Articles | Volume 21, issue 22
https://doi.org/10.5194/bg-21-5261-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-21-5261-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 Nov 2024
Research article |
| 26 Nov 2024
| 26 Nov 2024
The influence of zooplankton and oxygen on the particulate organic carbon flux in the Benguela Upwelling System
Luisa Chiara Meiritz
CORRESPONDING AUTHOR
Institute for Geology, Universität Hamburg, Hamburg, Germany
GEOMAR Helmholtz Center for Ocean Research Kiel, Kiel, Germany
Tim Rixen
Institute for Geology, Universität Hamburg, Hamburg, Germany
ZMT Leibniz-Centre for Tropical Marine Research, Bremen, Germany
Anja Karin van der Plas
National Marine Information and Research Centre (NatMIRC), Ministry of Fisheries and Marine Resources, Swakopmund, Namibia
Tarron Lamont
Oceans and Coasts Research, Department of Forestry, Fisheries, and the Environment, Cape Town, South Africa
Bayworld Centre for Research & Education, Cape Town, South Africa
Oceanography Department, University of Cape Town, Cape Town, South Africa
Niko Lahajnar
Institute for Geology, Universität Hamburg, Hamburg, Germany
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Jonathan Andrew Baker, Richard Renshaw, Laura Claire Jackson, Clotilde Dubois, Doroteaciro Iovino, Hao Zuo, Renellys C. Perez, Shenfu Dong, Marion Kersalé, Michael Mayer, Johannes Mayer, Sabrina Speich, and Tarron Lamont
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Maria-Elena Vorrath, Juliane Müller, Paola Cárdenas, Thomas Opel, Sebastian Mieruch, Oliver Esper, Lester Lembke-Jene, Johan Etourneau, Andrea Vieth-Hillebrand, Niko Lahajnar, Carina B. Lange, Amy Leventer, Dimitris Evangelinos, Carlota Escutia, and Gesine Mollenhauer
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Birgit Gaye, Niko Lahajnar, Natalie Harms, Sophie Anna Luise Paul, Tim Rixen, and Kay-Christian Emeis
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Tim Rixen, Greg Cowie, Birgit Gaye, Joaquim Goes, Helga do Rosário Gomes, Raleigh R. Hood, Zouhair Lachkar, Henrike Schmidt, Joachim Segschneider, and Arvind Singh
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Cited articles
Anderson, L. A.: On the hydrogen and oxygen content of marine phytoplankton, Deep-Sea Res. Pt. I, 42, 1675–1680, https://doi.org/10.1016/0967-0637(95)00072-e, 1995.
Archibald, K. M., Siegel, D. A., and Doney, S. C.: Modeling the Impact of Zooplankton Diel Vertical Migration on the Carbon Export Flux of the Biological Pump, Global Biogeochem. Cy., 33, 181–199, https://doi.org/10.1029/2018GB005983, 2019.
Atwood, T. B., Witt, A., Mayorga, J., Hammill, E., and Sala, E.: Global Patterns in Marine Sediment Carbon Stocks, Frontiers in Marine Science, 7, 165, 2020.
Bailey, G. W.: Organic carbon flux and development of oxygen deficiency on the modern Benguela continental shelf south of 22° S: Spatial and temporal variability, in: Modern and Ancient Continental Shelf Anoxia, edited by: Tyson, R. V. and Pearson, T. H., Geological Society, London, UK, 171–183, https://doi.org/10.1144/gsl.sp.1991.058.01.12, 1991.
Bakun, A.: Climate change and ocean deoxygenation within intensified surface-driven upwelling circulations, Philos. T. R. Soc. A, 375, 20160327, https://doi.org/10.1098/rsta.2016.0327, 2017.
Barlow, R., Lamont, T., Mitchell-Innes, B., Lucas, M., and Thomalla, S.: Primary production in the Benguela ecosystem, 1999–2002, Afr. J. Mar. Sci., 31, 97–101, https://doi.org/10.2989/ajms.2009.31.1.9.780, 2009.
Behrenfeld, M. J. and Falkowski, P. G.: Photosynthetic rates derived from satellite-based chlorophyll concentration, Limnol. Oceanogr., 42, 1–20, 1997.
Bianchi, D., Galbraith, E. D., Carozza, D. A., Mislan, K. A. S., and Stock, C. A.: Intensification of open-ocean oxygen depletion by vertically migrating animals, Nat. Geosci., 6, 545–548, 2013.
Bianchi, D., Carozza David, A., Galbraith Eric, D., Guiet, J., and DeVries, T.: Estimating global biomass and biogeochemical cycling of marine fish with and without fishing, Sci. Adv., 7, eabd7554, https://doi.org/10.1126/sciadv.abd7554, 2021.
