Browsing Earth and Environmental Sciences by Author "Van Cappellen, P."
Now showing items 1-15 of 15
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Atmospheric acidification of mineral aerosols: a source of bioavailable phosphorus for the oceans
Nenes, Athanasios; Krom, Michael D.; Mihalopoulos, Nikos; Van Cappellen, Philippe; Shi, Zongbo; Bougiatioti, Aikaterini; Zarmpas, Pavlos; Herut, Barak (European Geosciences Union, 2011-07-01)Primary productivity of continental and marine ecosystems is often limited or co-limited by phosphorus. Deposition of atmospheric aerosols provides the major external source of phosphorus to marine surface waters. However, ... -
Bioretention cells under cold climate conditions: Effects of freezing and thawing on water infiltration, soil structure, and nutrient removal
Ding, Brenden; Rezanezhad, Fereidoun; Gharedaghloo, Behrad; Van Cappellen, Philippe; Passeport, Elodie (Elsevier, 2019-02-01)Bioretention cells are a popular control strategy for stormwater volume and quality, but their efficiency for water infiltration and nutrient removal under cold climate conditions has been poorly studied. In this work, ... -
Circulation and oxygen cycling in the Mediterranean Sea: Sensitivity to future climate change
Powley, Helen; Krom, Michael D.; Van Cappellen, Philippe (American Geophysical Union, 2016-11-12)Climate change is expected to increase temperatures and decrease precipitation in the Mediterranean Sea (MS) basin, causing substantial changes in the thermohaline circulation (THC) of both the Western Mediterranean Sea ... -
A diagnostic approach to constraining flow partitioning in hydrologic models using a multiobjective optimization framework
Shafii, Mahyar; Basu, Nandita; Craig, James R.; Schiff, Sherry L.; Van Cappellen, Philippe (American Geophysical Union, 2017-04-21)Hydrologic models are often tasked with replicating historical hydrographs but may do so without accurately reproducing the internal hydrological functioning of the watershed, including the flow partitioning, which is ... -
Dissolved inorganic carbon and alkalinity fluxes from coastal marine sediments: model estimates for different shelf environments and sensitivity to global change
Krumins, V.; Gehlen, M.; Arndt, S.; Van Cappellen, Philippe; Regnier, Pierre (European Geosciences Union, 2013-01-24)We present a one-dimensional reactive transport model to estimate benthic fluxes of dissolved inorganic carbon (DIC) and alkalinity (AT) from coastal marine sediments. The model incorporates the transport processes of ... -
Fate of Adsorbed U(VI) during Sulfidization of Lepidocrocite and Hematite
Alexandratos, Vasso G.; Behrends, Thilo; Van Cappellen, Philippe (American Chemical Society, 2017-02-21)The impact on U(VI) adsorbed to lepidocrocite (gamma-FeOOH) and hematite (alpha-Fe2O3) was assessed when exposed to aqueous sulfide (S(II)(aq)) at pH 8.0. With both minerals, competition between S(-II) and U(VI) for surface ... -
Gibbs Energy Dynamic Yield Method (GEDYM): Predicting microbial growth yields under energy-limiting conditions
Smeaton, Christina M.; Van Cappellen, Philippe (Elsevier, 2018-11-15)Biomass-explicit biogeochemical models assign microbial growth yields (Y) using values measured in the laboratory or predicted using thermodynamics-based methods. However, Y values are rarely measured under the low energy ... -
Iron Isotope Fractionations Reveal a Finite Bioavailable Fe Pool for Structural Fe(III) Reduction in Nontronite
Shi, Bingjie; Liu, Kai; Wu, Lingling; Li, Weiqiang; Smeaton, Christina M.; Beard, Brian L.; Johnson, Clark M.; Roden, Eric E.; Van Cappellen, Philippe (American Chemical Society, 2017-08-16)We report on stable Fe isotope fractionation during microbial and chemical reduction of structural Fe(III) in nontronite NAu-1. Fe-56/Fe-54 fractionation factors between aqueous Fe(II) and structural Fe(III) ranged from ... -
Plastic debris in the Laurentian Great Lakes: A review
Driedger, Alexander G. J.; Dürr, Hans H.; Mitchell, Kristen; Van Cappellen, Philippe (Elsevier, 2015-03-01)Pollution by plastic debris is an increasing environmental concern in the Laurentian Great Lakes where it affects open-water, shoreline, and benthic environments. Open-water surveys reveal that in certain areas of the Great ... -
Ra-228, Ra-226, Ra-224 and Ra-223 in potential sources and sinks of land-derived material in the German Bight of the North Sea: implications for the use of radium as a tracer
Schmidt, Caroline; Hanfland, Claudia; Regnier, Pierre; Van Cappellen, Philippe; Schlüter, Michael; Knauthe, Ulrich; Stimac, Ingrid; Geibert, Walter (Springer, 2011-08-01)Activities of the naturally occurring radium nuclides Ra-228, Ra-226, Ra-224 and Ra-223 were determined in waters of the open German Bight and adjacent nearshore areas in the North Sea, in order to explore the potential ... -
Speciation dynamics of oxyanion contaminants (As, Sb, Cr) in argillaceous suspensions during oxic-anoxic cycles
Markelova, Ekaterina; Couture, Raoul-Marie; Parsons, Christopher T.; Markelov, Igor; Madé, Benoit; Van Cappellen, Philippe; Charlet, Laurent (Elsevier, 2018-04-01)Argillaceous geological formations are considered promising repositories for waste containing inorganic contaminants. However, the sequestration capacity of an argillaceous natural barrier may change as a result of dynamic ... -
Structure of peat soils and implications for water storage, flow and solute transport: A review update for geochemists
Rezanezhad, Fereidoun; Price, Jonathan S.; Quinton, William L.; Lennartz, Bernd; Milojevic, Tatjana; Van Cappellen, Philippe (Elsevier, 2016-07-01)Global peatlands are a valuable but vulnerable resource. They represent a significant carbon and energy reservoir and play major roles in water and biogeochemical cycles. Peat soils are highly complex porous media with ... -
Transport of chloride and deuterated water in peat: The role of anion exclusion, diffusion, and anion adsorption in a dual porosity organic media
McCarter, Colin; Rezanezhad, Fereidoun; Gharedaghloo, Behrad; Price, Jonathan S.; Van Cappellen, P. (Elsevier, 2019-08)The dual-porosity structure of peat and the extremely high organic matter content give rise to a complex medium that typically generates prolonged tailing and early 50% concentration breakthrough in the breakthrough curves ... -
Two centuries of nitrogen dynamics: Legacy sources and sinks in the Mississippi and Susquehanna River Basins
Van Meter, Kimberly; Basu, Nandidta; Van Cappellen, Philippe (American Geophysical Union, 2017-01-07)Global flows of reactive nitrogen (N) have increased significantly over the last century in response to agricultural intensification and elevated levels of atmospheric deposition. Despite widespread implementation conservation ... -
Worldwide retention of nutrient silicon by river damming: From sparse data set to global estimate
Maavara, Taylor; Dürr, Hans H.; Van Cappellen, Philippe (American Geophysical Union, 2014-08-13)Damming of rivers represents a major anthropogenic perturbation of the hydrological cycle, with the potential to profoundly modify the availability of nutrient silicon (Si) in streams, lakes, and coastal areas. A global ...