Flash drought early warning based on the trajectory of solar-induced chlorophyll fluorescence.

ABSTRACT: Flash drought often leads to devastating effects in multiple sectors and presents a unique challenge for drought early warning due to its sudden onset and rapid intensification. Existing drought monitoring and early warning systems are based on various hydrometeorological variables reaching thresholds of unusually low water content. Here, we propose a flash drought early warning approach based on spaceborne measurements of solar-induced chlorophyll fluorescence (SIF), a proxy of photosynthesis that captures plant response to multiple environmental stressors. Instead of negative SIF anomalies, we focus on the subseasonal trajectory of SIF and consider slower-than-usual increase or faster-than-usual decrease of SIF as an early warning for flash drought onset. To quantify the deviation of SIF

SUBMITTER: Mohammadi K 

PROVIDER: S-EPMC9371720 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature