Zhou et al. (2026) Global solar-induced chlorophyll fluorescence reconstruction crossing three platforms

Identification

• Journal: Agricultural and Forest Meteorology
• Year: 2026
• Date: 2026-05-07
• Authors: Yang Zhou, Kai Zhou, Jiawei Zhang, Quan Zhang
• DOI: 10.1016/j.agrformet.2026.111217

Research Groups

• State Key Laboratory of Water Resources Engineering and Management, Wuhan University, China
• Bureau of Hydrology, Changjiang Water Resources Commission, China

Short Summary

The study develops a harmonized global daily solar-induced chlorophyll fluorescence (SIF) product (HSIF) for the period 2003–2023 by integrating data from three satellite platforms using CDF matching and machine learning.

Objective

• To address inconsistencies in retrieval methods, instrumental characteristics, and spatiotemporal gaps inherent in single-platform SIF data to create a continuous, high-resolution global SIF reconstruction.

Study Configuration

• Spatial Scale: Global, with a spatial resolution of $0.05^\circ$.
• Temporal Scale: Daily resolution spanning from 2003 to 2023.

Methodology and Data

• Models used: Cumulative Distribution Function (CDF) matching and machine learning algorithms.
• Data sources: Satellite retrievals from SCIAMACHY, GOME-2, and OCO-2; validation data from 10 tower-measured SIF sites.

Main Results

• The global mean SIF was $0.18\text{ mW m}^{-2}\text{ nm}^{-1}\text{ sr}^{-1}$.
• A significant increasing trend of $5.7 \times 10^{-4}\text{ mW m}^{-2}\text{ nm}^{-1}\text{ sr}^{-1}\text{ yr}^{-1}$ was observed, representing a cumulative increase of 7% over the study period.
• The HSIF product demonstrated robust performance in reproducing the GPP-SIF relationship and showed consistent spatiotemporal patterns when compared with four other reconstructed SIF products.

Contributions

• Provides a harmonized, long-term (20-year) global daily SIF dataset that overcomes the limitations of individual satellite platforms (such as viewing-illumination geometries and overpass times), offering a valuable resource for studying global photosynthetic activity and carbon fluxes.

Funding

• Not specified in the provided text.

Citation

@article{Zhou2026Global,
  author = {Zhou, Yang and Zhou, Kai and Zhang, Jiawei and Zhang, Quan},
  title = {Global solar-induced chlorophyll fluorescence reconstruction crossing three platforms},
  journal = {Agricultural and Forest Meteorology},
  year = {2026},
  doi = {10.1016/j.agrformet.2026.111217},
  url = {https://doi.org/10.1016/j.agrformet.2026.111217}
}