CO2 news from the AGU

AGU Day 2: The role of CO2 in the earth’s history | Serendipity

This is a good, lengthy summary of a talk given at the current American Geophysical Union conference on the important role of CO2 in prehistory.

There is also a very noteworthy report of a talk given by the people who run AIRS, an infrared instrument, on NASA's Aqua satellite.

Here are some key parts:

researchers told reporters that AIRS, containing no moving parts, has proved remarkably robust, measuring carbon dioxide, ozone, water vapor, and carbon monoxide in the mid-troposphere, five to 12 km above Earth’s surface, with far greater precision than anticipated prior to launch in 2002.

In particular, said Moustafa Chahine of NASA’s Jet Propulsion Laboratory, “AIRS provides the highest accuracy and yield of any global carbon dioxide data set available to the scientific community.” Seven years of these data were made available to researchers worldwide in conjunction with the AGU meeting. NASA said it was the first ever release of daily CO2 data based solely on observations.

AIRS researchers have learned over the past seven years that CO2 does not mix well in the troposphere, but is what Chahine called “lumpy,” concentrated more in some places than in others, driven by the jet stream. AIRS has tracked the dispersion of CO2 from Indonesian forest fires, which accounts for a staggering 20% of global anthropogenic CO2. Where does it go? Along with the northern hemisphere’s other CO2 emissions, much of it winds up over the southern hemisphere, according to AIRS measurements, as reported here....

Bloody hell! How hard can it be to devise a way to stop Indonesians from burning so much forest?

This part is important:

Another member of the AIRS team, Andrew Dessler of Texas A&M University, reported on the unique view the instrument is providing of water vapor distribution in the atmosphere, and in particular the feedback of water vapor that he says amplifies warming due to CO2. He warned that warming of a few degrees Celsius is “essentially guaranteed” over the next century, unless there exists a “presently unknown offsetting feedback (e.g., clouds).”

Dessler took issue with a statement, attributed to Lowell Wood, in the recently published book, Superfreakonomics, that current climate models “do not know how to handle water vapor and various types of clouds….I hope we’ll have good numbers on water vapor by 2020 or thereabouts.” Dessler told reporters that AIRS, using the infrared spectrum, sees right through clouds and is providing accurate water vapor data today. Current models do a good job of simulating the water vapor feedback effect, he said.