Details

Autor(en) / Beteiligte

• Connolly, C T
• Khosh, M S
• Burkart, G A
• Douglas, T A
• Holmes, R M
• Jacobson, A D
• Tank, S E
• McClelland, J W

Titel

Watershed slope as a predictor of fluvial dissolved organic matter and nitrate concentrations across geographical space and catchment size in the Arctic

Ist Teil von

• Environmental research letters, 2018-10, Vol.13 (10), p.104015

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2018

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• Understanding linkages between river chemistry and biological production in arctic coastal waters requires improved estimates of riverine nutrient export. Here we present the results of a synthesis effort focusing on relationships between watershed slope and seasonal concentrations of river-borne dissolved organic carbon (DOC), dissolved organic nitrogen (DON), and nitrate ( NO 3 − ) around the pan-Arctic. Strong negative relationships exist between watershed slope and concentrations of DOC and DON in arctic rivers. Spring and summer concentration-slope relationships for DOC and DON are qualitatively similar, although spring concentrations are higher. Relationships for NO 3 − are more variable, but a significant positive relationship exists between summer NO 3 − concentrations and watershed slopes. These results suggest that watershed slope can serve as a master variable for estimating spring and summer DOC and DON concentrations, and to a lesser degree NO 3 − , from drainage areas where field data are lacking, thus improving our ability to develop pan-arctic estimates of watershed nutrient export.