Bode, M., Kreiner, A., van der Plas, A. K., Louw, D. C., Horaeb, R., Auel, H., and Hagen, W.: Spatio-Temporal Variability of Copepod Abundance along the 20° S Monitoring Transect in the Northern Benguela Upwelling System from 2005 to 2011, PLOS ONE, 9, e97738, https://doi.org/10.1371/journal.pone.0097738, 2014.
Bordbar, M. H., Mohrholz, V., and Schmidt, M.: The Relation of Wind-Driven Coastal and Offshore Upwelling in the Benguela Upwelling System, J. Phys. Oceanogr., 51, 3117–3133, https://doi.org/10.1175/JPO-D-20-0297.1, 2021.
Boyd, P. W., Claustre, H., Levy, M., Siegel, D. A., and Weber, T.: Multi-faceted particle pumps drive carbon sequestration in the ocean, Nature, 568, 327–335, https://doi.org/10.1038/s41586-019-1098-2, 2019.
Cael, B. B. and Bisson, K.: Particle Flux Parameterizations: Quantitative and Mechanistic Similarities and Differences, Frontiers in Marine Science, 5, 1–5, https://doi.org/10.3389/fmars.2018.00395, 2018.
Cavan, E. L., Henson, S. A., Belcher, A., and Sanders, R.: Role of zooplankton in determining the efficiency of the biological carbon pump, Biogeosciences, 14, 177–186, https://doi.org/10.5194/bg-14-177-2017, 2017.
Cavan, E. L., Kawaguchi, S., and Boyd, P. W.: Implications for the mesopelagic microbial gardening hypothesis as determined by experimental fragmentation of Antarctic krill fecal pellets, Ecol. Evol., 11, 1023–1036, https://doi.org/10.1002/ece3.7119, 2021.
Carr, M.-E.: Estimation of potential productivity in Eastern Boundary Currents using remote sensing, Deep-Sea Res. Pt. II, 49, 59–80, 2001.
Castellani, C. and Edwards, M.: Marine Plankton: A Practical Guide to Ecology, Methodology, and Taxonomy, Limnology and Oceanography Bulletin, 26, 704, https://doi.org/10.1002/lob.10199, 2017.
Chavez, F. P. and Messié, M.: A comparison of Eastern Boundary Upwelling Ecosystems, Prog. Oceanogr., 83, 80–96, 2009.
Chavez, F. P. and Toggweiler, J. R.: Physical estimates of global new production: The upwelling contribution, in: Upwelling in the ocean, modern processes and ancient records, edited by: Summerhayes, C. P., Emeis, K.-C., Angel, M. V., Smith, R. L., and Zeitschel, B., Wiley & Sons, Chichester, 313–320, ISBN 0471960411, 1995.
Cockcroft, A. C.: Jasus lalandii 'walkouts' or mass strandings in South Africa during the 1990s: an overview, Mar. Freshwater Res., 52, 1085–1093, 2001.
Cockcroft, A. C., van Zyl, D., and Hutchings, L.: Large-scale changes in the spatial distribution of South African West Coast rock lobsters: an overview, Afr. J. Mar. Sci., 30, 149–159, https://doi.org/10.2989/AJMS.2008.30.1.15.465, 2008.
del Giorgio, P. A. and Duarte, C. M.: Respiration in the open ocean, Nature, 420, 379–384, 2002.
DeVries, T. and Deutsch, C.: Large-scale variations in the stoichiometry of marine organic matter respiration, Nat. Geosci., 7, 890–894, 2014.
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. J., 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., and Zamora, L.: Impacts of Atmospheric Anthropogenic Nitrogen on the Open Ocean, Science, 320, 893–897, https://doi.org/10.1126/science.1150369, 2008.
Ducklow, H. W., Steinberg, D. K., and Buesseler, K. O.: Upper ocean carbon export and the biological pump, Oceanography, 14, 50–58, https://doi.org/10.5670/oceanog.2001.06, 2001.
Ekau, W., Auel, H., Hagen, W., Koppelmann, R., Wasmund, N., Bohata, K., Buchholz, F., Geist, S., Martin, B., Schukat, A., Verheye, H. M., and Werner, T.: Pelagic key species and mechanisms driving energy flows in the northern Benguela upwelling ecosystem and their feedback into biogeochemical cycles, J. Marine Syst., 188, 49–62, https://doi.org/10.1016/j.jmarsys.2018.03.001, 2018.
