Warming Signs Accumulate - Thinner Glaciers, Saltier Oceans - CSM

[hatrack]

"Earth has a message for global warming skeptics: Its effects are starting to appear where it really counts. Antarctic glaciers are melting faster than scientists had thought. The tropical "firebox" that drives the atmosphere's weather machine is running hotter. These two developments could significantly change our planet's weather patterns.

Roughly speaking, Earth's weather machine is like a steam engine with a boiler (the tropical and subtropical oceans) and a condenser (the cooler higher latitudes). Masses of water vapor flow into the atmosphere from the boiler and travel north or south. These masses condense into rain or snow, releasing the heat they absorbed when they evaporated. Much of the water finds its way to the polar seas and flows back to the tropics. This interchange maintains our planet's distribution of solar heat and fresh water. Research suggests that this heat/moisture distribution is changing, which could shift the location and timing of rainfall, droughts, and floods.

The telltale signal: salt. When the boiler evaporates seawater, it leaves salt behind. The hotter the boiler, the saltier the water. Indeed, the tropical seas across the Atlantic are getting saltier, according to a Nature article last December by Ruth Curry at the Woods Hole Oceanographic Institution in Massachusetts and colleagues - and an update by her last month.

EDIT

Antarctica also shows signs of a significant climate change. Three international studies reported by NASA on behalf of the various research teams show more ice loss and glacial movement than had been expected. While glaciers all over the world are losing ice, the release of vast water masses locked in Antarctic land-based ice would cause the biggest rise in sea level. The studies show western Antarctic glaciers are shrinking "substantially" faster than observed in the 1990s, NASA reports. "They are losing 60 percent more ice into the Amundsen Sea than they accumulate from inland snowfall."

EDIT

http://www.csmonitor.com/2004/1007/p14s01-cogn.html

[Dogmudgeon]

1. More salt in the water in the tropics, less near the poles

That translates to some significant impacts on oceanic thermohaline circulation. Eventually, it will mean a significant amount of atmospheric water vapor will move poleward, the kind of thing that causes destructive weather.

I'm not sure what kind of event(s) will finally break the atmospheric heating cycle, but when it does, there will be excellent skiing conditions for the next hundred millenia. More or less.

And if the warming cycle bypasses the normal terrestrial feedback systems and doesn't stop ... we'll all need to move to Mars.

--bkl