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Browsing Marine Chemistry and Geochemistry (MC&G) by Title

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Browsing Marine Chemistry and Geochemistry (MC&G) by Title

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  • Buesseler, Ken O.; Andrews, J. E.; Pike, Steven M.; Charette, Matthew A.; Goldson, Laura E.; Brzezinski, Mark A.; Lance, V. P. (2004-07-26)
    We studied the effect of iron addition on particle export in the Southern Ocean by measuring changes in the distribution of thorium-234 during a 4 week Fe enrichment experiment conducted in the high-silicate high-nitrate ...
  • Buesseler, Ken O.; Lamborg, Carl H.; Cai, Pinghe; Escoube, Raphaelle; Johnson, Rodney J.; Pike, Steven M.; Masque, Pere; McGillicuddy, Dennis J.; Verdeny, E. (2007-09-25)
    We examined the impact of a cyclonic eddy and mode-water eddy on particle flux in the Sargasso Sea. The primary method used to quantify flux was based upon measurements of the natural radionuclide, 234Th, and these flux ...
  • Schofield, Oscar M. E.; Ducklow, Hugh W.; Bernard, Kim; Doney, Scott C.; Patterson-Fraser, Donna; Gorman, Kristen; Martinson, Douglas G.; Meredith, Michael P.; Saba, Grace; Stammerjohn, Sharon E.; Steinberg, Deborah K.; Fraser, William R. (The Oceanography Society, 2013-09)
    The West Antarctic Peninsula (WAP) is home to large breeding colonies of the ice-dependent Antarctic Adélie penguin (Pygoscelis adeliae). Although the entire inner continental shelf is highly productive, with abundant ...
  • Zhu, Wenlu; Tivey, Margaret K.; Gittings, Hilary; Craddock, Paul R. (American Geophysical Union, 2007-05-12)
    Systematic laboratory measurements of permeability and porosity were conducted on three large vent structures from the Mothra Hydrothermal vent field on the Endeavor segment of the Juan de Fuca Ridge. Geometric means of ...
  • Spiteri, Claudette; Regnier, P.; Slomp, Caroline P.; Charette, Matthew A. (2005-08-19)
    Iron-oxide coated sediment particles in subterranean estuaries can act as a geochemical barrier (“iron curtain”) for various chemical species in groundwater (e.g. phosphate), thus limiting their discharge to coastal waters. ...
  • Moutin, T.; Karl, David M.; Duhamel, S.; Rimmelin, P.; Raimbault, P.; Van Mooy, Benjamin A. S.; Claustre, H. (Copernicus Publications on behalf of the European Geosciences Union, 2008-01-29)
    Due to the low atmospheric input of phosphate into the open ocean, it is one of the key nutrients that could ultimately control primary production and carbon export into the deep ocean. The observed trend over the last 20 ...
  • Oates, Roger Hunter (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2008-06)
    Biogeochemical cycling of phosphate is a key component in the overall production rate of coastal ecosystems. Mineral phases in the near-shore sediments play a significant role in the return of phosphate remineralized in ...
  • Van Mooy, Benjamin A. S.; Moutin, T.; Duhamel, S.; Rimmelin, P.; Van Wambeke, F. (Copernicus Publications on behalf of the European Geosciences Union, 2008-02-06)
    Membrane lipid molecules are a major component of planktonic organisms and this is particularly true of the microbial picoplankton that dominate the open ocean; with their high surface-area to volume ratios, the synthesis ...
  • Benitez-Nelson, Claudia R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-09)
    Knowledge of temporal and spatial nutrient turnover and export rates is of great importance for a variety of investigations, ranging from nutrient limitation to contamination uptake and removal. However, there are few ...
  • Martin, Patrick; Van Mooy, Benjamin A. S.; Heithoff, Abigail; Dyhrman, Sonya T. (2010-11)
    In low phosphorus (P) marine systems phytoplankton replace membrane phospholipids with non-phosphorus lipids, but it is not known how rapidly this substitution occurs. Here, when cells of the model diatom Thalassiosira ...
  • Herbelin, Sarah E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1994-08)
