Articles | Volume 5, issue 2
https://doi.org/10.5194/gchron-5-345-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-5-345-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
17 Aug 2023
Research article |
| 17 Aug 2023
Marine reservoir ages for coastal West Africa
Ifremer, Univ Brest, CNRS, Geo-Ocean UMR6538, 29280, Plouzané,
France
Philippe Maestrati
Muséum National d'Histoire Naturelle, Paris, DGD-Collections, France
Serge Gofas
Muséum National d'Histoire Naturelle, Paris, DGD-Collections, France
Departamento de Biología Animal, Facultad de Ciencias, Universidad de
Málaga, Málaga, Spain
Germain Bayon
Ifremer, Univ Brest, CNRS, Geo-Ocean UMR6538, 29280, Plouzané,
France
Fabien Dewilde
Ifremer, Univ Brest, CNRS, Geo-Ocean UMR6538, 29280, Plouzané,
France
Maylis Labonne
MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France
Bernard Dennielou
Ifremer, Univ Brest, CNRS, Geo-Ocean UMR6538, 29280, Plouzané,
France
Franck Ferraton
MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France
Giuseppe Siani
GEOPS, UMR 8148 Université Paris-Saclay, Orsay, France
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Cited articles
Alves, E. Q., Macario, K., Ascough, P., and Bronk Ramsey, C.: The worldwide
marine radiocarbon reservoir effect: Definitions, mechanisms, and prospects,
Rev. Geophys., 56, 278–305, https://doi.org/10.1002/2017RG000588, 2018.
Alves, E. Q., Macario, K. D., Urrutia, F. P., Cardoso, R. P., and Bronk
Ramsey, C.: Accounting for the marine reservoir effect in radiocarbon
calibration, Quaternary Sci. Rev., 209, 129–138,
https://doi.org/10.1016/j.quascirev.2019.02.013, 2019.
Arnold, J. R. and Anderson, E. C.: The distribution of Carbon-14 in nature,
Tellus, 9, 28–32, https://doi.org/10.1111/j.2153-3490.1957.tb01850.x, 1957.
Ascough, P., Cook, G., and Dugmore, A.: Methodological approaches to
determining the marine radiocarbon reservoir effect, Prog. Phys. Geogr.
Earth Environ., 29, 532–547, https://doi.org/10.1191/0309133305pp461ra,
2005.
Bard, E.: Correction of accelerator mass spectrometry 14C ages measured in
planktonic foraminifera: Paleoceanographic implications, Paleoceanography,
3, 635–645, https://doi.org/10.1029/PA003i006p00635, 1988.
Bard, E., Arnold, M., Mangerud, J., Paterne, M., Labeyrie, L., Duprat, J.,
Mélières, M.-A., Sønstegaard, E., and Duplessy, J.-C.: The North
Atlantic atmosphere-sea surface 14C gradient during the Younger Dryas
climatic event, Earth Planet. Sc. Lett., 126, 275–287,
https://doi.org/10.1016/0012-821X(94)90112-0, 1994.
Barton, E. D., Arıìstegui, J., Tett, P., Cantón, M., Garcıìa-Braun,
J., Hernández-León, S., Nykjaer, L., Almeida, C., Almunia, J.,
Ballesteros, S., Basterretxea, G., Escánez, J., Garcıìa-Weill, L.,
Hernández-Guerra, A., López-Laatzen, F., Molina, R., Montero, M. F.,
Navarro-Pérez, E., Rodrıìguez, J. M., van Lenning, K., Vélez, H.,
and Wild, K.: The transition zone of the Canary Current upwelling region,
Prog. Oceanogr., 41, 455–504,
https://doi.org/10.1016/S0079-6611(98)00023-8, 1998.
Boettger, C. R.: Zur Molluskenfauna des Kongogebiets, Ann. la
Société R. Zool. Malacol. Bel., 47, 89–117, 1912.
Boettger, O.: Katalog der Reptilien-Sammlung im Museum der Senckenbergischen
Naturforschenden Gesellschaft in Frankfurt am Main, II Teil (Schlangen),
Gebrüder Knauer, Frankfurt am Main, 1898.
Butzin, M., Köhler, P., and Lohmann, G.: Marine radiocarbon reservoir
age simulations for the past 50,000 years, Geophys. Res. Lett., 44,
8473–8480, https://doi.org/10.1002/2017GL074688, 2017.
