Dataset: Depth-gridded and Density-gridded ODZs

Name: An atlas of depth-gridded and density-gridded interpolated and un-interpolated oxygen deficient zones (ODZs) in the Eastern tropical and subtropical Pacific Ocean
Published: 2021-11-30
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.865316.1

Spatial Extent: N:57 E:-65.5 S:-70.5 W:-180

Project:

A microbe’s perspective on the marine nitrogen budget (Microbe Perspective)

EAGER: Testing the Galápagos as a long-term monitoring site for nitrous oxide emissions from the Pacific oxygen deficient zones (ETP ODZ mapping)

Solving Microbial Mysteries with Autonomous Technology (Microbial Mysteries)

Principal Investigator:

Andrew R. Babbin (Massachusetts Institute of Technology, MIT)

Co-Principal Investigator:

Jarek Kwiecinski (Massachusetts Institute of Technology, MIT)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2021-11-30

Restricted:

Validated:

Yes

Current State:

Final no updates expected

An atlas of depth-gridded and density-gridded interpolated and un-interpolated oxygen deficient zones (ODZs) in the Eastern tropical and subtropical Pacific Ocean

Abstract:

This dataset is made up of four NetCDF files, comprising an atlas of depth-gridded and density-gridded interpolated and un-interpolated Pacific oxygen deficient zones.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2021-11-30	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.865316.1	2021-11-30

Description

This dataset includes four NetCDF files, nc_density.nc, nc_density_DIVA.nc, nc_depth.nc, and nc_depth_DIVA.nc. A description of the data files is attached as a Supplemental File.

Methods & Sampling

Data from Clark-style electrode and optode sensors from CTD and Argo deployments were compiled for the eastern tropical North and South Pacific oxygen deficient zones. Data were compiled from all cruises that uploaded their data to R2R or CCHDO before April 2019, and all Argo profiles with O2 measurements from January 2000 to August 2021. The Argo data were downloaded via the Argo data selection tool at https://dataselection.euro-argo.eu/. We included both delayed-mode and real-time adjusted profiles for which there was oxygen, temperature, and salinity data. Only measurements that were flagged as good quality were downloaded.

The specific depths of functional anoxia were defined as the locations where the derivative of oxygen with respect to depth and the concentration itself were sufficiently low. The data were then gridded with respect to depth (pressure) at 20 dbar intervals or density at 0.1 kg/m3 intervals, and either interpolated with DIVA (version 4.7.2) or not. For full methods, please see the relevant manuscript written by Kwiecinski and Babbin.

Primary depth data were gridded on a 0.5º x 0.5º x 20 dbar grid.
Primary density data were gridded on a 0.5º x 0.5º x 0.1 kg/m^3 (sigma-theta) grid.

The non-interpolated data span the rectangles bounded at the NW and SE by (57N, -65.5E) and (-70.5N, -180E). The interpolated (DIVA) data NW and SE bounds are (37N, -70.5E) and (-32N, -156.5E). Grids cells that are in the Atlantic, on land, or beyond the minimum and maximum latitudes and longitudes of the oxygen deficient zones are marked with NaN.

Data Processing Description

Data were processed using R version 4.0.0.

