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|Created:||Dec 01, 2022 at 4:52 p.m.|
|Last updated:|| Dec 01, 2022 at 5:08 p.m.
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Forest thinning and gap creation are being implemented across the western United States of America (USA) to reduce wildfire and forest mortality risk as the climate warms. The Eastern Cascades in Washington, USA, is in a transitional zone between maritime and continental climate conditions and is a data gap in observations of the relationship between forest density and snowpack. We collected three years of snow observations across a range of forest densities to characterize how forest management efforts in this region may influence the amount and duration of snow storage. Observations indicate that peak snow storage is 0 to 120% greater in small gaps as compared to unburned forest plots in the Eastern Cascades. However, differences in snow duration are generally small, with a median difference, across all Eastern Cascade sites and years, of snow storage lasting 7 days longer in gaps as compared to nearby forest plots, except for one north-facing site where snow lasted 30 days longer in the gap. These observations of similar snow storage duration in the Eastern Cascades are attributed to minimal differences in canopy snow interception processes between forests and gaps at some sites, and to higher ablation rates that counterbalance the higher snow accumulation in the gaps at other sites. At the north-facing site, more snow accumulated in the gap, and melt rates in the open gap were similar to the shaded forest due to the aspect of the site. Thus, snow storage duration was much longer in the gap. Together, these data suggest that prescriptions to reduce forest density through thinning and creating gaps may increase the overall amount of snow storage by reducing loss due to sublimation and melting of canopy-intercepted snow. However, reducing forest density in the Eastern Cascades is also unlikely to buffer the continued shortening of snow storage duration, with the possible exception of gap creation in north-facing forests. Lastly, these observations fill a spatial and climatic data gap and can be used to support hydrological modeling at spatial and temporal scales that are relevant to forest management decisions.
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