the sale of insurance policies in hurricane-prone areas, in addition to funding from state, federal and local government agencies.

Patent watcher "theodp," who tipped us off to the filings, says he was reminded of "The Simpsons" as he read through them. "The richest man in the world hatches a plan to alter weather and ecology in return for insurance premiums and fees from governments and individuals," he writes. "It's got kind of a Mr. Burns feel to it, no?"

The hurricane-suppression patent applications date to early 2008, but they were first made public this morning.

These and previous Searete LLC patent filings are believed to result from brainstorming sessions regularly held by Intellectual Ventures, in which Gates has been known to take part. It's not clear how or when Intellectual Ventures might go forward with any of these ideas.