Improved Vegetation Photosynthetic Phenology Monitoring in the Northern Ecosystems Using Total Canopy Solar‐Induced Chlorophyll Fluorescence Derived From TROPOMI

• DOI: 10.1029/2022jg007369
• Publication Date: 2023-06-13T18:30:20Z
• Authors: Haoran Liu; Junzhi Liu; Yueqiang Yin; Sophia Walther; Xuanlong Ma; Zhaoying Zhang; Yuhan Chen
• Keywords: 13. Climate action; 15. Life on land; 01 natural sciences; 0105 earth and related environmental sciences

Abstract Solar‐Induced chlorophyll Fluorescence (SIF) from the TROPOspheric Monitoring Instrument (TROPOMI) with substantially improved spatiotemporal resolutions provides a new potential to improve satellite‐based phenology monitoring. The performance of TROPOMI SIF for tracking vegetation photosynthetic phenology, and how it compares conventional indices (VIs)‐based approaches, however, have not been adequately assessed. Total canopy SIF, as better proxy Gross Primary Productivity (GPP) than original directional is estimate while its has investigated. This study assesses capability before after correction monitoring improves our understanding these questions. Benchmarked by tower‐based GPP, generally performed VIs, especially capturing End Of Season (EOS) activity at deciduous broadleaf forest (DBF), evergreen (ENF), croplands (CRO) sites, but Start (SOS). suggested that advantage over VIs depended on phenological metrics. total emission obtained through retrievals, in estimating EOS sites (DBF, MF, ENF), soil did further accuracy When comparing SIF‐ VI‐based metrics northern terrestrial ecosystems, showed earlier senescence date widely, differences onset were region dependent. These results indicate necessity convert when using satellite products