Now showing items 571-590 of 866

    • Obliquity-driven expansion of North Atlantic sea ice during the last glacial 

      Turney, Chris S. M.; Thomas, Zoe A.; Hutchinson, David K.; Bradshaw, Corey J. A.; Brook, Barry W.; England, Matthew H.; Fogwill, Christopher J.; Jones, Richard T.; Palmer, Jonathan; Hughen, Konrad A.; Cooper, Alan (John Wiley & Sons, 2015-12-10)
      North Atlantic late Pleistocene climate (60,000 to 11,650 years ago) was characterized by abrupt and extreme millennial duration oscillations known as Dansgaard-Oeschger (D-O) events. However, during the Last Glacial Maximum ...
    • Observations of carbon export by small sinking particles in the upper mesopelagic 

      Durkin, Colleen A.; Estapa, Margaret L.; Buesseler, Ken O. (Elsevier, 2015-02-27)
      Carbon and nutrients are transported out of the surface ocean and sequestered at depth by sinking particles. Sinking particle sizes span many orders of magnitude and the relative influence of small particles on carbon ...
    • 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. ...
    • Observed eastward progression of the Fukushima 134Cs signal across the North Pacific 

      Yoshida, Sachiko; Macdonald, Alison M.; Jayne, Steven R.; Rypina, Irina I.; Buesseler, Ken O. (John Wiley & Sons, 2015-09-09)
      Radionuclide samples taken as part of hydrographic surveys at 30°N in the North Pacific reveal that the easternmost edge of Fukushima-derived 134Cs observed at 174.3°W in 2012 had progressed eastward across the basin to ...
    • 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 in the surface waters of the Pacific-Arctic boundary regions 

      Mathis, Jeremy T.; Cross, Jessica N.; Evans, Wiley; Doney, Scott C. (The Oceanography Society, 2015-06)
      The continental shelves of the Pacific-Arctic Region (PAR) are especially vulnerable to the effects of ocean acidification (OA) because the intrusion of anthropogenic CO2 is not the only process that can reduce pH and ...
    • Ocean acidification risk assessment for Alaska’s fishery sector 

      Mathis, Jeremy T.; Cooley, Sarah R.; Lucey, Noelle; Colt, Steve; Ekstrom, Julia; Hurst, Tom; Hauri, Claudine; Evans, Wiley; Cross, Jessica N.; Feely, Richard A. (Elsevier, 2014-07-14)
      The highly productive fisheries of Alaska are located in seas projected to experience strong global change, including rapid transitions in temperature and ocean acidification-driven changes in pH and other chemical parameters. ...
    • 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 and coastal acidification off New England and Nova Scotia 

      Gledhill, Dwight K.; White, Meredith M.; Salisbury, Joseph E.; Thomas, Helmuth; Mlsna, Ivy; Liebman, Matthew; Mook, Bill; Grear, Jason S.; Candelmo, Allison C.; Chambers, R. Christopher; Gobler, Christopher J.; Hunt, Christopher W.; King, Andrew L.; Price, Nichole N.; Signorini, Sergio R.; Stancioff, Esperanza; Stymiest, Cassie; Wahle, Richard A.; Waller, Jesica D.; Rebuck, Nathan D.; Wang, Zhaohui Aleck; Capson, Todd L.; Morrison, J. Ruairidh; Cooley, Sarah R.; Doney, Scott C. (The Oceanography Society, 2015-06)
      New England coastal and adjacent Nova Scotia shelf waters have a reduced buffering capacity because of significant freshwater input, making the region’s waters potentially more vulnerable to coastal acidification. Nutrient ...
    • 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) ...
    • Ocean circulation and biogeochemistry moderate interannual and decadal surface water pH changes in the Sargasso Sea 

      Goodkin, Nathalie F.; Wang, Bo-Shian; You, Chen-Feng; Hughen, Konrad A.; Grumet-Prouty, Nancy; Bates, Nicholas R.; Doney, Scott C. (John Wiley & Sons, 2015-06-25)
      The oceans absorb anthropogenic CO2 from the atmosphere, lowering surface ocean pH, a concern for calcifying marine organisms. The impact of ocean acidification is challenging to predict as each species appears to respond ...
    • 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 G. (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 ...