Now showing items 514-533 of 769

  • Observed 20th century desert dust variability : impact on climate and biogeochemistry 

    Mahowald, Natalie M.; Kloster, S.; Engelstaedter, S.; Moore, J. Keith; Mukhopadhyay, S.; McConnell, Joseph R.; Albani, S.; Doney, Scott C.; Bhattacharya, A.; Curran, M. A. J.; Flanner, M. G.; Hoffman, Forrest M.; Lawrence, David M.; Lindsay, Keith; Mayewski, P. A.; Neff, Jason C.; Rothenberg, D.; Thomas, E.; Thornton, Peter E.; Zender, Charles S. (Copernicus Publications on behalf of the European Geosciences Union, 2010-11-19)
    Desert dust perturbs climate by directly and indirectly interacting with incoming solar and outgoing long wave radiation, thereby changing precipitation and temperature, in addition to modifying ocean and land biogeochemistry. ...
  • Ocean acidification : a critical emerging problem for the ocean sciences 

    Doney, Scott C.; Balch, William M.; Fabry, Victoria J.; Feely, Richard A. (Oceanography Society, 2009-12)
    Over a period of less than a decade, ocean acidification—the change in seawater chemistry due to rising atmospheric carbon dioxide (CO2) levels and subsequent impacts on marine life—has become one of the most critical ...
  • Ocean acidification : present conditions and future changes in a high-CO2 world 

    Feely, Richard A.; Doney, Scott C.; Cooley, Sarah R. (Oceanography Society, 2009-12)
    The uptake of anthropogenic CO2 by the global ocean induces fundamental changes in seawater chemistry that could have dramatic impacts on biological ecosystems in the upper ocean. Estimates based on the Intergovernmental ...
  • Ocean acidification’s potential to alter global marine ecosystem services 

    Cooley, Sarah R.; Kite-Powell, Hauke L.; Doney, Scott C. (Oceanography Society, 2009-12)
    Ocean acidification lowers the oceanic saturation states of carbonate minerals and decreases the calcification rates of some marine organisms that provide a range of ecosystem services such as wild fishery and aquaculture ...
  • Ocean chlorofluorocarbon and heat uptake during the twentieth century in the CCSM3 

    Gent, Peter R.; Bryan, Frank O.; Danabasoglu, Gokhan; Lindsay, Keith; Tsumune, Daisuke; Hecht, Matthew W.; Doney, Scott C. (American Meteorological Society, 2006-06-01)
    An ensemble of nine simulations for the climate of the twentieth century has been run using the Community Climate System Model version 3 (CCSM3). Three of these runs also simulate the uptake of chlorofluorocarbon-11 (CFC-11) ...
  • Oceanic heterotrophic bacterial nutrition by semilabile DOM as revealed by data assimilative modeling 

    Luo, Ya-Wei; Friedrichs, Marjorie A. M.; Doney, Scott C.; Church, Matthew J.; Ducklow, Hugh W. (Inter-Research, 2010-08-03)
    Previous studies have focused on the role of labile dissolved organic matter (DOM) (defined as turnover time of ~1 d) in supporting heterotrophic bacterial production, but have mostly neglected semilabile DOM (defined as ...
  • Oceanic sources, sinks, and transport of atmospheric CO2 

    Gruber, Nicolas; Gloor, Emanuel; Mikaloff Fletcher, Sara E.; Doney, Scott C.; Dutkiewicz, Stephanie; Follows, Michael J.; Gerber, Markus; Jacobson, Andrew R.; Joos, Fortunat; Lindsay, Keith; Menemenlis, Dimitris; Mouchet, Anne; Muller, Simon A.; Sarmiento, Jorge L.; Takahashi, Taro (American Geophysical Union, 2009-02-18)
    We synthesize estimates of the contemporary net air-sea CO2 flux on the basis of an inversion of interior ocean carbon observations using a suite of 10 ocean general circulation models (Mikaloff Fletcher et al., 2006, ...
  • Oceanography : oxygen and climate dynamics 

    Doney, Scott C.; Karnauskas, Kristopher B. (Nature Publishing Group, 2014-09)
    Low oxygen levels in tropical oceans shape marine ecosystems and biogeochemistry with climate change expected to expand these regions. Now, a study indicates that regional dynamics control trop ...
  • Oceanography : plankton in a warmer world 

    Doney, Scott C. (2006-12)
    Satellite data show that phytoplankton biomass and growth generally decline as the oceans’ surface waters warm up. Is this trend, seen over the past decade, a harbinger of the future for marine ecosystems?
  • Oligotyping reveals community level habitat selection within the genus Vibrio 

