Academic Journal
Modeling the role of riverine organic matter in hypoxia formation within the coastal transition zone off the Pearl River Estuary
| العنوان: | Modeling the role of riverine organic matter in hypoxia formation within the coastal transition zone off the Pearl River Estuary |
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| المؤلفون: | Yu, Liuqian, Gan, Jianping, Dai, Minhan, Hui, Chiwing Rex, Lu, Zhongming, Li, Dou |
| المصدر: | Limnology and Oceanography ; volume 66, issue 2, page 452-468 ; ISSN 0024-3590 1939-5590 |
| بيانات النشر: | Wiley |
| سنة النشر: | 2020 |
| المجموعة: | Wiley Online Library (Open Access Articles via Crossref) |
| الوصف: | Globally expanding hypoxia in estuaries and coastal oceans has largely been attributed to the elevated river nutrient inputs, whereas the role of river‐delivered terrestrial organic matter (OM terr ) in hypoxia formation has been less investigated. This study uses a coupled physical‐biogeochemical model and observations to investigate how OM terr directly (via remineralization) and indirectly (via the nutrients released from OM terr remineralization) promotes hypoxia development in the coastal transition zone off the Pearl River Estuary. Results show that direct contribution of OM terr remineralization to total oxygen consumption by terrestrial and marine organic matter negatively correlates with salinity, decreasing from over 60% in the upper estuary to nearly 0% in the far reaches of the river plume, and is higher in the upstream (average 30%) than the downstream region (average 18%). Nevertheless, the nutrients released from OM terr remineralization greatly sustain an indirect contribution to oxygen depletion and hypoxia formation downstream. The increasing relative importance of indirect over the direct effect of OM terr to hypoxia along the plume path is a combined result of the wind‐driven eastward shelf current and the OM terr ‐released nutrients being advected farther downstream than the sinking OM terr . This highlights that without including the indirect effect of OM terr may underestimate the role of OM terr in hypoxia formation in aquatic systems. Examinations of the hypoxia response to varying riverine loads further suggest that reducing the nutrient and OM terr loads is required for hypoxia mitigation in the upstream region while reducing the nutrient load alone is more effective in mitigating hypoxia in the downstream. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1002/lno.11616 |
| الاتاحة: | http://dx.doi.org/10.1002/lno.11616 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11616 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11616 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11616 |
| Rights: | http://onlinelibrary.wiley.com/termsAndConditions#vor |
| رقم الانضمام: | edsbas.A1FE300D |
| قاعدة البيانات: | BASE |
| DOI: | 10.1002/lno.11616 |
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