Now showing items 389-408 of 802

  • An interlaboratory study of TEX86 and BIT analysis of sediments, extracts, and standard mixtures 

    Schouten, Stefan; Hopmans, Ellen C.; Rosell-Mele, Antoni; Pearson, Ann; Adam, Pierre; Bauersachs, Thorsten; Bard, Edouard; Bernasconi, Stefano M.; Bianchi, Thomas S.; Brocks, Jochen J.; Carlson, Laura Truxal; Castaneda, Isla S.; Derenne, Sylvie; Selver, Ayca Dogrul; Dutta, Koushik; Eglinton, Timothy I.; Fosse, Celine; Galy, Valier; Grice, Kliti; Hinrichs, Kai-Uwe; Huang, Yongsong; Huguet, Arnaud; Huguet, Carme; Hurley, Sarah; Ingalls, Anitra; Jia, Guodong; Keely, Brendan; Knappy, Chris; Kondo, Miyuki; Krishnan, Srinath; Lincoln, Sara; Lipp, Julius; Mangelsdorf, Kai; Martínez-Garcia, Alfredo; Menot, Guillemette; Mets, Anchelique; Mollenhauer, Gesine; Ohkouchi, Naohiko; Ossebaar, Jort; Pagani, Mark; Pancost, Richard D.; Pearson, Emma J.; Peterse, Francien; Reichart, Gert-Jan; Schaeffer, Philippe; Schmitt, Gaby; Schwark, Lorenz; Shah, Sunita R.; Smith, Richard W.; Smittenberg, Rienk H.; Summons, Roger E.; Takano, Yoshinori; Talbot, Helen M.; Taylor, Kyle W. R.; Tarozo, Rafael; Uchida, Masao; van Dongen, Bart E.; Van Mooy, Benjamin A. S.; Wang, Jinxiang; Warren, Courtney; Weijers, Johan W. H.; Werne, Josef P.; Woltering, Martijn; Xie, Shucheng; Yamamoto, Masanobu; Yang, Huan; Zhang, Chuanlun L.; Zhang, Yige; Zhao, Meixun; Sinninghe Damste, Jaap S. (John Wiley & Sons, 2013-12-20)
    Two commonly used proxies based on the distribution of glycerol dialkyl glycerol tetraethers (GDGTs) are the TEX86 (TetraEther indeX of 86 carbon atoms) paleothermometer for sea surface temperature reconstructions and the ...
  • An interlaboratory study of TEX86 and BIT analysis using high-performance liquid chromatography–mass spectrometry 

    Schouten, Stefan; Hopmans, Ellen C.; van der Meer, Jaap; Mets, Anchelique; Bard, Edouard; Bianchi, Thomas S.; Diefendorf, Aaron; Escala, Marina; Freeman, Katharine H.; Furukawa, Yoshihiro; Huguet, Carme; Ingalls, Anitra; Menot-Combes, Guillemette; Nederbragt, Alexandra J.; Oba, Masahiro; Pearson, Ann; Pearson, Emma J.; Rosell-Mele, Antoni; Schaeffer, Philippe; Shah, Sunita R.; Shanahan, Timothy M.; Smith, Richard W.; Smittenberg, Rienk; Talbot, Helen M.; Uchida, Masao; Van Mooy, Benjamin A. S.; Yamamoto, Masanobu; Zhang, Zhaohui; Sinninghe Damste, Jaap S. (American Geophysical Union, 2009-03-20)
    Recently, two new proxies based on the distribution of glycerol dialkyl glycerol tetraethers (GDGTs) were proposed, i.e., the TEX86 proxy for sea surface temperature reconstructions and the BIT index for reconstructing ...
  • Introduction to “Understanding the Ocean's biological pump : results from VERTIGO” 

    Buesseler, Ken O.; Lampitt, Richard S. (2008-04-04)
    Unknown and unexplained aspects of the human condition were the focus of a television series in the USA created by Rod Serling in the early 1960s. The term “The Twilight Zone” used in his show is even more pertinent to ...
  • Inverse estimates of anthropogenic CO2 uptake, transport, and storage by the ocean 

