Frequency of exceptional Nile flood events as an indicator of Holocene hydro-climatic changes in the Ethiopian Highlands
International audience Climate conditions in Africa have varied substantially during the Late Quaternary with alternating humid and arid periods controlled mainly by the African monsoonal regime. However, the duration and termination of the last African Humid Period (14–6 ka BP) and its internal cli...
Published in: | Quaternary Science Reviews |
---|---|
Main Authors: | , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2020
|
Subjects: | |
Online Access: | https://hal.science/hal-02929747 https://doi.org/10.1016/j.quascirev.2020.106543 |
id |
ftunivantilles:oai:HAL:hal-02929747v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Université des Antilles (UAG): HAL |
op_collection_id |
ftunivantilles |
language |
English |
topic |
[SHS]Humanities and Social Sciences [SDV]Life Sciences [q-bio] [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SHS]Humanities and Social Sciences [SDV]Life Sciences [q-bio] [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Mologni, Carlo Revel, Marie Blanchet, Cécile Bosch, Delphine Develle, Anne-Lise Bastian, Luc Khalidi, Lamya Ducassou, Emmanuelle Migeon, Sébastien Orange, François Frequency of exceptional Nile flood events as an indicator of Holocene hydro-climatic changes in the Ethiopian Highlands |
topic_facet |
[SHS]Humanities and Social Sciences [SDV]Life Sciences [q-bio] [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Climate conditions in Africa have varied substantially during the Late Quaternary with alternating humid and arid periods controlled mainly by the African monsoonal regime. However, the duration and termination of the last African Humid Period (14–6 ka BP) and its internal climatic variability are still debated. Using a laminated sequence from the Nile Deep-Sea Fan, we reconstruct for the first time the monsoon-induced frequency of exceptional Nile floods at centennial resolution during the African Humid Period. By combining sedimentological, geochemical and microscopic tools and comparing our record with two proximal piston cores and with regional paleoclimatic records, we show: a) the occurrence of recurrent high-energy floods between 10.1 and 9 ka BP, during the height of the African Humid Period; b) a shift in the hydro-climatic regime as early as 9 ka BP, with a progressive reduction in flood frequency and magnitude until 8.2 ka BP, likely related to a southward migration of the monsoon rainfall belt; c) a drastic reduction of flood activity between 8.2 and 7.8 ka BP; d) an unstable Ethiopian-Nile hydrological system from 7.8 ka BP, followed by a further decrease in river runoff until ∼4 ka BP. The occurrence of a stepwise hydro-climatic deterioration over the Ethiopian Highlands from ∼9 ka BP brings into question the climatic linkages and feedbacks between low and high latitudes during the Early to Mid-Holocene and in particular around the 8.2 ka BP North Atlantic cooling event. Our unique record of flood frequency at centennial-resolution therefore allows us to draw new insights on fluvial and geomorphic feedbacks of the Nile hydrologic system to monsoonal regimes during a period of major environmental shifts. |
author2 |
Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) AGROCAMPUS OUEST Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Culture et Environnements, Préhistoire, Antiquité, Moyen-Age (CEPAM) Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UniCA) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Mologni, Carlo Revel, Marie Blanchet, Cécile Bosch, Delphine Develle, Anne-Lise Bastian, Luc Khalidi, Lamya Ducassou, Emmanuelle Migeon, Sébastien Orange, François |
author_facet |
Mologni, Carlo Revel, Marie Blanchet, Cécile Bosch, Delphine Develle, Anne-Lise Bastian, Luc Khalidi, Lamya Ducassou, Emmanuelle Migeon, Sébastien Orange, François |
author_sort |
Mologni, Carlo |
title |
Frequency of exceptional Nile flood events as an indicator of Holocene hydro-climatic changes in the Ethiopian Highlands |
title_short |
Frequency of exceptional Nile flood events as an indicator of Holocene hydro-climatic changes in the Ethiopian Highlands |
title_full |
