Now showing items 1-10 of 10

  • Challenges of modeling depth-integrated marine primary productivity over multiple decades : a case study at BATS and HOT 

    Saba, Vincent S.; Friedrichs, Marjorie A. M.; Carr, Mary-Elena; Antoine, David; Armstrong, Robert A.; Asanuma, Ichio; Aumont, Olivier; Bates, Nicholas R.; Behrenfeld, Michael J.; Bennington, Val; Bopp, Laurent; Bruggeman, Jorn; Buitenhuis, Erik T.; Church, Matthew J.; Ciotti, Aurea M.; Doney, Scott C.; Dowell, Mark; Dunne, John P.; Dutkiewicz, Stephanie; Gregg, Watson; Hoepffner, Nicolas; Hyde, Kimberly J. W.; Ishizaka, Joji; Kameda, Takahiko; Karl, David M.; Lima, Ivan D.; Lomas, Michael W.; Marra, John; McKinley, Galen A.; Melin, Frederic; Moore, J. Keith; Morel, Andre; O'Reilly, John; Salihoglu, Baris; Scardi, Michele; Smyth, Tim J.; Tang, Shilin; Tjiputra, Jerry; Uitz, Julia; Vichi, Marcello; Waters, Kirk; Westberry, Toby K.; Yool, Andrew (American Geophysical Union, 2010-09-15)
    The performance of 36 models (22 ocean color models and 14 biogeochemical ocean circulation models (BOGCMs)) that estimate depth-integrated marine net primary productivity (NPP) was assessed by comparing their output to ...
  • Data-based assessment of environmental controls on global marine nitrogen fixation 

    Luo, Ya-Wei; Lima, Ivan D.; Karl, David M.; Deutsch, Curtis A.; Doney, Scott C. (Copernicus Publications on behalf of the European Geosciences Union, 2014-02-06)
    There are a number of hypotheses concerning the environmental controls on marine nitrogen fixation (NF). Most of these hypotheses have not been assessed against direct measurements on the global scale. In this study, we ...
  • Distinct dissolved organic matter sources induce rapid transcriptional responses in coexisting populations of Prochlorococcus, Pelagibacter and the OM60 clade 

    Sharma, Adrian K.; Becker, Jamie W.; Ottesen, Elizabeth A.; Bryant, Jessica A.; Duhamel, Solange; Karl, David M.; Cordero, Otto X.; Repeta, Daniel J.; DeLong, Edward F. (2013-07)
    A considerable fraction of the Earth's organic carbon exists in dissolved form in seawater. To investigate the roles of planktonic marine microbes in the biogeochemical cycling of this dissolved organic matter (DOM), we ...
  • Evaluating triple oxygen isotope estimates of gross primary production at the Hawaii Ocean Time-series and Bermuda Atlantic Time-series Study sites 

    Nicholson, David P.; Stanley, Rachel H. R.; Barkan, Eugeni; Karl, David M.; Luz, Boaz; Quay, Paul D.; Doney, Scott C. (American Geophysical Union, 2012-05-08)
    The triple oxygen isotopic composition of dissolved oxygen (17Δ) is a promising tracer of gross oxygen productivity (P) in the ocean. Recent studies have inferred a high and variable ratio of P to 14C net primary productivity ...
  • Interannual variability of primary production and dissolved organic nitrogen storage in the North Pacific Subtropical Gyre 

    Luo, Ya-Wei; Ducklow, Hugh W.; Friedrichs, Marjorie A. M.; Church, Matthew J.; Karl, David M.; Doney, Scott C. (American Geophysical Union, 2012-08-10)
    The upper ocean primary production measurements from the Hawaii Ocean Time series (HOT) at Station ALOHA in the North Pacific Subtropical Gyre showed substantial variability over the last two decades. The annual average ...
  • Phosphate availability and the ultimate control of new nitrogen input by nitrogen fixation in the tropical Pacific Ocean 

    Moutin, T.; Karl, David M.; Duhamel, Solange; 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 ...
  • Quantifying subtropical North Pacific gyre mixed layer primary productivity from Seaglider observations of diel oxygen cycles 

    Nicholson, David P.; Wilson, Samuel T.; Doney, Scott C.; Karl, David M. (John Wiley & Sons, 2015-05-22)
    Using autonomous underwater gliders, we quantified diurnal periodicity in dissolved oxygen, chlorophyll, and temperature in the subtropical North Pacific near the Hawaii Ocean Time-series (HOT) Station ALOHA during summer ...
  • Revisiting carbon flux through the ocean's twilight zone 

    Buesseler, Ken O.; Lamborg, Carl H.; Boyd, Philip W.; Lam, Phoebe J.; Trull, Thomas W.; Bidigare, Robert R.; Bishop, James K. B.; Casciotti, Karen L.; Dehairs, Frank; Elskens, Marc; Honda, Makio C.; Karl, David M.; Siegel, David A.; Silver, Mary W.; Steinberg, Deborah K.; Valdes, James R.; Van Mooy, Benjamin A. S.; Wilson, Stephanie E. (American Association for the Advancement of Science, 2007-04-27)
  • VERTIGO (VERtical Transport In the Global Ocean) : a study of particle sources and flux attenuation in the North Pacific 

    Buesseler, Ken O.; Trull, Thomas W.; Steinberg, Deborah K.; Silver, Mary W.; Siegel, David A.; Saitoh, S.-I.; Lamborg, Carl H.; Lam, Phoebe J.; Karl, David M.; Jiao, N. Z.; Honda, Makio C.; Elskens, Marc; Dehairs, Frank; Brown, S. I.; Boyd, Philip W.; Bishop, James K. B.; Bidigare, Robert R. (2008-03-21)
    The VERtical Transport In the Global Ocean (VERTIGO) study examined particle sources and fluxes through the ocean’s “twilight zone” (defined here as depths below the euphotic zone to 1000 m). Interdisciplinary process ...
  • Will ocean acidification affect marine microbes? 

    Joint, Ian; Doney, Scott C.; Karl, David M. (2010-05)
    The pH of the surface ocean is changing as a result of increases in atmospheric carbon dioxide (CO2) and there are concerns about potential impacts of lower pH and associated alterations in seawater carbonate chemistry ...