Re: [asa] CO2 content

Aparently the Azolla link is at

http://www.hgs.org/attachments/calendarevents/838/Bujak%20Azolla%20Talk%20(c
ompressed).ppt

jb

On 8/26/08, Rich Blinne <rich.blinne@gmail.com> wrote:
> On Tue, Aug 26, 2008 at 3:19 PM, David Campbell
> <pleuronaia@gmail.com>wrote:
>
>>
>> (Note: I have not gone back to the Azolla presentation to check the
>> claims
>> about how much CO2 was sequestered, etc. I definitely wouldn't want to
>> assert that abundant Azolla is enough to cause a significant decrease in
>> CO2. My point is just that "warming causes lots of Azolla" is way too
>> simplistic.)
>>
>>
>
>
> Slide 171 says:
>
> Slide 171*did Azolla really change the Earth from
> a supergreenhouse to icehouse state?*
>
> The implication is that Azolla sequestered 3000 ppm of CO2! This was based
> on exactly TWO measurements with an error rate of 30-40%. Furthermore,
> slide
> 114 has this alleged CO2 drop being the same time as the so-called Azolla
> event when they were 3 million years apart. In fact, this slide about the
> Azolla event is utterly breathtaking in its claims and deserves to be
> quoted
> in full:
>
> Slide 114*base Middle Eocene* [RDB Note: Long-term warming is observed into
> the early Eocene (54.8–49.0 Ma), with peak SST between 51 and 48 Ma and
> rapid cooling of 4°C beginning at 48 Ma. Thus, any claims of of being
> coeval
> needs to line up with 48 mya.]
>
> * lasted about 800,000 years*
>
> * coeval with onset of Arctic cooling* [RDB Note: I'll give a pass here as
> this was a cooling event. That being said, glaciation in the Northern
> Hemisphere began much later, between 10 and 6 million years ago.]
>
> *coeval with onset of Antarctic glaciation* [RDB Note: Oops. Antaractic
> glaciation happened 34 Ma.]
>
> *coeval with massive fall in CO2 *[RDB Note: Oops. The two data points
> happened 51 Ma + 1.3 myr - 0.2 myr]
>
> Rich Blinne
> Member ASA
>

-- 
Burgy
www.burgy.50megs.com
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