How fast is the Patagonian shelf-break acidifying?

Last modified: 
November 29, 2017 - 12:10pm
Type: Journal Article
Year of publication: 2017
Date published: 02/2017
Authors: Iole Orselli, Rodrigo Kerr, Rosane Ito, Virginia Tavano, Carlos Mendes, Carlos Garcia
Journal title: Journal of Marine Systems
Volume: 178
Pages: 1 - 14
ISSN: 09247963

Anthropogenic carbon (Cant) concentration is determined according to the TrOCA method, from carbonate system data and hydrographic parameters collected during two consecutive spring cruises (2007 and 2008) in the Argentinean Patagonian shelf-break zone between 36°S and 50°S. Cant has intruded the water column until intermediate depths, with no Cant below 1000 m, in the deeper waters (i.e., North Atlantic Deep Water and Antarctic Bottom Water) of the Northern sector of the study area (i.e., North of 38°S). The higher Cant concentration is observed in Subantarctic Shelf Water in the Southern region, whereas in the Northern sector both Tropical Water and South Atlantic Central Water are equally affected by Cant intrusion. The Antarctic Intermediate Water represents the depth-limit achieved by Cant penetration, reinforcing the role that this water mass plays as an important vehicle to transport Cant to the oceans interior. The estimated Cantaverage (± method precision) is 46.6 ± 5.3 μmol kg− 1, considering the full depth of the water column. The ocean acidification state (ΔpH) shows an average (± standard deviation) of − 0.11 ± 0.05, thus, indicating an annual pH reduction of − 0.0010 yr− 1 since the Industrial Revolution (c.a. 1750). The degree of aragonite saturation is lowered towards undersaturation levels of calcite. The Patagonian shelf and shelf-break zones—a strong CO2 sink region in the global ocean—are likely a key area for Cant intrusion in the southwestern South Atlantic Ocean.

Freely available?: 
No
Approximate cost to purchase or rent this item from the publisher: US $41.95

(Links to preprints and postprints are checked for validity at the time of publication. If this link does not work, please let us know in the comments below. Additionally, you may use the Google Scholar link below to search for alternative freely-available versions of this resource.)

Summary available?: 
No

Report an error or inaccuracy

Notice an error in the Literature item above? Please let us know in the comments section below. Thank you for helping us keep the Literature Library up-to-date!

Add new comment