New satellite dataset sheds light on Earth’s plant growth

Gross Primary Production (GPP), the process through which plants convert carbon dioxide and sunlight into glucose and oxygen, is the Earth’s largest carbon flux. Accurate quantification of GPP is crucial for understanding carbon budgets and their implications on climate change and land management policies. However, traditional methods for estimating global GPP are challenged by the complexity of integrating biophysical and biochemical processes at various scales. This challenge has led to the development of the Comprehensive Mechanistic Light Response (CMLR) GPP dataset, and the details are in the article (DOI: 10.34133/remotesensing.0127) published in the Journal of Remote Sensing on 13 Feb 2024.

This dataset, for the first time, harnesses solar-induced chlorophyll fluorescence (SIF), a direct signal emitted by plants during photosynthesis, offering a more accurate and direct measurement of plant productivity on a global scale. The researchers employed a sophisticated light response model adjusted for the canopy scale to transform TROPOMI’s SIF observations into a global GPP dataset. This method represents a substantial leap from previous models by integrating direct physiological signals from plants, thus reducing uncertainties and enhancing the dataset’s reliability across diverse environmental conditions and vegetation types. Through rigorous validation against tower-based GPP measurements, the CMLR GPP dataset demonstrated strong correlation and consistency, proving its efficacy in accurately capturing the spatial and temporal patterns of global photosynthesis.

Liangyun Liu, a senior researcher involved in the study, emphasized the significance of this advancement: “The CMLR GPP dataset not only enhances our understanding of global photosynthesis but also serves as a crucial tool for monitoring the Earth’s carbon cycle. This dataset is a testament to the power of combining satellite technology with ecological research to address pressing environmental challenges.”

The creation of the CMLR GPP dataset marks a pivotal moment in environmental research, offering unprecedented insights into the Earth’s carbon cycle, informing climate change models, and aiding policy decisions on land management and climate mitigation.

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References

DOI

10.34133/remotesensing.0127

Original Source URL

https://doi.org/10.34133/remotesensing.0127

Funding information

This research was supported by the National Natural Science Foundation of China (grant numbers 41825002 and 42071310). This work has been supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy – EXC 2070 – 390732324.

About Journal of Remote Sensing

The Journal of Remote Sensing, an online-only Open Access journal published in association with AIR-CAS, promotes the theory, science, and technology of remote sensing, as well as interdisciplinary research within earth and information science.