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Spatial and spectral characterization of acid rain stress in Canadian Shield lakesResults from this study demonstrate that a remote sensor can discriminate lake clarity based upon reflection. The basic hypothesis was that seasonal and multiyear changes in lake optical transparency are indicative of sensitivity to acidic deposition. In many acid-sensitive lakes optical transparency is controlled by the amount of dissolved organic carbon (DOC) present. DOC is a strong absorbing, nonscattering material which has the greatest impact at short visible wavelengths, including Thematic Mapper band 1. Acid-sensitive lakes have high concentrations of aluminum which have been mobilized by acidic components contained in the runoff. Aluminum complexing with DOC is considered to be the primary mechanism to account for observed increases in lake transparency in acid-sensitive lakes. Thus seasonal changes in the optical transparency of lakes should provide an indication of the stress due to acid deposition and loading.
Document ID
19910031358
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Marshall, Elizabeth J.
(Environmental Research Inst. of Michigan Ann Arbor, MI, United States)
Tanis, Frederick J.
(Michigan Environmental Research Institute, Ann Arbor, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1989
Subject Category
Earth Resources And Remote Sensing
Accession Number
91A15981
Funding Number(s)
CONTRACT_GRANT: NAS5-28779
Distribution Limits
Public
Copyright
Other

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