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global warming - the science perspective


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Stoner's Avatar
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08-Jan-2010, 10:21 AM #46
Another interesting article ....... CO2 in the southern hemisphere:

http://sciencenow.sciencemag.org/cgi...ull/2010/107/2

excerpts>

Quote:
Much of the carbon dioxide in Earth's atmosphere goes south, literally. Researchers using new supercomputer models have described for the first time how the Southern Ocean sucks the greenhouse gas out of the air and then shuttles it into the deep sea far from the Antarctic.
Quote:
. Using data for 2005 and 2006, the first years that included these satellite observations, the team was able to pinpoint the wind patterns and currents that distribute ocean CO2. As the team reports in today's issue of Nature, instead of sinking in place, almost all of the CO2 is carried away from the Antarctic and toward the subtropics--hence the missing CO2 in the Southern Ocean.
Quote:
The researchers also found that "the atmosphere overlying the Southern Ocean is undergoing significant climate change," says oceanographer and lead author Takamitsu Ito, of Colorado State University, Fort Collins. It's possible, he says, that "changing the atmospheric wind pattern in the region could alter the rate at which the Southern Ocean absorbs CO2," possibly reducing the ocean's ability to consume the gas and leading to further global warming.

Oceanographer Michael Follows of the Massachusetts Institute of Technology in Cambridge, says the finding is significant because it demonstrates the dominant role that wind-driven currents play in transporting and storing carbon in the Southern Ocean. And it "reinforces how important changes in Southern Hemisphere winds can be for Earth's carbon cycle and its climate," he says.
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08-Jan-2010, 10:28 AM #47
hmmm....that is odd......wonder what is causing it to bypass the southern ocean......obviously it's not co2 saturated, but instead wind-driven.......nice find, SJ.....food for thought
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08-Jan-2010, 10:32 AM #48
It's probably the growing blight of Wind Turbine Farms changing the micro and macro vortex patterns.



Ergo: There ain't nothing for nothing in this spavined old World!

Basic law of Entropy.
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08-Jan-2010, 10:44 AM #49
also wonder what the ratio is for all the carbon absorbed per sea.....
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08-Jan-2010, 04:10 PM #50
I am also wondering if there is a comparison in the seas (all or many of them), of the absorption rate over any span of time...like to see if areas of the sea that are warming absorb less than before? Just a thought .
Or the underwater mixing patterns (I am sure there is a name for that but don't know it yet).
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08-Jan-2010, 05:26 PM #51
I found this to be extremely interesting:

Tools and Models to stuudy Southern Oceans:

http://www.science.org.au/nova/018/018box02.htm


And check out the Antarctic Circumpolar Current link at the bottom of the page

Last edited by Gabriel; 08-Jan-2010 at 05:32 PM..
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08-Jan-2010, 05:54 PM #52
Interesting articles, Gabriel.....
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08-Jan-2010, 06:05 PM #53
I posted this link several times in the other GW thread, but wasn't sure if anyone looked at it.
It's current wind patters of the world, courtesy of Bing and the Weather channel.

Let the flash animation load, click on 'past'.....let the animation begin, click on 'world' and then 'past' again.

http://www.weather.com/weather/map/i...MapLayer=radar



screen shot:



Notice the difference between air circulation in north and south hemispheres.
Complex to say the least.
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Stoner's Avatar
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08-Jan-2010, 10:20 PM #54
An interesting article at NewScientist about Antarctic melt .

http://www.newscientist.com/article/...ef=online-news

excerpts>
Quote:
Antarctica is warming, but not melting anything like as much as expected. In fact, during the continent's summer this time last year, there was less melting than at any time in the 30 years that we have had reliable satellite measurements of the region.
Quote:
The continent's huge ice sheets contain enough frozen water to raise sea levels globally by around 60 metres. Tedesco and Monaghan say the main factor in how much they warm each summer is the strength of the winds that circle the continent.
Quote:
The circumpolar winds appear to have strengthened because the ozone layer in the stratosphere has thinned. This has made the lower stratosphere cooler and generated stronger winds beneath. But Tedesco warns that as the ozone hole heals in the coming decades, the winds will weaken, the continent will become much warmer in summer and melting will increase.
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08-Jan-2010, 10:40 PM #55
Here's an interesting contradiction to warmer and longer growing seasons creating greater CO2 storage..... with subalpine forests .

http://www.sciencedaily.com/releases...0107183136.htm

Warmer Climate Could Stifle Carbon Uptake by Trees, Study Finds
excerpts>
Quote:
Contrary to conventional belief, as the climate warms and growing seasons lengthen subalpine forests are likely to soak up less carbon dioxide, according to a new University of Colorado at Boulder study
Quote:
Working with ecology and evolutionary biology professor and CIRES Fellow Russell Monson, Hu found that while smaller spring snowpack tended to advance the onset of spring and extend the growing season, it also reduced the amount of water available to forests later in the summer and fall. The water-stressed trees were then less effective in converting CO2 into biomass. Summer rains were unable to make up the difference, Hu said.
About Hu.... http://rintintin.colorado.edu/~huj/Welcome.html
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08-Jan-2010, 10:41 PM #56
Hi Jack
Here is one of the ice shelves (Wilkins), timeline progression of collapse at the National Snow and Ice Data Center. There are links in there to other ice shelf breakups.

http://nsidc.org/news/press/wilkins/
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08-Jan-2010, 10:46 PM #57
Hi Gabriel

Thanks for the link.......I think this thread is going to be quite interesting.
A thanks to Tim for setting it up.
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08-Jan-2010, 11:08 PM #58
Quote:
Originally Posted by Stoner View Post
Here's an interesting contradiction to warmer and longer growing seasons creating greater CO2 storage..... with subalpine forests .

http://www.sciencedaily.com/releases...0107183136.htm

Warmer Climate Could Stifle Carbon Uptake by Trees, Study Finds
excerpts>




About Hu.... http://rintintin.colorado.edu/~huj/Welcome.html
From your link:
Quote:
The researchers found that even as late in the season as September and October, 60 percent of the water in stems and needles collected from subalpine trees along Colorado's Front Range could be traced back to spring snowmelt. They were able to distinguish between spring snow and summer rain in plant matter by analyzing slight variations in hydrogen and oxygen atoms in the water molecules.
Every fiber of my being screams that the bolded statement is {expletive deleted}.

Last edited by pyritechips; 09-Jan-2010 at 02:17 AM.. Reason: Edited out profanity.
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08-Jan-2010, 11:09 PM #59
Quote:
Originally Posted by Stoner View Post

Notice the difference between air circulation in north and south hemispheres.
Complex to say the least.
I am checking that out, and with the info. I have read on the corialis effect, and prevailing wind patterns
Gabriel's Avatar
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08-Jan-2010, 11:11 PM #60
Quote:
Originally Posted by LuckyStrike View Post
From your link:


Every fiber of my being screams that the bolded statement is {expletive deleted}.
Why is that hard to believe?

Last edited by pyritechips; 09-Jan-2010 at 02:22 AM..
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