Bacteria and Phytoplankton Affect the Weather

[Demeter]

http://www.washingtonsblog.com/2010/08/bacteria-and-phytoplankton-affect.html


It turns out that critters so small that they can't be seen with the naked eye might affect the weather, and perhaps even climate.

As I pointed out last year, spacefaring bacteria might affect rainfall:

In 2002, several scientists claimed that bacteria high in Earth's atmosphere came from space.

Last year, scientists said that bacteria in the upper atmosphere may actually make rain. Specifically, they said that bacteria can freeze at fairly warm temperatures, so that the "biological ice nuclei" form condensation nuclei which triggers rain.

Indeed, some scientists have speculated that bacteria cause rain as a means of transportation, so that they will "rain out" from the upper atmosphere to the surface of a planet.

Now, scientists have discovered a "hibernating" bacteria in a salt mine in Utah which they believe has been in suspended animation for 250 million years. There is evidence that this ability to hibernate for long periods of time is also useful for travel through space by the bacteria:

Bacteria have the ability to go into a kind of semi-permanent hibernation, but survival for this long was unheard of. After lying dormant in the salt crystal for 250 million years, the scientists added fresh nutrients and a new salt solution, and the ancient bacteria "re-animated."

Dr. Russell Vreeland, one of the biologists who found the bacteria, pointed out that bacteria can survive the forces acceleration via rubble thrown into space via a meteor impact. If it is possible for a bacteria to survive being off the planet and to stay alive within a salt chunk for 250 million years, then in a sort of "reverse-exogenesis" it may be possible that earth's own microbes are already out there.

Indeed, there is a more down-to-earth analogy to the idea of spacefaring bacteria: the humble coconut. Coconuts can float across long distances of water in the ocean, and when they land on a hospitable island, start growing.

Now, NOAA scientists say that phytoplankton affects hurricanes. As New Scientist writes:

Using a computer weather simulator, compared the formation of tropical storms in the Pacific under today's phytoplankton concentrations to conditions without any phytoplankton at all. What he found was an overall decrease in tropical storms in a phytoplankton-free digital Pacific.

The mechanism for this shift lies in phytoplankton's ability to absorb sunlight, which heats up the water around it. Without phytoplankton, the sun's rays penetrate deep into the ocean, leaving the surface water cold. Cool water has less energy than warm water, produces less of the moist air needed to build up tropical storms, and allows for stronger winds that can dissipate thunderstorms before they turn into typhoons (what hurricanes are called in the Pacific Ocean). All of this adds up to a Pacific Ocean that is less exciting and deadly than the one we currently have.

Because phytoplankton levels have dropped 40 percent since the 1950s, that may mean that hurricane frequency and/or intensity may decline...

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