Organic matter isotopes reveal enhanced rainfall activity in Northwestern Mediterranean borderland during warm substages of the last 200 kyr
International audience In this study we use bulk sediment organic matter stable isotopes (δ13Corg and δ15N) to examine the nature and timing of preserved organic matter in borehole PRGL1-4 from Northwestern Mediterranean Sea. This region is known as a transitional zone between the North Atlantic atm...
Published in: | Quaternary Science Reviews |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2019
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Online Access: | https://hal.univ-brest.fr/hal-02185409 https://hal.univ-brest.fr/hal-02185409/document https://hal.univ-brest.fr/hal-02185409/file/61116.pdf https://doi.org/10.1016/j.quascirev.2018.12.007 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Rainfall North Atlantic oscillation Mediterranean Organic matter North Mediterranean borderland Sapropel [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Rainfall North Atlantic oscillation Mediterranean Organic matter North Mediterranean borderland Sapropel [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Pasquier, Virgil Toucanne, Samuel Sansjofre, Pierre Dixit, Yama Révillon, Sidonie Mokeddem, Zohra Rabineau, Marina Organic matter isotopes reveal enhanced rainfall activity in Northwestern Mediterranean borderland during warm substages of the last 200 kyr |
topic_facet |
Rainfall North Atlantic oscillation Mediterranean Organic matter North Mediterranean borderland Sapropel [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience In this study we use bulk sediment organic matter stable isotopes (δ13Corg and δ15N) to examine the nature and timing of preserved organic matter in borehole PRGL1-4 from Northwestern Mediterranean Sea. This region is known as a transitional zone between the North Atlantic atmospheric circulation and the North African monsoon system. In the Gulf of Lion (SE France), increased inputs of organic matter from sediment-laden rivers occurred during warm substages of the last 200 kyr (MIS 5e, 5c, and 5a; MIS 6d, and 6b). Increased terrestrial organic matter are inferred from organic carbon isotopic composition (δ13Corg), and are interpreted as resulting from enhanced rainfall over the Rhone river catchment area. Such increase in terrestrial organic carbon induced enhancement of the primary productivity leading to the formation of local oxygen minimum zone as demonstrated by ∼3‰ values in δ15N. Comparison with regional paleohydrological records from the northern Mediterranean borderlands reveals the regional character of these pluvial events. Taking advantage of the location of PRGL1-4 borehole, out of Mediterranean cyclogenesis area, we suggest that the pluvial events recorded during warm substages of the last 200 kyr occurred in response to enhanced passage of North Atlantic atmospheric perturbation over the Gulf of Lion catchment area (especially over Rhone river watershed which represent 80% of the GoL catchment area), a scenario possibly similar to that encountered today during negative- NAO like conditions. At a regional scale, our data suggests that high rainfall events over the Gulf of Lion catchement area and the Rhone watershed occurred at the time of North African summer monsoon and the sapropel deposition in the Mediterranean basin, thus highlighting a close coupling between mid- (North Atlantic) and low-latitudes (monsoon) climate systems. Importantly, our geochemical evidence from the Gulf of Lion support an extra-Mediterranean source for the regional pluvial events described in ... |
author2 |
Laboratoire Géosciences Océan (LGO) Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Nanyang Technological University Singapour ISBlue - Interdisciplinary Graduate School for the Blue planet (2017) ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) |
format |
Article in Journal/Newspaper |
author |
Pasquier, Virgil Toucanne, Samuel Sansjofre, Pierre Dixit, Yama Révillon, Sidonie Mokeddem, Zohra Rabineau, Marina |
author_facet |
Pasquier, Virgil Toucanne, Samuel Sansjofre, Pierre Dixit, Yama Révillon, Sidonie Mokeddem, Zohra Rabineau, Marina |
author_sort |
Pasquier, Virgil |
title |
Organic matter isotopes reveal enhanced rainfall activity in Northwestern Mediterranean borderland during warm substages of the last 200 kyr |
title_short |
Organic matter isotopes reveal enhanced rainfall activity in Northwestern Mediterranean borderland during warm substages of the last 200 kyr |
title_full |
Organic matter isotopes reveal enhanced rainfall activity in Northwestern Mediterranean borderland during warm substages of the last 200 kyr |
title_fullStr |
Organic matter isotopes reveal enhanced rainfall activity in Northwestern Mediterranean borderland during warm substages of the last 200 kyr |
title_full_unstemmed |
Organic matter isotopes reveal enhanced rainfall activity in Northwestern Mediterranean borderland during warm substages of the last 200 kyr |
