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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) pilot campaign conducted approximately 300 km offshore of San Francisco over two weeks in October 2021. 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. Level 3 data are available in netCDF format with dimensions of profile number and depth.

Product Summary

Platforms
Ships
Instruments
CTD
Spatial Extent

N: 38.1 S: 36.3 E: -122.9 W: -125.4

Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2021-08-01 to 2021-11-30
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC)
Concept ID
C2574152934-POCLOUD
Data State
COMPLETE
Number of Files/Granules
1
Processing Level
3
Science Keywords
Salinity/Density ,
Fluorescence ,
Scattering ,
Oxygen ,
Conductivity ,
OCEAN TEMPERATURE PROFILES ,
Salinity ,
OCEAN SALINITY PROFILES

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

S-MODE. (2023). S-MODE Level 3 Shipboard uCTD and EcoCTD Measurements Version 1 [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/SMODE-RVECT3 Date Accessed: 2025-12-14

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
absolute_salinity EcoCTD Absolute Salinity Measurement g kg-1 double N/A 2 to 42 1
absolute_salinity_qc EcoCTD Absolute Salinity Measurement Quality Control 1 double N/A -1 to 1 1
backscatter_at_470nm EcoCTD backscattering at 470nm Measurement m-1 sr-1 double N/A 0 to 500 1
backscatter_at_470nm_qc EcoCTD backscattering at 470nm Measurement Quality Control 1 double N/A -1 to 1 1
backscatter_at_700nm EcoCTD backscattering at 700nm Measurement m-1 sr-1 double N/A 0 to 500 1
backscatter_at_700nm_qc EcoCTD backscattering at 700nm Measurement Quality Control 1 double N/A -1 to 1 1
chlorophyll_concentration EcoCTD Chlorophyll Concentration Measurement ug L-1 double N/A 0 to 500 1
chlorophyll_concentration_qc EcoCTD Chlorophyll Concentration Measurement Quality Control 1 double N/A -1 to 1 1
conductivity EcoCTD Conductivity Measurement S m-1 double N/A 0 to 42 1
conductivity_qc EcoCTD Conductivity Measurement Quality Control 1 double N/A -1 to 1 1
conservative_temp EcoCTD Conservative Temperature Measurement degree_C double N/A -2 to 30 1
conservative_temp_qc EcoCTD Conservative Temperature Measurement Quality Control 1 double N/A -1 to 1 1
latitude Latitude of EcoCTD Measurement degrees_north double N/A N/A 1
longitude Longitude of EcoCTD Measurement degrees_east double N/A N/A 1
O2sat EcoCTD Oxygen Saturation Measurement percent double N/A 0 to 150 1
O2_sat_qc EcoCTD Oxygen Saturation Measurement Quality Control 1 double N/A -1 to 1 1
O2_sensor_temp EcoCTD optode Temperature Measurement degree_C double N/A 0 to 40 1
O2_sensor_temp_qc EcoCTD optode Temperature Measurement Quality Control 1 double N/A -1 to 1 1
Phase_number see data report 1 double N/A 0 to 5 1
practical_salinity EcoCTD Practical Salinity Measurement 1 double N/A 2 to 42 1
practical_salinity_qc EcoCTD Practical Salinity Measurement Quality Control 1 double N/A -1 to 1 1
pressure Sea Pressure of EcoCTD Measurement dbar double N/A N/A 1
pressure_qc Sea Pressure Measurement Quality Control 1 double N/A -1 to 1 1
temperature EcoCTD Temperature degree_C double N/A -2 to 30 1
temperature_qc EcoCTD Temperature Quality Control 1 double N/A -1 to 1 1
time Time of EcoCTD Measurement days since 1950-01-01 double N/A N/A 1
time_qc Time Measurement Quality Control 1 double N/A -1 to 1 1
Transect_number see data report 1 double N/A 0 to 40 1
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