    The work presented here consists of a literature review and calculations to estimate the importance of photochemistry to carbon cycling in the oceans, followed by a photophysical study of a series of stable nitroxide ...
  • Hashioka, T.; Vogt, M.; Yamanaka, Yasuhiro; Le Quere, C.; Buitenhuis, Erik T.; Aita, M. N.; Alvain, S.; Bopp, Laurent; Hirata, T.; Lima, Ivan D.; Sailley, Sevrine F.; Doney, Scott C. (Copernicus Publications on behalf of the European Geosciences Union, 2013-11-02)
    We investigated the mechanisms of phytoplankton competition during the spring bloom, one of the most dramatic seasonal events in lower-trophic-level ecosystems, in four state-of-the-art plankton functional type (PFT) models: ...
  • Dai, Minhan; Buesseler, Ken O.; Pike, Steven M. (2004-01-27)
    We examined the concentration, size distribution, redox state and isotopic composition of plutonium (Pu) in groundwater at the 100K-Area at the US Department of Energy’s (DOE) Hanford Site. Total concentrations of Pu ...
  • Buesseler, Ken O. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1986-09)
    The artificial radionuclide Plutonium (Pu) has been introduced into the environment primarily as fallout from atmospheric nuclear weapons testing during the 1950's and 1960's. Earlier studies of Pu geochemistry are ...
  • Bernhard, Joan M.; Casciotti, Karen L.; McIlvin, Matthew R.; Beaudoin, David J.; Visscher, Pieter T.; Edgcomb, Virginia P. (American Geophysical Union, 2012-07-03)
    Until recently, the process of denitrification (conversion of nitrate or nitrite to gaseous products) was thought to be performed exclusively by prokaryotes and fungi. The finding that foraminifera perform complete ...
  • Bertrand, Sebastien; Hughen, Konrad A.; Lamy, Frank; Stuut, Jan-Berend W.; Torrejon, Fernando; Lange, Carina B. (Copernicus Publications on behalf of the European Geosciences Union, 2012-03-15)
    Glaciers are frequently used as indicators of climate change. However, the link between past glacier fluctuations and climate variability is still highly debated. Here, we investigate the mid- to late-Holocene fluctuations ...
  • Miller, C. E.; Crisp, D.; DeCola, P. L.; Olsen, S. C.; Randerson, James T.; Michalak, A. M.; Alkhaled, A.; Rayner, Peter; Jacob, D. J.; Suntharalingam, P.; Jones, D. B. A.; Denning, A. S.; Nicholls, M. E.; Doney, Scott C.; Pawson, S.; Boesch, H.; Connor, B. J.; Fung, Inez Y.; O'Brien, D.; Salawitch, R. J.; Sander, S. P.; Sen, B.; Tans, Pieter P.; Toon, G. C.; Wennberg, Paul O.; Wofsy, Steven C.; Yung, Y. L.; Law, R. M. (American Geophysical Union, 2007-05-26)
    Precision requirements are determined for space-based column-averaged CO2 dry air mole fraction (XCO2) data. These requirements result from an assessment of spatial and temporal gradients in XCO2, the relationship between ...
  • Lupker, Maarten; France-Lanord, Christian; Galy, Valier; Lave, Jerome; Gaillardet, Jerome; Gajurel, Ananta Prasad; Guilmette, Caroline; Rahman, Mustafizur; Singh, Sunil Kumar; Sinha, Rajiv (2011-12-01)
    We present an extensive river sediment dataset covering the Ganga basin from the Himalayan front downstream to the Ganga mainstream in Bangladesh. These sediments were mainly collected over several monsoon seasons and ...
  • Scholten, Jan C.; Pham, Mai Khanh; Blinova, Oxana; Charette, Matthew A.; Dulaiova, Henrieta; Eriksson, Mats (2010-04)
    Precise measurements of the short lived radium isotopes 223Ra and 224Ra by means of the delayed coincidence counting system (RaDeCC) rely on an efficiency calibration of this system using Mn-fiber standards for which ...
  • Dufernez, Fabienne; Yernaux, Cedric; Gerbod, Delphine; Noel, Christophe; Chauvenet, Melanie; Wintjens, Rene; Edgcomb, Virginia P.; Capron, Monique; Opperdoes, Fred R.; Viscogliosi, Eric (2005-08-11)
    Metalloenzymes such as the superoxide dismutases (SODs) form part of a defense mechanism that helps protect obligate and facultative aerobic organisms from oxygen toxicity and damage. Here, we report the presence in the ...

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