A new view of iron cycling in intertidal mudflats: Two-dimensional mapping of iron and phosphorus release at submillimeter scale

Aubin Thibault de Chanvalon, Edouard Metzger, A Mouret, Florian Cesbron, J. Knoery, P Launeau, E Geslin, Sebastiaan Van De Velde, Filip Meysman

Research output: Chapter in Book/Report/Conference proceedingMeeting abstract (Book)

Abstract

Sediment diagenesis generates solute fluxes across the
sediment-water interface which can strongly impact biogeochemistry of the overlying the water column. The reductive dissolution of iron (hydr)oxides is an important diagenetic process for the top 20 cm of sediment in the Loire estuary, and probably supplies dissolved phosphate and trace metals to the river. High-resolution two-dimension determination of dissolved phosphorus and iron in porewater by a combined DET-gel/colorimetry technique (200 μm x 200 μm) shows a high vertical and lateral heterogeneity in the surface sediment. Based on the Savitzky Golay filter approach, an original 2D numeric
model suitably calculate the first order derivative (providing the flux) and the second order derivative (providing the production rate) of the measured 2D
concentration. The subsequent sampling of the adjacent reactive solid phase at a resolution of 10mm allows to estimate the standing stock. The resulting 2D patterns of stocks and productions highlight in an unprecedented way the importance of bioirrigation and labile organic carbon patchiness on iron cycling and phosphorus mobilization in estuarine sediment and intertidal mudflats.
These research was part of RS2E project founded by Région Pays de la Loire.
Original languageEnglish
Title of host publicationGoldschmidt2015
Publication statusPublished - 2015
EventGoldschmidt 2015 - Prague, Czech Republic
Duration: 16 Aug 201521 Aug 2015

Conference

ConferenceGoldschmidt 2015
Country/TerritoryCzech Republic
CityPrague
Period16/08/1521/08/15

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