R
Ronald L. Siefert
Researcher at United States Naval Academy
Publications - 39
Citations - 3656
Ronald L. Siefert is an academic researcher from United States Naval Academy. The author has contributed to research in topics: Aerosol & Deposition (aerosol physics). The author has an hindex of 23, co-authored 39 publications receiving 3401 citations. Previous affiliations of Ronald L. Siefert include California Institute of Technology & University of Maryland Center for Environmental Science.
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Journal ArticleDOI
Global distribution of atmospheric phosphorus sources, concentrations and deposition rates, and anthropogenic impacts
Natalie M. Mahowald,Tim Jickells,Alex R. Baker,Paulo Artaxo,Claudia R. Benitez-Nelson,Gilles Bergametti,Tami C. Bond,Ying Chen,David D. Cohen,Barak Herut,Nilgun Kubilay,Rémi Losno,Chao Luo,Willy Maenhaut,Kenneth A. McGee,Gregory S. Okin,Ronald L. Siefert,Seigen Tsukuda +17 more
TL;DR: A worldwide compilation of atmospheric total phosphorus (TP) and phosphate (PO4) concentration and deposition flux observations are combined with transport model simulations to derive the global distribution of concentrations and fluxes of TP and PO4.
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Atmospheric Iron Deposition: Global Distribution, Variability, and Human Perturbations*
Natalie M. Mahowald,Sebastian Engelstaedter,Chao Luo,Andrea Sealy,Paulo Artaxo,Claudia R. Benitez-Nelson,Sophie Bonnet,Ying Chen,Patrick Y. Chuang,David D. Cohen,François Dulac,Barak Herut,Anne M. Johansen,Nilgun Kubilay,Rémi Losno,Willy Maenhaut,Adina Paytan,Joseph M. Prospero,Lindsey M. Shank,Ronald L. Siefert +19 more
TL;DR: The results imply that humans could be substantially impacting iron and bioavailable iron deposition to ocean regions, but there are large uncertainties in the authors' understanding.
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Combustion iron distribution and deposition
Chao Luo,Chao Luo,Natalie M. Mahowald,Natalie M. Mahowald,Tami C. Bond,Patrick Y. Chuang,Paulo Artaxo,Ronald L. Siefert,Ying Chen,James J. Schauer +9 more
TL;DR: In this article, the source, transport, and deposition of soluble iron from combustion sources is modeled, and it is shown that combustion iron can represent up to 50% of the total amount of iron deposited in open ocean regions.
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An extensive bloom of the N2-fixing cyanobacterium Trichodesmium erythraeum in the central Arabian Sea
Douglas G. Capone,Ajit Subramaniam,Joseph P. Montoya,Maren Voss,Christoph Humborg,Anne M. Johansen,Ronald L. Siefert,Edward J. Carpenter +7 more
TL;DR: A preliminary extrapolation based on observed, non-bloom rates of N, fixation from limited sampling in the spring intermonsoon suggest N2 fixation may account for an input of about 1 Tg N yr-I, which is substantial, but relatively minor compared to current estimates of the removal of N through denitrification in the basin.
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Estimates of atmospheric-processed soluble iron from observations and a global mineral aerosol model: Biogeochemical implications
Jenny L. Hand,Jenny L. Hand,Natalie M. Mahowald,Natalie M. Mahowald,Yaw-Lin Chen,Ronald L. Siefert,Chao Luo,Ajit Subramaniam,Inez Fung +8 more
TL;DR: In this paper, the authors test two simple hypotheses of soluble iron enhancement in the atmosphere using a global model of mineral aerosols, assuming that iron solubility increases as iron is exposed to solar radiation, approximating photoreduction reactions that are important pathways for enhancement of soluble IR in the presence of acidic solutions.