Emeis, K., Eggert, A., Flohr, A., Lahajnar, N., Nausch, G., Neumann, A., Rixen, T., Schmidt, M., Van der Plas, A., and Wasmund, N.: Biogeochemical processes and turnover rates in the Northern Benguela Upwelling System, J. Marine Syst., 188, 63–80, https://doi.org/10.1016/j.jmarsys.2017.10.001, 2018.
Eppley, R. W. and Peterson, B. J.: Particulate organic-matter flux and planktonic new production in the deep ocean, Nature, 282, 677–680, https://doi.org/10.1038/282677a0, 1979.
European Marine Board: Blue Carbon: Challenges and opportunities to mitigate the climate and biodiversity crises, EMB Policy Brief No. 11, Zenodo, https://doi.org/10.5281/zenodo.8314215, ISSN: 0778-3590 ISBN: 978946420, 2023.
Flohr, A., van der Plas, A. K., Emeis, K.-C., Mohrholz, V., and Rixen, T.: Spatio-temporal patterns of C : N : P ratios in the northern Benguela upwelling system, Biogeosciences, 11, 885–897, https://doi.org/10.5194/bg-11-885-2014, 2014.
Flynn, R. F., Granger, J., Veitch, J. A., Siedlecki, S., Burger, J. M., Pillay, K., and Fawcett, S. E.: On-Shelf Nutrient Trapping Enhances the Fertility of the Southern Benguela Upwelling System, J. Geophys. Res.-Oceans, 125, e2019JC015948, https://doi.org/10.1029/2019JC015948, 2020.
Francois, R., Honjo, S., Krishfield, R., and Manganini, S.: Factors controlling the flux of organic carbon to the bathypelagic zone of the ocean, Global Biogeochem. Cy., 16, 34-1–34-20, https://doi.org/10.1029/2001gb001722, 2002.
Giering, S. L. C., Sanders, R., Lampitt, R. S., Anderson, T. R., Tamburini, C., Boutrif, M., Zubkov, M. V., Marsay, C. M., Henson, S. A., Saw, K., Cook, K., and Mayor, D. J.: Reconciliation of the carbon budget in the ocean/'s twilight zone, Nature, 507, 480–483, 2014.
Haake, B., Ittekkot, V., Rixen, T., Ramaswamy, V., Nair, R. R., and Curry, W. B.: Seasonality and interannual variability of particle fluxes to the deep Arabian Sea, Deep-Sea Res. Pt. I, 40, 1323–1344, 1993.
Halpern, B. S., Longo, C., Hardy, D., McLeod, K. L., Samhouri, J. F., Katona, S. K., Kleisner, K., Lester, S. E., O'Leary, J., Ranelletti, M., Rosenberg, A. A., Scarborough, C., Selig, E. R., Best, B. D., Brumbaugh, D. R., Chapin, F. S., Crowder, L. B., Daly, K. L., Doney, S. C., Elfes, C., Fogarty, M. J., Gaines, S. D., Jacobsen, K. I., Karrer, L. B., Leslie, H. M., Neeley, E., Pauly, D., Polasky, S., Ris, B., St Martin, K., Stone, G. S., Sumaila, U. R., and Zeller, D.: An index to assess the health and benefits of the global ocean, Nature, 488, 615–620, https://doi.org/10.1038/nature11397, 2012.
Honjo, S., Manganini, S. J., and Cole, J. J.: Sedimentation of biogenic matter in the deep ocean, Deep-Sea Res., 29, 609–625, https://doi.org/10.1016/0198-0149(82)90079-6, 1982.
Honjo, S., Manganini, S. J., Krishfield, R. A., and Francois, R.: Particulate organic carbon fluxes to the ocean interior and factors controlling the biological pump: A synthesis of global sediment trap programs since 1983, Prog. Oceanogr., 76, 217–285, https://doi.org/10.1016/j.pocean.2007.11.003, 2008.
Hutchings, L., van der Lingen, C. D., Shannon, L. J., Crawford, R. J. M., Verheye, H. M. S., Bartholomae, C. H., van der Plas, A. K., Louw, D., Kreiner, A., Ostrowski, M., Fidel, Q., Barlow, R. G., Lamont, T., Coetzee, J., Shillington, F., Veitch, J., Currie, J. C., and Monteiro, P. M. S.: The Benguela Current: An ecosystem of four components, Prog. Oceanogr., 83, 15–32, 2009.
IRI/LDEO Climate Data Library: NOAA NCEP EMC CMB GLOBAL Reyn_SmithOIv2 monthly sst: Sea Surface Temperature data, IRI/LDEO Climate Data Library [data set], http://iridl.ldeo.columbia.edu/SOURCES/.NOAA/.NCEP/.EMC/.CMB/.GLOBAL/.Reyn_SmithOIv2/.monthly/.sst/, last access: 20 November 2024.
