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| Titel |
Long-term patterns in dissolved organic carbon in boreal lakes: the role of incident radiation, precipitation, air temperature, southern oscillation and acid deposition |
| VerfasserIn |
J. J. Hudson, P. J. Dillon, K. M. Somers |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 7, no. 3 ; Nr. 7, no. 3, S.390-398 |
| Datensatznummer |
250004638
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| Publikation (Nr.) |
 copernicus.org/hess-7-390-2003.pdf |
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| Zusammenfassung |
| Both lake-specific (e.g. pH) and regional (e.g. precipitation) factors affect
DOC concentration and pattern. Using annual DOC concentration in nine boreal lakes in the
ice-free season, the potential influences of five regional factors, air temperature,
precipitation, SO4 deposition, solar radiation (photosynthetically active
radiation, or PAR) and the southern oscillation index (SOI) have been explored through
multiple regression. Mean solar radiation, winter precipitation and summer precipitation
explained 59% of the variation in the mean DOC concentration
(F3,17= 8.29, p= 0.0013). Solar radiation and winter precipitation
were correlated, negatively, while summer precipitation was correlated, positively, with
DOC concentration. Because these relationships were based on only 21 years of data (1978
to 1998), the significance of the parameters in the regression model was evaluated with
a randomisation test. This re-analysis indicated that summer precipitation did not
contribute significantly to the regression model ( prand= 0.183).
The final multiple regression explained 50% of the variation in DOC
(F2,18 = 9.33, prand= 0.002) based on solar radiation
and winter precipitation. These results suggest that solar radiation and winter
precipitation have a significant role in determining long-term DOC concentration in boreal
lakes.
Keywords: dissolved-organic-carbon, lakes, climate, solar-radiation, precipitation,
acid-precipitation, Precambrian-Shield-Ontario |
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