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Publications (* core publication)
Iversen, M.H. and Ploug, H. (2011) Temperature effects on carbon-specific respiration rate and sinking velocity of diatom aggregates. Is temperature a major limiting factor for carbon degradation in the deep ocean? ms to be submitted
Gärdes A., Iversen M. H., Grossart H-P., Passow U., Ullrich M. S. (2010) Diatom-associated bacteria are required for aggregation of Thalassiosira weissflogii.The ISME Journal, 1-10.
* Iversen, M.H. and Ploug, H. (2010) Ballast minerals and sinking carbon flux in the ocean: Carbon-specific respiration rates and sinking velocity of marine snow aggregates. Biogeosciences, 7, 2613-2624.
Ploug, H, Terbrüggen A, Kaufmann A, Wolf-Gladrow D, Passow U. (2010) A novel method to measure particle sinking velocity in vitro, and its comparison to three other in vitro methods. Limnology and Oceanography - Methods, 8, 386-393.
* Iversen, M. H., Nowald, N., Ploug, H., Jackson, G. A. and Fischer, G. (2010) High resolution profiles of vertical particulate organic matter export off Cape Blanc, Mauritania: Degradation processes and ballasting effects. Deep-Sea Res., doi:10.1016/j.dsr.2010.03.007.
* Zonneveld, K. A. F. Susek E. and Fischer G. (2010). Interannual and seasonal variability of the organic-walled dinoflagellate cyst production in the coastal upwelling region off Cape Blanc (Mauritania). Journal of Phycology 46,1: 202 - 215.
Hansell, D.A., Carlson, C.A., Repeta, D.J., Schlitzer, R. (2009) Dissolved organic matter in the ocean. A controversy stimulates new insights. Oceanography 22 (4), 202-211.
Schlitzer, R. (2009) Inverse Modeling of Tracers and Nutrients. In: Steele, J.H., Thorpe, S.A., Turekian, K.K. (Eds.), Encyclopedia of Ocean Sciences. Elsevier, Oxford, pp. 3879-3890.
* Karakas, G., Nowald, N., Schäfer-Neth, C., Iversen, M., Barkmann, W., Fischer, G., Marchesiello, P. and Schlitzer, R. (2009) Impact of particle aggregation on fluxes of organic matter. Prog. Oceanogr.,83, 331-341.
* Fischer, G., S. Neuer, R. Davenport, O. Romero, V. Ratmeyer, B. Donner, T. Freudenthal, H. Meggers and Wefer, G. (2010) The Northwest African Margin. In: Liu, K. K., Atkinson, L., Quinones, R., Talaue-McManaus, L. (Editors), Carbon and Nutrient Fluxes in Continental Margins: A Global Synthesis, IGBP Book Series. Springer, Berlin, pp. 77-103.
* Nowald, N., Fischer, G., Ratmeyer, V., Iversen, M., Reuter, C. and Wefer, G. (2009) In-situ sinking speed measurements of marine snow aggregates acquired with a settling chamber mounted to the Cherokee ROV. Oceans 2009, Bremen.
* Fischer, G., Reuter, C., Karakas, G., Nowald, N., Wefer, G. (2009) Offshore advection of particles within the Cape Blanc filament, Mauritania: Results from observational and modelling studies. Prog. Oceanogr. 83, 322-330.
Unger, D. and Jennerjahn, T. (2009) Impact of regional Indian Ocean characteristics on the biogeochemical variability of settling particles. In: Wiggert, J., Naqvi, S.W.A., Smith, S. and Hood, R.R. (Editors), Indian Ocean Biogeochemical Processes and Ecological Variability. Geophysical Monograph Series 185, AGU, 257-280.
Cao, L., Eby, M., Ridgwell, A., Caldeira, K., Archer, D., Ishida, A., Joos, F., Matsumoto, K., Mikolajewicz, U., Mouchet, A., Orr, J.C., Plattner, G.-K., Schlitzer, R., Tokos, K., Totterdell, I., Tschumi, T., Yamanaka, Y., Yool, A. (2009) The role of ocean transport in the uptake of anthropogenic CO2. Biogeosciences 6, 375-390.
Gregg, W.W., Friedrichs, M.A.M., Robinson, A.R., Rose, K.A., Schlitzer, R., Thompson, K.R., Doney, S.C. (2009) Skill assessment in ocean biological data assimilation. Journal of Marine Systems 76 (1-2), 16-33.
