Climate-driven changes in sedimentation rate influence phosphorus burial along continental margins of the northwestern Mediterranean
The burial of phosphorus (P) in continental margin sediments is a critical component of the marine reactive P budget, and thus an important factor in marine biological productivity. We determined downcore records of P from a site drilled on the upper slope of the Gulf of Lions (PRGL 1), northwestern...
Main Authors: | , , , , , |
---|---|
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2018
|
Subjects: | |
Online Access: | https://hdl.handle.net/1805/15875 |
id |
ftiupui:oai:scholarworks.iupui.edu:1805/15875 |
---|---|
record_format |
openpolar |
spelling |
ftiupui:oai:scholarworks.iupui.edu:1805/15875 2023-10-09T21:54:07+02:00 Climate-driven changes in sedimentation rate influence phosphorus burial along continental margins of the northwestern Mediterranean Cortina, Aleix Filippelli, Gabriel Ochoa, Diana Sierro, Francisco Javier Flores, José-Abel Grimalt, Joan O. Earth Sciences, School of Science 2018 application/pdf https://hdl.handle.net/1805/15875 en eng Elsevier 10.1016/j.palaeo.2018.03.010 Palaeogeography, Palaeoclimatology, Palaeoecology Cortina, A., Filippelli, G., Ochoa, D., Sierro, F. J., Flores, J.-A., & Grimalt, J. O. (2018). Climate-driven changes in sedimentation rate influence phosphorus burial along continental margins of the northwestern Mediterranean. Palaeogeography, Palaeoclimatology, Palaeoecology. https://doi.org/10.1016/j.palaeo.2018.03.010 https://hdl.handle.net/1805/15875 Publisher Policy Author paleoredox phosphorus paleoproductivity Gulf of Lions Article 2018 ftiupui 2023-09-22T14:25:33Z The burial of phosphorus (P) in continental margin sediments is a critical component of the marine reactive P budget, and thus an important factor in marine biological productivity. We determined downcore records of P from a site drilled on the upper slope of the Gulf of Lions (PRGL 1), northwestern Mediterranean Sea. Changes in total P content were monitored from Marine Isotope Stage (MIS) 6 to MIS 11. In addition, in two selected intervals (248–277 ka and 306–342 ka) the total P record was expanded by adding detailed geochemical analyses of the various P fractions, including oxyhydroxide-associated P, authigenic P, detrital P and organic P. Increased sedimentation rates during glacials owing to seaward migration of the Rhone's mouth, enhanced the burial of reactive P (oxyhydroxide-associated + authigenic + organic) phases by decreasing its time at the reactive sediment/water interface, in turn resulting in increasing proportion of authigenic to detrital phosphorus. The inverse was found for interglacial stages. The effects of glacial/interglacial variation in sedimentation rate over P geochemistry resulted in changes in sediment-water interface oxygenation, as well as in the efficiency of P burial, as shown by (C:P)org and Corg:Preact proxies respectively. Two events of high P deposition associated with authigenic P formation, at 335 ka (Paut1) and 275 ka (Paut2), were associated with periods of rapid disintegration of North Atlantic ice sheets leading to Ice Rafted Debris (IRD) deposition. These high P deposition events appear to be linked to short warm periods that followed cold episodes. Enhanced continental runoff owing to more humid conditions during short warm episodes could play a critical role for enhanced biogenic productivity and posterior authigenic P accumulation. Article in Journal/Newspaper North Atlantic Indiana University - Purdue University Indianapolis: IUPUI Scholar Works |
institution |
Open Polar |
collection |
Indiana University - Purdue University Indianapolis: IUPUI Scholar Works |
op_collection_id |
ftiupui |
language |
English |
topic |
paleoredox phosphorus paleoproductivity Gulf of Lions |
spellingShingle |
