Now showing items 1-19 of 19

    • Basin-scale inputs of cobalt, iron, and manganese from the Benguela-Angola front to the South Atlantic Ocean 

      Noble, Abigail E.; Lamborg, Carl H.; Ohnemus, Daniel C.; Lam, Phoebe J.; Goepfert, Tyler J.; Measures, Christopher I.; Frame, Caitlin H.; Casciotti, Karen L.; DiTullio, Giacomo R.; Jennings, Joe C.; Saito, Mak A. (Association for the Sciences of Limnology and Oceanography, 2012-07)
      We present full-depth zonal sections of total dissolved cobalt, iron, manganese, and labile cobalt from the South Atlantic Ocean. A basin-scale plume from the African coast appeared to be a major source of dissolved metals ...
    • Biogeochemical iron budgets of the Southern Ocean south of Australia : decoupling of iron and nutrient cycles in the subantarctic zone by the summertime supply 

      Bowie, Andrew R.; Lannuzel, Delphine; Remenyi, Tomas A.; Wagener, Thibaut; Lam, Phoebe J.; Boyd, Philip W.; Guieu, Cecile; Townsend, Ashley T.; Trull, Thomas W. (American Geophysical Union, 2009-12-31)
      Climate change is projected to significantly alter the delivery (stratification, boundary currents, aridification of landmasses, glacial melt) of iron to the Southern Ocean. We report the most comprehensive suite of ...
    • Carbon export and transfer to depth across the Southern Ocean Great Calcite Belt 

      Rosengard, Sarah Z.; Lam, Phoebe J.; Balch, William M.; Auro, Maureen E.; Pike, Steven M.; Drapeau, David T.; Bowler, Bruce C. (Copernicus Publications on behalf of the European Geosciences Union, 2015-07-02)
      Sequestration of carbon by the marine biological pump depends on the processes that alter, remineralize, and preserve particulate organic carbon (POC) during transit to the deep ocean. Here, we present data collected from ...
    • Comparison of particulate trace element concentrations in the North Atlantic Ocean as determined with discrete bottle sampling and in situ pumping 

      Twining, Benjamin S.; Rauschenberg, Sara; Morton, Peter L.; Ohnemus, Daniel C.; Lam, Phoebe J. (2014-08)
      The oceanic geochemical cycles of many metals are controlled, at least in part, by interactions with particulate matter, and measurements of particulate trace metals are a core component of the international GEOTRACES ...
    • The continental margin is a key source of iron to the HNLC North Pacific Ocean 

      Lam, Phoebe J.; Bishop, James K. B. (American Geophysical Union, 2008-04-09)
      Here we show that labile particulate iron and manganese concentrations in the upper 500 m of the Western Subarctic Pacific, an iron-limited High Nutrient Low Chlorophyll (HNLC) region, have prominent subsurface maxima ...
    • Cycling of lithogenic marine particles in the US GEOTRACES North Atlantic transect 

      Ohnemus, Daniel C.; Lam, Phoebe J. (Elsevier, 2014-12-06)
      In this paper, we present, describe, and model the first size-fractionated (0.8–51 µm; >51 µm) water-column particulate trace metal results from the US GEOTRACES North Atlantic Zonal Transect in situ pumping survey, with ...
    • Distributions of dissolved and particulate iron in the sub-Antarctic and Polar Frontal Southern Ocean (Australian sector) 

      Lannuzel, Delphine; Bowie, Andrew R.; Remenyi, Tomas A.; Lam, Phoebe J.; Townsend, Ashley T.; Ibisanmi, Enitan; Butler, Edward; Wagener, Thibaut; Schoemann, Veronique (2011-01)
      This paper presents iron (Fe) profiles in the upper 1000 m from nine short-term (transect) stations and three long-term (process) stations occupied in the Australian sector of the Southern Ocean during the SAZ-Sense ...
    • Dynamics of particulate organic carbon flux in a global ocean model 

