A good place for a swim. East Pinnacles Lakes Basin, John Muir Wilderness, Sierra Nevada Mountains, California, USA. Photo by Van Miller
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Mountain lakes are unique ecosystems whose physical, chemical, and biological properties can vary year to year depending on spring snowpack and ice cover. Mount Rainier, Olympic, and North Cascade National Parks contain over 1,200 mountain lakes and ponds at elevations over 3,200 feet (1000 m). Between 2007 and 2018, scientists monitored conditions in mountain lakes in both above average snow years (2011-2012) and in historical minimum snow years (2015). During years with less snow, lakes become ice-free earlier and have warmer summer water temperatures, giving rise to other ecosystem changes linked to temperature such as lower dissolved oxygen, higher total dissolved nitrogen, higher chlorophyll, and higher abundance of cladoceran zooplankton. Conversely, in years with higher snowpack and a shorter ice-free season, lakes were colder and clearer with more dilute ions as well as lower algal biomass and zooplankton abundance. By looking at a variety of snowpack values, scientists are able to address questions about how climate effects mountain lakes and foretell future conditions in Mount Rainier and other Pacific Northwest parks.
Learn more about this research in “Summer ecosystem structure in mountain lakes linked to interannual variability of lake ice, snowpack, and landscape attributes” published in Limnology and Oceanography, available online at https://aslopubs.onlinelibrary.wiley.com/doi/10.1002/lno.12188.
Additional reports about Mount Rainier National Park water quality available at https://go.nps.gov/1tprha.
NPS/M. Schmitt photo of Upper Palisades Lake at Mount Rainier National Park. ~kl
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Also, take this wonderful gift of a really pretty lake
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Great overnight trip into Mountain Lakes for some snow camping this past weekend! More photos from this and the previous weekend's Deschutes River trip as soon as I have time to write something about them!
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Aweetasal Lake, Eastern Pinnacles Lakes Basin. John Muir Wilderness, Sierra Nevada Mountains, California, USA Photo by Van Miller
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My father, when he was about 9. In the High Sierra.
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