    Mikaloff Fletcher, Sara E.; Gruber, Nicolas; Jacobson, Andrew R.; Doney, Scott C.; Dutkiewicz, Stephanie; Gerber, Markus; Follows, Michael J.; Joos, Fortunat; Lindsay, Keith; Menemenlis, Dimitris; Mouchet, Anne; Muller, Simon A.; Sarmiento, Jorge L. (American Geophysical Union, 2006-04-05)
    Regional air-sea fluxes of anthropogenic CO2 are estimated using a Green's function inversion method that combines data-based estimates of anthropogenic CO2 in the ocean with information about ocean transport and mixing ...
  • Inverse estimates of the oceanic sources and sinks of natural CO2 and the implied oceanic carbon transport 

    Mikaloff Fletcher, Sara E.; Gruber, Nicolas; Jacobson, Andrew R.; Gloor, Emanuel; Doney, Scott C.; Dutkiewicz, Stephanie; Gerber, Markus; Follows, Michael J.; Joos, Fortunat; Lindsay, Keith; Menemenlis, Dimitris; Mouchet, Anne; Muller, Simon A.; Sarmiento, Jorge L. (American Geophysical Union, 2007-02-10)
    We use an inverse method to estimate the global-scale pattern of the air-sea flux of natural CO2, i.e., the component of the CO2 flux due to the natural carbon cycle that already existed in preindustrial times, on the basis ...
  • Inverse kinetic isotope fractionation during bacterial nitrite oxidation 

    Casciotti, Karen L. (2008-12-29)
    Natural abundance stable isotopes in nitrate (NO3-), nitrite (NO2-), and nitrous oxide (N2O) have been used to better understand the cycling of nitrogen in marine and terrestrial environments. However, in order to extract ...
  • An inverse relationship between production and export efficiency in the Southern Ocean 

    Maiti, Kanchan; Charette, Matthew A.; Buesseler, Ken O.; Kahru, Mati (John Wiley & Sons, 2013-04-23)
    In the past two decades, a number of studies have been carried out in the Southern Ocean to look at export production using drifting sediment traps and thorium-234 based measurements, which allows us to reexamine the ...
  • Investigation of extractable organic compounds in deep-sea hydrothermal vent fluids along the Mid-Atlantic Ridge 

    McCollom, Thomas M.; Seewald, Jeffrey S.; German, Christopher R. (2015-01)
    The possibility that deep-sea hydrothermal vents may contain organic compounds produced by abiotic synthesis or by microbial communities living deep beneath the surface has led to numerous studies of the organic composition ...
  • Investigations of air-sea gas exchange in the CoOP Coastal Air-Sea Chemical Exchange project 

    Edson, James B.; DeGrandpre, Michael D.; Frew, Nelson M.; McGillis, Wade R. (Oceanography Society, 2008-12)
    The exchange of CO2 and other gases across the ocean-air interface is an extremely important component in global climate dynamics, photosynthesis and respiration, and the absorption of anthropogenically produced CO2. The ...
  • IOC contributions to international, interdisciplinary open data sharing 

    Glover, David M.; Wiebe, Peter H.; Chandler, Cynthia L.; Levitus, Sydney (Oceanography Society, 2010-09)
    Over the last 50 years, the Intergovernmental Oceanographic Commission (IOC) has had a profound influence upon the willingness of United Nations Member States to share and provide access to their international and ...
  • Iron and Prochlorococcus 

    Thompson, Anne Williford (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2009-06)
    Iron availability and primary productivity in the oceans are intricately linked through photosynthesis. At the global scale we understand how iron addition induces phytoplankton blooms through meso-scale iron-addition ...
  • Iron availability limits the ocean nitrogen inventory stabilizing feedbacks between marine denitrification and nitrogen fixation 

    Moore, J. Keith; Doney, Scott C. (American Geophysical Union, 2007-04-04)
    Recent upward revisions in key sink/source terms for fixed nitrogen (N) in the oceans imply a short residence time and strong negative feedbacks involving denitrification and N fixation to prevent large swings in the ocean ...
  • The iron budget in ocean surface waters in the 20th and 21st centuries : projections by the Community Earth System Model version 1 