paleoredox phosphorus paleoproductivity Gulf of Lions Cortina, Aleix Filippelli, Gabriel Ochoa, Diana Sierro, Francisco Javier Flores, José-Abel Grimalt, Joan O. Climate-driven changes in sedimentation rate influence phosphorus burial along continental margins of the northwestern Mediterranean |
topic_facet |
paleoredox phosphorus paleoproductivity Gulf of Lions |
description |
The burial of phosphorus (P) in continental margin sediments is a critical component of the marine reactive P budget, and thus an important factor in marine biological productivity. We determined downcore records of P from a site drilled on the upper slope of the Gulf of Lions (PRGL 1), northwestern Mediterranean Sea. Changes in total P content were monitored from Marine Isotope Stage (MIS) 6 to MIS 11. In addition, in two selected intervals (248–277 ka and 306–342 ka) the total P record was expanded by adding detailed geochemical analyses of the various P fractions, including oxyhydroxide-associated P, authigenic P, detrital P and organic P. Increased sedimentation rates during glacials owing to seaward migration of the Rhone's mouth, enhanced the burial of reactive P (oxyhydroxide-associated + authigenic + organic) phases by decreasing its time at the reactive sediment/water interface, in turn resulting in increasing proportion of authigenic to detrital phosphorus. The inverse was found for interglacial stages. The effects of glacial/interglacial variation in sedimentation rate over P geochemistry resulted in changes in sediment-water interface oxygenation, as well as in the efficiency of P burial, as shown by (C:P)org and Corg:Preact proxies respectively. Two events of high P deposition associated with authigenic P formation, at 335 ka (Paut1) and 275 ka (Paut2), were associated with periods of rapid disintegration of North Atlantic ice sheets leading to Ice Rafted Debris (IRD) deposition. These high P deposition events appear to be linked to short warm periods that followed cold episodes. Enhanced continental runoff owing to more humid conditions during short warm episodes could play a critical role for enhanced biogenic productivity and posterior authigenic P accumulation. |
author2 |
Earth Sciences, School of Science |
format |
Article in Journal/Newspaper |
author |
Cortina, Aleix Filippelli, Gabriel Ochoa, Diana Sierro, Francisco Javier Flores, José-Abel Grimalt, Joan O. |
author_facet |
Cortina, Aleix Filippelli, Gabriel Ochoa, Diana Sierro, Francisco Javier Flores, José-Abel Grimalt, Joan O. |
author_sort |
Cortina, Aleix |
title |
Climate-driven changes in sedimentation rate influence phosphorus burial along continental margins of the northwestern Mediterranean |
title_short |
Climate-driven changes in sedimentation rate influence phosphorus burial along continental margins of the northwestern Mediterranean |
title_full |
Climate-driven changes in sedimentation rate influence phosphorus burial along continental margins of the northwestern Mediterranean |
title_fullStr |
Climate-driven changes in sedimentation rate influence phosphorus burial along continental margins of the northwestern Mediterranean |
title_full_unstemmed |
Climate-driven changes in sedimentation rate influence phosphorus burial along continental margins of the northwestern Mediterranean |
title_sort |
climate-driven changes in sedimentation rate influence phosphorus burial along continental margins of the northwestern mediterranean |
publisher |
Elsevier |
publishDate |
2018 |
url |
https://hdl.handle.net/1805/15875 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Author |
op_relation |
10.1016/j.palaeo.2018.03.010 Palaeogeography, Palaeoclimatology, Palaeoecology Cortina, A., Filippelli, G., Ochoa, D., Sierro, F. J., Flores, J.-A., & Grimalt, J. O. (2018). Climate-driven changes in sedimentation rate influence phosphorus burial along continental margins of the northwestern Mediterranean. Palaeogeography, Palaeoclimatology, Palaeoecology. https://doi.org/10.1016/j.palaeo.2018.03.010 https://hdl.handle.net/1805/15875 |
op_rights |
Publisher Policy |
_version_ |
1779317565696245760 |