Gas exchange rates in small Canadian Shield lakes1
A method for determining the transfer rate of gases between water and the atmosphere in the ocean, using the isotope pair 220Ra and 222Rn, is extended to small lakes in northwestern Ontario. Three independent experiments from 1971 through 1972 have established the gas exchange velocity in these lake...
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| Published in: | Limnology and oceanography Vol. 20; no. 5; pp. 754 - 761 |
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| Main Author: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
01-09-1975
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| Online Access: | Get full text |
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| Summary: | A method for determining the transfer rate of gases between water and the atmosphere in the ocean, using the isotope pair 220Ra and 222Rn, is extended to small lakes in northwestern Ontario. Three independent experiments from 1971 through 1972 have established the gas exchange velocity in these lakes to be 0.2 ± 0.1 m day−1 (corresponding to a “boundary layer” of about 600 µ). This rate is one of the lowest observed in natural waters to date— less than a tenth of oceanic values and several times less than in the U.S. Great Basin lakes. A compilation of diverse gas exchange results, where wind velocity has also been measured, indicates that the results of laboratory experiments comparing wind velocity with gas transfer conform fairly well with the natural situation. |
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| ISSN: | 0024-3590 1939-5590 |
| DOI: | 10.4319/lo.1975.20.5.0754 |