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Titolo:
THE SIGNIFICANCE OF STORMS FOR THE CONCENTRATION AND EXPORT OF DISSOLVED ORGANIC-CARBON FROM 2 PRECAMBRIAN SHIELD CATCHMENTS
Autore:
HINTON MJ; SCHIFF SL; ENGLISH MC;
Indirizzi:
UNIV WATERLOO,WATERLOO CTR GROUNDWATER RES WATERLOO ON N2L 3G1 CANADA WILFRID LAURIER UNIV,DEPT GEOG WATERLOO ON N2L 3C5 CANADA
Titolo Testata:
Biogeochemistry
fascicolo: 1, volume: 36, anno: 1997,
pagine: 67 - 88
SICI:
0168-2563(1997)36:1<67:TSOSFT>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
SURFACE WATERS; STREAM; SOIL; MECHANISMS; DYNAMICS; ACIDS;
Keywords:
CLIMATE CHANGE; DISSOLVED ORGANIC CARBON (DOG); FORESTED CATCHMENTS; NUTRIENT EXPORT; PRECAMBRIAN SHIELD STREAMS; STORM RUNOFF;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
M.J. Hinton et al., "THE SIGNIFICANCE OF STORMS FOR THE CONCENTRATION AND EXPORT OF DISSOLVED ORGANIC-CARBON FROM 2 PRECAMBRIAN SHIELD CATCHMENTS", Biogeochemistry, 36(1), 1997, pp. 67-88

Abstract

Dissolved organic carbon (DOG) concentrations and DOC export are studied during storms to examine the relationship between DOC concentration and stream discharge and to assess the importance of storms on DOC export. Storms were monitored in seven subcatchments within two small watersheds (Harp 4-21 and Harp 3A) on the Precambrian Shield in CentralOntario, Canada. Stream DOC concentrations increase during storms by as much as 100% and 410% in Harp 3A and Harp 4-21 respectively. The seasonal regression between DOC and stream discharge is significant in subcatchments without wetlands (r(2) > 0.7) but is not significant in the two subcatchments with small wetland areas (r(2) < 0.06). On average, regressions based on weekly data yield accurate estimates of DOC export but the variation in regressions among individual storms and the small number of high DOC samples result in uncertainties of more than 30% in DOC export. The period-weighted calculation of DOC export from weekly data underestimates export by 14% and 22% in Harp 3A and Harp 4-21 respectively. Storms were responsible for 57% to 68% of the DOC export in the autumn and 29% to 40% of the DOC export in the spring. A single large storm accounted for 31% of the autumn DOC export in Harp 3A. The importance of individual storms for DOC export and the variation in the relationship between DOC and stream discharge among storms make it difficult to predict the effects of climate change on DOC exportand DOC concentrations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 07:33:55