Frequency of exceptional Nile flood events as an indicator of Holocene hydro-climatic changes in the Ethiopian Highlands |
title_fullStr |
Frequency of exceptional Nile flood events as an indicator of Holocene hydro-climatic changes in the Ethiopian Highlands |
title_full_unstemmed |
Frequency of exceptional Nile flood events as an indicator of Holocene hydro-climatic changes in the Ethiopian Highlands |
title_sort |
frequency of exceptional nile flood events as an indicator of holocene hydro-climatic changes in the ethiopian highlands |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02929747 https://doi.org/10.1016/j.quascirev.2020.106543 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://hal.science/hal-02929747 Quaternary Science Reviews, 2020, 247, pp.106543. ⟨10.1016/j.quascirev.2020.106543⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2020.106543 hal-02929747 https://hal.science/hal-02929747 doi:10.1016/j.quascirev.2020.106543 |
op_doi |
https://doi.org/10.1016/j.quascirev.2020.106543 |
container_title |
Quaternary Science Reviews |
container_volume |
247 |
container_start_page |
106543 |
_version_ |
1810464758203154432 |
spelling |
ftunivantilles:oai:HAL:hal-02929747v1 2024-09-15T18:24:25+00:00 Frequency of exceptional Nile flood events as an indicator of Holocene hydro-climatic changes in the Ethiopian Highlands Mologni, Carlo Revel, Marie Blanchet, Cécile Bosch, Delphine Develle, Anne-Lise Bastian, Luc Khalidi, Lamya Ducassou, Emmanuelle Migeon, Sébastien Orange, François Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) AGROCAMPUS OUEST Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Culture et Environnements, Préhistoire, Antiquité, Moyen-Age (CEPAM) Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UniCA) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 2020-11 https://hal.science/hal-02929747 https://doi.org/10.1016/j.quascirev.2020.106543 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2020.106543 hal-02929747 https://hal.science/hal-02929747 doi:10.1016/j.quascirev.2020.106543 ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://hal.science/hal-02929747 Quaternary Science Reviews, 2020, 247, pp.106543. ⟨10.1016/j.quascirev.2020.106543⟩ [SHS]Humanities and Social Sciences [SDV]Life Sciences [q-bio] [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2020 ftunivantilles https://doi.org/10.1016/j.quascirev.2020.106543 2024-07-15T23:39:29Z International audience Climate conditions in Africa have varied substantially during the Late Quaternary with alternating humid and arid periods controlled mainly by the African monsoonal regime. However, the duration and termination of the last African Humid Period (14–6 ka BP) and its internal climatic variability are still debated. Using a laminated sequence from the Nile Deep-Sea Fan, we reconstruct for the first time the monsoon-induced frequency of exceptional Nile floods at centennial resolution during the African Humid Period. By combining sedimentological, geochemical and microscopic tools and comparing our record with two proximal piston cores and with regional paleoclimatic records, we show: a) the occurrence of recurrent high-energy floods between 10.1 and 9 ka BP, during the height of the African Humid Period; b) a shift in the hydro-climatic regime as early as 9 ka BP, with a progressive reduction in flood frequency and magnitude until 8.2 ka BP, likely related to a southward migration of the monsoon rainfall belt; c) a drastic reduction of flood activity between 8.2 and 7.8 ka BP; d) an unstable Ethiopian-Nile hydrological system from 7.8 ka BP, followed by a further decrease in river runoff until ∼4 ka BP. The occurrence of a stepwise hydro-climatic deterioration over the Ethiopian Highlands from ∼9 ka BP brings into question the climatic linkages and feedbacks between low and high latitudes during the Early to Mid-Holocene and in particular around the 8.2 ka BP North Atlantic cooling event. Our unique record of flood frequency at centennial-resolution therefore allows us to draw new insights on fluvial and geomorphic feedbacks of the Nile hydrologic system to monsoonal regimes during a period of major environmental shifts. Article in Journal/Newspaper North Atlantic Université des Antilles (UAG): HAL Quaternary Science Reviews 247 106543 |