Now showing items 310-329 of 838

  • Geochemistry of slow-growing corals : reconstructing sea surface temperature, salinity and the North Atlantic Oscillation 

    Goodkin, Nathalie F. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2007-06)
    A 225-year old coral from the south shore of Bermuda (64°W, 32°N) provides a record of decadal-to-centennial scale climate variability. The coral was collected live, and sub-annual density bands seen in x-radiographs ...
  • Geochemistry of surface sediments from the fjords of Northern Chilean Patagonia (44–47°S) : spatial variability and implications for paleoclimate reconstructions 

    Bertrand, Sebastien; Hughen, Konrad A.; Sepulveda, Julio; Pantoja, Silvio (2011-09-22)
    The Patagonian fjords have a clear potential to provide high-resolution sedimentary and geochemical records of past climate and environmental change in the Southern Andes. To improve our ability to interpret these proxy ...
  • Geology, geochemistry and earthquake history of Lṑihi Seamount, Hawaìi's youngest volcano 

    Garcia, Michael O.; Caplan-Auerbach, Jackie; De Carlo, Eric H.; Kurz, Mark D.; Becker, N. (2005-09-20)
    A half century of investigations are summarized here on the youngest Hawaiian volcano, Lō`ihi Seamount. It was discovered in 1952 following an earthquake swarm. Surveying in 1954 determined it has an elongate shape, which ...
  • Geomicrobiology of nitrogen in a coastal aquifer : isotopic and molecular methods to examine nitrification and denitrification in groundwater 

    Rogers, Daniel R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-06)
    Excess nitrogen input is deleterious to coastal waters, resulting in deterioration of the water quality, increases in harmful algal blooms and disease in commercial fish stocks. A significant portion of this nitrogen ...
  • Geomicrobiology of the ocean crust : the phylogenetic diversity, abundance, and distribution of microbial communities inhabiting basalt and implications for rock alteration processes 

    Santelli, Cara M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2007-06)
    Basaltic ocean crust has the potential to host one of the largest endolithic communities on Earth. This portion of the biosphere, however, remains largely unexplored. In this study, we utilize molecular biological, ...
  • GEOTRACES IC1 (BATS) contamination-prone trace element isotopes Cd, Fe, Pb, Zn, Cu, and Mo intercalibration 

    Boyle, Edward A.; John, Seth G.; Abouchami, Wafa; Adkins, Jess F.; Echegoyen-Sanz, Yolanda; Ellwood, Michael J.; Flegal, A. Russell; Fornace, Kyrstin L.; Gallon, Celine; Galer, Steve; Gault-Ringold, Melanie; Lacan, Francois; Radic, Amandine; Rehkamper, Mark; Rouxel, Olivier J.; Sohrin, Yoshiki; Stirling, Claudine H.; Thompson, Claire; Vance, Derek; Xue, Zichen; Zhao, Ye (Association for the Sciences of Limnology and Oceanography, 2012-09)
    We report data on the isotopic composition of cadmium, copper, iron, lead, zinc, and molybdenum at the GEOTRACES IC1 BATS Atlantic intercalibration station. In general, the between lab and within-lab precisions are adequate ...
  • GEOTRACES intercalibration of 230Th, 232Th, 231Pa, and prospects for 10Be 

    Anderson, Robert F.; Fleisher, Martin Q.; Robinson, Laura F.; Edwards, R. Lawrence; Hoff, John A.; Moran, S. Bradley; Rutgers van der Loeff, Michiel M.; Thomas, Alexander L.; Roy-Barman, Matthieu; Francois, Roger (Association for the Sciences of Limnology and Oceanography, 2012-04)
    Nineteen labs representing nine nations participated in the GEOTRACES intercalibration initiative that determined concentrations of 232Th, 230Th, 231Pa, or 10Be in seawater, suspended particles or sediments. Results generally ...
  • GEOTRACES radium isotopes interlaboratory comparison experiment 

    Charette, Matthew A.; Dulaiova, Henrieta; Gonneea, Meagan E.; Henderson, Paul B.; Moore, Willard S.; Scholten, Jan C.; Pham, Mai Khanh (Association for the Sciences of Limnology and Oceanography, 2012-06)
    In anticipation of the international GEOTRACES program, which will study the global marine biogeochemistry of trace elements and isotopes, we conducted a multi-lab intercomparison for radium isotopes. The intercomparison ...
  • Glacial influence on the geochemistry of riverine iron fluxes to the Gulf of Alaska and effects of deglaciation 

