<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Assmann, K. M.</style></author><author><style face="normal" font="default" size="100%">Bentsen, Mats</style></author><author><style face="normal" font="default" size="100%">Segschneider, J.</style></author><author><style face="normal" font="default" size="100%">Heinze, C.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">An isopycnic ocean carbon cycle model</style></title><secondary-title><style face="normal" font="default" size="100%">Geoscientific Model Development</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2010</style></year><pub-dates><date><style  face="normal" font="default" size="100%">16/02/2010</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">www.geosci-model-dev.net/3/143/2010/</style></url></web-urls><related-urls><url><style face="normal" font="default" size="100%">http://www.nersc.no/sites/www.nersc.no/files/An isopycnic ocean carbon cycle model.pdf</style></url></related-urls></urls><publisher><style face="normal" font="default" size="100%">Copernicus Publications on behalf of the European Geosciences Union</style></publisher><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The carbon cycle is a major forcing component in the global climate system. Modelling studies, aiming to ex- plain recent and past climatic changes and to project future ones, increasingly include the interaction between the phys- ical and biogeochemical systems. Their ocean components are generally z-coordinate models that are conceptually easy to use but that employ a vertical coordinate that is alien to the real ocean structure. Here, we present first results from a newly-developed isopycnic carbon cycle model and demon- strate the viability of using an isopycnic physical component for this purpose. As expected, the model represents well the interior ocean transport of biogeochemical tracers and pro- duces realistic tracer distributions. Difficulties in employing a purely isopycnic coordinate lie mainly in the treatment of the surface boundary layer which is often represented by a bulk mixed layer. The most significant adjustments of the ocean biogeochemistry model HAMOCC, for use with an isopycnic coordinate, were in the representation of upper ocean biological production. We present a series of sensi- tivity studies exploring the effect of changes in biogeochem- ical and physical processes on export production and nutrient distribution. Apart from giving us pointers for further model development, they highlight the importance of preformed nu- trient distributions in the Southern Ocean for global nutrient distributions. The sensitivity studies show that iron limitation for biological particle production, the treatment of light pen- etration for biological production, and the role of diapycnal mixing result in significant changes of nutrient distributions and liniting factors of biological production.</style></abstract><auth-address><style face="normal" font="default" size="100%">NERSC</style></auth-address></record></records></xml>