20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments
Multi-proxy analysis of two marine sediment cores (MS27PT and MD04-2726) from the Nile continental slope provides evidence of changes in Nile sediment discharge related to changes in Ethiopian African Monsoon (EAM) precipitation, and allows us to reconstruct changes in Nile River runoff, vegetation...
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/200260 2024-06-23T07:55:21+00:00 20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments REVEL, Marie DUCASSOU, Emmanuelle SKONIECZNY, C. COLIN, C. BASTIAN, L. BOSCH, Delphine MIGEON, S. MASCLE, J. 2015-12-15 https://oskar-bordeaux.fr/handle/20.500.12278/200260 https://hdl.handle.net/20.500.12278/200260 https://doi.org/10.1016/j.quascirev.2015.10.030 EN eng 0277-3791 https://oskar-bordeaux.fr/handle/20.500.12278/200260 doi:10.1016/j.quascirev.2015.10.030 open Pas de Licence CC Western Nile upper continental slope sediments East African monsoon Nile river Palaeohydrology Neodymium and oxygen isotopes Major elements Holocene Last deglaciation Planète et Univers [physics]/Sciences de la Terre/Géochimie Article de revue 2015 ftoskarbordeaux https://doi.org/20.500.12278/20026010.1016/j.quascirev.2015.10.030 2024-06-10T14:02:26Z Multi-proxy analysis of two marine sediment cores (MS27PT and MD04-2726) from the Nile continental slope provides evidence of changes in Nile sediment discharge related to changes in Ethiopian African Monsoon (EAM) precipitation, and allows us to reconstruct changes in Nile River runoff, vegetation and erosion in the Nile headwaters. Sediment element composition and neodymium isotopic composition reveal significant changes in clastic sediment provenance, with sources oscillating between a Saharan aeolian contribution during the Last Glacial Maximum/deglacial transition and during the Late Holocene, and a Blue/Atbara Nile fluvial contribution during the African Humid Period (AHP). This study provides a new understanding of past environmental changes. Between 14.6 and 14.13 ka there was a major input of sediments from the Ethiopian Highlands, consistent with a stronger EAM at that time. Climate in the Nile basin was wetter between 14.8 and 8.4 ka, with a corresponding increase in Blue Nile water and sediment discharge via the main Nile into the Eastern Mediterranean. The gradual climatic transition from the AHP to the present-day dry climate was reflected in a decrease in Blue Nile sediment deposition and flood discharge between 8.4 and 3.7 ka, with aridity at a maximum between 3.7 and 2.6 ka. The onset of drier conditions in the Blue Nile basin seems to have begun before the 8.2 ka cooling event in the North Atlantic. We speculate that the climatic change from the wet AHP to the dry late Holocene may have been a result of a break in the low latitude dynamic equilibrium between climate, vegetation and erosion, which may in turn have affected the climate in higher latitudes. Reduced Nile flow may also have had an impact on Levantine Intermediate Water originating in the Eastern Mediterranean through an increase in intermediate water formation. Article in Journal/Newspaper North Atlantic OSKAR Bordeaux (Open Science Knowledge ARchive) Quaternary Science Reviews 130 200 221 |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
Western Nile upper continental slope sediments East African monsoon Nile river Palaeohydrology Neodymium and oxygen isotopes Major elements Holocene Last deglaciation Planète et Univers [physics]/Sciences de la Terre/Géochimie |
spellingShingle |
Western Nile upper continental slope sediments East African monsoon Nile river Palaeohydrology Neodymium and oxygen isotopes Major elements Holocene Last deglaciation Planète et Univers [physics]/Sciences de la Terre/Géochimie REVEL, Marie DUCASSOU, Emmanuelle SKONIECZNY, C. COLIN, C. BASTIAN, L. BOSCH, Delphine MIGEON, S. MASCLE, J. 20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments |
topic_facet |
Western Nile upper continental slope sediments East African monsoon Nile river Palaeohydrology Neodymium and oxygen isotopes Major elements Holocene Last deglaciation Planète et Univers [physics]/Sciences de la Terre/Géochimie |
description |
Multi-proxy analysis of two marine sediment cores (MS27PT and MD04-2726) from the Nile continental slope provides evidence of changes in Nile sediment discharge related to changes in Ethiopian African Monsoon (EAM) precipitation, and allows us to reconstruct changes in Nile River runoff, vegetation and erosion in the Nile headwaters. Sediment element composition and neodymium isotopic composition reveal significant changes in clastic sediment provenance, with sources oscillating between a Saharan aeolian contribution during the Last Glacial Maximum/deglacial transition and during the Late Holocene, and a Blue/Atbara Nile fluvial contribution during the African Humid Period (AHP). This study provides a new understanding of past environmental changes. Between 14.6 and 14.13 ka there was a major input of sediments from the Ethiopian Highlands, consistent with a stronger EAM at that time. Climate in the Nile basin was wetter between 14.8 and 8.4 ka, with a corresponding increase in Blue Nile water and sediment discharge via the main Nile into the Eastern Mediterranean. The gradual climatic transition from the AHP to the present-day dry climate was reflected in a decrease in Blue Nile sediment deposition and flood discharge between 8.4 and 3.7 ka, with aridity at a maximum between 3.7 and 2.6 ka. The onset of drier conditions in the Blue Nile basin seems to have begun before the 8.2 ka cooling event in the North Atlantic. We speculate that the climatic change from the wet AHP to the dry late Holocene may have been a result of a break in the low latitude dynamic equilibrium between climate, vegetation and erosion, which may in turn have affected the climate in higher latitudes. Reduced Nile flow may also have had an impact on Levantine Intermediate Water originating in the Eastern Mediterranean through an increase in intermediate water formation. |
format |
Article in Journal/Newspaper |
author |
REVEL, Marie DUCASSOU, Emmanuelle SKONIECZNY, C. COLIN, C. BASTIAN, L. BOSCH, Delphine MIGEON, S. MASCLE, J. |
author_facet |
REVEL, Marie DUCASSOU, Emmanuelle SKONIECZNY, C. COLIN, C. BASTIAN, L. BOSCH, Delphine MIGEON, S. MASCLE, J. |
author_sort |
REVEL, Marie |
title |
20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments |
title_short |
20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments |
title_full |
20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments |
title_fullStr |
20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments |
title_full_unstemmed |
20,000 years of Nile River dynamics and environmental changes in the Nile catchment area as inferred from Nile upper continental slope sediments |
title_sort |
20,000 years of nile river dynamics and environmental changes in the nile catchment area as inferred from nile upper continental slope sediments |
publishDate |
2015 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/200260 https://hdl.handle.net/20.500.12278/200260 https://doi.org/10.1016/j.quascirev.2015.10.030 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
0277-3791 https://oskar-bordeaux.fr/handle/20.500.12278/200260 doi:10.1016/j.quascirev.2015.10.030 |
op_rights |
open Pas de Licence CC |
op_doi |
https://doi.org/20.500.12278/20026010.1016/j.quascirev.2015.10.030 |
container_title |
Quaternary Science Reviews |
container_volume |
130 |
container_start_page |
200 |
op_container_end_page |
221 |
_version_ |
1802647923346898944 |