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Accurate assessment of forest carbon storage and uptake\udis central to policymaking aimed at mitigating climate change and understanding the role forests play in the global carbon cycle. Disturbances have\udhighly diverse impacts on forest carbon dynamics, making them a challenge\udto quantify and report. Time since disturbance is a key intermediate\uddeterminant that aids the assessment of disturbance-driven carbon emissions\udand removals legacies. We propose a new methodology of quantifying time\udsince disturbance and carbon flux across forested landscapes in the Pacific\udNorthwest (PNW) at a fine scale (30 m) by combining remote sensing (RS)-based disturbance year, disturbance type, and above-ground biomass with\udforest inventory data. When a recent disturbance is detected, time since\uddisturbance can be directly determined by combining three RS-derived\uddisturbance products, or time since the last stand clearing can be\udinferred from a RS-derived 30 m biomass map and field inventory-derived\udspecies-specific biomass accumulation curves. Net ecosystem productivity\ud(NEP) is further mapped based on carbon stock and flux trajectories derived\udfrom the Carnegie-Ames-Stanford Approach (CASA) model in our prior work that\uddescribed how NEP changes with time following harvest, fire, or bark beetle\uddisturbances of varying severity. Uncertainties from biomass map and forest\udinventory data were propagated by probabilistic sampling to provide a\udstatistical distribution of stand age and NEP for each forest pixel. We mapped\udmean, standard deviation, and statistical distribution of stand age and NEP at\ud30 m in the PNW region. Our map indicated a net ecosystem productivity of\ud5.9 Tg C yr−1 for forestlands circa 2010 in the study area, with net\uduptake in relatively mature (> 24 years old) forests (13.6 Tg C yr−1) overwhelming net negative NEP from tracts that had recent\udharvests\ud(−6.4 Tg C yr−1), fires (−0.5 Tg C yr−1), and bark beetle outbreaks\ud(−0.8 Tg C yr−1). The approach will be applied to forestlands in other\udregions of the conterminous US to advance a more comprehensive monitoring,\udmapping, and reporting of the carbon consequences of forest change across the\udUS

biogeosciences

High-resolution mapping of time since disturbance and forest carbon flux from remote sensing and inventory data to assess harvest, fire, and beetle disturbance legacies in the Pacific Northwest