Site-Level Coupled Assimilation of FLUXNET and Earth Observation (EO) Data

This study will focus on the joint assimilation of multiple Earth Observation (EO) data streams – FAPAR, SIF, L-VOD, ASCAT slope, and SM – with eddy-covariance flux measurements of NEE and GPP at various FLUXNET sites in a developed data assimilation framework with TCCAS land surface model. The framework will be used to address the following questions. First, the consistency of assimilation results across sites and data streams will be tested to assess if the addition of EO variables is leading to significant improvements in the NEE/GPP estimates, and to measure how much posterior parameters are converging towards physically consistent values and their spread. The combination of diverse EO and flux will explain how multi-stream model-data can better constrain ecosystem fluxes and parameters, thus improving the terrestrial biosphere models used for the evaluation of the resilience of the land carbon sink under climate change.