Abstract
Land—ocean transfer of sediment and organic matter along the Moroccan Atlantic margin (NW Africa) seems to have been very effective during the last 130 ka. In a marine core from this region, we found total organic carbon (TOC) values ranging from 0.3 to 1.7 dry wt% of bulk sediments. These relatively high values are fairly unusual, as the core was recovered from an open-ocean environment that is currently oligotrophic. In order to explain this trend, more typical of an upwelling eutrophic setting, three processes were evaluated: (1) in situ primary production associated with the extension of the Cape Ghir upwelling filament, (2) bottom water conditions that may favour organic carbon preservation and (3) lateral organic carbon advection. The site occasionally experienced more eutrophic conditions, especially during termination I; here, we recorded a relative high abundance of the planktonic foraminifer Globigerina bulloides, suggesting high primary production. However, given the absence of correlation between TOC and G. bulloides records, high TOC storage cannot be attributed exclusively to primary production. Preservation factors such as bottom water ventilation are also ruled out. Lateral TOC advection seems to be the most plausible process. Today, lateral advection and offshore transport of nutrients and organic matter characterize the study region. However, the triggering mechanisms deserve further investigation. Different controlling factors influencing the mobilization and advection of organic carbon from coastal upwelling sites to the deep basin are discussed. The correlation found between down-core TOC and sea-level changes suggests sea-level fluctuations as the most effective mechanism driving nepheloid layer detachment and seaward material transport.
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References
Abrantes F (1991) Variability of upwelling off NW Africa during the latest Quaternary: diatom evidence. Paleoceanography 6(4):431–460
Abrantes F, Meggers H, Nave S, Bollman J, Palma S, Sprengel C, Henderiks J, Spies A, Salgueiro E, Moita T, Neuer S (2002) Fluxes of micro-organisms along a productivity gradient in the Canary Islands region (29°N): implications for paleoreconstructions. Deep-Sea Res II 49(17):3599–3629
Aït Hssaine A, Bridgland D (2009) Pliocene–Quaternary fluvial and aeolian records in the Souss Basin, southwest Morocco: a geomorphological model. Global Planet Change (in press) doi:10.1016/j.gloplacha.2009.03.002
Bé AWH (1977) An ecological zoogeographic and taxonomic review of recent planktonic foraminifera. In: Ramsay ATS (ed) Oceanic micropaleontology. Academic, London, pp 1–100
Bé AWH, Tolderlund DS (1971) Distribution and ecology of living planktonic foraminifera in surface waters of the Atlantic and Indian Oceans. In: Funnel BM, Riedel WR (eds) The micropaleontology of oceans. Cambridge University Press, London, pp 105–149
Berger WH, Smetacek V, Wefer G (1989) Productivity of the ocean: past and present. Life Sciences Research Report 44. Wiley, New York
Berger WH, Lange CB, Wefer G (2002) Upwelling history of the Benguela-Namibia system: a synthesis of Leg 175 results. In: Wefer G, Berger WH, Richter C (eds) Proc ODP Sci Results 175. Ocean Drilling Program, College Station, TX, pp 1–103
Bertrand P, Shimmield GB, Martinez P, Grousset FE, Jorissen F, Paterne M, Pujol C, Bouloubassi I, Buat-Ménard P, Peypouquet JP, Beaufort L, Sicre MA, Lallier-Verges E, Foster JM, Ternois Y, other participants of Sedorqua Program (1996) The glacial ocean productivity hypothesis: the importance of regional temporal and spatial studies. Mar Geol 130:1–9
Boyle EA, Keigwin LD (1982) Deep circulation of the North Atlantic over the last 200000 years: geochemical evidence. Science 218:784–787
Bozzano G, Kuhlmann H, Alonso B (2002) Storminess control over African dust input to the Moroccan Atlantic margin (NW Africa) at the time of maxima boreal summer insolation: a record of the last 220 kyr. Palaeogeogr Palaeoclimatol Palaeoecol 183:155–168
Cayre O, Lancelot Y, Vincent E, Hall MA (1999) Paleoceanographic reconstructions from planktonic foraminifera off the Iberian Margin: temperature salinity and Heinrich events. Paleoceanography 14(3):384–396