    Schroth, Andrew W.; Crusius, John; Chever, Fanny; Bostick, Benjamin C.; Rouxel, Olivier J. (American Geophysical Union, 2011-08-25)
    Riverine iron (Fe) derived from glacial weathering is a critical micronutrient source to ecosystems of the Gulf of Alaska (GoA). Here we demonstrate that the source and chemical nature of riverine Fe input to the GoA could ...
  • Glacial-interglacial modulation of the marine nitrogen cycle by high-latitude O2 supply to the global thermocline 

    Galbraith, Eric D.; Kienast, Markus; Pedersen, Thomas F.; Calvert, Stephen E. (American Geophysical Union, 2004-10-16)
    An analysis of sedimentary nitrogen isotope records compiled from widely distributed marine environments emphasizes the global synchrony of denitrification changes and provides evidence for a strong temporal coupling of ...
  • Global assessment of ocean carbon export by combining satellite observations and food-web models 

    Siegel, David A.; Buesseler, Ken O.; Doney, Scott C.; Sailley, Sevrine F.; Behrenfeld, Michael J.; Boyd, Philip W. (John Wiley & Sons, 2014-03-10)
    The export of organic carbon from the surface ocean by sinking particles is an important, yet highly uncertain, component of the global carbon cycle. Here we introduce a mechanistic assessment of the global ocean carbon ...
  • Global carbon budget 2013 

    Le Quere, Corinne; Peters, G. P.; Andres, R. J.; Andrew, R. M.; Boden, T. A.; Ciais, Philippe; Friedlingstein, Pierre; Houghton, Richard A.; Marland, G.; Moriarty, R.; Sitch, Stephen; Tans, Pieter P.; Arneth, Almut; Arvanitis, A.; Bakker, Dorothee C. E.; Bopp, Laurent; Canadell, Josep G.; Chini, L. P.; Doney, Scott C.; Harper, A.; Harris, I.; House, J. I.; Jain, Atul K.; Jones, S. D.; Kato, E.; Keeling, R. F.; Klein Goldewijk, K.; Kortzinger, A.; Koven, C.; Lefevre, N.; Maignan, F.; Omar, A.; Ono, T.; Park, Geun-Ha; Pfeil, Benjamin; Poulter, Benjamin; Raupach, M. R.; Regnier, P.; Rodenbeck, C.; Saito, S.; Schwinger, J.; Segschneider, J.; Stocker, B. D.; Takahashi, Taro; Tilbrook, Bronte; van Heuven, Steven; Viovy, N.; Wanninkhof, Rik; Wiltshire, A.; Zaehle, Sonke (Copernicus Publications., 2014-06-17)
    Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere is important to better understand the global carbon cycle, support the ...
  • Global carbon budget 2014 

    Le Quere, Corinne; Moriarty, R.; Andrew, R. M.; Peters, G. P.; Ciais, Philippe; Friedlingstein, Pierre; Jones, S. D.; Sitch, Stephen; Tans, Pieter P.; Arneth, Almut; Boden, T. A.; Bopp, Laurent; Bozec, Yann; Canadell, Josep G.; Chini, L. P.; Chevallier, F.; Cosca, C. E.; Harris, I.; Hoppema, Mario; Houghton, Richard A.; House, J. I.; Jain, Atul K.; Johannessen, T.; Kato, E.; Keeling, R. F.; Kitidis, V.; Klein Goldewijk, K.; Koven, C.; Landa, C. S.; Landschutzer, P.; Lenton, A.; Lima, Ivan D.; Marland, G.; Mathis, Jeremy T.; Metzl, Nicolas; Nojiri, Yukihiro; Olsen, A.; Ono, T.; Peng, S.; Peters, W.; Pfeil, Benjamin; Poulter, Benjamin; Raupach, M. R.; Regnier, P.; Rodenbeck, C.; Saito, S.; Salisbury, Joseph E.; Schuster, Ute; Schwinger, J.; Seferian, Roland; Segschneider, J.; Steinhoff, T.; Stocker, B. D.; Sutton, A. J.; Takahashi, Taro; Tilbrook, Bronte; van der Werf, Guido R.; Viovy, N.; Wang, Y.-P.; Wanninkhof, Rik; Wiltshire, A.; Zeng, Ning (Copernicus Publications, 2015-05-08)
    Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere is important to better understand the global carbon cycle, support the ...
  • Global estimate of submarine groundwater discharge based on an observationally constrained radium isotope model 

