Stable silicon isotopes as a proxy of silicon utilization in the Southern Ocean


Contact
dwolf [ at ] awi-bremerhaven.de

Abstract

Marine diatoms take up silicic acid for the buildup of theiropaline shells and discriminate against the heavier siliconisotopes. Rayleigh distillation in the upper mixed layer duringthe growing season increases the mean isotopic compositionof diatom shells. In principle it should be possible toreconstruct the relative utilization of silicic acid from theisotopic composition of diatom shells archived in sediments.In the real ocean, however, several other factors perturb thissimple picture. The impact of mixing, advection andremineralization on the isotopic composition of silicic acidand diatom shells have been investigated by integration andanalysis of a biogeochemical general circulation model aswell as a conceptual model. We will discuss the applicabilityof silicon isotopes in the Southern Ocean.



Item Type
Conference (Invited talk)
Authors
Divisions
Programs
Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
Invited Talk,EGS - AGU - EUG Joint Assembly, Nice,France, 07 - 11 April 2003..
Eprint ID
8544
Cite as
Wischmeyer, A. G. , De La Rocha, C. , Maier-Reimer, E. and Wolf-Gladrow, D. (2003): Stable silicon isotopes as a proxy of silicon utilization in the Southern Ocean , Invited Talk,EGS - AGU - EUG Joint Assembly, Nice,France, 07 - 11 April 2003. .


Share

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item