EGU General Assembly 2008
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  Information - CL33 Production, flux and burial of silica, and the regulation of global (paleo)cycles

Event Information
The silica cycle is intimately linked to the carbon cycle and thus has a profound impact on climate (past, modern and future). Siliceous microorganisms produced in the water column as well as microfossils preserved in underlying sediments have been intensely used in the last two decades to document variations in the trophic web, the dynamics of the silica cycle, but also paleoclimatic changes. We propose here an interdisciplinary session (1) to bring together a range of presentations covering the use of biogenic silica (opal) and silica-producing organisms for the reconstruction of environmental and climatic conditions from both, freshwater and marine systems, and (2) to discuss recent advances and challenges of opal-based proxies. The session will bring together the diverse and sometimes non-interconscious scientific communities involved including chemical and biological oceanographers, ecologists, taxonomists, micropaleontologists and paleoclimatologists. Session themes will focus on a set of issues related to (i) technological advancements in biogenic silica research, (ii) production of siliceous organisms, including aspects related with biomineralization and genetics; (iii) mechanisms and controls of Si export,(iv) factors controlling preservation and burial of Si, (v) variations of productivity, meltwater pulses, sea-ice coverage, temperature, salinity, pH, and nutrient utilization, and (vi) major geological and evolutionary changes in the silica cycle and its component.

Preliminary List of Solicited Speakers


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