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Isotopic Characterization of Water Masses in the Southeast Pacific Region: Paleoceanographic Implications

Reyes-Macaya, Dharma
[1]; 
Hoogakker, Babette
[2]; 
Martinez-Mendez, Gema
[3]; 
Llanillo, Pedro J.
[3]; 
Grasse, Patricia
[4]; 
Mohtadi, Mahyar
[1]; 
Mix, Alan
[5]; 
Leng, Melanie J.
[6]; 
Struck, Ulrich
[7]; 
McCorkle, Daniel C.
[8]; 
Troncoso, Macarena
[9]; 
Gayo, Eugenia M.
[10]; 
Lange, Carina B.
[11]; 
Farias, Laura
[10]; 
Carhuapoma, Wilson
[12]; 
Graco, Michelle
[12]; 
Cornejo-D'Ottone, Marcela
[13]; 
[14]; 
Fernandez, Camila
[11]; 
Narvaez, Diego
[11]; 
Vargas, Cristian A.
[15]; 
Garcia-Araya, Francisco
[11]; 
Hebbeln, Dierk
[1]
  • 1
    University of Bremen
  • 2
    Heriot Watt University
  • 3
    Helmholtz Association
  • 4
    Deutsch Zentrum Integrat Biodiversitatsforsch
  • 5
    Oregon State University
  • 6
    UK Research & Innovation (UKRI)
  • 7
    Leibniz Institut fur Evolutions und Biodiversitatsforschung
  • 8
    Woods Hole Oceanographic Institution
  • 9
    Universidad de Chile
  • 10
    Nucleo Milenio UPWELL
  • 11
    Universidad de Concepcion
  • 12
    IMARPE Inst Mar Peru
  • 13
    Pontificia Universidad Catolica de Valparaiso
  • 14
    Centro de Investigación Gaia Antártica  
  • 15
    Inst Milenio Socioecol Costera
DOI
Date Issued
2022-1
Type
Artículo
Journal
Journal of Geophysical Research: Oceans
ISSN
2169-9275
2169-9291
Open Access
green
Volume
127
Links
In this study, we used stable isotopes of oxygen (delta O-18), deuterium (delta D), and dissolved inorganic carbon (delta C-13(DIC)) in combination with temperature, salinity, oxygen, and nutrient concentrations to characterize the coastal (71 degrees-78 degrees W) and an oceanic (82 degrees-98 degrees W) water masses (SAAW-Subantarctic Surface Water; STW-Subtropical Water; ESSW-Equatorial Subsurface water; AAIW-Antarctic Intermediate Water; PDW-Pacific Deep Water) of the Southeast Pacific (SEP). The results show that delta O-18 and delta D can be used to differentiate between SAAW-STW, SAAW-ESSW, and ESSW-AAIW. delta C-13(DIC) signatures can be used to differentiate between STW-ESSW (oceanic section), SAAW-ESSW, ESSW-AAIW, and AAIW-PDW. Compared with the oceanic section, our new coastal section highlights differences in both the chemistry and geometry of water masses above 1,000 m. Previous paleoceanographic studies using marine sediments from the SEP continental margin used the present-day hydrological oceanic transect to compare against, as the coastal section was not sufficiently characterized. We suggest that our new results of the coastal section should be used for past characterizations of the SEP water masses that are usually based on continental margin sediment samples.
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