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Aquat Geochem 2017 12;23(1):61-74. Epub 2016 Oct 12.

2Department of Earth Science and Engineering, Imperial College London, London, SW7 2AZ UK.

Naturally occurring goethites often show Al for Fe substitution approaching 33 mol% Al. This substitution has potential to influence the rate of goethite dissolution and therefore the supply of bioavailable Fe. Siderophores such as ferrichrome and enterobactin have considerable potential to dissolve Fe from Fe rich minerals, including Al-substituted goethites. Read More

Aquat Geochem 2016 13;22(5):401-417. Epub 2016 May 13.

2National Oceanography Centre, Southampton, UK.

Long time-series studies are critical to assessing impacts of climate change on the marine carbon cycle. A 27-year time-series study in the abyssal northeast Pacific (Sta. M, 4000 m depth) has provided the first concurrent measurements of sinking particulate organic carbon supply (POC flux) and remineralization by the benthic community. Read More

Aquat Geochem 2016 8;22(5):443-467. Epub 2016 Sep 8.

7Water Studies Centre, School of Chemistry, Monash University, Clayton, VIC 3800 Australia.

Based on in situ microprofiles, chamber incubations and eddy covariance measurements, we investigated the benthic carbon mineralization and nutrient regeneration in a ~65-m-deep sedimentation basin of Loch Etive, UK. The sediment hosted a considerable amount of infauna that was dominated by the brittle star . The numerous burrows were intensively irrigated enhancing the benthic in situ O uptake by ~50 %, and inducing highly variable redox conditions and O distribution in the surface sediment as also documented by complementary laboratory-based planar optode measurements. Read More

Aquat Geochem 2012;18:297-326. Epub 2012 Apr 27.

School of Natural Sciences, University of California, 5200 North Lake Rd, Merced, CA 95343 USA.

A 1-D biogeochemical reactive transport model with a full set of equilibrium and kinetic biogeochemical reactions was developed to simulate the fate and transport of arsenic and mercury in subaqueous sediment caps. Model simulations (50 years) were performed for freshwater and estuarine scenarios with an anaerobic porewater and either a diffusion-only or a diffusion plus 0.1-m/year upward advective flux through the cap. Read More