Estimating internal phosphorus loading for a water quality model using chemical characterisation of sediment phosphorus and contrasting oxygen conditions

Irma Puttonen; Kaarina Lukkari; Elina Miettunen; Janne Ropponen; Laura Tuomi

doi:10.1016/j.scitotenv.2024.173717

Estimating internal phosphorus loading for a water quality model using chemical characterisation of sediment phosphorus and contrasting oxygen conditions

Irma Puttonen^*
, Kaarina Lukkari
, Elina Miettunen
, Janne Ropponen
, Laura Tuomi

^*Tämän työn vastaava kirjoittaja

Ympäristö- ja meribiologia

Tutkimustuotos: Lehtiartikkeli › Artikkeli › Tieteellinen › vertaisarvioitu

12 Sitaatiot (Scopus)

Abstrakti

The Finnish Archipelago Sea (AS) has long been subject to intensive anthropogenic phosphorus (P) loading. The area suffers from seasonal hypoxia and cyanobacterial blooms despite reductions in nutrient discharge from the catchment and point sources. Internal loading may even dominate the P budget. Previous estimates of internal P loading have limitations (e.g., in spatial coverage and infrequent measurements). We present the first area-wide estimates of the magnitude of internal P loading based on the long-term release of P stored in the sediments. Modelling the internal P loading in the AS is challenging due to the complexity of biogeochemical processes in the sediment-water interface, as well as the heterogenic topography of the seafloor. Instead, we calculated estimates of internal P loading based on data from previous studies on sequential chemical extraction of sediment P, sediment physical characteristics (e.g., organic content, location of muddy seabed substrates), and near-bottom oxygen (O₂) conditions. The estimates in three scenarios of contrasting O₂ conditions were based on potentially mobile P pools in the sediments, recycled from sediment to water (i.e., loosely-bound or exchangeable P, P bound to reducible iron oxy(hydr)oxides, and labile organic P). The potentially mobile P pools were determined by chemical extraction methods (modified from Psenner et al., 1984 and Ruttenberg, 1992). The internal P loading under presumable O₂ conditions was estimated to be fivefold that of waterborne P input to the AS; comparable to previous estimates for hypoxic areas in the Baltic Sea. Our estimates revealed wide spatial variability in the internal P loading, depending on O₂ conditions and seabed sediment substrate. The site-specific P release estimates are included in a water quality model used by regional authorities, which increases the model's reliability for estimating the impact of human activities on the water quality across the AS.

Alkuperäiskieli	Englanti
Artikkeli	173717
Julkaisu	Science of the Total Environment
Vuosikerta	942
DOI - pysyväislinkit	https://doi.org/10.1016/j.scitotenv.2024.173717
Tila	Julkaistu - 10 syysk. 2024
OKM-julkaisutyyppi	A1 Julkaistu artikkeli, soviteltu

Rahoitus

The model development was funded by the Ministry of the Environment of Finland , the Finnish Environment Institute , the Finnish Meteorological Institute and the Centres for Economic Development, Transport and the Environment . We want to thank the project SEABED in the EU Central Baltic INTERREG IVA programme for sediment and water data and the PyWQM model code, and the government of \u00C5land for the water quality monitoring data in \u00C5land. The bathymetric data used to compile the coastal grid for the hydrodynamic model was obtained from the Finnish Transport Agency's coastal nautical charts and the contemporaneous VELMU map service (no longer available). Salinity and temperature profiles for the open sea boundary at Kattegat were produced using E.U. Copernicus Marine Service Information ( http://marine.copernicus.eu/ ). Sea level data was obtained from the SMHI open data service ( http://opendata-download-ocobs.smhi.se/explore/ ), licensed under the Creative Commons CC-BY-2.5 license. STR\u00C5NG data used here are from the Swedish Meteorological and Hydrological Institute (SMHI) and were produced with support from the Swedish Radiation Protection Authority and the Swedish Environmental Agency. Life IP Biodiversea project provided facilities for the manuscript preparation. We thank Dr. Johanna Mattila for her valuable comments on improving the manuscript and Dr. Roxana Preston for linguistic proofreading.

Pääsy asiakirjaan

10.1016/j.scitotenv.2024.173717

Muut tiedostot ja linkit

Linkki julkaisuun Scopuksessa

Viittausmuodot

@article{90e64e9584814ef5b19df489a7308746,

title = "Estimating internal phosphorus loading for a water quality model using chemical characterisation of sediment phosphorus and contrasting oxygen conditions",

abstract = "The Finnish Archipelago Sea (AS) has long been subject to intensive anthropogenic phosphorus (P) loading. The area suffers from seasonal hypoxia and cyanobacterial blooms despite reductions in nutrient discharge from the catchment and point sources. Internal loading may even dominate the P budget. Previous estimates of internal P loading have limitations (e.g., in spatial coverage and infrequent measurements). We present the first area-wide estimates of the magnitude of internal P loading based on the long-term release of P stored in the sediments. Modelling the internal P loading in the AS is challenging due to the complexity of biogeochemical processes in the sediment-water interface, as well as the heterogenic topography of the seafloor. Instead, we calculated estimates of internal P loading based on data from previous studies on sequential chemical extraction of sediment P, sediment physical characteristics (e.g., organic content, location of muddy seabed substrates), and near-bottom oxygen (O2) conditions. The estimates in three scenarios of contrasting O2 conditions were based on potentially mobile P pools in the sediments, recycled from sediment to water (i.e., loosely-bound or exchangeable P, P bound to reducible iron oxy(hydr)oxides, and labile organic P). The potentially mobile P pools were determined by chemical extraction methods (modified from Psenner et al., 1984 and Ruttenberg, 1992). The internal P loading under presumable O2 conditions was estimated to be fivefold that of waterborne P input to the AS; comparable to previous estimates for hypoxic areas in the Baltic Sea. Our estimates revealed wide spatial variability in the internal P loading, depending on O2 conditions and seabed sediment substrate. The site-specific P release estimates are included in a water quality model used by regional authorities, which increases the model's reliability for estimating the impact of human activities on the water quality across the AS.",

