The impact of high CO2 and low pH on the organic carbon characterization

The atmospheric concentration of carbon dioxide (CO2) is increasing. Carbon capture and storage (CCS) provides a means to halt emissions. CCS under the seabed has some associated risks, such as seepage of CO2 from the storage site that in turn can cause localized ocean acidification (OA). The OA affects the marine chemistry and the different species of marine dissolved organic carbon (DOC) as well as the DOC transformation of the marine bacteria. These changes could potentially alter the long-term carbon storage capacity of the ocean. The CO2Marine project aimed to study the changes in the marine chemistry and bacterial degradation under high-pressure, long-term, low pH conditions. In this thesis, the intention was to study the effect that the low pH conditions would have on the DOC and the bacterial activity and to characterize the different DOC species with liquid chromatography- mass spectrometry (LC-MS). What we found was a decrease in the concentration of DOC and particulate organic carbon (POC) under low pH stress. The DOC compounds characterized were different between treatments and showed an apparent shift from negatively charged to positively charged. There was a higher bacterial degradation activity after low pH stress however; a decreased amount of recalcitrant DOC (RDOC) was produced. 11 potentially RDOC compounds were identified.

Yunes R. D., 2018. The impact of high CO2 and low pH on the organic carbon characterization. MSc thesis, Norwegian University of Science and Technology, 98 p. Thesis.

0 Responses to “The impact of high CO2 and low pH on the organic carbon characterization”



  1. Leave a Comment

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 )

Google+ photo

You are commenting using your Google+ 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 )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.




Subscribe to the RSS feed

Powered by FeedBurner

Follow AnneMarin on Twitter

Blog Stats

  • 1,122,846 hits

OA-ICC HIGHLIGHTS

Ocean acidification in the IPCC AR5 WG II

OUP book