IMIS | Flanders Marine Institute
 

Flanders Marine Institute

Platform for marine research

IMIS

Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (0): add | show Printer-friendly version

A variable and decreasing sink for atmospheric CO2 in the North Atlantic
Schuster, U.; Watson, A.J. (2007). A variable and decreasing sink for atmospheric CO2 in the North Atlantic. J. Geophys. Res. 112(C11006): C11006. hdl.handle.net/10.1029/2006JC003941
In: Journal of Geophysical Research. American Geophysical Union: Richmond. ISSN 0148-0227, more
Peer reviewed article  

Available in Authors 

Keywords
    Carbon dioxide; Carbon sinks; A, North Atlantic [Marine Regions]; Marine

Authors  Top 
  • Schuster, U.
  • Watson, A.J.

Abstract
    A time series of observations from merchant ships between the U.K. and the Caribbean is used to establish the variability of sea surface pCO2 and air-to-sea flux from the mid-1990s to early 2000s. We show that the sink for atmospheric CO2 exhibits important interannual variability, which is in phase across large regions from year to year. Additionally, there has been an interdecadal decline, evident throughout the study region but especially significant in the northeast of the area covered, with the sink reducing >50% from the mid-1990s to the period 2002-2005. A review of available observations suggests a large region of decrease covering much of the North Atlantic but excluding the western subtropical areas. We estimate that the uptake of the region between 20°N and 65°N declined by ~0.24 Pg C a-1 from 1994/1995 to 2002-2005. Declining rates of wintertime mixing and ventilation between surface and subsurface waters due to increasing stratification, linked to variation in the North Atlantic Oscillation, are suggested as the main cause of the change. These are exacerbated by a contribution from the changing buffer capacity of the ocean water, as the carbon content of surface waters increases.

All data in IMIS is subject to the VLIZ privacy policy Top | Authors