Temperature, salinity, density and dissolved oxygen profiles from the World Ocean Database and Argo floats in the eastern South Pacific over the 1928-2018 period

Date 2020
Temporal extent 1928-09-18 -2018-02-21
Author(s) Auger Pierre-AmaëlORCID1, 2, Bento Joaquim PereiraORCID3, Hormazabal SamuelORCID1, Morales Carmen ElianaORCID4, Bustamante AdrianORCID1, 5
Affiliation(s) 1 : Instituto Milenio de Oceanografía (IMO) and Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
2 : Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Brest, France
3 : Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
4 : Instituto Milenio de Oceanografía (IMO) and Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile
5 : Instituto de Fomento Pesquero (IFOP), División de Investigación Pesquera, Valparaíso, Chile
DOI 10.17882/74336
Publisher SEANOE
Keyword(s) Oxygen minimum zone (OMZ), Oxycline depth, Subsurface eddy, Intrathermocline eddy, Mesoscale variability, OMZ boundaries
Abstract

In situ ocean vertical profiles of temperature, salinity, density and dissolved oxygen concentration in the eastern South Pacific were obtained over the period 1928-2018 from the World Ocean Database 2013 (18th september 1928 to 29th june 2015), the International Argo Program (23th november 2007 to 21st february 2018), and Argo profiles available from the Chilean community (31th october 2005 to 26th may 2011). Only quality controlled data were selected. The WOD2013 database is a compilation of profiles from ocean stations (OSD), some profiling floats not present in the Argo database (PFL), and CTD-O data (Conductivity-Temperature-Depth-Oxygen) obtained from several oceanographic cruises focused on the characterization of water-masses distribution from the mesoscale to regional-basin scales. Using WOD2013 and Argo data, the vertical variability of the oxygen minimum zone (OMZ) in the eastern South Pacific (ESP; 0-40°S) was characterized in terms of the influence exerted by anticyclonic intra-thermocline eddies (ITEs), subsurface intensified mesoscale features frequently generated in the coastal upwelling zone off Peru and Chile. The unique lens-shape signature that ITEs leave on temperature, salinity and dissolved oxygen vertical distributions was used as a proxy to assess their influence on the vertical OMZ boundaries and thickness. Correlation analyses were performed between anomalous depth (and vertical displacements) of oxyclines and isopycnals/isotherms, together with an objective eddy detection method based on satellite altimetry to identify the location of such profiles (i.e. outside or inside eddies of cyclonic and anticyclonic nature). Results indicate that most of the vertical fluctuations in the climatological OMZ take a lens-shape signature, and that those at mesoscale are largely due to ITEs. ITEs are a main driver of the upper oxycline variability in the coastal band and the coastal transition zone (3-10° from the coast) and also beyond it at mid-latitudes (12-26°S). The influence of ITEs on the upper and lower oxycline variability is mostly found within the horizontal (offshore) climatological boundary of the OMZ, suggesting that ITEs play a role in the OMZ offshore extension.

Licence CC-BY-NC
Utilisation The present dataset contains in situ ocean vertical profiles of temperature, salinity and dissolved oxygen concentration in the eastern South Pacific obtained from the World Ocean Database 2013 ("OSD", "CTD" and "PFL" data; http://www.nodc.noaa.gov/OC5/WOD13), the International Argo Program ("ARG" data; downloaded from http://www.argo.ucsd.edu on 23 February 2018), and Argo profiles available from the Chilean community ("ARC" data; O. Ulloa, pers. com.). To avoid sampling uncertainties, only quality-controlled data were selected. The profiles with maximum depth < 375 m were also avoided. The different columns of the text files are: 1-Index of profile, 2-Index of cruise, 3-Year, 4-Month, 5-Day, 6-Longitude (°), 7-Latitude (°), 8-Depth (m), 9-Temperature (°C), 10-Salinity (PSU), 11-Density (kg m-3), 12-Dissolved Oxygen (ml L-1). The cruise names of all samples are also provided in companion files.
Acknowledgments Thanks to the international World Ocean Database and Argo projects, and the national programs that contribute to it. Thanks also to O. Ulloa and O. Pizarro for providing data from Argo floats deployed off Chile with the support of the Agouron Institute (Grant AI-MME1.05), to Cesar Hormazábal, Manuel Castillo and Luis Pizarro for their help with float deployment and to Winston Rojas, Ricardo De Pol-Holz and Salvador Ramírez for data acquisition and processing.
Data
File Size Format Processing Access
OSD data from the World Ocean Database 2013 (http://www.nodc.noaa.gov/OC5/WOD13). 19 MB TEXTE Quality controlled data Open access
Name of cruises in the OSD data from the World Ocean Database 2013 (http://www.nodc.noaa.gov/OC5/WOD13). 935 KB TEXTE Quality controlled data Open access
CTD data from the World Ocean Database 2013 (http://www.nodc.noaa.gov/OC5/WOD13). 734 MB TEXTE Quality controlled data Open access
Name of cruises in the CTD data from the World Ocean Database 2013 (http://www.nodc.noaa.gov/OC5/WOD13). 34 MB TEXTE Quality controlled data Open access
PFL data from the World Ocean Database 2013 (http://www.nodc.noaa.gov/OC5/WOD13). 144 MB TEXTE Quality controlled data Open access
Name of cruises in the PFL data from the World Ocean Database 2013 (http://www.nodc.noaa.gov/OC5/WOD13). 6 MB TEXTE Quality controlled data Open access
Argo data from the International Argo Program (2000-2018; downloaded from http://www.argo.ucsd.edu on 23 February 2018). 47 MB TEXTE Quality controlled data Open access
Name of cruises in the Argo data from the International Argo Program (2000-2018; downloaded from http://www.argo.ucsd.edu on 23 February 2018). 1 MB TEXTE Quality controlled data Open access
Argo data available from the Chilean community (2005-2011; O. Ulloa, pers. com.). 10 MB TEXTE Quality controlled data Open access
Name of cruises in Argo data available from the Chilean community (2005-2011; O. Ulloa, pers. com.). 402 KB TEXTE Quality controlled data Open access
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How to cite 

Auger Pierre-Amaël, Bento Joaquim Pereira, Hormazabal Samuel, Morales Carmen Eliana, Bustamante Adrian (2020). Temperature, salinity, density and dissolved oxygen profiles from the World Ocean Database and Argo floats in the eastern South Pacific over the 1928-2018 period. SEANOE. https://doi.org/10.17882/74336


In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :


Auger, P.-A., Bento, J. P., Hormazabal, S., Morales, C. E., & Bustamante, A. (2020). Mesoscale variability in the boundaries of the oxygen minimum zone in the eastern South Pacific: influence of intrathermocline eddies. Journal of Geophysical Research: Oceans (Accepted)