Sediment nitrogen fluxes and rates in the Pearl River Estuary region

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LI, Jiying; SUN, Jing, 2024, "Sediment nitrogen fluxes and rates in the Pearl River Estuary region", https://doi.org/10.14711/dataset/XMTKWW, DataSpace@HKUST, V1, UNF:6:svrLRM84MRM9/PMiwaj5ng== [fileUNF]

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Description	We estimate sediment oxygen uptake (SOU), ammonium flux (FNH4), rates of nitrification (Fnitrif.) and nitrogen removal through denitrification (FN2; Fdenitrif.) in the sediments in the Pearl River Estuary and the adjacent shelf waters. Data from other similar coastal ecosystems are also including for comparison. (2024-11-14)
Subject	Earth and Environmental Sciences
Keyword	coastal ocean, sediments, nitrogen cycle, The Pearl River Estuary
Notes	We collected water and sediment samples from the Pearl River Estuary and its adjacent coastal shelf. We measured dissolved oxygen, ammonium, and nitrate in the porewaters and particulate organic carbon and nitrogen. We estimate the sediment oxygen uptake using whole core incubations and estimate nitrogen fluxes (of ammonium and nitrate) using Fick’s law of diffusion. The rates of nitrification and N2 production were estimated using mass-balance model calculations. Water samples were collected using Rosette Niskin bottles attached to a Seabird 911plus conductivity-temperature-depth probe (CTD), which also profiled temperature and oxygen concentrations. Sediment samples were collected using a Uwitec corer. Oxygen profiles were measured using a Unisense microelectrode and the sediment oxygen uptake (SOU) was measured by using whole core incubations (Sun et al. 2024). Sediment cores were sectioned in a glove bag filled with N2, and porewaters were extracted using Rhizon Samplers of 0.1-𝜇m pore size. Porewater nitrate concentrations were measured using Dionex Aquion Ion Chromatography connected to a UV detector (Thermo Fisher ScientificTM, USA) with the wavelength of detection at 220 nm. Porewater ammonium concentrations were measured using the standard phenate method (APHA-4500-NH3) on a microplate reader (ClarioStar Plus, BMG Labtech, German). Sediment particulate organic carbon (POC) and particulate nitrogen (PN), as well as the physical properties, including water content, density, and porosity, were taken from Zhou 2022. Details of the model calculations for rates and fluxes are described in the metadata file (Metadata-PRE-N-JL). Data from literature were also complied for comparison. The complied data include those from the Changjiang Estuary region (Song et al. 2021), the Northern Gulf of Mexico (Lehrter et al. 2012, MaCarthy et al. 2013 and 2015), the Gulf of St Lawrence Alkhatib et al. 2012, Thibodeau et al. 2010, Mazur et al. 2021), and the Chesapeake Bay (Boynton et al. 2018, 2019, and 2022).
License/Data Use Agreement	CC BY 4.0

	1 to 3 of 3 Files	Original Format Archival Format (.tab)
	Metadata-PRE-N-JL.pdf Adobe PDF - 331.9 KB Published Nov 14, 2024 1 Download MD5: 6f38af8864e7163e4e1ce31cfe3d449d Metadata file describing the datasets	Preview "Metadata-PRE-N-JL.pdf" Access File File Access Public Download Options Adobe PDF Download Metadata Data File Citation EndNote XML RIS BibTeX
	PRE_sediment_N_flux_rate.tab Tabular Data - 31.9 KB Published Nov 14, 2024 1 Download 19 Variables, 408 Observations UNF:6:cv9VSCiDD1F+warYxPKDMQ== sediment fluxes of nitrate and ammonium and rates of nitrification and denitrification	Preview "PRE_sediment_N_flux_rate.tab" Access File File Access Public Download Options MS Excel Spreadsheet (Original File Format) Tab-Delimited RData Download Metadata Variable Metadata Data File Citation EndNote XML RIS BibTeX
	PRE_sediment_O2_NO3_NH4.tab Tabular Data - 77.7 KB Published Nov 14, 2024 1 Download 19 Variables, 867 Observations UNF:6:KYJhO5qJ5ZSppMRwt+1Y/g== sediment profiles of oxygen, nitrate, and ammonium	Preview "PRE_sediment_O2_NO3_NH4.tab" Access File File Access Public Download Options MS Excel Spreadsheet (Original File Format) Tab-Delimited RData Download Metadata Variable Metadata Data File Citation EndNote XML RIS BibTeX