Crowley TJ (1983) Calcium-carbonate preservation patterns in the central North Atlantic during the last 150000 years. Mar Geol 51:1–14
Curry WB, Lohmann GP (1985) Carbon deposition rates and deep water residence time in the Equatorial Atlantic Ocean throughout the last 160000 years. In: Sundquist ET, Broecker WS (eds) The carbon cycle and atmospheric CO2: natural variation Archean to present. AGU, Geophys Monogr Ser 32:285–301
Curry WB, Lohmann GP (1990) Reconstructing past particle fluxes in the tropical Atlantic Ocean. Paleoceanography 5(4):487–505
Curry WB, Duplessy JC, Laberyie LD, Shackleton NJ (1988) Changes in the distribution of δ13C of deep water ΣCO2 between the last glaciation and the Holocene. Paleoceanography 3:317–341
Cutler KB, Edwards RL, Taylor FW, Cheng H, Adkins JF, Gallup CD, Cutler PM, Burr GS, Bloom AL (2003) Rapid sea-level fall and deep-ocean temperature change since the last interglacial period. Earth Planet Sci Lett 206:253–271
Davenport R, Neuer S, Hernández-Guerra A, Rueda MJ, Llinas O, Fischer G, Wefer G (1999) Seasonal and interannual pigment concentration in the Canary Islands region from CZCS data and comparison with observations from the ESTOC. Int J Remote Sensing 20(7):1419–1433
Davenport R, Neuer S, Helmke P, Perez-Marrero J, Llinas O (2002) Primary productivity in the northern Canary Islands region as inferred from Sea WiFS imagery. Deep-Sea Res II 49:3481–3496
Duplessy JC, Shackleton NJ, Fairbanks RG, Laberyie L, Oppo D, Kallel N (1988) Deepwater source variations during the last climatic cycle and their impact on the global deepwater circulation. Paleoceanography 3:343–360
Ercilla G, Alonso B, Perez-Belzuz F, Estrada F, Baraza J, Farran M, Canals M, Masson D (1998) Origin, sedimentary and depositional evolution of the Agadir turbidite system central eastern Atlantic. J Geol Soc Lond 155:929–939
Fagel N, Dehairs F, Peinert R, Antia A, Andre L (2004) Reconstructing export production at the NE Atlantic margin: potential and limits of the Ba proxy. Mar Geol 204:11–25
Freudenthal T, Neuer S, Meggers H, Davenport R, Wefer G (2001) 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
Freudenthal T, Meggers H, Henderiks J, Kuhlmann H, Moreno A, Wefer G (2002) Upwelling intensity and filament activity off Morocco during the last 250000 years. Deep-Sea Res II 49(17):3655–3674
Gabric AJ, García L, Van Camp L, Nykjær L, Eifler W, Schrimpf W (1993) Offshore export of shelf production in the Cape Blanc (Mauritania) giant filament as derived from coastal zone colour scanner imagery. J Geophys Res 98(C3):4697–4712
García-Muñoz M, Arístegui J, Pelegrí JL, Antoranz A, Ojeda A, Torres M (2005) Exchange of carbon by an upwelling filament off Cape Ghir (NW Africa). J Mar Syst 54:83–95
Giraudeau J (1993) Planktonic foraminiferal assemblages in surface sediments from the southwest African continental margin. Mar Geol 110:47–62
Gupta AK, Anderson DM, Overpeck JT (2003) Abrupt changes in the Asian southwest monsoon during the Holocene and their links to the North Atlantic Ocean. Nature 421:354–356
Hagen E, Zulicke C, Feistel R (1996) Near-surface structures in the Cape Ghir filament off Morocco. Oceanol Acta 19(6):577–598
Haynes R, Barton ED, Pilling I (1993) Development persistence and variability of upwelling filaments off the Atlantic coast of the Iberian Peninsula. J Geophys Res 98(C12):22681–22692
Hedges JI, Keil RG (1995) Sedimentary organic matter preservation: an assessment and speculative synthesis. Mar Chem 49:81–115
Hemleben C, Splinder M, Anderson OR (1989) Modern planktonic Foraminifera. Springer, Berlin Heidelberg New York
Honjo S, Spencer DW, Farrington JW (1982) Deep advective transport of lithogenic particles in Panama Basin. Science 216:516–518
Hooghiemstra H, Bechler A, Beug H-J (1987) Isopollen maps for 18000 yr BP of the Atlantic offshore of northwest Africa: evidence for paleo-wind circulation. Paleoceanography 2:561–582
Howard WR, Prell WL (1994) Late Quaternary CaCO3 production and preservation in the Southern Ocean: implications for oceanic and atmospheric carbon cycling. Paleoceanography 9:453–482