Carré, M., Bentaleb, I., Blamart, D., Ogle, N., Cardenas, F., Zevallos,
S., Kalin, R. M., Ortlieb, L., and Fontugne, M.: Stable isotopes and
sclerochronology of the bivalve Mesodesma donacium: Potential application to
Peruvian paleoceanographic reconstructions, Palaeogeogr. Palaeocl., 228, 4–25, https://doi.org/10.1016/j.palaeo.2005.03.045, 2005.
Catry, T., Figueira, P., Carvalho, L., Monteiro, R., Coelho, P.,
Lourenço, P. M., Catry, P., Tchantchalam, Q., Catry, I., Botelho, M. J.,
Pereira, E., Granadeiro, J. P., and Vale, C.: Evidence for contrasting
accumulation pattern of cadmium in relation to other elements in Senilia
senilis and Tagelus adansoni from the Bijagós archipelago,
Guinea-Bissau, Environ. Sci. Pollut. Res., 24, 24896–24906,
https://doi.org/10.1007/s11356-017-9902-8, 2017.
Cheggour, M., Chafik, A., Langston, W., Burt, G., Benbrahim, S., and
Texier, H.: Metals in sediments and the edible cockle Cerastoderma edule
from two Moroccan Atlantic lagoons: Moulay Bou Selham and Sidi Moussa,
Environ. Pollut., 115, 149–160,
https://doi.org/10.1016/S0269-7491(01)00117-8, 2001.
Cottereau, E., Arnold, M., Moreau, C., Baqué, D., Bavay, D., Caffy, I.,
Comby, C., Dumoulin, J.-P., Hain, S., Perron, M., Salomon, J., and Setti,
V.: Artemis, the new 14C AMS at LMC14 in Saclay, France, Radiocarbon, 49,
291–299, https://doi.org/10.1017/S0033822200042211, 2007.
Coynel, A., Seyler, P., Etcheber, H., Meybeck, M., and Orange, D.: Spatial
and seasonal dynamics of total suspended sediment and organic carbon species
in the Congo River, Global Biogeochem. Cy., 19, GB4019,
https://doi.org/10.1029/2004GB002335, 2005.
Craig, H.: The natural distribution of radiocarbon and the exchange time of
carbon dioxide between atmosphere and sea, Tellus, 9, 1–17,
https://doi.org/10.1111/j.2153-3490.1957.tb01848.x, 1957.
Cropper, T. E., Hanna, E., and Bigg, G. R.: Spatial and temporal seasonal
trends in coastal upwelling off Northwest Africa, 1981–2012, Deep-Sea Res.
Pt. I, 86, 94–111,
https://doi.org/10.1016/j.dsr.2014.01.007, 2014.
Dautzenberg, P.: Mission Gruvel sur la côte occidentale d'Afrique
(1909–1910): Mollusques marins. Annales de l'Institut Océanographique,
Paris (Nouvelle Série), 5, 1–111, 1912.
Dewar, G., Reimer, P. J., Sealy, J., and Woodborne, S.: Late-Holocene marine
radiocarbon reservoir correction (ΔR) for the west coast of South
Africa, Holocene, 22, 1481–1489,
https://doi.org/10.1177/0959683612449755, 2012.
Dumoulin, J.-P., Comby-Zerbino, C., Delqué-Količ, E., Moreau, C.,
Caffy, I., Hain, S., Perron, M., Thellier, B., Setti, V., Berthier, B., and
Beck, L.: Status report on sample preparation protocols developed at the
LMC14 laboratory, Saclay, France: From Sample Collection to 14C AMS
Measurement, Radiocarbon, 59, 713–726,
https://doi.org/10.1017/RDC.2016.116, 2017.
Fontugne, M., Carré, M., Bentaleb, I., Julien, M., and Lavallée, D.:
Radiocarbon reservoir age variations in the south Peruvian upwelling during
the Holocene, Radiocarbon, 46, 531–537,
https://doi.org/10.1017/S003382220003558X, 2004.
Forman, S.: A review of postglacial emergence on Svalbard, Franz Josef Land
and Novaya Zemlya, northern Eurasia, Quaternary Sci. Rev., 23, 1391–1434,
https://doi.org/10.1016/j.quascirev.2003.12.007, 2004.
