Pierrat et al. (2026) OCO‐3 Meets ECOSTRESS: Insights Into Ecosystem Diurnal Water‐Use Efficiency From Co‐Located Solar‐Induced Fluorescence and Thermal Observations

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Identification

• Journal: Geophysical Research Letters
• Year: 2026
• Date: 2026-09-23
• Authors: Zoe Pierrat, Thomas P. Kurosu, Abhishek Chatterjee, Joshua B. Fisher, Margaret C. Johnson, Le Kuai, Kaniska Mallick, Nicholas Cody Parazoo, Benjamin C. Wiebe, Kerry A. Cawse-Nicholson
• DOI: 10.1029/2026gl124105

Research Groups

Not specified in the provided text.

Short Summary

The study evaluates the ability of the newly created ECOCO3 dataset, which harmonizes OCO-3 and ECOSTRESS satellite observations, to reproduce ecosystem water use efficiency (WUE) dynamics observed at FLUXNET sites.

Objective

• To determine whether co-located remote sensing observations from OCO-3 and ECOSTRESS can accurately capture carbon and water flux dynamics (WUE) across various temporal scales, vegetation types, climates, and drought conditions.

Study Configuration

• Spatial Scale: Global/Regional (utilizing satellite observations and FLUXNET site networks).
• Temporal Scale: Sub-daily (diurnal) to seasonal.

Methodology and Data

• Models used: Data harmonization and sampling sensitivity analysis.
• Data sources: NASA's Orbiting Carbon Observatory-3 (OCO-3), ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS), and FLUXNET ground observations.

Main Results

• Developed the ECOCO3 dataset, which harmonizes OCO-3 and ECOSTRESS observations in space and time.
• Demonstrated that ECOCO3 successfully captures broad seasonal and diurnal patterns of carbon and water fluxes, including specific midday drought responses.
• Identified that the primary limitation of the ECOCO3 dataset is the available sample size, which hinders the ability to distinguish between vegetation-driven and climate-driven differences in WUE.

Contributions

• Introduces a harmonized satellite data product (ECOCO3) for studying carbon-water coupling.
• Quantifies the capability and limitations of current remote sensing technology in resolving sub-daily ecosystem regulation of carbon and water fluxes compared to ground-based observations.

Funding

Not specified in the provided text.

Citation

@article{Pierrat2026OCO3,
  author = {Pierrat, Zoe and Kurosu, Thomas P. and Chatterjee, Abhishek and Fisher, Joshua B. and Johnson, Margaret C. and Kuai, Le and Mallick, Kaniska and Parazoo, Nicholas Cody and Wiebe, Benjamin C. and Cawse-Nicholson, Kerry A.},
  title = {OCO‐3 Meets ECOSTRESS: Insights Into Ecosystem Diurnal Water‐Use Efficiency From Co‐Located Solar‐Induced Fluorescence and Thermal Observations},
  journal = {Geophysical Research Letters},
  year = {2026},
  doi = {10.1029/2026gl124105},
  url = {https://doi.org/10.1029/2026gl124105}
}