Tidal flat sedimentation during the last millennium in the northern area of Tidra Island, Banc d’Arguin, Mauritania

Proske, Ulrike; Hanebuth, Till J J; Meggers, Helge; Leroy, Suzanne A.G.

doi:10.1016/j.jafrearsci.2007.09.002

Cited by 11 publications

(5 citation statements)

References 27 publications

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“…It must be borne in mind that a major result of the work confirmed the stability of the sea level during the whole period of the littoral zone construction, as previously stated to the north in the Jerf el Oustani area (Barusseau et al, 2007) and more recently taken up by Proske et al (2008). Morphological and sedimentological study of the Iwik-Aouatil coastal plain architecture reveals two distinct types of sandy units.…”

Section: Discussionsupporting

confidence: 71%

Late Holocene morphodynamics in the littoral zone of the Iwik Peninsula area (Banc d'Arguin — Mauritania)

et al. 2010

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Section: Discussionsupporting

confidence: 71%

Late Holocene morphodynamics in the littoral zone of the Iwik Peninsula area (Banc d'Arguin — Mauritania)

et al. 2010

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“…Samples were analyzed in three cores, 50 cm-long each, at three sites representing different hydrodynamic regime sites: Exposed (top panel), Intermediate (middle panel) and Sheltered (bottom panel). Age estimates (right y-axis) are based on sediment accumulation rates obtained from 14C ages of shells retrieved from nearby cores (Proske et al, 2008). El-Hacen et al 10.3389/fmars.2022.1006847 (Figure 4).…”

Section: Resultsmentioning

confidence: 99%

“…Age determination of core sediments 210 Pb dating of the core was performed but the unsupported levels of 210 Pb were too low, and the data could not be used to determine the age of the sediments. Instead, we estimated the age of our samples using the data of two cores taken in close proximity of our sampling stations and which were dated using 14 C (Proske et al, 2008). These 14 C ages are based on deep shell layers from the sedimentary succession.…”

Section: Sample Collectionmentioning

confidence: 99%

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Fossilized diatoms as indirect indicators of the origin of carbon stored in intertidal flats

El-Hacen

Mens²,

Bouma³

et al. 2022

Front. Mar. Sci.

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Coastal systems store enormous carbon quantities in their sediment, which originates from various autochthonous and allochthonous sources. Carbon fluxes in coastal ecosystems have a strong effect on the recipient food-webs and carbon emission offsets. Yet, the relative importance of autochthonous vs. allochthonous C inputs to coastal carbon budget is still challenging to identify. Here, we combine diatoms preserved in the sediment with geochemical analyses to identify the sources of carbon stored in Africa’s largest intertidal seagrass beds at Banc d’Arguin, Mauritania. The area lies between an active ocean upwelling and the ‘Sahara-dust hotspot’ systems. The extensive seagrass beds of the area are thus expected to receive C from these neighboring systems in addition to producing C in-situ. Three sediment cores (50 cm) were collected at three intertidal sites with different hydrodynamic regimes, and analyzed for diatom composition, total organic carbon (TOC), total nitrogen (TN), total phosphorus (TP), and carbon isotopic signatures (δ13C). Diatom taxa are grouped into three guilds: (1) benthic (epiphyte, epipelon, and epipsammon), (2) planktonic, and (3) freshwater. Benthic diatoms are considered to be autochthonous, while typical oceanic and freshwater diatoms are considered to be allochthonous. Benthic diatoms are the most diverse and abundant group, while allochthonous freshwater (i.e., dust imported) and typical upwelling (i.e., tidal imported) taxa ranked last in both abundance and species’ richness. Structure equation modelling shows that variation in the stored carbon is best explained by the total abundance of diatoms and guild composition. We conclude that the C stored in the intertidal seagrass beds of Banc d’Arguin is predominantly autochthonous. Our method provides an effective way to identify historical carbon sources in coastal systems.

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“…The northern Tidra Island is famous for the local occurrence of west Africa's northernmost mangroves (Proske et al, 2008), which grow in humid and warm climates. Humid and warm conditions are also beneficial for the formation of gibbsite which forms through tropical weathering (Deer et al, 1992).…”

Section: Dust Collected On Landmentioning

confidence: 99%

Seasonal provenance changes of present-day Saharan dust collected on- and offshore Mauritania

Friese¹,

Hateren²,

Vogt³

et al. 2017

Preprint

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Abstract. Saharan dust has a crucial influence on the earth climate system and its emission, transport and deposition are intimately related to, e.g., wind speed, precipitation, temperature and vegetation cover. The alteration in the physical and chemical properties of Saharan dust due to environmental changes is often used to reconstruct the climate of the past. However, to better interpret possible climate changes the dust source regions need to be known. By analysing the mineralogical composition of transported or deposited dust, potential dust source areas can be inferred. Summer dust transport off northwest Africa occurs in the Saharan air layer (SAL). In continental dust source areas, dust is also transported in the SAL; however, the predominant dust input occurs from nearby dust sources with the low-level trade winds. Hence, the source regions and related mineralogical tracers differ with season and sampling location. To test this, dust collected in traps onshore and in oceanic sediment traps off Mauritania during 2013 to 2015 was analysed. Meteorological data, particle-size distributions, back-trajectory and mineralogical analyses were compared to derive the dust provenance and dispersal. For the onshore dust samples, the source regions varied according to the seasonal changes in trade-wind direction. Gibbsite and dolomite indicated a Western Saharan and local source during summer, while chlorite, serpentine and rutile indicated a source in Mauritania and Mali during winter. In contrast, for the samples that were collected offshore, dust sources varied according to the seasonal change in the dust transporting air layer. In summer, dust was transported in the SAL from Mauritania, Mali and Libya as indicated by ferroglaucophane and zeolite. In winter, dust was transported with the trades from Western Sahara as indicated by, e.g., fluellite.

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Tidal flat sedimentation during the last millennium in the northern area of Tidra Island, Banc d’Arguin, Mauritania

Cited by 11 publications

References 27 publications

Late Holocene morphodynamics in the littoral zone of the Iwik Peninsula area (Banc d'Arguin — Mauritania)

Late Holocene morphodynamics in the littoral zone of the Iwik Peninsula area (Banc d'Arguin — Mauritania)

Fossilized diatoms as indirect indicators of the origin of carbon stored in intertidal flats

Seasonal provenance changes of present-day Saharan dust collected on- and offshore Mauritania

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