Pelagic-benthic coupling within an upwelling system of the subtropical northeast Atlantic over the last 35 ka BP
McKay, Claire LU ; Filipsson, Helena LU
; Romero, O. E.
; Stuut, J. -B. W.
and Donner, B.
(2014)
In Quaternary Science Reviews
106.
p.299-315
- Abstract
- We present a high resolution, multiproxy study of the relationship between pelagic and benthic environments of a coastal upwelling system in the subtropical NE Atlantic Ocean. Marine sediments corresponding to late MIS3 to the Holocene in the radiocarbon dated core GeoB7926, retrieved off Mauritania (21 degrees N) were analysed to reconstruct productivity in surface waters and its linkage to deep waters during the last 35 ka BP. High latitude cold events and changes in atmospheric and oceanographic dynamics influenced upwelling intensity over this time period. Subsequently, this caused changes in primary productivity off this low-latitude coastal upwelling locality. The benthic foraminiferal fauna displays four main community shifts... (More)
- We present a high resolution, multiproxy study of the relationship between pelagic and benthic environments of a coastal upwelling system in the subtropical NE Atlantic Ocean. Marine sediments corresponding to late MIS3 to the Holocene in the radiocarbon dated core GeoB7926, retrieved off Mauritania (21 degrees N) were analysed to reconstruct productivity in surface waters and its linkage to deep waters during the last 35 ka BP. High latitude cold events and changes in atmospheric and oceanographic dynamics influenced upwelling intensity over this time period. Subsequently, this caused changes in primary productivity off this low-latitude coastal upwelling locality. The benthic foraminiferal fauna displays four main community shifts corresponding to fundamental climatic events, first of all during late MIS3 (35 28 ka BP), secondly from 28 to 19 ka BP (including Heinrich event 2 and the LGM), thirdly within Heinrich event 1, the Bolling Allerod and the Younger Diyas (18-11.5 ka BP) and finally during the Holocene (11.5-0 ka BP). In particular, strong pelagic benthic coupling is apparent in MIS 3, as demonstrated by increased primary productivity, indicated by moderate DAR and the dominance of benthic foraminiferal species which prefer fresh phytodetritus. A decline in upwelling intensity and nutrient availability follows, which resulted in a proportionately larger amount of older, degraded matter, provoking a shift in the benthic foraminifera fauna composition. This rapid response of the benthic environment continues with a progressive increase in upwelling intensity due to sea level and oceanographic changes and according high surface production during the LGM. During Heinrich event 1 and the Younger Dryas, extreme levels of primary production actually hindered benthic environment through the development of low oxygen conditions. After this period, a final change in benthic foraminiferal community composition occurs which indicates a return to more oxygenated conditions during the Holocene. (C) 2014 Elsevier Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/5070079
- author
- McKay, Claire
LU
; Filipsson, Helena
LU
; Romero, O. E.
; Stuut, J. -B. W.
and Donner, B.
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Pelagic-benthic, Upwelling, Palaeoproductivity, Benthic foraminifera, Subtropical NE Atlantic
- in
- Quaternary Science Reviews
- volume
- 106
- pages
- 299 - 315
- publisher
- Elsevier
- external identifiers
-
- wos:000348010900019
- scopus:85027922070
- ISSN
- 0277-3791
- DOI
- 10.1016/j.quascirev.2014.04.027
- language
- English
- LU publication?
- yes
- id
- 825e9362-199b-4d9e-b5b8-b09c48f79641 (old id 5070079)
- date added to LUP
- 2016-04-01 10:34:22
- date last changed
- 2024-01-06 20:00:52
@article{825e9362-199b-4d9e-b5b8-b09c48f79641,
abstract = {{We present a high resolution, multiproxy study of the relationship between pelagic and benthic environments of a coastal upwelling system in the subtropical NE Atlantic Ocean. Marine sediments corresponding to late MIS3 to the Holocene in the radiocarbon dated core GeoB7926, retrieved off Mauritania (21 degrees N) were analysed to reconstruct productivity in surface waters and its linkage to deep waters during the last 35 ka BP. High latitude cold events and changes in atmospheric and oceanographic dynamics influenced upwelling intensity over this time period. Subsequently, this caused changes in primary productivity off this low-latitude coastal upwelling locality. The benthic foraminiferal fauna displays four main community shifts corresponding to fundamental climatic events, first of all during late MIS3 (35 28 ka BP), secondly from 28 to 19 ka BP (including Heinrich event 2 and the LGM), thirdly within Heinrich event 1, the Bolling Allerod and the Younger Diyas (18-11.5 ka BP) and finally during the Holocene (11.5-0 ka BP). In particular, strong pelagic benthic coupling is apparent in MIS 3, as demonstrated by increased primary productivity, indicated by moderate DAR and the dominance of benthic foraminiferal species which prefer fresh phytodetritus. A decline in upwelling intensity and nutrient availability follows, which resulted in a proportionately larger amount of older, degraded matter, provoking a shift in the benthic foraminifera fauna composition. This rapid response of the benthic environment continues with a progressive increase in upwelling intensity due to sea level and oceanographic changes and according high surface production during the LGM. During Heinrich event 1 and the Younger Dryas, extreme levels of primary production actually hindered benthic environment through the development of low oxygen conditions. After this period, a final change in benthic foraminiferal community composition occurs which indicates a return to more oxygenated conditions during the Holocene. (C) 2014 Elsevier Ltd. All rights reserved.}},
author = {{McKay, Claire and Filipsson, Helena and Romero, O. E. and Stuut, J. -B. W. and Donner, B.}},
issn = {{0277-3791}},
keywords = {{Pelagic-benthic; Upwelling; Palaeoproductivity; Benthic foraminifera; Subtropical NE Atlantic}},
language = {{eng}},
pages = {{299--315}},
publisher = {{Elsevier}},
series = {{Quaternary Science Reviews}},
title = {{Pelagic-benthic coupling within an upwelling system of the subtropical northeast Atlantic over the last 35 ka BP}},
url = {{http://dx.doi.org/10.1016/j.quascirev.2014.04.027}},
doi = {{10.1016/j.quascirev.2014.04.027}},
volume = {{106}},
year = {{2014}},
}