Stable hydrogen isotopic composition (dD) and stable carbon isotopic composition (δ¹³C) of sediment core GeoB9508-5 off Senegal
To reconstruct variability of the West African monsoon and associated vegetation changes on precessional and millennial time scales, we analyzed a marine sediment core from the continental slope off Senegal spanning the past 44,000 years (44 ka). We used the stable hydrogen isotopic composition (dD)...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.756999 2023-05-15T17:35:58+02:00 Stable hydrogen isotopic composition (dD) and stable carbon isotopic composition (δ¹³C) of sediment core GeoB9508-5 off Senegal Niedermeyer, Eva M Schefuß, Enno Sessions, Alex L Mulitza, Stefan Mollenhauer, Gesine Schulz, Michael Wefer, Gerold LATITUDE: 15.498333 * LONGITUDE: -17.948000 * DATE/TIME START: 2005-06-15T13:51:00 * DATE/TIME END: 2005-06-15T13:51:00 2010-02-07 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.756999 https://doi.org/10.1594/PANGAEA.756999 en eng PANGAEA Niedermeyer, Eva M (2009): Northwest African Sahel climate variations during Holocene/Late Pleistocene: Insights from plant wax stable hydrogen (dD) and carbon (d13C) isotopic composition and sea-surface temperature. PhD Thesis, Elektronische Dissertationen an der Staats- und Universitätsbibliothek Bremen, Germany, urn:nbn:de:gbv:46-diss000116574 https://doi.pangaea.de/10.1594/PANGAEA.756999 https://doi.org/10.1594/PANGAEA.756999 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Niedermeyer, Eva M; Schefuß, Enno; Sessions, Alex L; Mulitza, Stefan; Mollenhauer, Gesine; Schulz, Michael; Wefer, Gerold (2010): Orbital- and millennial-scale changes in the hydrologic cycle and vegetation in the western African Sahel: Insights from individual plant wax delta D and d13C. Quaternary Science Reviews, 29(23-24), 2996-3005, https://doi.org/10.1016/j.quascirev.2010.06.039 293 Center for Marine Environmental Sciences GeoB9508-5 Gravity corer (Kiel type) M65/1 MARUM Meteor (1986) SL Dataset 2010 ftpangaea https://doi.org/10.1594/PANGAEA.756999 https://doi.org/10.1016/j.quascirev.2010.06.039 2023-01-20T07:32:03Z To reconstruct variability of the West African monsoon and associated vegetation changes on precessional and millennial time scales, we analyzed a marine sediment core from the continental slope off Senegal spanning the past 44,000 years (44 ka). We used the stable hydrogen isotopic composition (dD) of individual terrestrial plant wax n-alkanes as a proxy for past rainfall variability. The abundance and stable carbon isotopic composition (d13C) of the same compounds were analyzed to assess changes in vegetation composition (C3/C4 plants) and density. The dD record reveals two wet periods that coincide with local maximum summer insolation from 38 to 28 ka and 15 to 4 ka and that are separated by a less wet period during minimum summer insolation. Our data indicate that rainfall intensity during the rainy season throughout both wet humid periods was similar, whereas the length of the rainy season was presumably shorter during the last glacial than during the Holocene. Additional dry intervals are identified that coincide with North Atlantic Heinrich stadials and the Younger Dryas interval, indicating that the West African monsoon over tropical northwest Africa is linked to both insolation forcing and high-latitude climate variability. The d13C record indicates that vegetation of the western Sahel was consistently dominated by C4 plants during the past 44 ka, whereas C3-type vegetation increased during the Holocene. Moreover, we observe a gradual ending of the Holocene humid period together with unchanging ratio of C3 to C4 plants, indicating that an abrupt aridification due to vegetation feedbacks is not a general characteristic of this time interval. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-17.948000,-17.948000,15.498333,15.498333) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
293 Center for Marine Environmental Sciences GeoB9508-5 Gravity corer (Kiel type) M65/1 MARUM Meteor (1986) SL |
spellingShingle |
293 Center for Marine Environmental Sciences GeoB9508-5 Gravity corer (Kiel type) M65/1 MARUM Meteor (1986) SL Niedermeyer, Eva M Schefuß, Enno Sessions, Alex L Mulitza, Stefan Mollenhauer, Gesine Schulz, Michael Wefer, Gerold Stable hydrogen isotopic composition (dD) and stable carbon isotopic composition (δ¹³C) of sediment core GeoB9508-5 off Senegal |
