Carbon excursions

Rocky Rex

There are several examples in the geological record of things called

Carbon excursions’..….

http://essayweb.net/geology/quicknotes/carbonexcursion.shtml

All five of the major Phanerozoic mass extinction events are matched by significant carbon isotopic excursions.

Negative CEs involve lots of gaseous carbon compounds adding to the air, causing warming.

Positive CEs involve the reverse…. processes absorb the gases and cooling follows.

Examples of +ve CEs include…..

‘Snowball Earth’ events.….

http://www.space.com/22501-snowball-earth-ice-ages-history.html

An example of a -ve CE is the PETM.

The Palaeocene-Eocene Thermal Maximum

http://www.whoi.edu/cms/files/higgins06epsl_138364.pdf

See Section 9 ..Conclusions… last sentence.

Ecosystems recovered from the PETM ….. it ‘only’ took 100,000 years.

The earth systems simply react to the chemistry ….. how the gases get into the air is unimportant.

And currently CO2 is rising at 20 ppm per decade.

The ice core record (800,000 years) shows that the fastest rise in CO2 over that time was 20 ppm…..in 1000 years.

http://www.antarctica.ac.uk/bas_research/science_briefings/icecorebriefing.php

Nothing like this has happened in the time of Homo sapiens.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s