Jouffray, J.-B., Blasiak, R., Norström, A. V., Österblom, H., and Nyström, M.: The Blue Acceleration: The Trajectory of Human Expansion into the Ocean, One Earth, 2, 43–54, https://doi.org/10.1016/j.oneear.2019.12.016, 2020.
Kalvelage, T., Jensen, M. M., Contreras, S., Revsbech, N. P., Lam, P., Günter, M., LaRoche, J., Lavik, G., and Kuypers, M. M. M.: Oxygen Sensitivity of Anammox and Coupled N-Cycle Processes in Oxygen Minimum Zones, PLoS ONE, 6, e29299, https://doi.org/10.1371/journal.pone.0029299, 2011.
Kämpf, J. and Chapman, P.: The Benguela Current Upwelling System, in: Upwelling Systems of the World, Springer, https://doi.org/10.1007/978-3-319-42524-5_7, 2016.
Lacroix, F., Ilyina, T., Laruelle, G. G., and Regnier, P.: Reconstructing the Preindustrial Coastal Carbon Cycle Through a Global Ocean Circulation Model: Was the Global Continental Shelf Already Both Autotrophic and a CO2 Sink?, Global Biogeochem. Cy., 35, e2020GB006603, https://doi.org/10.1029/2020GB006603, 2021.
Lahajnar, N., Andrae, A., Beier, S., Heinatz, K., Hirschmann, S., Meiritz, L., Mertens, C., Rose, J., Sabbaghzadeh, B., Schmidt, M., Stake, J., Stiehler, J., and Witting, P. J.: Mooring Rescue, Cruise No. SO283, 19 March 2021–25 May 2021, Emden (Germany) – Emden (Germany), in: SONNE-Berichte, Gutachterpanel Forschungsschiffe, Bonn2510-764X, 1–57, https://doi.org/10.48433/cr_so283, 2021.
Lamont, T., Hutchings, L., van den Berg, M. A., Goschen, W. S., and Barlow, R. G.: Hydrographic variability in the St. Helena Bay region of the southern Benguela ecosystem, J. Geophys. Res.-Oceans, 120, 2920–2944, https://doi.org/10.1002/2014JC010619, 2015.
Laufkötter, C. and Gruber, N.: Will marine productivity wane?, Science, 359, 1103–1104, https://doi.org/10.1126/science.aat0795, 2018.
Laufkötter, C., John, J. G., Stock, C. A., and Dunne, J. P.: Temperature and oxygen dependence of the remineralization of organic matter, Global Biogeochem. Cy., 31, 1038–1050, https://doi.org/10.1002/2017GB005643, 2017.
Le Moigne, F. A. C.: Pathways of Organic Carbon Downward Transport by the Oceanic Biological Carbon Pump, Frontiers in Marine Science, 6, 634, https://doi.org/10.3389/fmars.2019.00634, 2019.
Lee, C., Wakeham, S. G., and Hedges, J. I.: The Measurement of Oceanic Particle Flux – Are “Swimmers” A Problem?, Oceanography, 34–36, 1988.
Lee, C., Hedges, J., and Wakeham, S.: Technical problems with the use of sediment traps - preservation, swimmers, and leaching, in: Symposium Proceeedings – Sediment trap studies in the nordic countries (Vol. 2, pp. 36–48), edited by: Wassmann, P., Heiskanen, A.-S., and Lindahl, O., Kristineberg Marine Biological Station, Nurmijavi, ISBN-952-90-2844-X, 1991.
Louw, D. C., van der Plas, A. K., Mohrholz, V., Wasmund, N., Junker, T., and Eggert, A.: Seasonal and interannual phytoplankton dynamics and forcing mechanisms in the Northern Benguela upwelling system, J. Marine Syst., 157, 124–134, https://doi.org/10.1016/j.jmarsys.2016.01.009, 2016.
Lovelock, C. E. and Duarte, C. M.: Dimensions of Blue Carbon and emerging perspectives, Biol. Letters, 15, 20180781, https://doi.org/10.1098/rsbl.2018.0781, 2019.
Lutz, M. J., Caldeira, K., Dunbar, R. B., and Behrenfeld, M. J.: Seasonal rhythms of net primary production and particulate organic carbon flux to depth describe the efficiency of biological pump in the global ocean, J. Geophys. Res.-Oceans, 112, C10011, https://doi.org/10.1029/2006jc003706, 2007.