Freudenthal, T., Neuer, S., Meggers, H., Davenport, R., and Wefer, G.:
Influence of lateral particle advection and organic matter degradation on
sediment accumulation and stable nitrogen isotope ratios along a
productivity gradient in the Canary Islands region, Mar. Geol., 177,
93–109, https://doi.org/10.1016/S0025-3227(01)00126-8, 2001.
Heaton, T. J., Köhler, P., Butzin, M., Bard, E., Reimer, R. W., Austin,
W. E. N., Bronk Ramsey, C., Grootes, P. M., Hughen, K. A., Kromer, B.,
Reimer, P. J., Adkins, J., Burke, A., Cook, M. S., Olsen, J., and Skinner,
L. C.: Marine20 – The Marine Radiocarbon Age Calibration Curve (0–55 000 cal BP), Radiocarbon, 62, 779–820, https://doi.org/10.1017/RDC.2020.68,
2020.
Heaton, T. J., Bard, E., Bronk Ramsey, C., Butzin, M., Köhler, P.,
Muscheler, R., Reimer, P. J., and Wacker, L.: Radiocarbon: A key tracer for
studying Earth's dynamo, climate system, carbon cycle, and Sun, Science, 374, 6568, eabd7096, https://doi.org/10.1126/science.abd7096, 2021.
Heaton, T. J., Bard, E., Bronk Ramsey, C., Butzin, M., Hatté, C.,
Hughen, K. A., Köhler, P., and Reimer, P. J.: A response to community
questions on the Marine20 radiocarbon age calibration curve: Marine
reservoir ages and the calibration of 14C samples from the oceans,
Radiocarbon, 65, 247–273, https://doi.org/10.1017/RDC.2022.66, 2023.
Herrera, N. D., ter Poorten, J. J., Bieler, R., Mikkelsen, P. M., Strong, E.
E., Jablonski, D., and Steppan, S. J.: Molecular phylogenetics and
historical biogeography amid shifting continents in the cockles and giant
clams (Bivalvia: Cardiidae), Mol. Phylogenet. Evol., 93, 94–106,
https://doi.org/10.1016/j.ympev.2015.07.013, 2015.
Hogg, A. G., Heaton, T. J., Hua, Q., Palmer, J. G., Turney, C. S., Southon,
J., Bayliss, A., Blackwell, P. G., Boswijk, G., Bronk Ramsey, C., Pearson,
C., Petchey, F., Reimer, P., Reimer, R., and Wacker, L.: SHCal20 Southern
Hemisphere Calibration, 0–55,000 Years cal BP, Radiocarbon, 62, 759–778,
https://doi.org/10.1017/RDC.2020.59, 2020.
Huntley, J. W., De Baets, K., Scarponi, D., Linehan, L. C., Epa, Y. R.,
Jacobs, G. S., and Todd, J. A.: Bivalve mollusks as hosts in the fossil
record, in: The Evolution and Fossil Record of Parasitism, edited by: De
Baets, K. and Huntley, J. W., Springer International Publishing, 251–287,
https://doi.org/10.1007/978-3-030-52233-9_8, 2021.
Jones, K. B., Hodgins, G. W., Dettman, D. L., Andrus, C. F. T., Nelson, A., and Etayo-Cadavid, M. F.: Seasonal variations in Peruvian marine reservoir age from pre-bomb Argopecten purpuratus shell carbonate, Radiocarbon, 49, 877–888,
https://doi.org/10.1017/S0033822200042740, 2007.
Jones, K. B., Hodgins, G. W., Etayo-Cadavid, M. F., Andrus, C. F. T., and Sandweiss, D. H.: Centuries of marine radiocarbon reservoir age variation within archaeological Mesodesma donacium shells from southern Peru, Radiocarbon, 52, 1207–1214,
https://doi.org/10.1017/S0033822200046282, 2010.
Kennett, D. J., Ingram, B. L., Erlandson, J. M., and Walker, P.: Evidence
for Temporal Fluctuations in Marine Radiocarbon Reservoir Ages in the Santa
Barbara Channel, Southern California, J. Archaeol. Sci., 24, 1051–1059,
https://doi.org/10.1006/jasc.1996.0184, 1997.
