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Measurements of spectral optical properties and their relation to biogeochemical variables and processes in Crater Lake, Crater Lake National Park, OR

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Long-term Limnological Research and Monitoring at Crater Lake, Oregon

Part of the book series: Developments in Hydrobiology ((DIHY,volume 191))

Abstract

Spectral inherent optical properties (IOPs) have been measured at Crater Lake, OR, an extremely clear sub-alpine lake. Indeed Pure water IOPs are major contributors to the total IOPs, and thus to the color of the lake. Variations in the spatial distribution of IOPs were observed in June and September 2001, and reflect biogeochemical processes in the lake. Absorption by colored dissolved organic material increases with depth and between June and September in the upper 300 m. This pattern is consistent with a net release of dissolved organic materials from primary and secondary production through the summer and its photo-oxidation near the surface. Waters fed by a tributary near the lake’s rim exhibited low levels of absorption by dissolved organic materials. Scattering is mostly dominated by organic particulate material, though inorganic material is found to enter the lake from the rim following a rain storm. Several similarities to oceanic oligotrophic regions are observed: (a) The Beam attenuation correlates well with particulate organic material (POM) and the relationship is similar to that observed in the open ocean. (b) The specific absorption of colored dissolved organic material has a value similar to that of open ocean humic material. (c) The distribution of chlorophyll with depth does not follow the distribution of particulate organic material due to photo-acclimation resulting in a subsurface pigment maximum located about 50 m below the POM maximum.

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Author information

Authors and Affiliations

  1. University of Maine, 5741 Libby Hall, Orono, ME, 04469, USA

    Emmanuel S. Boss

  2. COAS, Oregon State University, 104 Ocean. Admin. Bldg., Corvallis, OR, 97331, USA

    Robert Collier & W. S. Pegau

  3. USGS Forest and Rangeland Ecosystem Science Center, 3200 Jefferson Way, Corvallis, OR, 97331, USA

    Gary Larson

  4. IMCS, Rutgers University, 71 Dudley Road, New Brunswick, NJ, 08901, USA

    Katja Fennel

Authors
  1. Emmanuel S. Boss
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  2. Robert Collier
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  3. W. S. Pegau
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  4. Gary Larson
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  5. Katja Fennel
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Corresponding author

Correspondence to Emmanuel S. Boss .

Editor information

Editors and Affiliations

  1. USGS Forest and Rangeland Ecosystem Science Center, 3200 SW Jefferson Way, Corvallis, OR, 97331, USA

    G. L. Larson

  2. College of Oceanic and Atmospheric Sciences, Oregon State University, Ocean Admin Bldg 104, Corvallis, Ore, 97331, USA

    R. Collier

  3. U. S. National Park Service, Crater Lake National Park, PO Box 7, Crater Lake, OR, 97604, USA

    M. W. Buktenica

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Boss, E.S., Collier, R., Pegau, W.S., Larson, G., Fennel, K. (2007). Measurements of spectral optical properties and their relation to biogeochemical variables and processes in Crater Lake, Crater Lake National Park, OR. In: Larson, G.L., Collier, R., Buktenica, M.W. (eds) Long-term Limnological Research and Monitoring at Crater Lake, Oregon. Developments in Hydrobiology, vol 191. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5824-0_9

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