OCO-2: Daily Bias-Corrected Solar-Induced Fluorescence from Space

NASA's Orbiting Carbon Observatory-2 (OCO-2) mission provides the first space-based measurements of atmospheric carbon dioxide with the precision needed to characterize its buildup. Its SIF Lite files deliver daily, bias-corrected solar-induced chlorophyll fluorescence, a direct indicator of photosynthetic activity, derived from the 0.76 micrometer O2 A-band. This data is a key output from the IMAP-DOAS preprocessor used in the operational OCO-2 pipeline.

Use Cases

• Quantifying global photosynthetic activity based on daily solar-induced fluorescence (SIF) measurements.
• Studying the relationship between atmospheric carbon dioxide levels and terrestrial carbon uptake.
• Validating and improving land surface and carbon cycle models using space-based SIF data.
• Screening data for the official OCO-2 XCO2 product using the IMAP-DOAS preprocessor outputs.

Strengths

• Data is from a dedicated NASA satellite mission (OCO-2) designed for high-precision atmospheric CO2 measurement.
• Provides bias-corrected solar-induced fluorescence, a direct proxy for photosynthesis not available from simple vegetation indices.
• Aggregated as daily files, facilitating time-series analysis of plant activity.

Limitations

• Specific column names and dataset size (row count) are not provided in any source, limiting understanding of data structure.
• Conflicting version information exists between sources (V11r and V11.2r are both listed as current).
• Metadata for license, author, and organization is incomplete or inconsistent across platform entries.

Provenance

Source

NASA Goddard Earth Sciences Data and Information Services Center (GES DISC).

Collection Method

Satellite remote sensing via the OCO-2 spacecraft's three high-resolution spectrometers, processed through the IMAP-DOAS algorithm.

Freshness

Last updated 2026-04-09 according to two platform entries.

Geography

Global coverage from satellite orbits.