Climate Change Reducing Ocean's Carbon Dioxide Uptake, New Analysis Shows

Discussion in 'Environment' started by Matthew, Jul 11, 2011.

  1. Matthew
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    Matthew Blue dog all the way!

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    Climate Change Reducing Ocean's Carbon Dioxide Uptake, New Analysis Shows



    As one of the planet's largest single carbon absorbers, the ocean takes up roughly one-third of all human carbon emissions, reducing atmospheric carbon dioxide and its associated global changes.

    But whether the ocean can continue mopping up human-produced carbon at the same rate is still up in the air. Previous studies on the topic have yielded conflicting results, says University of Wisconsin-Madison assistant professor Galen McKinley.

    In a new analysis published online July 10 in Nature Geoscience, McKinley and her colleagues identify a likely source of many of those inconsistencies and provide some of the first observational evidence that climate change is negatively impacting the ocean carbon sink.

    "The ocean is taking up less carbon because of the warming caused by the carbon in the atmosphere," says McKinley, an assistant professor of atmospheric and oceanic sciences and a member of the Center for Climatic Research in the Nelson Institute for Environmental Studies.

    The analysis differs from previous studies in its scope across both time and space. One of the biggest challenges in asking how climate is affecting the ocean is simply a lack of data, McKinley says, with available information clustered along shipping lanes and other areas where scientists can take advantage of existing boat traffic. With a dearth of other sampling sites, many studies have simply extrapolated trends from limited areas to broader swaths of the ocean.

    McKinley and colleagues at UW-Madison, the Lamont-Doherty Earth Observatory at Columbia University, and the Universite Pierre et Marie Curie in Paris expanded their analysis by combining existing data from a range of years (1981-2009), methodologies, and locations spanning most of the North Atlantic into a single time series for each of three large regions called gyres, defined by distinct physical and biological characteristics.

    They found a high degree of natural variability that often masked longer-term patterns of change and could explain why previous conclusions have disagreed. They discovered that apparent trends in ocean carbon uptake are highly dependent on exactly when and where you look -- on the 10- to 15-year time scale, even overlapping time intervals sometimes suggested opposite effects.

    "Because the ocean is so variable, we need at least 25 years' worth of data to really see the effect of carbon accumulation in the atmosphere," she says. "This is a big issue in many branches of climate science -- what is natural variability, and what is climate change?"

    Working with nearly three decades of data, the researchers were able to cut through the variability and identify underlying trends in the surface CO2 throughout the North Atlantic.

    During the past three decades, increases in atmospheric carbon dioxide have largely been matched by corresponding increases in dissolved carbon dioxide in the seawater. The gases equilibrate across the air-water interface, influenced by how much carbon is in the atmosphere and the ocean and how much carbon dioxide the water is able to hold as determined by its water chemistry.

    But the researchers found that rising temperatures are slowing the carbon absorption across a large portion of the subtropical North Atlantic. Warmer water cannot hold as much carbon dioxide, so the ocean's carbon capacity is decreasing as it warms.

    In watching for effects of increasing atmospheric carbon on the ocean's uptake, many people have looked for indications that the carbon content of the ocean is rising faster than that of the atmosphere, McKinley says. However, their new results show that the ocean sink could be weakening even without that visible sign.

    "More likely what we're going to see is that the ocean will keep its equilibration but it doesn't have to take up as much carbon to do it because it's getting warmer at the same time," she says. "We are already seeing this in the North Atlantic subtropical gyre, and this is some of the first evidence for climate damping the ocean's ability to take up carbon from the atmosphere."

    She stresses the need to improve available datasets and expand this type of analysis to other oceans, which are relatively less-studied than the North Atlantic, to continue to refine carbon uptake trends in different ocean regions. This information will be critical for decision-making, since any decrease in ocean uptake may require greater human efforts to control carbon dioxide levels in the atmosphere.

    McKinley's work on the project was supported by the National Aeronautics and Space Administration.

    http://www.sciencedaily.com/releases/2011/07/110710132816.htm

    This could be a natural cycle---We don't know enough!
     
  2. CrusaderFrank
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    CrusaderFrank Diamond Member

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    That's just not science; that's solidly between phrenology and palmistry
     
  3. Matthew
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    Matthew Blue dog all the way!

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    Yeah---it leaves a lot of room to move around with what they're saying. Could be natural.
     
  4. westwall
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    westwall USMB Mod Staff Member Gold Supporting Member Supporting Member

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    Oh gosh...where to begin...just a poorly written story all the way around. I hope the actual paper is not written so poorly.
     
  5. waltky
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    waltky Wise ol' monkey Supporting Member

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    Granny says, "Dat's right - carbon gonna build up inna atmosphere till there ain't no air to breathe, den we all gonna die...
    :eek:
    Study: Ocean Less Able to Mitigate Climate Change
    July 12, 2011 - Capacity to take up the carbon humans put in the atmosphere is waning

     
  6. konradv
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    konradv Gold Member

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    What would you know about what is and isn't science?!?! :lol::lol::lol:
     
  7. Oddball
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    Oddball BANNED Supporting Member

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    IOW, they just made shit up to fit their desired outcome.

    Maybe they could get Miss Cleo to review their stuff, to give them a little credibility.
     
  8. CrusaderFrank
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    CrusaderFrank Diamond Member

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    I know because its months now and you still haven't dared to post your "Manmade CO2 is melting the Ice Caps" hypothesis.

    That's how I know
     
  9. konradv
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    konradv Gold Member

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    You're a liar. Been done repeatedly. :eusa_liar:
     
  10. gslack
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    gslack Senior Member

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    Now hold on a second, just recently you algorians claimed that CO2 saturating the oceans are making them more acidic. Remember, the whole more co2 absorbed by the oceans means oceans turn more and more acidic until it kills all the coral and shelled sea life...

    Yeah, so now its just not gonna absorb anymore. If thats the case then the oceans aren't gonna turn into acid pools after all.... LOL you people are so eager to end the world you can't even settle on a method...:lol:
     
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