Reference : Glacial-interglacial changes in continental weathering: possible implications for atmosp...
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Glacial-interglacial changes in continental weathering: possible implications for atmospheric CO2
Munhoven, Guy mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) - Pétrologie, géochimie endogènes et pétrophysique >]
François, Louis mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Modélisation du climat et des cycles biogéochimiques >]
Carbon Cycling in the Glacial Ocean: Constraints on the Ocean's Role in Global Change
Zahn, Rainer
Pedersen, Thomas F.
Kaminski, Michael A.
Labeyrie, Laurent
NATO ASI Series, Vol. I 17
Berlin, Heidelberg
[en] Silicate weathering ; Glacial-interglacial ; Atmospheric carbon dioxide ; Strontium isotopes
[en] An eleven-box model of the ocean-atmosphere subsystem of the global carbon cycle is developed to study the potential contribution of continental rock weathering and oceanic sedimentation to the variations of the atmospheric CO2 pressure over glacial-interglacial timescales. The model is capable of reproducing the distribution of total dissolved inorganic carbon, total alkalinity, phosphate, delta C-13, and Delta C-14 between the various ocean basins today, as well as the partial pressure of atmospheric CO2. A simple sedimentation scheme at 20 different depth levels drives carbonate deposition and dissolution as a function of the depths of carbonate and aragonite lysoclines in each ocean basins considered (Atlantic, Antarctic and Indo-Pacific).
The coral-reef erosion-deposition cycle is also taken into account. Furthermore, a simple cycle of oceanic strontium isotopes has been added to this model to take advantage of the Sr-87/Sr-86 data recently published by Dia et al. [1992] for the last 300,000 years. These data emphasize the importance of weathering of continental silicate rocks at glacial-interglacial timescales. They are used to construct several scenarios of changes of continental weathering over the last glacial cycles. They suggest that the flux of alkalinity delivered to the ocean from continental silicate weathering may have been substantially larger during glacial times than today. We show that such variations of continental weathering may explain at least in part the observed changes of the partial pressure of atmospheric CO2 between glacial and interglacial periods.
Commission européenne : Direction générale de la Recherche ; Services Fédéraux des Affaires Scientifiques, Techniques et Culturelles - SSTC ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
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