Data Files

File
nc_density.nc (NetCDF, 28.53 MB) MD5:c85024897d6472cfa668b450f483434d Description: Atlas of density-gridded, un-interpolated Pacific oxygen deficient zones from data compilation. Primary data were gridded on a 0.5º x 0.5º x 0.1 kg/m^3 (sigma-theta) grid. NetCDF header information: netcdf nc_density { dimensions: Latitude = 256 ; Longitude = 230 ; Sigma\ Theta = 25 ; variables: double Latitude(Latitude) ; Latitude:units = "degrees" ; Latitude:long_name = "Latitude" ; double Longitude(Longitude) ; Longitude:units = "degrees" ; Longitude:long_name = "Longitude" ; double Sigma\ Theta(Sigma\ Theta) ; Sigma\ Theta:units = "kg/m^3" ; Sigma\ Theta:long_name = "Sigma Theta" ; float fODZ(Sigma\ Theta, Longitude, Latitude) ; float O2(Sigma\ Theta, Longitude, Latitude) ; O2:units = "umol/kg" ; float deriv(Sigma\ Theta, Longitude, Latitude) ; deriv:units = "umol/(kg*dbar)" ; float IR(Sigma\ Theta, Longitude, Latitude) ; float topDensity(Longitude, Latitude) ; topDensity:units = "kg/m^3" ; float maxDerivDensity(Longitude, Latitude) ; maxDerivDensity:units = "kg/m^3" ; float numObs(Sigma\ Theta, Longitude, Latitude) ; } Variable descriptions: Name,Description,Units deriv,vertical derivative of O2 with depth,umol/kg / dbar fODZ,fraction of observations identified as ODZ,[fraction 0-1] IR,intrusion rate of O2 into ODZ,[fraction 0-1] Latitude,spatial variable for latitude,degrees Longitude,spatial variable for longitude,degrees maxDerivDensity,density of maximum vertical O2 derivative,kg/m^3 numObs,number of observations in a grid cell,[unitless] O2,oxygen concentration from literature,umol/kg Sigma_Theta,spatial variable for density (sigT units),kg/m^3 topDensity,density of top of ODZ,kg/m^3
nc_density_DIVA.nc (NetCDF, 4.31 MB) MD5:6554864818ff65232a355439b6c4ef38 Description: Atlas of density-gridded, interpolated Pacific oxygen deficient zones from data compilation. Primary data were gridded on a 0.5º x 0.5º x 0.1 kg/m^3 (sigma-theta) grid. NetCDF header information: netcdf nc_density_DIVA { dimensions: Longitude = 173 ; Latitude = 139 ; Density = 22 ; variables: double Longitude(Longitude) ; Longitude:units = "degrees" ; Longitude:long_name = "Longitude" ; double Latitude(Latitude) ; Latitude:units = "degrees" ; Latitude:long_name = "Latitude" ; double Density(Density) ; Density:units = "kg/m^3" ; Density:long_name = "Density" ; float fODZ(Density, Latitude, Longitude) ; float fODZError(Density, Latitude, Longitude) ; float topDensity(Latitude, Longitude) ; topDensity:units = "kg/m^3" ; float botDensity(Latitude, Longitude) ; botDensity:units = "kg/m^3" ; float MaxfODZ(Latitude, Longitude) ; } Variable descriptions: Name,Description,Units botDensity,density of bottom of ODZ,kg/m^3 Density,spatial variable for density (sigT units),kg/m^3 fODZ,fraction of observations identified as ODZ,[fraction 0-1] fODZError,reported DIVA error in fODZ interpolation,[fraction 0-1] Latitude,spatial variable for latitude,degrees Longitude,spatial variable for longitude,degrees MaxfODZ,maximum fODZ for each grid cell,[fraction 0-1] topDensity,density of top of ODZ,kg/m^3
nc_depth.nc (NetCDF, 56.83 MB) MD5:d0afb623a8d1146f8815cdeb9fbfb797 Description: Atlas of depth-gridded, un-interpolated Pacific oxygen deficient zones from data compilation. Primary data were gridded on a 0.5º x 0.5º x 20 m grid. NetCDF header information: netcdf nc_depth { dimensions: Latitude = 256 ; Longitude = 230 ; Depth = 50 ; variables: double Latitude(Latitude) ; Latitude:units = "degrees" ; Latitude:long_name = "Latitude" ; double Longitude(Longitude) ; Longitude:units = "degrees" ; Longitude:long_name = "Longitude" ; double Depth(Depth) ; Depth:units = "dbar" ; Depth:long_name = "Depth" ; float fODZ(Depth, Longitude, Latitude) ; float O2(Depth, Longitude, Latitude) ; O2:units = "umol/kg" ; float deriv(Depth, Longitude, Latitude) ; deriv:units = "umol/(kg*dbar)" ; float IR(Depth, Longitude, Latitude) ; float topDepth(Longitude, Latitude) ; topDepth:units = "dbar" ; float maxDerivDepth(Longitude, Latitude) ; maxDerivDepth:units = "dbar" ; float thickness(Longitude, Latitude) ; thickness:units = "dbar" ; float numObs(Depth, Longitude, Latitude) ; } Variable descriptions: Name,Description,Units Depth,spatial variable for depth,dbar deriv,vertical derivative of O2 with depth,umol/kg / dbar fODZ,fraction of observations identified as ODZ,[fraction 0-1] IR,intrusion rate of O2 into ODZ,[fraction 0-1] Latitude,spatial variable for latitude,degrees Longitude,spatial variable for longitude,degrees maxDerivDepth,depth of maximum vertical O2 derivative,dbar numObs,number of observations in a grid cell,[unitless] O2,oxygen concentration from literature,umol/kg thickness,thickness of ODZ,dbar topDepth,depth of top of ODZ,dbar
nc_depth_DIVA.nc (NetCDF, 9.36 MB) MD5:9ebd4443727a61ec589f54f18f16ff7e Description: Atlas of depth-gridded, interpolated Pacific oxygen deficient zones from data compilation. Primary data were gridded on a 0.5º x 0.5º x 20 m grid. NetCDF header information: netcdf nc_depth_DIVA { dimensions: Longitude = 173 ; Latitude = 139 ; Depth = 49 ; variables: double Longitude(Longitude) ; Longitude:units = "degrees" ; Longitude:long_name = "Longitude" ; double Latitude(Latitude) ; Latitude:units = "degrees" ; Latitude:long_name = "Latitude" ; double Depth(Depth) ; Depth:units = "dbar" ; Depth:long_name = "Depth" ; float fODZ(Depth, Latitude, Longitude) ; float fODZError(Depth, Latitude, Longitude) ; float topDepth(Latitude, Longitude) ; topDepth:units = "dbar" ; float botDepth(Latitude, Longitude) ; botDepth:units = "dbar" ; float thickness(Latitude, Longitude) ; thickness:units = "dbar" ; float maxFODZ(Latitude, Longitude) ; } Variable descriptions: botDepth,depth of bottom of ODZ,dbar Depth,spatial variable for depth,dbar fODZ,fraction of observations identified as ODZ,[fraction 0-1] fODZError,reported DIVA error in fODZ interpolation,[fraction 0-1] Latitude,spatial variable for latitude,degrees Longitude,spatial variable for longitude,degrees maxFODZ,maximum fODZ for each grid cell,[fraction 0-1] thickness,thickness of ODZ,dbar topDepth,depth of top of ODZ,dbar

Supplemental Files

File
ODZ_data_file_descriptions.txt filename: Babbin_ODZ_data_file_descriptions.txt (Octet Stream, 6.24 KB) MD5:e36adf7644e7d4c7f3a5f5dcf693cb68 Description of the four NetCDF files associated with dataset 865316 (PI: Andrew Babbin)