Kennett, D. J., Lynn Ingram, B., Southon, J. R., and Wise, K.: Differences
in 14C age between stratigraphically associated charcoal and marine shell
from the Archaic Period Site of Kilometer 4, Southern Peru: Old wood or old
water?, Radiocarbon, 44, 53–58, https://doi.org/10.1017/S0033822200064663,
2002.
Köhler, P. and Fischer, H.: Simulating changes in the terrestrial
biosphere during the last glacial/interglacial transition, Glob. Planet.
Change, 43, 33–55, https://doi.org/10.1016/j.gloplacha.2004.02.005, 2004.
Köhler, P. and Fischer, H.: Simulating low frequency changes in
atmospheric CO2 during the last 740 000 years, Clim. Past, 2, 57–78,
https://doi.org/10.5194/cp-2-57-2006, 2006.
Köhler, P., Fischer, H., Munhoven, G., and Zeebe, R. E.: Quantitative
interpretation of atmospheric carbon records over the last glacial
termination, Global Biogeochem. Cy., 19, GB4020,
https://doi.org/10.1029/2004GB002345, 2005.
Köhler, P., Muscheler, R., and Fischer, H.: A model-based interpretation
of low-frequency changes in the carbon cycle during the last 120 000 years
and its implications for the reconstruction of atmospheric Δ14C,
Geochem. Geophy. Geosy., 7, Q11N06,
https://doi.org/10.1029/2005GC001228, 2006.
Lambert, T., Darchambeau, F., Bouillon, S., Alhou, B., Mbega, J.-D.,
Teodoru, C. R., Nyoni, F. C., Massicotte, P., and Borges, A. V.: Landscape
control on the spatial and temporal variability of chromophoric dissolved
organic matter and dissolved organic carbon in large African Rivers,
Ecosystems, 18, 1224–1239, https://doi.org/10.1007/s10021-015-9894-5, 2015.
Lindsay, C. M., Lehman, S. J., Marchitto, T. M., Carriquiry, J. D., and
Ortiz, J. D.: New constraints on deglacial marine radiocarbon anomalies from
a depth transect near Baja California, Paleoceanography, 31, 1103–1116,
https://doi.org/10.1002/2015PA002878, 2016.
Lougheed, B. C., Filipsson, H. L., and Snowball, I.: Large spatial
variations in coastal 14C reservoir age – a case study from the Baltic Sea,
Clim. Past, 9, 1015–1028, https://doi.org/10.5194/cp-9-1015-2013, 2013.
Lourenço, C. R., Nicastro, K. R., McQuaid, C. D., Krug, L. A., and
Zardi, G. I.: Strong upwelling conditions drive differences in species
abundance and community composition along the Atlantic coasts of Morocco and
Western Sahara, Mar. Biodivers., 50, 15,
https://doi.org/10.1007/s12526-019-01032-z, 2020.
Manaan, M.: Étude sédimentologique du remplissage de la lagune de
Sidi Moussa, Maroc, PhD thesis, Université Chouaib Doukkali, El Jadida,
https://theses.hal.science/tel-00124571 (last access: 8 August 2023), 2003.
Martins, M. S. and Stammer, D.: Interannual variability of the Congo River
plume-induced sea surface salinity, Remote Sens., 14, 1013,
https://doi.org/10.3390/rs14041013, 2022.
Marwick, T. R., Tamooh, F., Teodoru, C. R., Borges, A. V., Darchambeau, F.,
and Bouillon, S.: The age of river-transported carbon: A global perspective,
Global Biogeochem. Cy., 29, 122–137,
https://doi.org/10.1002/2014GB004911, 2015.
Milliman, J. D. and Farnsworth, K. L.: River discharge to the coastal ocean,
Cambridge University Press, https://doi.org/10.1017/CBO9780511781247, 2011.
Monge Soares, A.: The 14C content of marine shells: Evidence for variability
in coastal upwelling off Portugal during the Holocene, in: Isotope
techniques in the study of past and current environmental changes in the
hydrosphere and the atmosphere proceedings, edited by: IAEA, Vienna,
471–485, ISBN 92-0-103293-5, 1993.
Monge Soares, A. M. and Alveirinho Dias, J. M.: Coastal upwelling and
radiocarbon-evidence for temporal fluctuations in ocean reservoir effect off
portugal during the holocene, Radiocarbon, 48, 45–60,
https://doi.org/10.1017/S0033822200035384, 2006.
