Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Sea surface and subsurface circulation dynamics off equatorial Peru during the last ∼17 kyr

Nürnberg, Dirk ; Böschen, Tebke ; Doering, Kristin LU orcid ; Mollier-Vogel, Elfi ; Raddatz, Jacek and Schneider, Ralph (2015) In Paleoceanography 30(7). p.984-999
Abstract

The complex deglacial to Holocene oceanographic development in the Gulf of Guayaquil (Eastern Equatorial Pacific) is reconstructed for sea surface and subsurface ocean levels from (isotope) geochemical proxies based on marine sediment cores. At sea surface, southern sourced Cold Coastal Water and tropical Equatorial Surface Water/Tropical Surface Water are intimately related. In particular since ∼10 ka, independent sea surface temperature proxies capturing different seasons emphasize the growing seasonal contrast in the Gulf of Guayaquil, which is in contrast to ocean areas further offshore. Cold Coastal Water became rapidly present in the Gulf of Guayaquil during the austral winter season in line with the strengthening of the Southeast... (More)

The complex deglacial to Holocene oceanographic development in the Gulf of Guayaquil (Eastern Equatorial Pacific) is reconstructed for sea surface and subsurface ocean levels from (isotope) geochemical proxies based on marine sediment cores. At sea surface, southern sourced Cold Coastal Water and tropical Equatorial Surface Water/Tropical Surface Water are intimately related. In particular since ∼10 ka, independent sea surface temperature proxies capturing different seasons emphasize the growing seasonal contrast in the Gulf of Guayaquil, which is in contrast to ocean areas further offshore. Cold Coastal Water became rapidly present in the Gulf of Guayaquil during the austral winter season in line with the strengthening of the Southeast Trades, while coastal upwelling off Peru gradually intensified and expanded northward in response to a seasonally changing atmospheric circulation pattern affecting the core locations intensively since 4 ka BP. Equatorial Surface Water, instead, was displaced and Tropical Surface Water moved northward together with the Equatorial Front. At subsurface, the presence of Equatorial Under Current-sourced Equatorial Subsurface Water was continuously growing, prominently since ∼10-8 ka B.P. During Heinrich Stadial 1 and large parts of the Bølling/Allerød, and similarly during short Holocene time intervals at ∼5.1-4 ka B.P. and ∼1.5-0.5 ka B.P., the admixture of Equatorial Subsurface Water was reduced in response to both short-term weakening of Equatorial Under Current strength from the northwest and emplacement by tropical Equatorial Surface Water, considerably warming the uppermost ocean layers.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
keywords
alkenones, deglaciation, equatorial E Pacific, foraminiferal geochemistry, Holocene, upper ocean hydrography
in
Paleoceanography
volume
30
issue
7
pages
16 pages
publisher
John Wiley & Sons Inc.
external identifiers
  • scopus:84939255413
ISSN
0883-8305
DOI
10.1002/2014PA002706
language
English
LU publication?
no
additional info
Publisher Copyright: ©2015. American Geophysical Union. All Rights Reserved.
id
1cd7fb2b-3f10-4bd1-8d05-f2b162bc4fb4
date added to LUP
2022-09-05 12:41:42
date last changed
2022-09-15 22:28:57
@article{1cd7fb2b-3f10-4bd1-8d05-f2b162bc4fb4,
  abstract     = {{<p>The complex deglacial to Holocene oceanographic development in the Gulf of Guayaquil (Eastern Equatorial Pacific) is reconstructed for sea surface and subsurface ocean levels from (isotope) geochemical proxies based on marine sediment cores. At sea surface, southern sourced Cold Coastal Water and tropical Equatorial Surface Water/Tropical Surface Water are intimately related. In particular since ∼10 ka, independent sea surface temperature proxies capturing different seasons emphasize the growing seasonal contrast in the Gulf of Guayaquil, which is in contrast to ocean areas further offshore. Cold Coastal Water became rapidly present in the Gulf of Guayaquil during the austral winter season in line with the strengthening of the Southeast Trades, while coastal upwelling off Peru gradually intensified and expanded northward in response to a seasonally changing atmospheric circulation pattern affecting the core locations intensively since 4 ka BP. Equatorial Surface Water, instead, was displaced and Tropical Surface Water moved northward together with the Equatorial Front. At subsurface, the presence of Equatorial Under Current-sourced Equatorial Subsurface Water was continuously growing, prominently since ∼10-8 ka B.P. During Heinrich Stadial 1 and large parts of the Bølling/Allerød, and similarly during short Holocene time intervals at ∼5.1-4 ka B.P. and ∼1.5-0.5 ka B.P., the admixture of Equatorial Subsurface Water was reduced in response to both short-term weakening of Equatorial Under Current strength from the northwest and emplacement by tropical Equatorial Surface Water, considerably warming the uppermost ocean layers.</p>}},
  author       = {{Nürnberg, Dirk and Böschen, Tebke and Doering, Kristin and Mollier-Vogel, Elfi and Raddatz, Jacek and Schneider, Ralph}},
  issn         = {{0883-8305}},
  keywords     = {{alkenones; deglaciation; equatorial E Pacific; foraminiferal geochemistry; Holocene; upper ocean hydrography}},
  language     = {{eng}},
  month        = {{07}},
  number       = {{7}},
  pages        = {{984--999}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Paleoceanography}},
  title        = {{Sea surface and subsurface circulation dynamics off equatorial Peru during the last ∼17 kyr}},
  url          = {{http://dx.doi.org/10.1002/2014PA002706}},
  doi          = {{10.1002/2014PA002706}},
  volume       = {{30}},
  year         = {{2015}},
}