Jahnke RA, Shimmield GB (1995) Particle flux and its conversion to the sediment record: coastal ocean upwelling systems. In: Summerhayes CP, Emeis K-C, Angel MV, Smith RL, Zeitzschel B (eds) Upwelling in the ocean: modern processes and ancient records. Wiley, New York, pp 83–100
Jahnke RA, Reimers CE, Craven DB (1990) Intensification of recycling of organic matter at the sea floor near ocean margins. Nature 348:50–54
Jansen JHF, Van der Gaast SJ, Koster B, Vaars AJ (1998) CORTEX a shipboard XRF-scanner for element analyses in split sediment cores. Mar Geol 151:143–153
Jung M, Ilmberger J, Mangini A, Emeis KC (1997) Why some Mediterranean sapropels survived burn-down (and others did not). Mar Geol 141:51–60
Kasten S, Haese RR, Zabel M, Rühlemann C, Schulz H (2001) Barium peaks at glacial terminations in sediments of the equatorial Atlantic Ocean—relicts of deglacial productivity pulses? Chem Geol 175:635–651
Kennett JP, Srinivasan MS (1983) Neogene planktonic Foraminifera: a phylogenetic atlas. Hutchinson Ross, Stroudsburg, PA
Kostianoy AG, Zatsepin AG (1996) The West African coastal upwelling filaments and cross-frontal water exchange conditioned by them. J Mar Syst 7:349–359
Kroon D, Ganssen G (1989) Northern Indian Ocean upwelling cells and the stable isotope composition of living planktic foraminifers. Deep-Sea Res 36:1219–1236
Kuhlmann H, Freudenthal T, Helmke P, Meggers H (2004) Reconstruction of paleoceanography off NW Africa during the last 40, 000 years: influence of local and regional factors on sediment accumulation. Mar Geol 207:209–224
Luz B, Shackleton NJ (1975) CaCO3 solution in the tropical East Pacific during the past 130000 years. Cushman Fnd Foram Res Spec Publ 13:142–150
Marret F, Turon JL (1994) Paleohydrology and paleoclimatology off Northwest Africa during the last glacial-interglacial transition and the Holocene: palynological evidences. Mar Geol 118:107–117
Martinez P, Bertrand P, Shimmield GB, Cochrane K, Jorissen F, Foster JM, Dignan M (1999) Upwelling intensity and ocean productivity changes off Cape Blanc (northwest Africa) during the last 70000 years: geochemical and micropaleontological evidence. Mar Geol 158:57–74
McCave IN (2002) Sedimentary settings on continental margins—an overview. In: Wefer G, Billet D, Hebbeln D, Jörgensen BB, Schlüter M, van Weering T (eds) Ocean margin systems. Springer, Berlin Heidelberg New York, pp 1–14
McCave IN, Hall IR, Antia AN, Chou L, Dehairs F, Lampitt RS, Thomsen L, van Weering TCE, Wollast R (2001) Distribution composition and flux of particulate material over the European margin at 47°–50°N. Deep-Sea Res II 48:3107–3139
Meggers H, Freudenthal T, Nave S, Targarona J, Abrantes F, Helmke P (2002) Assessment of geochemical and micropaleontological sedimentary parameters as proxies of surface water properties in the Canary Islands region. Deep-Sea Res II 49(17):3631–3654
Moreno A, Targarona J, Henderiks J, Canals M, Freudenthal T, Meggers H (2001) Orbital forcing of dust supply to the North Canary Basin over the last 250 kyr. Quat Sci Rev 20:1327–1339
Moreno A, Nave S, Kuhlmann H, Canals M, Targarona J, Freudenthal T, Abrantes F (2002) Productivity response in the North Canary Basin to climate changes during the last 250000 yr: a multi-proxy approach. Earth Planet Sci Lett 196:147–159
Müller PJ, Suess E (1979) Productivity sedimentation rate and sedimentary organic matter in the oceans—I. Organic carbon preservation. Deep-Sea Res 26A:1347–1362
Neuer S, Ratmeyer V, Davenport R, Fischer G, Wefer G (1997) Deep water particle flux in the Canary Island region: seasonal trends in relation to long-term satellite derived pigment data and later sources. Deep-Sea Res I 44(8):1451–1466
Neuer S, Freudenthal T, Davenport R, Llinás O, Rueda MJ (2002) Seasonality of surface water properties and particle flux along a productivity gradient off NW Africa. Deep-Sea Res II 49(17):3561–3576
Nykjær L, Van Camp L (1994) Seasonal and interannual variability of coastal upwelling along northwest Africa and Portugal from 1981 to 1991. J Geophys Res 99(C7):14197–14207