    Misumi, Kazuhiro; Lindsay, Keith; Moore, J. Keith; Doney, Scott C.; Bryan, Frank O.; Tsumune, Daisuke; Yoshida, Yoshikatsu (Copernicus Publications on behalf of the European Geosciences Union, 2014-01-04)
    We investigated the simulated iron budget in ocean surface waters in the 1990s and 2090s using the Community Earth System Model version 1 and the Representative Concentration Pathway 8.5 future CO2 emission scenario. We ...
  • Iron isotope fractionation in subterranean estuaries 

    Rouxel, Olivier J.; Sholkovitz, Edward R.; Charette, Matthew A.; Edwards, Katrina J. (2008-04-25)
    Dissolved Fe concentrations in subterranean estuaries, like their river-seawater counterparts, are strongly controlled by non-conservative behavior during mixing of groundwater and seawater in coastal aquifers. Previous ...
  • Iron isotope systematics in estuaries : the case of North River, Massachusetts (USA) 

    Escoube, Raphaelle; Rouxel, Olivier J.; Sholkovitz, Edward R.; Donard, Olivier F. X. (2009-04)
    Recent studies have suggested that rivers may present an isotopically light Fe source to the oceans. Since the input of dissolved iron from river water is generally controlled by flocculation processes that occur during ...
  • Iron limitation of a springtime bacterial and phytoplankton community in the Ross Sea : implications for vitamin B12 nutrition 

    Bertrand, Erin M.; Saito, Mak A.; Lee, Peter A.; Dunbar, Robert B.; Sedwick, Peter N.; DiTullio, Giacomo R. (Frontiers Media, 2011-08-15)
    The Ross Sea is home to some of the largest phytoplankton blooms in the Southern Ocean. Primary production in this system has previously been shown to be iron limited in the summer and periodically iron and vitamin B12 ...
  • Iron stress in open-ocean cyanobacteria (Synechococcus, Trichodesmium, and Crocosphaera spp.) : identification of the IdiA protein 

    Webb, Eric A.; Moffett, James W.; Waterbury, John B. (American Society for Microbiology, 2001-12)
    Cyanobacteria are prominent constituents of the marine biosphere that account for a significant percentage of oceanic primary productivity. In an effort to resolve how open-ocean cyanobacteria persist in regions where the ...
  • Isolation and characterization of novel psychrophilic, neutrophilic, Fe-oxidizing, chemolithoautotrophic α- and γ-proteobacteria from the deep sea 

    Edwards, Katrina J.; Rogers, Daniel R.; Wirsen, Carl O.; McCollom, Thomas M. (American Society for Microbiology, 2003-05)
    We report the isolation and physiological characterization of novel, psychrophilic, iron-oxidizing bacteria (FeOB) from low-temperature weathering habitats in the vicinity of the Juan de Fuca deep-sea hydrothermal area. ...
  • Isotope tracing of submarine groundwater discharge offshore Ubatuba, Brazil : results of the IAEA–UNESCO SGD project 

    Povinec, Pavel P.; Bokuniewicz, H. J.; Burnett, William C.; Cable, J.; Charette, Matthew A.; Comanducci, J.-F.; Konta, E. A.; Moore, Willard S.; Oberdorfer, J. A.; de Oliveira, J.; Peterson, R.; Stieglitz, T.; Taniguchi, M. (2008-06-12)
    Results of groundwater and seawater analyses for radioactive (3H, 222Rn, 223Ra, 224Ra, 226Ra, 228Ra) and stable (2H, 18O) isotopes are presented together with in situ spatial mapping and time-series 222Rn measurements in ...
  • Isotopic constraints on the sources and associations of organic compounds in marine sediments 

    White, Helen K. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-02)
    To provide a new perspective on the fate of both natural organic matter and hydrophobic organic contaminants (HOCs) in marine sediments, we have investigated the relationship between radiocarbon (14C) age and the different ...