Contribution from a eutrophic temperate estuary to the landscape flux of nitrous oxide

Emeline Lequy; Eero Asmala; Andreas Ibrom; Benjamin Loubet; Raia Silvia Massad; Stiig Markager; Josette Garnier

doi:10.1016/j.watres.2022.118874

Contribution from a eutrophic temperate estuary to the landscape flux of nitrous oxide

Emeline Lequy^*, Eero Asmala, Andreas Ibrom, Benjamin Loubet, Raia Silvia Massad, Stiig Markager, Josette Garnier

^*Corresponding author af dette arbejde

Institut for Ecoscience - Marin biodiversitet og eksperimentel økologi

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

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Abstract

For mitigation of climate change, all sources and sinks of greenhouse gases from the environment must be quantified and their driving factors identified. Nitrous oxide (N₂O) is a strong greenhouse gas, and the contribution of aquatic systems to the global N₂O budget remains poorly constrained. In this study, we measured N₂O concentrations in a eutrophic coastal system, Roskilde Fjord (Denmark), and combined measurements with statistical modeling to quantify the N₂O fluxes and budget in the system over a period of six months. To do so, we collected water at 15 sampling points and measured N₂O concentrations along with physico-chemical water quality parameters, e.g. temperature, salinity, dissolved inorganic nitrogen and phosphorus, and silicon. We used mixed-effect regression models to predict N₂O concentrations in the water from water quality parameters. We then derived N₂O fluxes using well-established equations of N₂O solubility and water-atmosphere exchanges. These fluxes were then put in perspective with those measured at the landscape scale by eddy-covariance at a 96 m nearby tall tower, and to those estimated from the agricultural land next to the fjord using Intergovernmental Panel on Climate Change (IPCC) guidelines. N₂O concentrations in the Roskilde Fjord ranged between 2.40 and 8.05 nmol l⁻¹. The best fitting model between water parameters and N₂O concentrations in water included phosphorus and temperature. We estimated that (i) Roskilde Fjord was a sink of N₂O, with a median inward flux of -0.04 nmol m⁻² s⁻¹, (ii) while the surrounding median agricultural flux was 0.13-0.18 nmol m⁻² s⁻¹, and (iii) the median landscape flux was 0.07 nmol m⁻² s⁻¹. All estimates of N₂O fluxes were of the same magnitude and consistent with each other. These preliminary results need to be consolidated by further research.

Originalsprog	Engelsk
Artikelnummer	118874
Tidsskrift	Water Research
Vol/bind	222
ISSN	0043-1354
DOI	https://doi.org/10.1016/j.watres.2022.118874
Status	Udgivet - aug. 2022

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10.1016/j.watres.2022.118874Licens: CC BY

1-s2.0-S0043135422008211-mainForlagets udgivne version, 1,5 MBLicens: CC BY

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title = "Contribution from a eutrophic temperate estuary to the landscape flux of nitrous oxide",

abstract = "For mitigation of climate change, all sources and sinks of greenhouse gases from the environment must be quantified and their driving factors identified. Nitrous oxide (N2O) is a strong greenhouse gas, and the contribution of aquatic systems to the global N2O budget remains poorly constrained. In this study, we measured N2O concentrations in a eutrophic coastal system, Roskilde Fjord (Denmark), and combined measurements with statistical modeling to quantify the N2O fluxes and budget in the system over a period of six months. To do so, we collected water at 15 sampling points and measured N2O concentrations along with physico-chemical water quality parameters, e.g. temperature, salinity, dissolved inorganic nitrogen and phosphorus, and silicon. We used mixed-effect regression models to predict N2O concentrations in the water from water quality parameters. We then derived N2O fluxes using well-established equations of N2O solubility and water-atmosphere exchanges. These fluxes were then put in perspective with those measured at the landscape scale by eddy-covariance at a 96 m nearby tall tower, and to those estimated from the agricultural land next to the fjord using Intergovernmental Panel on Climate Change (IPCC) guidelines. N2O concentrations in the Roskilde Fjord ranged between 2.40 and 8.05 nmol l−1. The best fitting model between water parameters and N2O concentrations in water included phosphorus and temperature. We estimated that (i) Roskilde Fjord was a sink of N2O, with a median inward flux of -0.04 nmol m−2 s−1, (ii) while the surrounding median agricultural flux was 0.13-0.18 nmol m−2 s−1, and (iii) the median landscape flux was 0.07 nmol m−2 s−1. All estimates of N2O fluxes were of the same magnitude and consistent with each other. These preliminary results need to be consolidated by further research.",

keywords = "Eddy covariance, Greenhouse gas, Roskilde Fjord, Statistical modeling, Water-atmosphere interface",

author = "Emeline Lequy and Eero Asmala and Andreas Ibrom and Benjamin Loubet and Massad, {Raia Silvia} and Stiig Markager and Josette Garnier",

note = "Publisher Copyright: {\textcopyright} 2022",

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language = "English",

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T1 - Contribution from a eutrophic temperate estuary to the landscape flux of nitrous oxide

