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Changes in Growing Season Phenology Following Wildfires in Alaska

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Abstract

Trends and geographic patterns of change in vegetation phenology metrics and snowmelt timing from the MODerate resolution Imaging Spectroradiometer (MODIS) satellite data sets were analyzed across the state of Alaska for all wildfires that burned during the years 2004 and 2005. Phenology metric patterns (over the period 2000 to 2018) derived from the normalized difference vegetation index (NDVI) time-series at 250-m resolution tracked changes in the growing season length and integrated greenness cover over the past two decades. NDVI metrics showed that end of the growing season timing (EOST) and integrated greenness increased significantly in the majority of severely burned areas in Interior Alaska over the past decade particularly in low elevation zones below 500 m. In years with relatively early snowmelt dates (3 to 10 days earlier than the long-term mean), lower plant growth was observed over the ensuing growing season, potentially due to lower snow water inputs that can maintain available soil moisture levels for plant growth into the mid- and late-summer months. Statewide trends in MODIS phenology metrics indicate that the predominant vegetation cover type in most regrowing burned areas of Interior Alaska a decade post-fire is still deciduous shrub and young tree cover. Several large fires of special interest were identified to monitor with remote sensing and continue to track long-term recovery patterns and rates.

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Acknowledgments

This work was supported by NASA Ames Research Center, as a contribution to NASA ABoVE (Arctic Boreal Vulnerability Experiment) project.

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  1. NASA Ames Research Center, Moffett Field, CA, 94035, USA

    Christopher Potter

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  1. Christopher Potter
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Correspondence to Christopher Potter.

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Potter, C. Changes in Growing Season Phenology Following Wildfires in Alaska. Remote Sens Earth Syst Sci 3, 95–109 (2020). https://doi.org/10.1007/s41976-020-00038-7

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