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

摘要

We present observations of the evolution of a deep-mixing event in a deep, temperate lake. The observations were obtained from thermistors mounted on along-term mooring in the lade. 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 10~5 J and a volume exchange of 0.7-3.2 km~3 (4-18/100 of the lake volume) between the upper and lower portions of the lake.