    Kwon, Eun Young; Kim, Guebuem; Primeau, Francois W.; Moore, Willard S.; Cho, Hyung-Mi; DeVries, Timothy; Sarmiento, Jorge L.; Charette, Matthew A.; Cho, Yang-Ki (John Wiley & Sons, 2014-12-03)
    Along the continental margins, rivers and submarine groundwater supply nutrients, trace elements, and radionuclides to the coastal ocean, supporting coastal ecosystems and, increasingly, causing harmful algal blooms and ...
  • Global ocean carbon uptake : magnitude, variability and trends 

    Wanninkhof, Rik; Park, Geun-Ha; Takahashi, Taro; Sweeney, Colm; Feely, Richard A.; Nojiri, Yukihiro; Gruber, Nicolas; Doney, Scott C.; McKinley, Galen A.; Lenton, A.; Le Quere, Corinne; Heinze, Christoph; Schwinger, J.; Graven, Heather; Khatiwala, Samar (Copernicus Publications on behalf of the European Geosciences Union, 2013-03-22)
    The globally integrated sea–air anthropogenic carbon dioxide (CO2) flux from 1990 to 2009 is determined from models and data-based approaches as part of the Regional Carbon Cycle Assessment and Processes (RECCAP) project. ...
  • Global oceanic emission of ammonia : constraints from seawater and atmospheric observations 

    Paulot, Fabien; Jacob, Daniel J.; Johnson, Martin T.; Bell, Tom G.; Baker, Alexander R.; Keene, William C.; Lima, Ivan D.; Doney, Scott C.; Stock, Charles A. (John Wiley & Sons, 2015-08-13)
    Current global inventories of ammonia emissions identify the ocean as the largest natural source. This source depends on seawater pH, temperature, and the concentration of total seawater ammonia (NHx(sw)), which reflects ...
  • Global temperature calibration of the alkenone unsaturation index (UK′37) in surface waters and comparison with surface sediments 

    Conte, Maureen H.; Sicre, Marie-Alexandrine; Ruhlemann, Carsten; Weber, John C.; Schulte, Sonja; Schulz-Bull, Detlef; Blanz, Thomas (American Geophysical Union, 2006-02-07)
    In this paper, we compile the current surface seawater C37 alkenone unsaturation (UK′37) measurements (n=629, −1 to 30°C temperature range) to derive a global, field-based calibration of UK′37 with alkenone production ...
  • Globally elevated titanium, tantalum, and niobium (TITAN) in ocean island basalts with high 3He/4He 

    Jackson, Matthew G.; Hart, Stanley R.; Saal, Alberto E.; Shimizu, Nobumichi; Kurz, Mark D.; Blusztajn, Jerzy S.; Skovgaard, Anna C. (American Geophysical Union, 2008-04-17)
    We report evidence for a global Ti, Ta, and Nb (TITAN) enriched reservoir sampled by ocean island basalts (OIBs) with high 3He/4He ratios, an isotopic signature associated with the deep mantle. Excesses of Ti (and to a ...
  • Gradients in dimethylsulfide, dimethylsulfoniopropionate, dimethylsulfoxide, and bacteria near the sea surface 

    Zemmelink, Hendrik J.; Houghton, Leah; Sievert, Stefan M.; Frew, Nelson M.; Dacey, John W. H. (Inter-Research, 2005-06-23)
    Gradients of dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP), dimethylsulfoxide (DMSO), and bacterial numbers and diversity from the surface microlayer to 500 cm depth were assessed in coastal waters surrounding ...
  • Gradients in intact polar diacylglycerolipids across the Mediterranean Sea are related to phosphate availability 

    Popendorf, Kimberly J.; Tanaka, T.; Pujo-Pay, M.; Lagaria, A.; Courties, C.; Conan, P.; Oriol, L.; Sofen, L. E.; Moutin, T.; Van Mooy, Benjamin A. S. (Copernicus Publications on behalf of the European Geosciences Union, 2011-12-20)
    Intact polar membrane lipids compose a significant fraction of cellular material in plankton and their synthesis imposes a substantial constraint on planktonic nutrient requirements. As a part of the Biogeochemistry from ...