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Atmospheric Data

Do you agree that atmospheric CO2 concentrations have "risen steadily"?

Somebody recently claimed that "The point they are missing is that even though we have added exponentially more [CO2 emissions], [the atmospheric CO2 concentration] has risen steadily."

http://answers.yahoo.com/question/index?qid=20090409141216AAyC5Hf&r=w&show_comments=true&pa=FZB6NWHjDG3N56z6v_2wXVvZ6C4YzA.el1zVKHHobRk6iXpJi.sXrQ6g4xwOqSfQ4QaxP5iylELwViag8wZ87Q--&paid=add_comment#openions

If we actually look at the data, in the 1960s atmospheric CO2 was increasing at a rate of 0.9 ppm per year. In the 1970s, it increased 1.3 ppm per year. In the 1980s and '90s, 1.5 ppm per year. In the '00s, 2.1 ppm per year.
ftp://ftp.cmdl.noaa.gov/ccg/co2/trends/co2_gr_mlo.txt

Do you agree that this is a steady increase? Who's "missing the point" here?
Will - I agree. You know who else aren't experts? The TV weathermen and economists and the like who make up your "650 experts" list.

That's okay jim, I made the spreadsheet for you, using the data from Dana's link.

Here it is:

Blue line is the actual data points, the black line is the trend line with a positive slope, equation y = 0.0261x - 50.302. (You can hit the magnifying glass to make the image bigger)

Since a "linear" trend must by definition have the slope of its derivative be 0, this is proof positive that the increase is not linear.

But even for the pre-calc educated folks, it should be obvious enough that a graph that looks like this is not 'linear'

http://www.sightedmoon.com/wp-content/uploads/2006/09/Atmospheric%20Concentrations%20of%20Carbon%20Dioxide%201000-2004.JPG

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Climate Change 2of12: Atmospheric Carbon Dioxide Data



Do man-made global warming 'skeptics' believe humans haven't increased atmospheric CO2?

We've already had several 'skeptics' on YA claim that the greenhouse effect doesn't exist.

Recently in another question, a 'skeptic' claimed that "man has nothing to do with the tiny wee bit of extra CO2 in the atmosphere, and is powerless to change it." Of course, this ignores the scientific evidence proving otherwise:

http://www.realclimate.org/index.php?p=87

And to be fair, I know most 'skeptics' accept the basic physics of the greenhouse effect. Do most 'skeptics' also accept the observational data proving that humans have increased the atmospheric CO2 concentration ~37% since the Industrial Revolution?

No.

Edit:
Last of the moh... said
"Mankind has literally doubled the amount of CO2 in the atmosphere."

Please explain.

"We know CO2 is a powerful greenhouse gas"

Do we? Compared to what?

To evans below me:

I would be careful about attacking the idea that CO2 has increased. Mauna Loa measurements agree with hundreds of other reporting stations around the world, including satellites. And they agree fairly well with various proxy studies.

Davem said:
"We have increased the atmospheric CO2 level by an estimated 58,000 ppm"

Oh dave, it's people like you that really give skeptics a bad name. I do not appreciate it.

Crazy conservative said:
"Final point, as CO2m is added, it has a diminishing return on it's ability to absorb heat. This means that eventually, we can add all the CO2 we want and it will have no ability to increase temps."

First part basically correct, second part incorrect.

Eric C said:
"But I am highly sceptical that co2 will act as a positive feedback"

In this case, CO2 isn't a feedback. But even if it was, I don't know why you would be skeptical of the idea that it would be positive.

Tim said:
"I believe we've increased co2 by 100 ppm. That's what I've read. Not a lot of co2 to be raising the temperature of the globe. 100 extra parts? Out of 1,000,000? Seems like an insignificant contributor to me."

Considering CO2 accounts for roughly 10% of the overall greenhouse effect , a 37% increase in concentration should cause warming. Exactly how much it has and will has not been shown conclusively (or remotely close to conclusively).

Come on skeptics, if you are going to argue, at least get the basics right.

Tags: atmospheric data, atmospheric data analysis, atmospheric data assimilation, atmospheric data center, atmospheric data centre, climate, data, noaa, science, weather

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