      Lima, Ivan D.; Lam, Phoebe J.; Doney, Scott C. (Copernicus Publications on behalf of the European Geosciences Union, 2014-02-27)
      The sinking of particulate organic carbon (POC) is a key component of the ocean carbon cycle and plays an important role in the global climate system. However, the processes controlling the fraction of primary production ...
    • The GEOTRACES Intermediate Data Product 2014 

      Mawji, Edward; Schlitzer, Reiner; Dodas, Elena Masferrer; Abadie, Cyril; Abouchami, Wafa; Anderson, Robert F.; Baars, Oliver; Bakker, Karel; Baskaran, Mark; Bates, Nicholas R.; Bluhm, Bluhm; Bowie, Andrew; Bown, Johann; Boye, Marie; Marie, Edward A.; Branellec, Pierre; Bruland, Kenneth W.; Brzezinski, Mark A.; Bucciarelli, Eva; Buesseler, Ken O.; Butler, Edward; Cai, Pinghe; Cardinal, Damien; Casciotti, Karen L.; Chaves, Joaquin; Cheng, Hai; Chever, Fanny; Church, Thomas M.; Colman, Albert S.; Conway, Tim M.; Croot, Peter L.; Cutter, Gregory A.; de Baar, Hein J. W.; de Souza, Gregory F.; Dehairs, Frank; Deng, Feifei; Dieu, Huong Thi; Dulaquais, Gabriel; Echegoyen-Sanz, Yolanda; Edwards, R. Lawrence; Fahrbach, Eberhard; Fitzsimmons, Jessica N.; Fleisher, Martin; Frank, Martin; Friedrich, Jana; Fripiat, Francois; Galer, Stephen J. G.; Gamo, Toshitaka; Garcia Solsona, Ester; Gerringa, Loes J. A.; Godoy, Jose Marcus; Gonzalez, Santiago; Grossteffan, Emilie; Hatta, Mariko; Hayes, Christopher T.; Heller, Maija Iris; Henderson, Gideon M.; Huang, Kuo-Fang; Jeandel, Catherine; Jenkins, William J.; John, Seth G.; Kenna, Timothy C.; Klunder, Maarten; Kretschmer, Sven; Kumamoto, Yuichiro; Laan, Patrick; Labatut, Marie; Lacan, Francois; Lam, Phoebe J.; Lannuzel, Delphine; le Moigne, Frederique; Lechtenfeld, Oliver J.; Lohan, Maeve C.; Lu, Yanbin; Masque, Pere; McClain, Charles R.; Measures, Christopher; Middag, Rob; Moffett, James; Navidad, Alicia; Nishioka, Jun; Noble, Abigail E.; Obata, Hajime; Ohnemus, Daniel C.; Owens, Stephanie A.; Planchon, Frederic; Pradoux, Catherine; Puigcorbe, Viena; Quay, Paul D.; Radic, Amandine; Rehkamper, Mark; Remenyi, Tomas; Rijkenberg, Micha J. A.; Rintoul, Stephen; Robinson, Laura F.; Roeske, Tobias; Rosenberg, Mark; Rutgers van der Loeff, Michiel; Ryabenko, Evgenia; Saito, Mak A.; Roshan, Saeed; Salt, Lesley; Sarthou, Geraldine; Schauer, Ursula; Scott, Peter M.; Sedwick, Peter N.; Sha, Lijuan; Shiller, Alan M.; Sigman, Daniel M.; Smethie, William; Smith, Geoffrey J.; Sohrin, Yoshiki; Speich, Sabrina; Stichel, Torben; Stutsman, Johnny; Swift, James H.; Tagliabue, Alessandro; Thomas, Alexander L.; Tsunogai, Urumu; Twining, Benjamin S.; van Aken, Hendrik M.; van Heuven, Steven; van Ooijen, Jan; van Weerlee, Evaline; Venchiarutti, Celia; Voelker, Antje H. L.; Wake, Bronwyn; Warner, Mark J.; Woodward, E. Malcolm S.; Wu, Jingfeng; Wyatt, Neil; Yoshikawa, Hisayuki; Zheng, Xin-Yuan; Xue, Zichen; Zieringer, Moritz; Zimmer, Louise A. (Elsevier, 2015-04-16)
      The GEOTRACES Intermediate Data Product 2014 (IDP2014) is the first publicly available data product of the international GEOTRACES programme, and contains data measured and quality controlled before the end of 2013. It ...
    • High biomass, low export regimes in the Southern Ocean 

