Global Ocean Remote-Sensing Reflectance Data from Nimbus-7 CZCS

Remote-sensing reflectance (Rrs) measurements from the Nimbus-7 Coastal Zone Color Scanner (CZCS) satellite, binned globally. The dataset provides the foundational observable for retrieving ocean color products like chlorophyll-a concentration and diffuse attenuation. The data was processed by OB_CLOUD and the final version was released in 2022, with original satellite measurements ending in June 1986.

Use Cases

• Retrieving chlor_a (chlorophyll-a concentration) from Rrs_443 and Rrs_550 band measurements.
• Calculating Kd_490 (diffuse attenuation coefficient at 490nm) using Rrs_490 and other visible bands.
• Developing and validating Inherent Optical Property (IOP) algorithms based on multi-spectral Rrs_λ inputs (e.g., Rrs_412, Rrs_443, Rrs_520).
• Assessing water quality trends in coastal regions by analyzing time-series of Rrs values, filtered using per-file quality flags for land, cloud, and sun glint.
• Supporting ecosystem applications by studying the spectral signature of phytoplankton blooms through Rrs band ratios.

Strengths

• Provides the foundational Rrs observable for multiple derived ocean color products.
• Includes per-file quality flags for land, cloud, sun glint, and high aerosol to aid data filtering.
• Global spatial coverage enables wide-area studies of ocean color.

Limitations

• Data collection ended in 1986, limiting analysis to historical periods before modern sensors.
• Optically complex coastal and inland waters require careful review of mission documentation due to potential retrieval errors.
• Specific row counts, file sizes, and granular temporal coverage are not provided in the input.

Provenance

Source

Nimbus-7 Coastal Zone Color Scanner (CZCS) satellite, processed by OB_CLOUD.

Collection Method

Satellite remote sensing, with data binned to a global Level-3 product.

Time Range

Satellite mission operational from 1978 to June 1986.

Freshness

Final processed version released in 2022, but source satellite measurements are from 1978-1986.

Geography

Global ocean coverage.