Macreadie, P. I., Anton, A., Raven, J. A., Beaumont, N., Connolly, R. M., Friess, D. A., Kelleway, J. J., Kennedy, H., Kuwae, T., Lavery, P. S., Lovelock, C. E., Smale, D. A., Apostolaki, E. T., Atwood, T. B., Baldock, J., Bianchi, T. S., Chmura, G. L., Eyre, B. D., Fourqurean, J. W., Hall-Spencer, J. M., Huxham, M., Hendriks, I. E., Krause-Jensen, D., Laffoley, D., Luisetti, T., Marbà, N., Masque, P., McGlathery, K. J., Megonigal, J. P., Murdiyarso, D., Russell, B. D., Santos, R., Serrano, O., Silliman, B. R., Watanabe, K., and Duarte, C. M.: The future of Blue Carbon science, Nat. Commun., 10, 3998, https://doi.org/10.1038/s41467-019-11693-w, 2019.
Martin, J. H., Knauer, G. A., Karl, D. M., and Broenkow, W. W.: VERTEX: carbon cycling in the northeast Pacific, Deep Sea Research, 34, 267–285, 1987.
McCartney, M. S.: Subantarctic Mode Water, in: A Voyage of Discovery: George Deacon 70th Anniversary Volume, edited by: Angel, M. V., Supplement to Deep-Sea Research, Pergamon Press, Oxford, UK, 103–119, 1977.
Meiritz, L. C., Rixen, T., van der Plas, A. K., Lamont, T., and Lahajnar, N.: Biogeochemical particle flux results of drifting sediment trap systems from the northern and southern Benguela Upwelling System between 2019 and 2021, PANGAEA [data set], https://doi.org/10.1594/PANGAEA.968894, 2024a.
Meiritz, L. C., Rixen, T., van der Plas, A. K., Lamont, T., and Lahajnar, N.: Biogeochemical particle flux results of moored sediment trap systems from two long term mooring positions in the northern and southern Benguela Upwelling System between 2009 and 2023, PANGAEA [data set], https://doi.org/10.1594/PANGAEA.968901, 2024b.
Metfies, K., Bauerfeind, E., Wolf, C., Sprong, P., Frickenhaus, S., Kaleschke, L., Nicolaus, A., and Nöthig, E. M.: Protist Communities in Moored Long-Term Sediment Traps (Fram Strait, Arctic)-Preservation with Mercury Chloride Allows for PCR-Based Molecular Genetic Analyses, Frontiers in Marine Science, 4, 301, https://doi.org/10.3389/fmars.2017.00301, 2017.
Miles, M.: The Biological Carbon Pump: Climate Change Warrior, Berkeley Scientific Journal, 23, 47–49, https://escholarship.org/uc/item/7cg4n7p8 (last access: 1 October 2024), 2018.
Mohrholz, V., Bartholomaeb, C. H., and van der Plas, A. K.: The seasonal variability of the northern Benguela undercurrent and its relation to the oxygen budget on the shelf, Cont. Shelf Res., 28, 424–441, 2008.
Monteiro, P. M. S., Nelson, G., van der Plas, A., Mabille, E., Bailey, G. W., and Klingelhoeffer, E.: Internal tide—shelf topography interactions as a forcing factor governing the large-scale distribution and burial fluxes of particulate organic matter (POM) in the Benguela upwelling system, Cont. Shelf Res., 25, 1864–1876, https://doi.org/10.1016/j.csr.2005.06.012, 2005.
Monteiro, P. M. S., van der Plas, A., Mohrholz, V., Mabille, E., Pascall, A., and Joubert, W.: Variability of natural hypoxia and methane in a coastal upwelling system: Oceanic physics or shelf biology?, Geophys. Res. Lett., 33, L16614, https://doi.org/10.1029/2006GL026234, 022006, 2006.
Monteiro, P. M. S., Dewitte, B., Scranton, M. I., Paulmier, A., and van der Plas, A. K.: The role of open ocean boundary forcing on seasonal to decadal-scale variability and long-term change of natural shelf hypoxia, Environ. Res. Lett., 6, 025002, https://doi.org/10.1088/1748-9326/6/2/025002, 2011.
Nagel, B., Emeis, K.-C., Flohr, A., Rixen, T., Schlarbaum, T., Mohrholz, V., and van der Plas, A.: N-cycling and balancing of the N-deficit generated in the oxygen minimum zone over the Namibian shelf—An isotope-based approach, J. Geophys. Res.-Biogeo., 118, 361–371, https://doi.org/10.1002/jgrg.20040, 2013.
Nagel, B., Gaye, B., Lahajnar, N., Struck, U., and Emeis, K.-C.: Effects of current regimes and oxygenation on particulate matter preservation on the Namibian shelf: Insights from amino acid biogeochemistry, Mar. Chem., 186, 121–132, https://doi.org/10.1016/j.marchem.2016.09.001, 2016.
