Historical Ocean Temperature Profiles from Mechanical Bathythermographs

NODC-processed mechanical bathythermograph (MBT) data captures temperature-depth profiles in the North Pacific Ocean from December 1944 to March 1946. Each observation includes cruise information, date, position, and time, with temperature recorded at uniform 5-meter intervals down to a maximum depth of approximately 285 meters. This dataset is formatted to the NODC standard C128 specification for MBT data.

Use Cases

• Analyzing upper-ocean thermal structure based on standardized 5-meter interval temperature-depth pairs.
• Studying historical sea surface temperature variability using cruise-based time-series data.
• Validating ocean model hindcasts for the North Pacific using precise position and date metadata.

Strengths

• Data is processed to a recognized standard format (NODC C128), ensuring consistency.
• Provides a specific temporal coverage from 1944-12-01 to 1946-03-27 for historical analysis.
• Includes precise metadata for each profile: cruise information, date, position, and time.

Limitations

• Key metadata such as row count, file size, license, and specific column names are unavailable across all sources.
• Instrument limitation: MBT observations are restricted to a maximum depth of ~285 meters, capturing only the upper ocean.
• The most recent update date (2026-03-05) suggests a metadata refresh, but the underlying data is from the 1940s.

Provenance

Source

NOAA National Centers for Environmental Information (NCEI), originating from various small Navy and other vessels.

Collection Method

Data gathered using mechanical bathythermograph (MBT) instruments and processed by NODC.

Time Range

1944-12-01 to 1946-03-27

Freshness

Last metadata update recorded on 2026-03-05, though core data is from 1946.

Geography

North Pacific Ocean