Satellite and eddy covariance analysis reveals short-lived evapotranspiration changes after fire in Mediterranean woodland

作者：H. Nguyen, Simone Gelsinari, Nik Callow, Richard Silberstein, Sally Thompson · 发表于：Journal of Hydrology · 年份：2025 · DOI：10.1016/j.jhydrol.2024.132654 · 被引用次数：5 · 研究领域：Plant Water Relations and Carbon Dynamics、Fire effects on ecosystems、Tree-ring climate responses

Ecosystem evapotranspiration (ET) varies through space and time in response to environmental gradients and disturbances like fire. Field-based techniques (e.g. eddy covariance) can directly measure how ET responds to fire; however, these measurements are localised and only represent small areas. Remotely sensed ET products can potentially evaluate fire impacts on ecosystem ET, but their performance for this task remains largely unassessed. This paper uses three widely available remote sensing products: the CSIRO MODIS ReScaled ET (CMRSET), MODIS ET (MOD16), and Penman-Monteith-Leuning (PML), to assess ET changes caused by a fuel reduction burn in a Mediterranean woodland in comparison to the changes detected using eddy covariance measurements. All remotely sensed ET products were first compared to ET measured at the Gingin OzFlux eddy covariance tower at annual and monthly timescales. Then, we tested the ability of these products to identify fire-induced changes by comparing ET between burned and unburned areas. At the annual timescale, CMRSET, MOD16, and PML agreed well with eddy covariance with R 2 ranging from 0.44 to 0.56 and R M S E equaling 3.0 to 4.0% of the annual eddy covariance estimate. However, the agreement was worse at the monthly timescale with R 2 ranging from 0.14 to 0.54 and R M S E equaling 10.0 to 18.0% of the monthly eddy covariance estimate. In addition, CMRSET exhibited a two-month phase lag with measured ET. Eddy covariance suggested that the fuel redu...