Nowicki, M., DeVries, T., and Siegel, D. A.: Quantifying the Carbon Export and Sequestration Pathways of the Ocean's Biological Carbon Pump, Global Biogeochem. Cy., 36, e2021GB007083, https://doi.org/10.1029/2021GB007083, 2022.
Ocean Productivity: http://www.science.oregonstate.edu/ocean.productivity/, last access: 20 November 2024a.
Ocean Productivity: Online Data: Standard VGPM, http://orca.science.oregonstate.edu/1080.by.2160.monthly.hdf.vgpm.v.chl.v.sst.php, last access: 20 November 2024b.
Ohde, T. and Dadou, I.: Seasonal and annual variability of coastal sulphur plumes in the northern Benguela upwelling system, PLOS ONE, 13, e0192140, https://doi.org/10.1371/journal.pone.0192140, 2018.
Ohde, T., Siegel, H., Reißmann, J., and Gerth, M.: Identification and investigation of sulphur plumes along the Namibian coast using the MERIS sensor, Cont. Shelf Res., 27, 744–756, 2007.
Paropkari, A. L., Babu, C. P., and Mascarenhas, A.: New evidence for enhanced preservation of organic carbon in contact with oxygen minimum zone on the western continental slope of India, Mar. Geol., 111, 7–13, 1993.
Passow, U. and Carlson, C. A.: The biological pump in a high CO2 world, Mar. Ecol. Prog. Ser., 470, 249–271, 2012.
Pauly, D. and Christensen, V.: Primary production required to sustain global fisheries, Nature, 374, 255–257, 1995.
Pendleton, L., Donato, D. C., Murray, B. C., Crooks, S., Jenkins, W. A., Sifleet, S., Craft, C., Fourqurean, J. W., Kauffman, J. B., Marbà, N., Megonigal, P., Pidgeon, E., Herr, D., Gordon, D., and Baldera, A.: Estimating Global “Blue Carbon” Emissions from Conversion and Degradation of Vegetated Coastal Ecosystems, PLoS ONE, 7, e43542, https://doi.org/10.1371/journal.pone.0043542, 2012.
Pitcher, G. C. and Probyn, T. A.: Anoxia in southern Benguela during the autumn of 2009 and its linkage to a bloom of the dinoflagellate Ceratium balechii, Harmful Algae, 11, 23–32, https://doi.org/10.1016/j.hal.2011.07.001, 2011.
Pitcher, G. C., Probyn, T. A., du Randt, A., Lucas, A. J., Bernard, S., Evers-King, H., Lamont, T., and Hutchings, L.: Dynamics of oxygen depletion in the nearshore of a coastal embayment of the southern Benguela upwelling system, J. Geophys. Res.-Oceans, 119, 2183–2200, https://doi.org/10.1002/2013JC009443, 2014.
Reynolds, B., Rayner, N. A., Smith, T. M., Stokes, D. C., and Wang, W.: An improved insitu and satellite SST analysis for climate, J. Climate, 15, 1609–1625, 2002.
Riebesell, U., Schulz, K. G., Bellerby, R. G. J., Botros, M., Fritsche, P., Meyerhofer, M., Neill, C., Nondal, G., Oschlies, A., Wohlers, J., and Zollner, E.: Enhanced biological carbon consumption in a high CO2 ocean, Nature, 450, 545–548, 2007.
Rixen, T., Haake, B., Ittekkot, V., Guptha, M. V. S., Nair, R. R., and Schlüssel, P.: Coupling between SW monsoon-related surface and deep ocean processes as discerned from continuous particle flux meausurements and correlated satellite data, J. Geophys. Res., 101, 28569–28582, 1996.
Rixen, T., Cowie, G., Gaye, B., Goes, J., do Rosário Gomes, H., Hood, R. R., Lachkar, Z., Schmidt, H., Segschneider, J., and Singh, A.: Reviews and syntheses: Present, past, and future of the oxygen minimum zone in the northern Indian Ocean, Biogeosciences, 17, 6051–6080, https://doi.org/10.5194/bg-17-6051-2020, 2020.
Rixen, T., Lahajnar, N., Lamont, T., Koppelmann, R., Martin, B., van Beusekom, J. E. E., Siddiqui, C., Pillay, K., and Meiritz, L.: Oxygen and Nutrient Trapping in the Southern Benguela Upwelling System, Frontiers in Marine Science, 8, 1–14, https://doi.org/10.3389/fmars.2021.730591, 2021a.