Citation Metadata

Persistent Identifier	doi:10.14711/dataset/XMTKWW
Publication Date	2024-11-14
Title	Sediment nitrogen fluxes and rates in the Pearl River Estuary region
Author	LI, Jiying (The Hong Kong University of Science and Technology) - ORCID: 0000-0003-1677-6922 SUN, Jing (The Hong Kong University of Science and Technology) - ORCID: 0000-0002-7698-7679
Point of Contact	Use email button above to contact. LI, Jiying (The Hong Kong University of Science and Technology)
Description	We estimate sediment oxygen uptake (SOU), ammonium flux (FNH4), rates of nitrification (Fnitrif.) and nitrogen removal through denitrification (FN2; Fdenitrif.) in the sediments in the Pearl River Estuary and the adjacent shelf waters. Data from other similar coastal ecosystems are also including for comparison. (2024-11-14)
Subject	Earth and Environmental Sciences
Keyword	coastal ocean sediments nitrogen cycle The Pearl River Estuary
Notes	We collected water and sediment samples from the Pearl River Estuary and its adjacent coastal shelf. We measured dissolved oxygen, ammonium, and nitrate in the porewaters and particulate organic carbon and nitrogen. We estimate the sediment oxygen uptake using whole core incubations and estimate nitrogen fluxes (of ammonium and nitrate) using Fick’s law of diffusion. The rates of nitrification and N2 production were estimated using mass-balance model calculations. Water samples were collected using Rosette Niskin bottles attached to a Seabird 911plus conductivity-temperature-depth probe (CTD), which also profiled temperature and oxygen concentrations. Sediment samples were collected using a Uwitec corer. Oxygen profiles were measured using a Unisense microelectrode and the sediment oxygen uptake (SOU) was measured by using whole core incubations (Sun et al. 2024). Sediment cores were sectioned in a glove bag filled with N2, and porewaters were extracted using Rhizon Samplers of 0.1-𝜇m pore size. Porewater nitrate concentrations were measured using Dionex Aquion Ion Chromatography connected to a UV detector (Thermo Fisher ScientificTM, USA) with the wavelength of detection at 220 nm. Porewater ammonium concentrations were measured using the standard phenate method (APHA-4500-NH3) on a microplate reader (ClarioStar Plus, BMG Labtech, German). Sediment particulate organic carbon (POC) and particulate nitrogen (PN), as well as the physical properties, including water content, density, and porosity, were taken from Zhou 2022. Details of the model calculations for rates and fluxes are described in the metadata file (Metadata-PRE-N-JL). Data from literature were also complied for comparison. The complied data include those from the Changjiang Estuary region (Song et al. 2021), the Northern Gulf of Mexico (Lehrter et al. 2012, MaCarthy et al. 2013 and 2015), the Gulf of St Lawrence Alkhatib et al. 2012, Thibodeau et al. 2010, Mazur et al. 2021), and the Chesapeake Bay (Boynton et al. 2018, 2019, and 2022).
Funding Information	Research Grant Council (RGC) of the Hong Kong Special Administrative Region, China Center for Ocean Research in Hong Kong and Macau
Depositor	LI, Jiying
Deposit Date	2024-11-14
Date of Collection	Start: 2021-06-03 ; End: 2021-07-03
Related Dataset	LI, Jiying; SUN, Jing; YU, Liuqian; GAN, Jianping; YANG, Xingyu, 2024, "Sediment oxygen uptake and hypoxia in the Pearl River Estuary Region", https://doi.org/10.14711/dataset/KCLUQW, DataSpace@HKUST, V1, UNF:6:CkRCkLArRYmQqn66DS8NQw== [fileUNF]
Other Reference	Sun, J., L. Yu, X. Yang, J. Gan, H. Yin, and J. Li. 2024. Sediment oxygen uptake and hypoxia in coastal oceans, the Pearl River Estuary region. Water Res. 267: 122499. doi:10.1016/j.watres.2024.122499; Zhou, L. 2022. Sediment oxygen uptake and carbon mineralization in the Pearl River Estuary and adjacent coastal waters.doi:10.14711/thesis-991013088359403412; Boynton, W. R., M. A. C. Ceballos, C. L. S. Hodgkins, D. Liang, and J. M. Testa. 2022. Large-Scale Spatial and Temporal Patterns and Importance of Sediment–Water Oxygen and Nutrient Fluxes in the Chesapeake Bay Region. Estuaries Coasts 1–20. doi:10.1007/s12237-022-01127-0; Lehrter, J. C., D. L. Beddick, R. Devereux, D. F. Yates, and M. C. Murrell. 2012. Sediment-water fluxes of dissolved inorganic carbon, O2, nutrients, and N2 from the hypoxic region of the Louisiana continental shelf. Biogeochemistry 109: 233–252. doi:10.1007/s10533-011-9623-x; Mazur, C. I., A. N. Al-Haj, N. E. Ray, I. Sanchez-Viruet, and R. W. Fulweiler. 2021. Low denitrification rates and variable benthic nutrient fluxes characterize Long Island Sound sediments. Biogeochemistry 154: 37–62. doi:10.1007/s10533-021-00795-7; McCarthy, M. J., S. A. Carini, Z. Liu, N. E. Ostrom, and W. S. Gardner. 2013. Oxygen consumption in the water column and sediments of the northern Gulf of Mexico hypoxic zone. Estuar Coast Shelf Sci 123: 46–53. doi:10.1016/j.ecss.2013.02.019; McCarthy, M. J., S. E. Newell, S. A. Carini, and W. S. Gardner. 2015. Denitrification Dominates Sediment Nitrogen Removal and Is Enhanced by Bottom-Water Hypoxia in the Northern Gulf of Mexico. Estuaries Coasts 38: 2279–2294.; Song, G., S. Liu, J. Zhang, Z. Zhu, G. Zhang, H. K. Marchant, M. M. M. Kuypers, and G. Lavik. 2021. Response of benthic nitrogen cycling to estuarine hypoxia. Limnol Oceanogr 66: 652–666. doi:10.1002/lno.11630; Thibodeau, B., M. F. Lehmann, J. Kowarzyk, A. Mucci, Y. Gélinas, D. Gilbert, R. Maranger, and M. Alkhatib. 2010. Benthic nutrient fluxes along the Laurentian Channel: Impacts on the N budget of the St. Lawrence marine system. Estuar., Coast. Shelf Sci. 90: 195–205. doi:10.1016/j.ecss.2010.08.015

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Geographic Coverage	China
Geographic Bounding Box	112.488 114.252 22.602 21.501

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