Updated on June 3, 2003
Scientific objectives and approach:
The main scientific objectives of project ORFOIS are to:
- identify and quantify globally the mechanisms underlying the transformation
of biogenic particles to dissolved substances within the ocean water column
in order to predict correctly surface ocean carbon dioxide sources and sinks;
- develop a refined particle flux model for operational use in ocean general
circulation models which realistically describes particle dynamics in the
water column, deposition of material to the sediment, and the interaction
with the carbon dioxide partial pressure pCO2;
- provide a global closed carbon and nutrient budget for modern (preindustrial)
conditions including the water column sediment interaction;
- estimate the changes in CO2 sea surface source sink patterns
and vertical redistributions of carbon as well as nutrients for future global
change, climate change as well as carbon sequestration scenarios including
the associated potential economic impacts.
The project's main technological objectives are to:
The methodology to achieve these goals is based on a combination of a comprehensive
observational data base on marine carbon cycling to be collated with two BOGCMs.
- establish publically available community models for particle flux dynamics
in the water column and early sediment diagenesis which are suited for use
in general circulation ocean climate models;
- establish data bases for marine carbon and nutrient cycling which will be
easily publically available.
The project will result in best estimates of sea surface CO2 source
sink patterns. Comprehensive observational data bases on surface ocean pCO2
and marine carbon cycle data will be collated and made publically available through
web access. Community models on marine particle flux dynamics and early diagenesis
(top sediment zone) will be made publically available for use in any other ocean
model. Estimates of socio-economic impacts of a better knowledge of sea surface
CO2 source sink patterns and particle flux dynamics will be provided
for future climate change as well as carbon sequestration scenarios.