Rixen, T., Borowski, P., Duncan, S., Heinatz, K., Hirschmann, S., Horton, M., Hüge, F., Janßen, S., Jordan, T., Kaufmann, M., Kremer, K., Labis, E., Martin, B., Mayer, B., Meiritz, L., Paulus, E., Pinter, S., Plewka, J., Reule, N., Rommel, A., Schneider, T., Siddiqui, C., Springer, B., Stanbro, K., Stegeman, H., Wallschuss, S., Welsch, A., Wenzel, J., Witting, K., and Zankl, S.: Trophic Transfer Efficiency in the Benguela Current, Cruise No. SO285, August 20th–November 2nd 2021, Emden (Germany) – Emden (Germany), in: SONNE Berichte (SO285), Gutachterpanel Forschungsschiffe, Bonn2510-764X, 1–128, https://doi.org/10.48433/cr_so285, 2021b.
Rixen, T., Lahajnar, N., Lamont, T., Koppelmann, R., Martin, B., Meiritz, L., Siddiqui, C., and van der Plas, A. K.: Chapter 25 – The Marine Carbon Footprint: Challenges in the Quantification of the CO2 Uptake by the Biological Carbon Pump in the Benguela Upwelling System, in: Sustainability of Southern African Ecosystems under Global Change, edited by: von Maltitz, G. P., Midgley, G. F., Veitch, J., Brümmer, C., Rötter, R. P., Viehberg, F. A., and Veste, M., Springer Ecological Studies 248, 729–757, ISBN 978-3-031-10947-8, https://doi.org/10.1007/978-3-031-10948-5, 2024.
Rubio, A., Blanke, B., Speich, S., Grima, N., and Roy, C.: Mesoscale eddy activity in the southern Benguela upwelling system from satellite altimetry and model data, Prog. Oceanogr., 83, 288–295, https://doi.org/10.1016/j.pocean.2009.07.029, 2009.
Schlitzer, R.: Ocean Data View, AWI, https://odv.awi.de (last access: 1 October 2024), 2024.
Sell, A. F., von Maltitz, G. P., Auel, H., Biastoch, A., Bode-Dalby, M., Brandt, P., Duncan, S. E., Ekau, W., Fock, H. O., Hagen, W., Huggett, J. A., Koppelmann, R., Körner, M., Lahajnar, N., Martin, B., Midgley, G. F., Rixen, T., van der Lingen, C. D., Verheye, H. M., and Wilhelm, M. R.: Chapter 2 – Unique Southern African Terrestrial and Oceanic Biomes and Their Relation to Steep Environmental Gradients, in: Sustainability of Southern African Ecosystems under Global Change, edited by: von Maltitz, G. P., Midgley, G. F., Veitch, J., Brümmer, C., Rötter, R. P., Viehberg, F. A., and Veste, M., Springer Ecological Studies 248, 23–88, ISBN 978-3-031-10947-8, https://doi.org/10.1007/978-3-031-10948-5, 2024.
Shannon, L. V. and Nelson, G.: The Benguela: Large Scale Features and Processes and System Variability, in: The South Atlantic: Present and Past Circulation, edited by: Wefer, G., Berger, W. H., Siedler, G., and Webb, D. J., Springer Berlin Heidelberg, Berlin, Heidelberg, https://doi.org/10.1007/978-3-642-80353-6_9, 163–210, 1996.
Shannon, L. V. and O'Tool, M. J.: Sustainability of the Benguela: ex Africa semper aliquid novi, in: Large Marine Ecosystems of the World: Trends in Exploitation, Protection and Research, edited by: Hempel, G. and Sherman, K., Elsevier Science, Amsterdam, the Netherlands, 227–253, ISBN 0444510273, 2003.
Shillington, F. A., Reason, C. J. C., Duncombe Rae, C. M., Florenchie, P., and Penven, P.: Large scale physical variability of the Benguela Current Large Marine Ecosystem (BCLME), in: Benguela: Predicting a large marine ecosystem, edited by: Shannon, L. J., Hempel, G., Malanotte-Rizzoli, P., Moloney, C. L., and Woods, J., Elsevier, Amsterdam, 49–70, https://doi.org/10.1016/S1570-0461(06)80009-1, 2006.
Siddiqui, C., Rixen, T., Lahajnar, N., Van der Plas, A. K., Louw, D. C., Lamont, T., and Pillay, K.: Regional and global impact of CO2 uptake in the Benguela Upwelling System through preformed nutrients, Nat. Commun., 14, 2582, https://doi.org/10.1038/s41467-023-38208-y, 2023.
Steinberg, D. K. and Landry, M. R.: Zooplankton and the Ocean Carbon Cycle, Annu. Rev. Mar. Sci., 9, 413–444, https://doi.org/10.1146/annurev-marine-010814-015924, 2017.