* Fischer, G. and Karakas, G. (2009) Sinking rates and ballast composition of particles in the Atlantic Ocean: implications for the organic carbon fluxes to the deep ocean. Biogeosciences, 6, 85-102.
Duce, R.A., LaRoche, J., Altieri, K., Arrigo, K.R., Baker, A.R., Capone, D.G., Cornell, S., Dentener, F., Galloway, J., Ganeshram, R.S., Geider, R., Jickells, T., Kuypers, M.M., Langlois, R., Liss, P.S., Liu, S.M., Middelburg, J.J., Moore, C.M., Nickovic, S., Oschlies, A., Pedersen, T., Prospero, J., Schlitzer, R., Seitzinger, S., Sorensen, L.L., Uematsu, M., Ulloa, O., Voss, M., Ward, B., Zamora, L., 2008. Impacts of Atmospheric Anthropogenic Nitrogen on the Open Ocean. Science 320, 893-897.
Thomas, H., Unger, D., Zhang, J., Liu, K.-K., and Shadwick, E. (2008) Biogeochemical cycling in semi-enclosed marine systems and contiental margins. In: Urban Jr., E.R., Sundby, B., Malanotte-Rizzoli, P. and Melillo, J. (Editors). Watersheds, bays and bounded seas: the science and management of semi-enclosed marine systems. SCOPE 70. Island Press, Washington, DC. 169-190.
* De La Rocha, C. L., Nowald, N. and Passow, U. (2008) Interactions between diatom aggregates, minerals, POC, and DOM: further implications for the ballast hypothesis. Global Biogeochem. Cycles, 22, GB4005, doi:10.1029/2007GB003156.
* Ploug, H., Iversen, M., and Fischer, G. (2008) Ballast, sinking velocity, and apparent diffusivity within marine snow and fecal pellets: Implications for substrate turnover by attached bacteria. Limnology and Oceanography, 53 (5), 1878-1886.
* Ploug, H., Iversen, M., Koski, M. and Buitenhuis, T.E. (2008) Production, oxygen respiration rates, and sinking velocity of copepod fecal pellets: direct measurements of ballasting by opal and calcite. Limnology and Oceanography, 53(2), 469-476.
Neuer, S., Andres, C., Helmke, P., Freudenthal, T., Davenport, R., Meggers, H., Knoll, M., Santana-Casiano, J.M., Gonzalez-Davila, M., Rueda, M.-J. and Llinas, O. (2007) Biogeochemistry and hydrography in the eastern subtropical North Atlantic Gyre. Results from the European time-series station ESTOC. Progress in Oceanography, 72, 1-29.
* Fischer, G., Karakas, G., Blaas, M. Ratmeyer, V., Nowald, N., Schlitzer, R., Helmke, P., Davenport, R., Donner, B., Neuer, S. and Wefer, G. (2007) Mineral ballast and particle settling rates in the coastal upwelling system off NW Africa and the South Atlantic. Int. J. Earth Sci., doi 10.1007/s00531-007-0234-7.
Ziveri, P., Bernardi, B. de, Baumann, K.-H., Stoll, H.M. and Mortyn, P.G. (2007). Sinking of coccolith carbonate and potential contribution to organic carbon ballasting in the deep ocean. Deep-Sea Research II,54, 659-675.
Sarmiento, J., Simeon, J., Gnanadesikan, A., Gruber, N., Key, R. and Schlitzer., R. (2007) Deep ocean biogeochemistry of silicic acid and nitrate. Global Biogeochemical Cycles 21 (1), 10.1029/2006GB002720.
* Ploug, H. and Passow, U. (2007) Direct measurement of diffusivity in diatom aggregates containing transparent exopolymer particles. Limnology and Oceanography, 52, 1-6.
Schlitzer, R. (2007) Assimilation of radiocarbon and chlorofluorocarbon data to constrain deep and bottom water transports in the world ocean. Journal of Physical Oceanography 37 (2), 259–276.
Inthorn, M., M. Rutgers van der Loeff and Zabel, M. (2006) A study of particle exchange at the sediment-water interface in the Benguela upwelling area based on 234Th/238U disequilibrium. Deep-Sea Research, 53, 1742-1761.
