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Rainfall drives rap...
Rainfall drives rapid shifts in carbon and nutrient source-sink dynamics of an urbanised, mangrove-fringed estuary
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Reithmaier, Gloria M.S. (author)
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Chen, Xiaogang (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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Drexl, Michael J. (author)
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- Holloway, Ceylena (author)
- Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
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Call, Mitchell (author)
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Álvarez, Paula Gómez (author)
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Euler, Sebastian (author)
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Maher, Damien T. (author)
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(creator_code:org_t)
- Elsevier BV, 2021
- 2021
- English.
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In: Estuarine, Coastal and Shelf Science. - : Elsevier BV. - 0272-7714. ; 249
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https://doi.org/10.1...
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Abstract
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- © 2020 Elsevier Ltd Estuaries provide valuable ecosystem services, such as carbon storage and nutrient retention, which may be affected by episodic rainfall events. This study aimed to investigate the short-term effect of episodic rainfall on alkalinity, dissolved carbon and nutrient biogeochemistry in a small, urbanised and mangrove-fringed estuary. High temporal resolution sampling (1.5-h interval) at upper and lower estuary sites, as well as groundwater sampling, were conducted over two weeks to assess estuarine source/sink dynamics of total alkalinity (TAlk), organic alkalinity (OAlk), dissolved inorganic carbon (DIC), dissolved organic carbon (DOC), nitrate, nitrite, ammonium and phosphate. Rapid, short-term changes in estuarine biogeochemistry and mixing were triggered by two episodic rainfall events, which delivered 26 mm over 2 h and 39 mm over 21 h. The estuary was a source for TAlk and DIC exporting 2.2 ± 1.9 and 2.2 ± 1.5 mmol/m2 catchment/d, respectively, to the coastal ocean during the observation period. On average, OAlk accounted for 8% of TAlk at the upstream and 3% at the downstream site. Unlike pristine mangrove systems, the estuary was a net sink for DOC, equivalent to ~23% of the DIC source. Rainfall increased catchment nutrient inputs into the estuary, which was a source for ammonium, but a sink for nitrate and nitrite (NOx) throughout the study period. In contrast, phosphate dynamics were less clear. Estuarine biogeochemical transformations affected the exchange with the coastal ocean, driving net TAlk export and by acting as a sink for catchment-derived nutrients. Our high-temporal resolution results suggest that rainfall events rapidly modify estuarine biogeochemistry and mixing, altering the net fluxes of TAlk, dissolved carbon and nutrients to the coastal ocean.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
Keyword
- Autosampler
- Blue carbon
- Coastal carbon cycle
- Estuarine filter
- Nutrient attenuation
- Subtropical
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Reithmaier, Glor ...
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Chen, Xiaogang
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Santos, Isaac R.
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Drexl, Michael J ...
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Holloway, Ceylen ...
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Call, Mitchell
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show more...
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Álvarez, Paula G ...
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Euler, Sebastian
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Maher, Damien T.
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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 ...
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and Climate Research
- Articles in the publication
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Estuarine, Coast ...
- By the university
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University of Gothenburg