Mook, W. G. and van der Plicht, J.: Reporting 14C activities and
concentrations, Radiocarbon, 41, 227–239,
https://doi.org/10.1017/S0033822200057106, 1999.
Moreau, C., Caffy, I., Comby, C., Delqué-Količ, E., Dumoulin, J.-P.,
Hain, S., Quiles, A., Setti, V., Souprayen, C., Thellier, B., and Vincent,
J.: Research and development of the Artemis 14C AMS facility: Status report,
Radiocarbon, 55, 331–337, https://doi.org/10.1017/S0033822200057441, 2013.
Ndeye, M.: Marine reservoir ages in Northern Senegal and Mauritania coastal
waters, Radiocarbon, 50, 281–288,
https://doi.org/10.1017/S0033822200033580, 2008.
Okera, W.: Observations on some population parameters of exploited stocks of
Senilia senilis (= Arca senilis) in Sierra Leone, Mar. Biol., 38, 217–229,
https://doi.org/10.1007/BF00388935, 1976.
Oliver, P. G. and von Cosel, R.: Taxonomy of tropical west African Bivalves.
IV. Arcidae., Bull. Muséum Natl. d'Histoire Nat., 14, 293–381, 1992.
Reimer, P. J. and McCormac, F. G.: Marine radiocarbon reservoir corrections
for the Mediterranean and Aegean Seas, Radiocarbon, 44, 159–166,
https://doi.org/10.1017/S0033822200064766, 2002.
Reimer, P. J. and Reimer, R. W.: A marine reservoir correction database and
on-line interface, Radiocarbon, 43, 461–463,
https://doi.org/10.1017/S0033822200038339, 2001.
Reimer, P. J., Brown, T. A., and Reimer, R. W.: Discussion: Reporting and
calibration of post-bomb 14C data, Radiocarbon, 46, 1299–1304,
https://doi.org/10.1017/S0033822200033154, 2004.
Reimer, P. J., Austin, W. E. N., Bard, E., Bayliss, A., Blackwell, P. G.,
Bronk Ramsey, C., Butzin, M., Cheng, H., Edwards, R. L., Friedrich, M.,
Grootes, P. M., Guilderson, T. P., Hajdas, I., Heaton, T. J., Hogg, A. G.,
Hughen, K. A., Kromer, B., Manning, S. W., Muscheler, R., Palmer, J. G.,
Pearson, C., van der Plicht, J., Reimer, R. W., Richards, D. A., Scott, E.
M., Southon, J. R., Turney, C. S. M., Wacker, L., Adolphi, F., Büntgen,
U., Capano, M., Fahrni, S. M., Fogtmann-Schulz, A., Friedrich, R.,
Köhler, P., Kudsk, S., Miyake, F., Olsen, J., Reinig, F., Sakamoto, M.,
Sookdeo, A., and Talamo, S.: The IntCal20 northern hemisphere radiocarbon
age calibration curve (0–55 cal kBP), Radiocarbon, 62, 725–757,
https://doi.org/10.1017/RDC.2020.41, 2020.
Reimer, R. W. and Reimer, P. J.: An online application for ΔR
calculation, Radiocarbon, 59, 1623–1627,
https://doi.org/10.1017/RDC.2016.117, 2017.
Revelle, R. and Suess, H. E.: Carbon dioxide exchange between atmosphere and
ocean and the question of an increase of atmospheric CO2 during the past
decades, Tellus, 9, 18–27,
https://doi.org/10.1111/j.2153-3490.1957.tb01849.x, 1957.
Richey, J. E., Spencer, R. G. M., Drake, T. W., and Ward, N. D.: Fluvial carbon dynamics across the land to ocean continuum of great tropical rivers, in: Congo Basin Hydrology, Climate, and Biogeochemistry: A Foundation for the Future, edited by Raphael M. Tshimanga, Guy D. Moukandi N'kaya, Douglas Alsdorf, Wiley, 391–412, https://doi.org/10.1002/9781119657002.ch20, 2022.
Roux, C.: Compte rendu sommaire d'une mission en Afrique Équatoriale
Française, Bull. du Muséum Natl. d'Histoire Nat., 21, 500–503,
1949.
Santos, G. M., Southon, J. R., Griffin, S., Beaupre, S. R., and Druffel, E.
