S-MODE Seaglider Observations: Ocean Profiles from Autonomous Vehicles

Approximately 300 km offshore of San Francisco, autonomous Seagliders collected vertical profiles of temperature, dissolved oxygen, salinity, and other variables during the Sub-Mesoscale Ocean Dynamics Experiment (S-MODE). The dataset covers two intensive operating periods in Fall 2022 and Spring 2023, with gliders diving to depths of up to 1000 meters. It supports research into how short-scale ocean dynamics influence the vertical exchange of physical and biological properties.

Use Cases

• Analyzing vertical structure of water properties based on temperature and salinity profiles.
• Investigating dissolved oxygen distribution and potential hypoxic zones.
• Studying sub-mesoscale frontal dynamics and their role in vertical transport.
• Validating satellite-derived ocean color data with in-situ chlorophyll and scattering measurements.
• Assessing the performance of autonomous underwater vehicle (AUV) sampling strategies for ocean campaigns.

Strengths

• Data collected by autonomous Seagliders capable of profiling to 1000m depth, providing high-resolution vertical observations.
• Covers two distinct seasonal periods (Fall 2022 and Spring 2023) in a targeted study region.
• Hosted by NASA, indicating institutional credibility and likely adherence to scientific data standards.
• Available in the self-describing, widely-used netCDF format, which supports metadata and multi-dimensional arrays.

Limitations

• Column names and precise variable list are not specified in the provided metadata, limiting immediate understanding of data structure.
• Exact row count, file size, and specific 'other observations' beyond the core four variables are unknown.
• Conflicting 'last updated' dates (2026-04-09 on Data.gov vs. 2023-07-07 on NASA Earthdata) create uncertainty about data currency.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Observations collected by autonomous underwater vehicles (Seagliders) during field campaigns.

Time Range

Fall 2022 to Spring 2023

Freshness

2026-04-09 (most recent update reported, though conflicting with another source)

Geography

Pacific Ocean, approximately 300 km offshore of San Francisco, California, USA