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S-MODE Shipboard uCTD and EcoCTD Measurements Version 1

Published by NASA/JPL/PODAAC | National Aeronautics and Space Administration | Catalog Last Checked: September 02, 2026 at 12:34 AM | Dataset Last Updated: September 01, 2026
This dataset contains shipboard Underway conductivity, temperature, and depth (UCDT) measurements taken during the Sub-Mesoscale Ocean Dynamics Experiment (S-MODE) field campaign. The experiment was conducted approximately 300 km offshore of San Francisco, during a pilot campaign that spanned two weeks in October 2021, and two intensive operating periods in Fall 2022 and Spring 2023. S-MODE aims to understand how ocean dynamics acting on short spatial scales influence the vertical exchange of physical and biological variables in the ocean. The Underway CTD system contains a standard UCDT probe measuring conductivity, temperature, and pressure, as well as an augmented EcoCDT probe that concurrently measures both hydrographic and bio-optical data including conductivity, temperature, pressure, dissolved oxygen concentration, chlorophyll-fluorescence, and particulate backscatter at two different wavelengths. The level 2 data herein combines measurements from both the UCDT and EcoCDT into a single dataset, where for each variable, all profiles are binned onto a 5m vertical grid and merged into a 2-D matrix. Additional computed variables include backscatter baseline signal and backscatter spike signal. Data are available in netCDF format.

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Complete Metadata
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description This dataset contains shipboard Underway conductivity, temperature, and depth (UCDT) measurements taken during the Sub-Mesoscale Ocean Dynamics Experiment (S-MODE) field campaign. The experiment was conducted approximately 300 km offshore of San Francisco, during a pilot campaign that spanned two weeks in October 2021, and two intensive operating periods in Fall 2022 and Spring 2023. S-MODE aims to understand how ocean dynamics acting on short spatial scales influence the vertical exchange of physical and biological variables in the ocean. The Underway CTD system contains a standard UCDT probe measuring conductivity, temperature, and pressure, as well as an augmented EcoCDT probe that concurrently measures both hydrographic and bio-optical data including conductivity, temperature, pressure, dissolved oxygen concentration, chlorophyll-fluorescence, and particulate backscatter at two different wavelengths. The level 2 data herein combines measurements from both the UCDT and EcoCDT into a single dataset, where for each variable, all profiles are binned onto a 5m vertical grid and merged into a 2-D matrix. Additional computed variables include backscatter baseline signal and backscatter spike signal. Data are available in netCDF format.
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identifier 10.5067/SMODE-RVECT
keyword 
[
  "earth-science-ocean-chemistry-oceans-oxygen",
  "earth-science-ocean-optics-oceans-fluorescence",
  "earth-science-ocean-optics-oceans-scattering",
  "earth-science-ocean-temperature-oceans-ocean-temperature-profiles",
  "earth-science-salinity-density-oceans",
  "earth-science-salinity-density-oceans-conductivity",
  "earth-science-salinity-density-oceans-ocean-salinity",
  "earth-science-salinity-density-oceans-salinity"
]
license https://www.usa.gov/government-works
modified 2026-09-01
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  "name": "NASA/JPL/PODAAC",
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spatial 
"["CARTESIAN", [{"NorthBoundingCoordinate": 38.1, "WestBoundingCoordinate": -125.4, "EastBoundingCoordinate": -122.9, "SouthBoundingCoordinate": 36.3}]]"
temporal 2021-08-01/2023-05-31
theme 
[
  "Earth Science"
]
title S-MODE Shipboard uCTD and EcoCTD Measurements Version 1

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