R. M.: Ultra small-mass AMS 14C sample preparation and analyses at
KCCAMS/UCI Facility, Nucl. Instrum. Method. Phys. Res. Sect. B, 259, 293–302,
https://doi.org/10.1016/j.nimb.2007.01.172, 2007.
Schefuß, E., Eglinton, T. I., Spencer-Jones, C. L., Rullkötter, J.,
De Pol-Holz, R., Talbot, H. M., Grootes, P. M., and Schneider, R. R.:
Hydrologic control of carbon cycling and aged carbon discharge in the Congo
River basin, Nat. Geosci., 9, 687–690, https://doi.org/10.1038/ngeo2778,
2016.
Sessa, J. A., Callapez, P. M., Dinis, P. A., and Hendy, A. J. W.:
Paleoenvironmental and paleobiogeographical implications of a middle
Pleistocene mollusc assemblage from the marine terraces of Baía Das
Pipas, southwest Angola, J. Paleontol., 87, 1016–1040,
https://doi.org/10.1666/12-119, 2013.
Siani, G., Paterne, M., Arnold, M., Bard, E., Métivier, B., Tisnerat,
N., and Bassinot, F.: Radiocarbon reservoir ages in the Mediterranean Sea
and Black Sea, Radiocarbon, 42, 271–280,
https://doi.org/10.1017/S0033822200059075, 2000.
Siani, G., Paterne, M., Michel, E., Sulpizio, R., Sbrana, A., Arnold, M.,
and Haddad, G.: Mediterranean Sea surface radiocarbon reservoir age changes
since the Last Glacial Maximum, Science, 294, 1917–1920,
https://doi.org/10.1126/science.1063649, 2001.
Siegenthaler, U.: Uptake of excess CO2 by an outcrop-diffusion model of the
ocean, J. Geophys. Res., 88, 3599, https://doi.org/10.1029/JC088iC06p03599,
1983.
Skinner, L., McCave, I. N., Carter, L., Fallon, S., Scrivner, A. E., and
Primeau, F.: Reduced ventilation and enhanced magnitude of the deep Pacific
carbon pool during the last glacial period, Earth Planet. Sc. Lett., 411,
45–52, https://doi.org/10.1016/j.epsl.2014.11.024, 2015.
Skinner, L. C. and Bard, E.: Radiocarbon as a dating tool and tracer in
paleoceanography, Rev. Geophys., 60, 1–64,
https://doi.org/10.1029/2020RG000720, 2022.
Skinner, L. C., Fallon, S., Waelbroeck, C., Michel, E., and Barker, S.:
Ventilation of the deep Southern Ocean and deglacial CO2 rise, Science, 328, 1147–1151, https://doi.org/10.1126/science.1183627, 2010.
Smith, D. A. S.: Polymorphism and population density in Donax rugosus
(Lamellibranchiata: Donacidae), J. Zool., 164, 429–441,
https://doi.org/10.1111/j.1469-7998.1971.tb01327.x, 1971.
Soulet, G.: Methods and codes for reservoir–atmosphere 14C age offset
calculations, Quat. Geochronol., 29, 97–103,
https://doi.org/10.1016/j.quageo.2015.05.023, 2015.
Soulet, G., Ménot, G., Garreta, V., Rostek, F., Zaragosi, S.,
Lericolais, G., and Bard, E.: Black Sea “Lake” reservoir age evolution
since the Last Glacial – Hydrologic and climatic implications, Earth
Planet. Sc. Lett., 308, 245–258,
https://doi.org/10.1016/j.epsl.2011.06.002, 2011.
Soulet, G., Skinner, L. C., Beaupré, S. R., and Galy, V.: A note on
reporting of reservoir 14C disequilibria and age offsets, Radiocarbon, 58,
205–211, https://doi.org/10.1017/RDC.2015.22, 2016.
Soulet, G., Giosan, L., Flaux, C., and Galy, V.: Using stable carbon
isotopes to quantify radiocarbon reservoir age offsets in the coastal black
sea, Radiocarbon, 61, 309–318, https://doi.org/10.1017/RDC.2018.61, 2019.
Southon, J., Kashgarian, M., Fontugne, M., Metivier, B., and Yim, W. W. S.:
Marine reservoir corrections for the Indian Ocean and Southeast Asia,
Radiocarbon, 44, 167–180, https://doi.org/10.1017/S0033822200064778, 2002.
