Observations of a Deep-Mixing Event in Crater Lake, Oregon
Crawford GB and Collier RW. 1997. Observations of a Deep-Mixing Event in Crater Lake, Oregon. Limnology and Oceanography. 42(2):299-306
We present observations of the evolution of a deep-mising 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 10^15 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 × 106 mol of nitrate to the upper lake, which accounts for a significant portion of the average annual nitrate flux (~2-4 times 10^6 mol yr^-1)$ thought to be upwelled in this highly oligotrophic system.
- Type
- Journal Article
- Authors
- Crawford, G; Collier, R
- Units
- CRLA
- Keywords
- Aquatic Sciences, Crater Lake Crater Lake National Park OR, Lakes & Ponds, Limnology, Physical Sciences