Pailler D, Bard E (2002) High frequency paleoceanographic changes during the past 140000 yr recorded by the organic matter in sediments of the Iberian Margin. Palaeogeogr Palaeoclimatol Palaeoecol 181:431–452
Parker FL, Berger WH (1971) Faunal and solution patterns of planktonic foraminifera in surface sediments of the South Pacific. Deep-Sea Res 18:73–107
Parrilla G, Neuer S, Le Traon PY, Fernández-Suárez E (2002a) Canary Island Azores Gibraltar Observations (CANIGO) Volume I: studies in the northern Canary Islands Basin. Deep-Sea Res II 49(17):3409–3705
Parrilla G, Neuer S, Le Traon PY, Fernández-Suárez E (2002b) Canary Island Azores Gibraltar Observations (CANIGO) Volume II: studies of the Azores and Gibraltar regions. Deep-Sea Res II 49(19):3951–4270
Pedersen TF, Calvert S (1990) Anoxia vs productivity: what controls the formation of organic-carbon-rich sediments and sedimentary rocks? Am Assoc Petrol Geol Bull 74(4):454–466
Pelegrí JL, Antoranz A, Marrero-Díaz A, Ratsimandresy A, Cisneros-Aguirre J, Gordo C, Grisolía D, Hernández-Guerra A, Láiz I, Martínez A, Parrilla G, Pérez-Rodríguez P, Rodríguez-Santana A, Sangrá P (2005a) Hydrographic cruises off northwest Africa: the Canary current and the Cape Ghir region. J Mar Syst 54:39–63
Pelegrí JL, Arístegui J, Cana L, González-Dávila M, Hernández-Guerra A, Hernández-León S, Marrero-Díaz A, Montero MF, Sangrá P, Santana-Casiano M (2005b) Coupling between the open ocean and the coastal upwelling region off northwest Africa: water recirculation and offshore pumping of organic matter. J Mar Syst 54:3–37
Peterson LC, Overpeck JT, Kipp NG, Imbrie J (1991) A high-resolution Late Quaternary upwelling record from the anoxic Cariaco Basin, Venezuela. Paleoceanography 6(1):99–119
Pflaumann U, Duprat J, Pujol C, Labeyrie L (1996) SIMMAX: a modern analog technique to deduce Atlantic sea surface temperatures from planktonic foraminifera in deep-sea sediments. Paleoceanography 11(1):15–35
Pflaumann U, Sarnthein M, Ficken K, Grothmann A, Winkler A (1998) Variations in aeolian and carbonate sedimentation sea-surface temperature and productivity over the last 3 my at site 958 off Northwest Africa. In: Firth JV (ed) Proc ODP Sci Results 159T. Ocean Drilling Program, College Station, TX, pp 3–16
Prell WL, Curry WB (1981) Faunal and isotopic indices of monsoonal upwelling: Western Arabian Sea. Oceanol Acta 4(1):91–98
Pujol C, Vergnaud Grazzini C (1995) Distribution patterns of live planktic foraminifers as related to regional hydrography and productivity systems of the Mediterranean Sea. Mar Micropaleontol 25:187–217
Röhl U, Abrams LJ (2000) High resolution downhole and nondestructive core measurements from sites 999 and 1001 in the Caribbean Sea: application to the late Palaeocene thermal maximum. In: Leckie RM, Sigurdsson H, Acton GD, Draper G (eds) Proc ODP Sci Results 165. Ocean Drilling Program, College Station, TX, pp 191–203
Ruddiman WF, Sarnthein M, Baldauf J, Backman J, Bloemendal J, Curry W et al (1989) Eastern tropical Atlantic. Proc ODP Sci Results 108. Ocean Drilling Program, College Station, TX
Rühlemann C, Müller PJ, Schneider RR (1999) Organic carbon and carbonate as paleoproductivity proxies: examples from high and low productivity areas of the tropical Atlantic. In: Fischer G, Wefer G (eds) Use of proxies in paleoceanography: examples from the South Atlantic. Springer, Berlin Heidelberg New York, pp 315–344
Saito T, Thompson PR, Breger D (1981) Systematic index of Recent and Pleistocene planktonic Foraminifera. University of Tokyo Press, Tokyo
Sarnthein M, Winn K, Duplessy J-C, Fontugne MR (1988) Global variation of surface ocean productivity in low and mid latitudes: influence of CO2 reservoirs of the deep ocean and atmosphere during the last 21000 years. Paleoceanography 3(3):361–399
Sarnthein M, Winn K, Jung S, Duplessy J, Labeyrie L, Erlenkeuser H, Ganssen G (1994) Changes in east Atlantic deepwater circulation over the last 30000 years: eight time slice reconstructions. Paleoceanography 9(2):209–267
Shackleton NJ, Hall MA, Vincent E (2000) Phase relationships between millennial scale events 64000 to 24000 years ago. Paleoceanography 15(6):565–569
