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Dual isotope measurements reveal zoning of nitrate processing in the summer Changjiang (Yangtze) River plume
Citation
Yan, X and Xu, MN and Wan, XS and Yang, JYT and Trull, TW and Dai, M and Kao, SJ, Dual isotope measurements reveal zoning of nitrate processing in the summer Changjiang (Yangtze) River plume, Geophysical Research Letters, 44, (24) pp. 12,289-12,297. ISSN 0094-8276 (2017) [Refereed Article]
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Copyright Statement
Copyright 2017 American Geophysical Union
Abstract
Riverine nitrogen input into the coastal zone has increased remarkably in recent decades. Yet its transformation and recycling within hydrodynamically active regions remains unclear. Using observations of nitrate concentration and dual isotopic composition across the Changjiang River plume within a three end-member mixing model, we found deviations between the observed and expected values for mixing alone, revealing the nonconservative behavior of nitrate. Using cross correlations between concentrations and dual isotope deviations, we identified three nitrogen transformation zones, which correspond to separate portions of the plume. Nitrification and sedimentary denitrification occurred near the river mouth, nitrification prevailed further offshore under the plume, and finally, phytoplankton assimilation occurred in the outer surface plume (>100 km offshore), where it was fueled by nitrate that had already been strongly modified by microbial processes. Information was assembled into a conceptual model offering an overview of nitrogen transformations in a large river plume.
Item Details
Item Type: | Refereed Article |
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Keywords: | Changjiang River, plume, dual isotope, nitrate, isotope effect |
Research Division: | Earth Sciences |
Research Group: | Oceanography |
Research Field: | Chemical oceanography |
Objective Division: | Environmental Management |
Objective Group: | Marine systems and management |
Objective Field: | Measurement and assessment of marine water quality and condition |
UTAS Author: | Trull, TW (Professor Thomas Trull) |
ID Code: | 125812 |
Year Published: | 2017 |
Web of Science® Times Cited: | 21 |
Deposited By: | Ecology and Biodiversity |
Deposited On: | 2018-05-08 |
Last Modified: | 2018-08-20 |
Downloads: | 74 View Download Statistics |
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