Spencer, R. G. M., Stubbins, A., Hernes, P. J., Baker, A., Mopper, K.,
Aufdenkampe, A. K., Dyda, R. Y., Mwamba, V. L., Mangangu, A. M.,
Wabakanghanzi, J. N., and Six, J.: Photochemical degradation of dissolved
organic matter and dissolved lignin phenols from the Congo River, J.
Geophys. Res., 114, G03010, https://doi.org/10.1029/2009JG000968, 2009.
Spencer, R. G. M., Hernes, P. J., Aufdenkampe, A. K., Baker, A., Gulliver,
P., Stubbins, A., Aiken, G. R., Dyda, R. Y., Butler, K. D., Mwamba, V. L.,
Mangangu, A. M., Wabakanghanzi, J. N., and Six, J.: An initial investigation
into the organic matter biogeochemistry of the Congo River, Geochim.
Cosmochim. Ac., 84, 614–627, https://doi.org/10.1016/j.gca.2012.01.013,
2012.
Spencer, R. G. M., Hernes, P. J., Dinga, B., Wabakanghanzi, J. N., Drake, T.
W., and Six, J.: Origins, seasonality, and fluxes of organic matter in the
Congo River, Global Biogeochem. Cy., 30, 1105–1121,
https://doi.org/10.1002/2016GB005427, 2016.
Stuiver, M. and Braziunas, T. F.: Modeling atmospheric 14C influences and
14C ages of marine samples to 10 000 BC, Radiocarbon, 35, 137–189,
https://doi.org/10.1017/S0033822200013874, 1993.
Stuiver, M. and Polach, H. A.: Discussion: Reporting of 14C Data,
Radiocarbon, 19, 355–363, https://doi.org/10.1017/S0033822200003672, 1977.
Stuiver, M., Pearson, G. W., and Braziunas, T.: Radiocarbon age calibration
of marine samples back to 9000 cal yr BP, Radiocarbon, 28, 980–1021,
https://doi.org/10.1017/S0033822200060264, 1986.
Suess, H. E.: Radiocarbon concentration in modern wood, Science, 122,
415–417, https://doi.org/10.1126/science.122.3166.415.b, 1955.
Tans, P. P., De Jong, A. F. M., and Mook, W. G.: Natural atmospheric 14C
variation and the Suess effect, Nature, 280, 826–828,
https://doi.org/10.1038/280826a0, 1979.
Tisnérat-Laborde, N., Poupeau, J. J., Tannau, J. F., and Paterne, M.:
Development of a semi-automated system for routine preparation of carbonate
samples, Radiocarbon, 43, 299–304,
https://doi.org/10.1017/S0033822200038145, 2001.
Türkmen, A., Türkmen, M., and Tepe, Y.: Biomonitoring of heavy
metals from Iskenderun Bay using two bivalve species Chama pacifica
Broderip, 1834 and Ostrea stentina Payraudeau, 1826, Turkish J. Fish. Aquat.
Sci., 5, 107–111, 2005.
von Cosel, R. and Gofas, S.: Marine Bivalves of Tropical West Africa: From
Rio de Oro to Southern Angola, edited by: MNHN and IRD, Faune et Flore
tropicales, 48, Paris, Marseille, 1104 pp., ISBN 978-2-85653-888-3, 2019.
Westhoff, F.: Die Fauna der Kongo-Mündung, Jahresbericht der Zool. Sekt.
Westfälischen Prov. Vereins für Wiss. und Kunst für das
Etatsjahr 1885–1886, 38–40, 1886.
Williams, R. G. and Follows, M. J.: Ocean dynamics and the carbon cycle:
Principles and mechanisms, Cambridge, Cambridge, 434 pp., https://doi.org/10.1017/CBO9780511977817, 2011.
Short summary
The marine reservoir age (MRA) is the difference between the 14C age of the ocean and that of the atmosphere at a given time. In geochronology, knowing the local MRA is important to derive accurate calibrated ages for 14C-dated marine material. However, MRA values for coastal West Africa are scarce. From the 14C dating of known-age bivalves from museum collections, we calculated MRA values and populated the MRA dataset for coastal West Africa over a latitudinal transect from 33°N to 15°S.
The marine reservoir age (MRA) is the difference between the 14C age of the ocean and that of...