    Schmidt, Victor T.; Reveillaud, Julie; Zettler, Erik R.; Mincer, Tracy J.; Murphy, Leslie G.; Amaral-Zettler, Linda A. (Frontiers Media, 2014-11-13)
    The genus Vibrio is a metabolically diverse group of facultative anaerobic bacteria, common in aquatic environments and marine hosts. The genus contains several species of importance to human health and aquaculture, including ...
  • On the detection of summertime terrestrial photosynthetic variability from its atmospheric signature 

    Bonfils, Celine; Fung, Inez Y.; Doney, Scott C.; John, Jasmin (American Geophysical Union, 2004-05-11)
    We identify the climatic signatures of the summertime terrestrial photosynthesis variability using a long simulation of pre-industrial climate performed with the NCAR coupled global climate-carbon model. Since plant ...
  • On the fractional solubility of copper in marine aerosols : toxicity of aeolian copper revisited 

    Sholkovitz, Edward R.; Sedwick, Peter N.; Church, Thomas M. (American Geophysical Union, 2010-10-19)
    Paytan et al. (2009) argue that the atmospheric deposition of aerosols lead to copper concentrations that are potentially toxic to marine phytoplankton in a large area of tropical and subtropical North Atlantic Ocean. A ...
  • On the proportion of ballast versus non-ballast associated carbon export in the surface ocean 

    Le Moigne, Frederic A. C.; Sanders, Richard J.; Villa-Alfageme, Maria; Martin, Adrian P.; Pabortsava, Katsiaryna; Planquette, Helene; Morris, Paul J.; Thomalla, Sandy J. (American Geophysical Union, 2012-08-11)
    The role of biominerals in driving carbon export from the surface ocean is unclear. We compiled surface particulate organic carbon (POC), and mineral ballast export fluxes from 55 different locations in the Atlantic and ...
  • On the sedimentological origin of down-core variations of bulk sedimentary nitrogen isotope ratios 

    Kienast, Markus; Higginson, M. J.; Mollenhauer, Gesine; Eglinton, Timothy I.; Chen, Min-Te; Calvert, Stephen E. (American Geophysical Union, 2005-05-27)
    The bulk sedimentary nitrogen isotopic composition of two cores from nearby sites on the northern slope of the South China Sea (Site 17940 and Ocean Drilling Program (ODP) Site 1144) differs by up to >2‰ during the last ...
  • Opal (Zn/Si) ratios as a nearshore geochemical proxy in coastal Antarctica 

    Hendry, Katharine R.; Rickaby, Rosalind E. M. (American Geophysical Union, 2008-06-18)
    During the last 50 years, the Antarctic Peninsula has experienced rapid warming with associated retreat of 87% of marine and tidewater glacier fronts. Accelerated glacial retreat and iceberg calving may have a significant ...
  • Organic chemicals of environmental concern : water sampling and analytical challenges 

    Farrington, John W. (The Oceanography Society, 2014-03)
    A detailed understanding of the biogeochemical cycles of organic chemicals of environmental concern (OCEC) in the ocean requires measurement of their concentrations in the water column. Obtaining these measurements remains ...
  • An organic geochemical approach to problems of glacial-interglacial climatic variability 

    Jasper, John P. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1988-05)
    The concentration and carbon isotopic composition (δ13C) of sedimentary organic carbon (Corg), N/C ratios, and terrigenous and marine δ13C-Corg end-members form a basis from which to address problems of Late Quaternary ...
  • Organic geochemistry of the early Toarcian oceanic anoxic event in Hawsker Bottoms, Yorkshire, England 

    French, Katherine L.; Sepulveda, Julio; Trabucho-Alexandre, J.; Grocke, D. R.; Summons, Roger E. (2013-12)
    A comprehensive organic geochemical investigation of the Hawsker Bottoms outcrop section in Yorkshire, England has provided new insights about environmental conditions leading into and during the Toarcian oceanic anoxic ...
  • Organic matter in river-influenced continental margin sediments : the land-ocean and climate linkage at the Late Quaternary Congo fan (ODP Site 1075) 

    Holtvoeth, Jens; Wagner, Thomas; Schubert, Carsten J. (American Geophysical Union, 2003-12-31)
    Late Quaternary sections (1.2 Ma) of ODP-Site 1075 from the Congo deep-sea fan are investigated to reconstruct variations of terrigenous organic matter supply to the eastern equatorial Atlantic. To characterize the organic ...
  • Organohalogen contaminants and metabolites in cerebrospinal fluid and cerebellum gray matter in short-beaked common dolphins and Atlantic white-sided dolphins from the western North Atlantic 

    Montie, Eric W.; Reddy, Christopher M.; Gebbink, Wouter A.; Touhey, Kathleen M.; Hahn, Mark E.; Letcher, Robert J. (2009-03-12)
    Concentrations of several congeners and classes of organohalogen contaminants (OHCs) and/or their metabolites, namely organochlorine pesticides (OCs), polychlorinated biphenyls (PCBs), hydroxylated-PCBs (OH-PCBs), ...