      Lam, Phoebe J.; Bishop, James K. B. (2006-06-28)
      This paper investigates ballasting and remineralization controls of carbon sedimentation in the twilight zone (100-1000 m) of the Southern Ocean. Size-fractionated (<1 μm, 1-51 μm, >51 μm) suspended particulate matter ...
    • Intensity of Th and Pa scavenging partitioned by particle chemistry in the North Atlantic Ocean 

      Hayes, Christopher T.; Anderson, Robert F.; Fleisher, Martin Q.; Vivancos, Sebastian M.; Lam, Phoebe J.; Ohnemus, Daniel C.; Huang, Kuo-Fang; Robinson, Laura F.; Lu, Yanbin; Cheng, Hai; Edwards, R. Lawrence; Moran, S. Bradley (2015-01)
      The natural radionuclides 231Pa and 230Th are incorporated into the marine sediment record by scavenging, or adsorption to various particle types, via chemical reactions that are not fully understood. Because these ...
    • 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)
    • Size-fractionated major particle composition and concentrations from the US GEOTRACES North Atlantic Zonal Transect 

      Lam, Phoebe J.; Ohnemus, Daniel C.; Auro, Maureen E. (Elsevier, 2014-11-18)
      The concentration and the major phase composition (particulate organic matter, CaCO3, opal, lithogenic matter, and iron and manganese oxyhydroxides) of marine particles is thought to determine the scavenging removal of ...
    • Small phytoplankton drive high summertime carbon and nutrient export in the Gulf of California and Eastern Tropical North Pacific 

      Puigcorbe, Viena; Benitez-Nelson, Claudia R.; Masque, Pere; Verdeny, Elisabet; White, Angelicque E.; Popp, Brian N.; Prahl, Fredrick G.; Lam, Phoebe J. (John Wiley & Sons, 2015-08-31)
      Summertime carbon, nitrogen, and biogenic silica export was examined using 234Th:238U disequilibria combined with free floating sediment traps and fine scale water column sampling with in situ pumps (ISP) within the Eastern ...
    • 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 ...
    • Visualising Fe speciation diversity in ocean particulate samples by micro X-ray absorption near-edge spectroscopy 

      Marcus, Matthew A.; Lam, Phoebe J. (CSIRO Publishing, 2013-10-09)
      It is a well known truism that natural materials are inhomogeneous, so analysing them on a point-by-point basis can generate a large volume of data, from which it becomes challenging to extract understanding. In this paper, ...
    • What can paired measurements of Th isotope activity and particle concentration tell us about particle cycling in the ocean? 

      Marchal, Olivier; Lam, Phoebe J. (2012-04-17)
      The ability of paired measurements of thorium isotope activity and particle concentration to constrain rate constants of sorption reactions and particle dynamics in the ocean is examined. This study is motivated by GEOTRACES ...
    • What did we learn about ocean particle dynamics in the GEOSECS–JGOFS era? 

      Jeandel, Catherine; Rutgers van der Loeff, Michiel M.; Lam, Phoebe J.; Roy-Barman, Matthieu; Sherrell, Robert M.; Kretschmer, Sven; German, Christopher R.; Dehairs, Frank (2014-12-30)
      Particles determine the residence time of many dissolved elements in seawater. Although a substantial number of field studies were conducted in the framework of major oceanographic programs as GEOSECS and JGOFS, knowledge ...
    • Wintertime phytoplankton bloom in the subarctic Pacific supported by continental margin iron 

      Lam, Phoebe J.; Bishop, James K. B.; Henning, Cara C.; Marcus, Matthew A.; Waychunas, Glenn A.; Fung, Inez Y. (American Geophysical Union, 2006-02-01)
      Heightened biological activity was observed in February 1996 in the high-nutrient low-chlorophyll (HNLC) subarctic North Pacific Ocean, a region that is thought to be iron-limited. Here we provide evidence supporting the ...