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Observations of a deep-mixing event in Crater Lake, Oregon

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https://ir.library.oregonstate.edu/concern/articles/k643b277k

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Abstract
  • We present observations of the evolution of a deep-mixing event in a deep, temperate lake. The observations were obtained from thermistors mounted on a long-term mooring in the lake. The event seems to have originated near 150-m depth and resulted in a plume or layer of cold water from the upper half of the lake that descended to the lake bottom (590 m) over a 3-d period. Net mixing associated with this event resulted in an overall vertical heat exchange of nearly lO 15 J and a volume exchange of 0.7–3.2 km 3 (4–18% of the lake volume) between the upper and lower portions of the lake. The deep water displaced during the event is estimated to have carried 0.3–2.5 X l0 6 mol of nitrate to the upper lake, which accounts for a significant portion of the average annual nitrate flux (-2-4 X 10 6 mol yr-1) thought to be upwelled in this highly oligotrophic system.
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Citation
  • Crawford, G. B., Collier, R. W., ( 1997), Observations of a deep‐mixing event in Crater Lake, Oregon, Limnology and Oceanography, 42, doi: 10.4319/lo.1997.42.2.0299.
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  • 42
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  • 2
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  • Background; Methods; Results; Discussion
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  • This research was supported by the National Science Foundation (EAR 92-19953), the U.S. National Park Service Global Change Research Program, and the College of Oceanic and Atmospheric Sciences, Oregon State University.
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  • 0024-3590

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