Watershed slope as a predictor of fluvial dissolved organic matter and nitrate concentrations across geographical space and catchment size in the Arctic
Watershed slope as a predictor of fluvial dissolved organic matter and nitrate concentrations across geographical space and catchment size in the Arctic
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DOI：
10.1088/1748-9326/aae35d
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发表时间：
2018-10
影响因子：
6.7
通讯作者：
C. Connolly;M. Khosh;G. Burkart;T. Douglas;R. Holmes;A. Jacobson;S. Tank;J. McClelland
中科院分区：
文献类型：
--
作者：
C. Connolly;M. Khosh;G. Burkart;T. Douglas;R. Holmes;A. Jacobson;S. Tank;J. McClelland
了解河流化学和北极沿海沃茨生物生产之间的联系，需要改进河流营养输出的估计。在这里，我们提出了一个综合的努力，专注于流域坡度和季节性浓度的河流溶解有机碳（DOC），溶解有机氮（DON），硝酸盐（NO 3-）之间的关系的结果在泛北极。在北极河流中，流域坡度与DOC和DON浓度之间存在较强的负相关关系。春季和夏季DOC和DON的浓度-斜率关系是定性相似的，虽然春季浓度较高。NO 3 −的关系更多变，但夏季NO 3 −浓度和流域坡度之间存在显着的正相关关系。这些结果表明，流域坡度可以作为一个主变量，估计春季和夏季DOC和DON浓度，并在较小程度上NO 3-，从流域的实地数据是缺乏的，从而提高我们的能力，发展泛北极的流域养分输出的估计。
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.