Joint Seminar: Decadal variations in the global ocean carbon sink estimated from surface ocean pCO2 observations

This study focuses on the variations of the ocean CO2 sink during the past three decades using global surface ocean maps of the partial pressure of CO2 reconstructed from observations contained in the Surface Ocean CO2 Atlas Version 2. To create these maps for the period from 1982 through 2011, the neural network-based data-interpolation method of  Landschützer et al. [2014] is employed. The air-sea flux is then estimated from the difference in partial pressure of CO2 between the ocean and the atmosphere as well as a bulk paramtrization of the kinematik gas transfer. The results suggest strong decadal variations in the global ocean carbon sink, with a minimum uptake of -0.8+-0.5 PgC/yr in 2000, and a substantial strengthening towards more than -2.0+-0.5 PgC/yr in 2010, around a long-term increase that corresponds roughly to that expected from the rise in atmospheric CO2. These decadal variations originate mostly from the extratropical oceans while the tropical regions contribute primarily to interannual variations.These decadal variations lead to a substantially smaller cumulative anthropogenic CO2 uptake of the ocean over the 1982 through 2011 period (reduction of 7.5+-5.5 PgC) relative to that derived by the Global Carbon Project.

Date

20.07.2016

Time

13:30 h

Place

Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg

Speaker

Peter Landschuetzer, Max Planck Institute for Meteorology, Hamburg, Germany

Chair

Chao Li

Back to listing