topic_facet |
293 Center for Marine Environmental Sciences GeoB9508-5 Gravity corer (Kiel type) M65/1 MARUM Meteor (1986) SL |
description |
To reconstruct variability of the West African monsoon and associated vegetation changes on precessional and millennial time scales, we analyzed a marine sediment core from the continental slope off Senegal spanning the past 44,000 years (44 ka). We used the stable hydrogen isotopic composition (dD) of individual terrestrial plant wax n-alkanes as a proxy for past rainfall variability. The abundance and stable carbon isotopic composition (d13C) of the same compounds were analyzed to assess changes in vegetation composition (C3/C4 plants) and density. The dD record reveals two wet periods that coincide with local maximum summer insolation from 38 to 28 ka and 15 to 4 ka and that are separated by a less wet period during minimum summer insolation. Our data indicate that rainfall intensity during the rainy season throughout both wet humid periods was similar, whereas the length of the rainy season was presumably shorter during the last glacial than during the Holocene. Additional dry intervals are identified that coincide with North Atlantic Heinrich stadials and the Younger Dryas interval, indicating that the West African monsoon over tropical northwest Africa is linked to both insolation forcing and high-latitude climate variability. The d13C record indicates that vegetation of the western Sahel was consistently dominated by C4 plants during the past 44 ka, whereas C3-type vegetation increased during the Holocene. Moreover, we observe a gradual ending of the Holocene humid period together with unchanging ratio of C3 to C4 plants, indicating that an abrupt aridification due to vegetation feedbacks is not a general characteristic of this time interval. |
format |
Dataset |
author |
Niedermeyer, Eva M Schefuß, Enno Sessions, Alex L Mulitza, Stefan Mollenhauer, Gesine Schulz, Michael Wefer, Gerold |
author_facet |
Niedermeyer, Eva M Schefuß, Enno Sessions, Alex L Mulitza, Stefan Mollenhauer, Gesine Schulz, Michael Wefer, Gerold |
author_sort |
Niedermeyer, Eva M |
title |
Stable hydrogen isotopic composition (dD) and stable carbon isotopic composition (δ¹³C) of sediment core GeoB9508-5 off Senegal |
title_short |
Stable hydrogen isotopic composition (dD) and stable carbon isotopic composition (δ¹³C) of sediment core GeoB9508-5 off Senegal |
title_full |
Stable hydrogen isotopic composition (dD) and stable carbon isotopic composition (δ¹³C) of sediment core GeoB9508-5 off Senegal |
title_fullStr |
Stable hydrogen isotopic composition (dD) and stable carbon isotopic composition (δ¹³C) of sediment core GeoB9508-5 off Senegal |
title_full_unstemmed |
Stable hydrogen isotopic composition (dD) and stable carbon isotopic composition (δ¹³C) of sediment core GeoB9508-5 off Senegal |
title_sort |
stable hydrogen isotopic composition (dd) and stable carbon isotopic composition (δ¹³c) of sediment core geob9508-5 off senegal |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.756999 https://doi.org/10.1594/PANGAEA.756999 |
op_coverage |
LATITUDE: 15.498333 * LONGITUDE: -17.948000 * DATE/TIME START: 2005-06-15T13:51:00 * DATE/TIME END: 2005-06-15T13:51:00 |
long_lat |
ENVELOPE(-17.948000,-17.948000,15.498333,15.498333) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Niedermeyer, Eva M; Schefuß, Enno; Sessions, Alex L; Mulitza, Stefan; Mollenhauer, Gesine; Schulz, Michael; Wefer, Gerold (2010): Orbital- and millennial-scale changes in the hydrologic cycle and vegetation in the western African Sahel: Insights from individual plant wax delta D and d13C. Quaternary Science Reviews, 29(23-24), 2996-3005, https://doi.org/10.1016/j.quascirev.2010.06.039 |
op_relation |
Niedermeyer, Eva M (2009): Northwest African Sahel climate variations during Holocene/Late Pleistocene: Insights from plant wax stable hydrogen (dD) and carbon (d13C) isotopic composition and sea-surface temperature. PhD Thesis, Elektronische Dissertationen an der Staats- und Universitätsbibliothek Bremen, Germany, urn:nbn:de:gbv:46-diss000116574 https://doi.pangaea.de/10.1594/PANGAEA.756999 https://doi.org/10.1594/PANGAEA.756999 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.756999 https://doi.org/10.1016/j.quascirev.2010.06.039 |
_version_ |
1766135278771109888 |