Right, a feedback and not a forcer, but I'm sure I came across a couple of references, once maybe on the NOAA website, saying it wasn't figured in because it wasn't a forcer and, in fact, you found it under a subheaded link entitled "Limits," i.e. natural limits in the equation built in from a broad view into the study.
I'll see if I can't scare up a link, meanwhile, I was interested in thoughts on gas sinks figuring in but a moment, please to grab the Wikipedia reference...
This is from the wiki carbon sink reference...
http://www.earth.columbia.edu/articles/view/2586
"...Some climate models have already predicted such a slowdown in the oceans’ ability to soak up excess carbon from the atmosphere, but this is the first time scientists have actually measured it. Models attribute the change to depletion of ozone in the stratosphere and global warming-induced shifts in winds and ocean circulation. But the new study suggests the slowdown is due to natural chemical and physical limits on the oceans’ ability to absorb carbon—an idea that is now the subject of widespread research by other scientists..."
Wait, another quote in there before you comment, please...
"...For decades, scientists have tried to estimate the amount of manmade carbon absorbed by the ocean by teasing out the small amount of industrial carbon—less than 1 percent—from the enormous background levels of natural carbon. Because of the difficulties of this approach, only one attempt has been made to come up with a global estimate of how much industrial carbon the oceans held--for a single year, 1994..."
I'm sure you see what I'm getting at, in addition, every place you look akin to this relies on as many "may be's", "could be's" and the like, in the end, truly you can't help but be left with a problematic formula, I should think, at least by any reasonable estimation...
Physics is founded on anything but guesswork and neither, then, should the arithmetic our climate science is rooted in, or it isn't science.
To further qualify the previous remarks, oceans being the largest carbon sink, are a single, tiny element in the grand scheme of mechanisms going into the climate models we're founding all this on, it's all built awful thinly to buy in so readily we ever again consider a US-centric Kyoto Protocol, that's my issue...
Further yet, you can't help but introduce significant cumulative err by sampling from the microcosm in attempt to graft it in as a template for the whole, as they suggest in the above statement and as is widely recognized to be used in other relative methodologies in this all-important field of study.
And it's very irresponsible to condone swans on tea...