* Nowald, N. Karakas, G., Ratmeyer, V., Fischer, G., Schlitzer, R., Davenport, R.A. and Wefer, G. (2006), Distribution and transport processes of marine particulate matter off Cape Blanc (NW-Africa): results from vertical camera profiles. Ocean Science Discussions, Vol. 3, pp 903-938, 25-7-2006
Inthorn, M., Mohrholz, V. and Zabel, M. (2006) Nepheloid layer distribution in the Benguela upwelling area offshore Namibia. Deep-Sea Research I, 53, 1423-1438.
* Karakas, G., Nowald, N., Blaas, M., Marchesiello, M., Frickenhaus, S. and Schlitzer, R. (2006) High resolution modelling of sediment erosion and particle transport across the NW African shelf. Journal of Geophysical Research, 111, C06025, doi:10.1029/2005JC003296, 2006.
Unger, D. (2006). Nitrogen isotopic composition of sinking particles from the southern Bay of Bengal: evidence for variable nitrogen sources. Deep-Sea Research, 53, 1658-1676.
Stuut, J.-B., Zabel, M., Lavik, G., Schefuß, E., Ratmeyer V. and Schneider, R. R. (2005) Provenance of present-day eolian dust collected off NW Africa: implications for deep-marine sediment studies. Journal of Geophysical Research, Atmospheres, 110, D04202, doi:10.1029/2004JD005161.
Susek, E., Zonneveld, K.A.F., Fischer,G., Versteegh, G.J.M. and Willems, H. (2005) Organic walled dinoflagellate cyst production in relation to upwelling intensity and lithogenic influx in the Cape Blanc region (off north-west Africa). Phycological Research 53, 97-112.
Unger, D, V. Ittekkot, J. Tiemann and Schäfer, P. (2005) Biogeochemistry of particulate organic matter from the Bay of Bengal as discernible from hydrolyzable neutral carbohydrates and amino acids. Marine Chemistry 96(1-2), 155-184.
* Helmke, P., Romero, O. and Fischer, G. (2005) Northwest African upwelling and its effect on off-shore organic carbon export to the deep sea. Global Biogeochemical Cycles, 19, doi: 10.1029/2004/GB00265, 2005.
Zaric S., Donner, B., Fischer, G., Mulitza, S., and Wefer, G. (2005) Sensitivity of planktonic foraminifera to sea surface temperature and export production as derived from sediment trap data. Marine Micropaleontology., 55, 75-105.
Schneider, B, Schlitzer, R, Fischer, G, and Noethig, E-M (2003) Depth-dependent elemental compositions of particulate organic matter (POM) in the ocean. Global Biogeochemical Cycles, 17 (2), 1032, doi:10.029/2002GB001871.
Neuer, S, Torres-Padrón, ME, Gelado-Caballero, MD, Rueda, MJ, Hernández-Brito, J, Davenport, R, and Wefer, G. (2004) Dust deposition pulses to the eastern subtropical North Atlantic gyre: Does ocean’s biogeochemistry respond? Global Biogeochemical Cycles, 18, GB4020, doi:10.1029/2004GB002228.
* Antia, A.A., Koeve, W., Fischer, G., Blanz, T., Schulz-Bull, D., Scholten, J., Neuer, S., Kremling, K, Kuss, J., Peinert, R., Hebbeln, D., Bathmann, U., Conte, M., Fehner, U., and Zeitzschel, B. (2001) Basin-wide particulate carbon flux in the Atlantic Ocean: Regional export patterns and potential for atmospheric CO2 sequestration. Global Biogeochemical Cycles, 15 (4), 845-862.
* Müller, P.J. and G. Fischer (2001) A four-year record of alkenones in the filamentous upwelling zone off Cape Blanc, NW Africa and a comparison with distributions in the underlying sediments. Deep Sea Research I, 48 (8), 1877-1903.
Ragueneau, O., Tréguer, P., Anderson, R.F., Brzezinski, M.A., DeMaster, D.J., Dugdale, R.C., Dymond, J., Fischer, G., Francois, R., Heinze, C., Leynaert, A., Meier-Reimer, E., Martin-Jézéquel, V., Nelson, D.M., and Quéguiner, B. (2000) Understanding the Si cycle in the modern ocean, a pre-requisite for the use of biogenic opal as a paleoproductivity proxy. Global Planetary Change, 26, 317-365.