AU - Lequy, Emeline

AU - Asmala, Eero

AU - Ibrom, Andreas

AU - Loubet, Benjamin

AU - Massad, Raia Silvia

AU - Markager, Stiig

AU - Garnier, Josette

PY - 2022/8

Y1 - 2022/8

N2 - For mitigation of climate change, all sources and sinks of greenhouse gases from the environment must be quantified and their driving factors identified. Nitrous oxide (N2O) is a strong greenhouse gas, and the contribution of aquatic systems to the global N2O budget remains poorly constrained. In this study, we measured N2O concentrations in a eutrophic coastal system, Roskilde Fjord (Denmark), and combined measurements with statistical modeling to quantify the N2O fluxes and budget in the system over a period of six months. To do so, we collected water at 15 sampling points and measured N2O concentrations along with physico-chemical water quality parameters, e.g. temperature, salinity, dissolved inorganic nitrogen and phosphorus, and silicon. We used mixed-effect regression models to predict N2O concentrations in the water from water quality parameters. We then derived N2O fluxes using well-established equations of N2O solubility and water-atmosphere exchanges. These fluxes were then put in perspective with those measured at the landscape scale by eddy-covariance at a 96 m nearby tall tower, and to those estimated from the agricultural land next to the fjord using Intergovernmental Panel on Climate Change (IPCC) guidelines. N2O concentrations in the Roskilde Fjord ranged between 2.40 and 8.05 nmol l−1. The best fitting model between water parameters and N2O concentrations in water included phosphorus and temperature. We estimated that (i) Roskilde Fjord was a sink of N2O, with a median inward flux of -0.04 nmol m−2 s−1, (ii) while the surrounding median agricultural flux was 0.13-0.18 nmol m−2 s−1, and (iii) the median landscape flux was 0.07 nmol m−2 s−1. All estimates of N2O fluxes were of the same magnitude and consistent with each other. These preliminary results need to be consolidated by further research.

AB - For mitigation of climate change, all sources and sinks of greenhouse gases from the environment must be quantified and their driving factors identified. Nitrous oxide (N2O) is a strong greenhouse gas, and the contribution of aquatic systems to the global N2O budget remains poorly constrained. In this study, we measured N2O concentrations in a eutrophic coastal system, Roskilde Fjord (Denmark), and combined measurements with statistical modeling to quantify the N2O fluxes and budget in the system over a period of six months. To do so, we collected water at 15 sampling points and measured N2O concentrations along with physico-chemical water quality parameters, e.g. temperature, salinity, dissolved inorganic nitrogen and phosphorus, and silicon. We used mixed-effect regression models to predict N2O concentrations in the water from water quality parameters. We then derived N2O fluxes using well-established equations of N2O solubility and water-atmosphere exchanges. These fluxes were then put in perspective with those measured at the landscape scale by eddy-covariance at a 96 m nearby tall tower, and to those estimated from the agricultural land next to the fjord using Intergovernmental Panel on Climate Change (IPCC) guidelines. N2O concentrations in the Roskilde Fjord ranged between 2.40 and 8.05 nmol l−1. The best fitting model between water parameters and N2O concentrations in water included phosphorus and temperature. We estimated that (i) Roskilde Fjord was a sink of N2O, with a median inward flux of -0.04 nmol m−2 s−1, (ii) while the surrounding median agricultural flux was 0.13-0.18 nmol m−2 s−1, and (iii) the median landscape flux was 0.07 nmol m−2 s−1. All estimates of N2O fluxes were of the same magnitude and consistent with each other. These preliminary results need to be consolidated by further research.

KW - Eddy covariance

KW - Greenhouse gas

KW - Roskilde Fjord

KW - Statistical modeling

KW - Water-atmosphere interface

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U2 - 10.1016/j.watres.2022.118874

DO - 10.1016/j.watres.2022.118874

M3 - Journal article

C2 - 35914498

AN - SCOPUS:85135104144

SN - 0043-1354

VL - 222

JO - Water Research

JF - Water Research

M1 - 118874

ER -

Contribution from a eutrophic temperate estuary to the landscape flux of nitrous oxide

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