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Nitrous oxide hot m...
Nitrous oxide hot moments and cold spots in a subtropical estuary: Floods and mangroves
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Woodrow, R. L. (author)
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White, S. A. (author)
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Sanders, C. J. (author)
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Holloway, C. J. (author)
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Wadnerkar, P. D. (author)
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Conrad, S. R. (author)
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Tucker, J. P. (author)
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Davis, K. L. (author)
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- Santos, Isaac R. (author)
- Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
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(creator_code:org_t)
- Elsevier BV, 2022
- 2022
- English.
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In: Estuarine, Coastal and Shelf Science. - : Elsevier BV. - 0272-7714. ; 264
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https://doi.org/10.1...
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Abstract
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- Flood events can transport large nitrogen loads to the ocean in short periods with the potential to produce significant nitrous oxide (N2O) emissions along an estuarine gradient. Here, we evaluate temporal and spatial N2O air-water fluxes from both seasonal, and flood-event timescales in an urban subtropical estuary surrounded by mangroves (Coffs Creek, Australia). Overall, the estuary was a minor atmospheric source of N2O with emissions of 3.9 ± 1.2 μmol m−2 d−1. However, the mangrove-dominated lower estuary was a sink of N2O in the dry months (−5.4 ± 2.2 μmol m−2 d−1), then a source in the wet months (11.7 ± 1.6 μmol m−2 d−1) and also during an eight-day flood event (66.9 ± 9.8 μmol m−2 d−1). The flood event drove changes in estuary N2O dynamics, creating a ‘hot moment’ with the highest N2O emissions following the transport of nitrate + nitrite (NOX) from the modified catchment. The hot moment coincided with a 13-fold increase in mean daily N2O emissions and increased annual net emissions estimates to the atmosphere by 41%. In the mangrove-dominated creek sections, N2O was consumed in the dry conditions (cold spots). Seasonal variation was prominent in the attenuation and consumption of N2O in the mangrove dominated sections of the creek, while flood events potentially reduce natural creek NOX attenuation capacity and elevate N2O emissions. Without observation s in both seasonal and episodic rainfall timeframes, estuarine N2O studies in subtropical regions may underestimate N2O emissions and budgets. © 2021 Elsevier Ltd
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- 153.10 °E
- 30.30 °S
- Australia
- Coffs Harbour
- Greenhouse gases
- Hydrology
- NSW
- Porewater exchange
- Regional index terms
- Wetlands
- estuarine environment
- estuarine sediment
- estuary
- flood
- hydrodynamics
- mangrove
- nitrous oxide
- seasonal variation
- subtropical region
- Coffee Bay
- Eastern Cape
- South Africa
- Rhizophoraceae
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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Woodrow, R. L.
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White, S. A.
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Sanders, C. J.
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Holloway, C. J.
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Wadnerkar, P. D.
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Conrad, S. R.
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show more...
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Tucker, J. P.
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Davis, K. L.
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Santos, Isaac R.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
- Articles in the publication
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Estuarine, Coast ...
- By the university
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University of Gothenburg