title_sort |
organic matter isotopes reveal enhanced rainfall activity in northwestern mediterranean borderland during warm substages of the last 200 kyr |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.univ-brest.fr/hal-02185409 https://hal.univ-brest.fr/hal-02185409/document https://hal.univ-brest.fr/hal-02185409/file/61116.pdf https://doi.org/10.1016/j.quascirev.2018.12.007 |
long_lat |
ENVELOPE(158.733,158.733,-79.983,-79.983) |
geographic |
Rhone |
geographic_facet |
Rhone |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
ISSN: 0277-3791 Quaternary Science Reviews https://hal.univ-brest.fr/hal-02185409 Quaternary Science Reviews, Elsevier, 2019, 205, pp.182-192. ⟨10.1016/j.quascirev.2018.12.007⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2018.12.007 hal-02185409 https://hal.univ-brest.fr/hal-02185409 https://hal.univ-brest.fr/hal-02185409/document https://hal.univ-brest.fr/hal-02185409/file/61116.pdf doi:10.1016/j.quascirev.2018.12.007 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2018.12.007 |
container_title |
Quaternary Science Reviews |
container_volume |
205 |
container_start_page |
182 |
op_container_end_page |
192 |
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1766122905312165888 |
spelling |
ftccsdartic:oai:HAL:hal-02185409v1 2023-05-15T17:29:15+02:00 Organic matter isotopes reveal enhanced rainfall activity in Northwestern Mediterranean borderland during warm substages of the last 200 kyr Pasquier, Virgil Toucanne, Samuel Sansjofre, Pierre Dixit, Yama Révillon, Sidonie Mokeddem, Zohra Rabineau, Marina Laboratoire Géosciences Océan (LGO) Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Nanyang Technological University Singapour ISBlue - Interdisciplinary Graduate School for the Blue planet (2017) ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) 2019 https://hal.univ-brest.fr/hal-02185409 https://hal.univ-brest.fr/hal-02185409/document https://hal.univ-brest.fr/hal-02185409/file/61116.pdf https://doi.org/10.1016/j.quascirev.2018.12.007 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2018.12.007 hal-02185409 https://hal.univ-brest.fr/hal-02185409 https://hal.univ-brest.fr/hal-02185409/document https://hal.univ-brest.fr/hal-02185409/file/61116.pdf doi:10.1016/j.quascirev.2018.12.007 info:eu-repo/semantics/OpenAccess ISSN: 0277-3791 Quaternary Science Reviews https://hal.univ-brest.fr/hal-02185409 Quaternary Science Reviews, Elsevier, 2019, 205, pp.182-192. ⟨10.1016/j.quascirev.2018.12.007⟩ Rainfall North Atlantic oscillation Mediterranean Organic matter North Mediterranean borderland Sapropel [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2019 ftccsdartic https://doi.org/10.1016/j.quascirev.2018.12.007 2021-12-25T23:34:49Z International audience In this study we use bulk sediment organic matter stable isotopes (δ13Corg and δ15N) to examine the nature and timing of preserved organic matter in borehole PRGL1-4 from Northwestern Mediterranean Sea. This region is known as a transitional zone between the North Atlantic atmospheric circulation and the North African monsoon system. In the Gulf of Lion (SE France), increased inputs of organic matter from sediment-laden rivers occurred during warm substages of the last 200 kyr (MIS 5e, 5c, and 5a; MIS 6d, and 6b). Increased terrestrial organic matter are inferred from organic carbon isotopic composition (δ13Corg), and are interpreted as resulting from enhanced rainfall over the Rhone river catchment area. Such increase in terrestrial organic carbon induced enhancement of the primary productivity leading to the formation of local oxygen minimum zone as demonstrated by ∼3‰ values in δ15N. Comparison with regional paleohydrological records from the northern Mediterranean borderlands reveals the regional character of these pluvial events. Taking advantage of the location of PRGL1-4 borehole, out of Mediterranean cyclogenesis area, we suggest that the pluvial events recorded during warm substages of the last 200 kyr occurred in response to enhanced passage of North Atlantic atmospheric perturbation over the Gulf of Lion catchment area (especially over Rhone river watershed which represent 80% of the GoL catchment area), a scenario possibly similar to that encountered today during negative- NAO like conditions. At a regional scale, our data suggests that high rainfall events over the Gulf of Lion catchement area and the Rhone watershed occurred at the time of North African summer monsoon and the sapropel deposition in the Mediterranean basin, thus highlighting a close coupling between mid- (North Atlantic) and low-latitudes (monsoon) climate systems. Importantly, our geochemical evidence from the Gulf of Lion support an extra-Mediterranean source for the regional pluvial events described in ... Article in Journal/Newspaper North Atlantic North Atlantic oscillation Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Rhone ENVELOPE(158.733,158.733,-79.983,-79.983) Quaternary Science Reviews 205 182 192 |