Stramma, L., Johnson, G. C., Sprintall, J., and Mohrholz, V.: Expanding oxygen-minimum zones in the tropical oceans, Science, 320, 655–658, https://doi.org/10.1126/science.1153847, 2008.
Stramma, L., Prince, E. D., Schmidtko, S., Luo, J., Hoolihan, J. P., Visbeck, M., Wallace, D. W. R., Brandt, P., and Kortzinger, A.: Expansion of oxygen minimum zones may reduce available habitat for tropical pelagic fishes, Nat. Clim. Change, 2, 33–37, http://www.nature.com/nclimate/journal/v2/n1/abs/nclimate1304.html#supplementary-information (last access: 1 October 2024), 2012.
Stukel, M. R., Irving, J. P., Kelly, T. B., Ohman, M. D., Fender, C. K., and Yingling, N.: Carbon sequestration by multiple biological pump pathways in a coastal upwelling biome, Nat. Commun., 14, 2024, https://doi.org/10.1038/s41467-023-37771-8, 2023.
Sydeman, W. J., García-Reyes, M., Schoeman, D. S., Rykaczewski, R. R., Thompson, S. A., Black, B. A., and Bograd, S. J.: Climate change and wind intensification in coastal upwelling ecosystems, Science, 345, 77–80, https://doi.org/10.1126/science.1251635, 2014.
Turner, J. T.: Zooplankton fecal pellets, marine snow, phytodetritus and the ocean's biological pump, Prog. Oceanogr., 130, 205–248, https://doi.org/10.1016/j.pocean.2014.08.005, 2015.
Tutasi, P. and Escribano, R.: Zooplankton diel vertical migration and downward C flux into the oxygen minimum zone in the highly productive upwelling region off northern Chile, Biogeosciences, 17, 455–473, https://doi.org/10.5194/bg-17-455-2020, 2020.
van der Plas, A. K., Monteiro, P. M. S., and Pascall, A.: Cross-shelf biogeochemical characteristics of sediments in the central Benguela and their relationship to overlying water column hypoxia, Afr. J. Mar. Sci., 29, 37–47, https://doi.org/10.2989/AJMS.2007.29.1.3.68, 2007.
von Maltitz, G. P., Midgley, G. F., Veitch, J., Brümmer, C., Rötter, R. P., Rixen, T., Brandt, P., Veste, M.: Chapter 32 – Synthesis and Outlook on Future Research and Scientific Education in Southern Africa, in: Sustainability of Southern African Ecosystems under Global Change, edited by: von Maltitz, G. P., Midgley, G. F., Veitch, J., Brümmer, C., Rötter, R. P., Viehberg, F. A., and Veste, M., Springer Ecological Studies 248, 933–964, ISBN 978-3-031-10947-8, https://doi.org/10.1007/978-3-031-10948-5, 2024.
Veitch, J., Penven, P., and Shillington, F.: The Benguela: A laboratory for comparative modeling studies, Prog. Oceanogr., 83, 296–302, https://doi.org/10.1016/j.pocean.2009.07.008, 2009.
Verheye, H. M., Lamont, T., Huggett, J. A., Kreiner, A., and Hampton, I.: Plankton productivity of the Benguela Current Large Marine Ecosystem (BCLME), Environmental Development, 17, 75–92, https://doi.org/10.1016/j.envdev.2015.07.011, 2016.
Vorrath, M.-E., Lahajnar, N., Fischer, G., Libuku, V. M., Schmidt, M., and Emeis, K.-C.: Spatiotemporal variation of vertical particle fluxes and modelled chlorophyll a standing stocks in the Benguela Upwelling System, J. Marine Syst., 180, 59–75, https://doi.org/10.1016/j.jmarsys.2017.12.002, 2018.
Weldrick, C. K., Makabe, R., Mizobata, K., Moteki, M., Odate, T., Takao, S., Trebilco, R., and Swadling, K. M.: The use of swimmers from sediment traps to measure summer community structure of Southern Ocean pteropods, Polar Biology, 44, 457–472, https://doi.org/10.1007/s00300-021-02809-4, 2021.
Short summary
Moored and drifting sediment trap experiments in the northern (nBUS) and southern (sBUS) Benguela Upwelling System showed that active carbon fluxes by vertically migrating zooplankton were about 3 times higher in the sBUS than in the nBUS. Despite these large variabilities, the mean passive particulate organic carbon (POC) fluxes were almost equal in the two subsystems. The more intense near-bottom oxygen minimum layer seems to lead to higher POC fluxes and accumulation rates in the nBUS.
Moored and drifting sediment trap experiments in the northern (nBUS) and southern (sBUS)...
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