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| Carbonate chemistry, carbon cycle and climate change | |
| www.awi.de/en/research/research_divisions/biosciences/projects/c6/ | |
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Acroniem: 6C Periode: November 2002 tot Oktober 2006 Status: Afgelopen |
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| Instituten (6) | Top |
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| Abstract |
| Problems to be solved
The mechanism(s) responsible for lower atmospheric pCO2 during the Last Glacial Maximum (LGM) and possible feedbacks with climate change are still unresolved. Without a properly implemented natural relationship between the global carbon cycle and climate change, model predictions of future climate scenarios due to anthropogenic CO2 release are doomed to fail. Abstract Among the most important challenges remaining to be addressed by Quaternary paleoceanographers is the mechanism responsible for lowering pCO2 during the Last Glacial Maximum (LGM) and possible feedback mechanisms with climate change. Our main objective is to use a multi-proxy approach in order to reconstruct the oceanic carbonate chemistry over the past 130,000 years. In combination with numerical models this will allow us to 1) distinguish the mechanisms that control the operation of the oceanic carbon cycle, 2) identify water masses as sinks or sources of atmospheric CO2 and hence, 3) better constrain the role and the impact of the carbon cycle on climate oscillations. Knowledge of the nature and amplitude of natural fluctuations in the past are a precondition to assess the stability of modern subsystems and their potential range of variations in the future. Objectives The overall objective of 6C is to hind-cast the processes that control the natural inter-relationship between the variation in atmospheric pCO2 and climate change on glacial-interglacial (G-IG) time scales (by reconstructing temporal and spatial changes in the ocean carbonate chemistry) and to quantify and predict changes in atmospheric pCO2 on anthropogenic time scales (by quantifying the negative feed-back of pelagic calcifiers). |
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