Sicre M-A, Ternois Y, Paterne M, Martinez P, Bertrand P (2001) Climatic changes in the upwelling region off Cap Blanc NW Africa over the last 70 kyear: a multi-biomarker approach. Org Geochem 32:981–990
Stein R (1990) Organic carbon content/sedimentation rate relationship and its paleoenvironmental significance for marine sediments. Geo-Mar Lett 10:37–44. doi:10.1007/BF02431020
Stein R (1991) Accumulation of organic carbon in marine sediments. Lecture Notes on Earth Science vol 34. Springer, Berlin Heidelberg New York
Stein R, ten Haven HL, Littke R, Rullkötter J, Welte DH (1989) Accumulation of marine and terrigenous organic carbon at upwelling site 658 and nonupwelling sites 657 and 659: implication for the reconstruction of paleoenvironments in the eastern subtropical Atlantic through late Cenozoic times. In: Ruddiman WF, Sarnthein M (eds) Proc ODP Sci Results 108. Ocean Drilling Program, College Station, TX, pp 361–385
Summerhayes CP, Milliman JD, Briggs SR, Bee AG, Hogan C (1976) Northwest African shelf sediments: influence of climate and sedimentary processes. J Geol 84:277–300
Thiede J, Suess E (1983) Coastal upwelling. Its sediment record. Sedimentary records of ancient coastal upwelling. NATO Conference Series IV 10B. Plenum, New York
Thomsen L (2002) The benthic boundary layer. In: Wefer G, Billett D, Hebbeln D, Jörgensen BB, Schlüter M, van Weering T (eds) Ocean margin systems. Springer, Berlin Heidelberg New York, pp 143–155
Thunell RC (1976) Optimum indices of calcium carbonate dissolution in deep-sea sediments. Geology 4:525–528
Thunell RC, Honjo S (1981) Calcite dissolution and the modification of planktonic foraminiferal assemblages. Mar Micropaleontol 6:169–182
Tyson RV (1995) Sedimentary organic matter. Chapman & Hall, London
Tyson RV (2001) Sedimentation rate dilution preservation and total organic carbon: some results of a modelling study. Org Geochem 32:333–339
Van Camp L, Nykjær L, Mittelstaedt E, Schlittenhardt P (1991) Upwelling and boundary circulation off Northwest Africa as depicted by infrared and visible satellite observations. Prog Oceanogr 26:357–402
Verardo DJ, McIntyre A (1994) Production and destruction: control of biogenous sedimentation in the tropical Atlantic 0–300000 years BP. Paleoceanography 9:63–86
Waelbroeck C, Labeyrie L, Michel E, Duplessy J, McManus JF, Lambeck K, Balbon E, Labracherie M (2002) Sea-level and deep water temperature changes derived from benthic foraminifera isotopic records. Quat Sci Rev 21:295–305
Walsh JJ (1991) Importance of continental margins in the marine biogeochemical cycling of carbon and nitrogen. Nature 350:53–55
Weaver PPE, Kuijpers A (1983) Climatic control of turbidite deposition on the Madeira Abyssal Plain. Nature 306:360–363
Weaver PPE, Rothwell RG (1987) Sedimentation on the Madeira Abyssal Plain over the last 300 000 years. In: Weaver PPE, Thomson J (eds) Geology and geochemistry of abyssal plains. Geol Soc Lond Spec Publ 31:71–86
Wollast R (2002) Continental margins: review of geochemical settings. In: Wefer G, Billett D, Hebbeln D, Jörgensen BB, Schlüter M, van Weering T (eds) Ocean margin systems. Springer, Berlin Heidelberg New York, pp 15–31
Wynn RB, Masson DG, Stow DAV, Weaver PPE (2000) The Northwest African slope apron: a modern analogue for deep-water systems with complex seafloor topography. Mar Petrol Geol 17:253–265
Wynn RB, Weaver PPE, Masson DG, Stow DAV (2002) Turbidite depositional architecture across three interconnected deep-water basins on the north-west African margin. Sedimentology 49:669–695
Yoder JA, Ishimaru T (1989) Phytoplankton advection off the southeastern United States continental shelf. Cont Shelf Res 9(6):547–553
Zhao M, Eglinton G, Haslett SK, Jordan RW, Sarnthein M, Zhang Z (2000) Marine and terrestrial biomarker records for the last 35000 years at ODP site 658C off NW Africa. Org Geochem 31:919–930
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Bozzano, G., Alonso, B. Transfer of organic carbon on the Moroccan Atlantic continental margin (NW Africa): productivity and lateral advection. Geo-Mar Lett 29, 277–289 (2009). https://doi.org/10.1007/s00367-009-0141-y
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DOI: https://doi.org/10.1007/s00367-009-0141-y