keywords = "Archipelago Sea, Coastal eutrophication, Environmental management, Potential phosphorus release, Seafloor sediment geochemistry",

author = "Irma Puttonen and Kaarina Lukkari and Elina Miettunen and Janne Ropponen and Laura Tuomi",

note = "AM 24m https://www.elsevier.com/about/policies-and-standards/sharing Publisher Copyright: {\textcopyright} 2024",

year = "2024",

month = sep,

day = "10",

doi = "10.1016/j.scitotenv.2024.173717",

language = "English",

volume = "942",

journal = "Science of the Total Environment",

issn = "0048-9697",

publisher = "Elsevier",

}

Estimating internal phosphorus loading for a water quality model using chemical characterisation of sediment phosphorus and contrasting oxygen conditions. / Puttonen, Irma; Lukkari, Kaarina; Miettunen, Elina et al.
julkaisussa: Science of the Total Environment, Vuosikerta 942, 173717, 10.09.2024.

Tutkimustuotos: Lehtiartikkeli › Artikkeli › Tieteellinen › vertaisarvioitu

TY - JOUR

T1 - Estimating internal phosphorus loading for a water quality model using chemical characterisation of sediment phosphorus and contrasting oxygen conditions

AU - Puttonen, Irma

AU - Lukkari, Kaarina

AU - Miettunen, Elina

AU - Ropponen, Janne

AU - Tuomi, Laura

PY - 2024/9/10

Y1 - 2024/9/10

N2 - The Finnish Archipelago Sea (AS) has long been subject to intensive anthropogenic phosphorus (P) loading. The area suffers from seasonal hypoxia and cyanobacterial blooms despite reductions in nutrient discharge from the catchment and point sources. Internal loading may even dominate the P budget. Previous estimates of internal P loading have limitations (e.g., in spatial coverage and infrequent measurements). We present the first area-wide estimates of the magnitude of internal P loading based on the long-term release of P stored in the sediments. Modelling the internal P loading in the AS is challenging due to the complexity of biogeochemical processes in the sediment-water interface, as well as the heterogenic topography of the seafloor. Instead, we calculated estimates of internal P loading based on data from previous studies on sequential chemical extraction of sediment P, sediment physical characteristics (e.g., organic content, location of muddy seabed substrates), and near-bottom oxygen (O2) conditions. The estimates in three scenarios of contrasting O2 conditions were based on potentially mobile P pools in the sediments, recycled from sediment to water (i.e., loosely-bound or exchangeable P, P bound to reducible iron oxy(hydr)oxides, and labile organic P). The potentially mobile P pools were determined by chemical extraction methods (modified from Psenner et al., 1984 and Ruttenberg, 1992). The internal P loading under presumable O2 conditions was estimated to be fivefold that of waterborne P input to the AS; comparable to previous estimates for hypoxic areas in the Baltic Sea. Our estimates revealed wide spatial variability in the internal P loading, depending on O2 conditions and seabed sediment substrate. The site-specific P release estimates are included in a water quality model used by regional authorities, which increases the model's reliability for estimating the impact of human activities on the water quality across the AS.

AB - The Finnish Archipelago Sea (AS) has long been subject to intensive anthropogenic phosphorus (P) loading. The area suffers from seasonal hypoxia and cyanobacterial blooms despite reductions in nutrient discharge from the catchment and point sources. Internal loading may even dominate the P budget. Previous estimates of internal P loading have limitations (e.g., in spatial coverage and infrequent measurements). We present the first area-wide estimates of the magnitude of internal P loading based on the long-term release of P stored in the sediments. Modelling the internal P loading in the AS is challenging due to the complexity of biogeochemical processes in the sediment-water interface, as well as the heterogenic topography of the seafloor. Instead, we calculated estimates of internal P loading based on data from previous studies on sequential chemical extraction of sediment P, sediment physical characteristics (e.g., organic content, location of muddy seabed substrates), and near-bottom oxygen (O2) conditions. The estimates in three scenarios of contrasting O2 conditions were based on potentially mobile P pools in the sediments, recycled from sediment to water (i.e., loosely-bound or exchangeable P, P bound to reducible iron oxy(hydr)oxides, and labile organic P). The potentially mobile P pools were determined by chemical extraction methods (modified from Psenner et al., 1984 and Ruttenberg, 1992). The internal P loading under presumable O2 conditions was estimated to be fivefold that of waterborne P input to the AS; comparable to previous estimates for hypoxic areas in the Baltic Sea. Our estimates revealed wide spatial variability in the internal P loading, depending on O2 conditions and seabed sediment substrate. The site-specific P release estimates are included in a water quality model used by regional authorities, which increases the model's reliability for estimating the impact of human activities on the water quality across the AS.

KW - Archipelago Sea

KW - Coastal eutrophication

KW - Environmental management

KW - Potential phosphorus release

KW - Seafloor sediment geochemistry

UR - https://www.scopus.com/pages/publications/85195571435

U2 - 10.1016/j.scitotenv.2024.173717

DO - 10.1016/j.scitotenv.2024.173717

M3 - Article

C2 - 38851331

AN - SCOPUS:85195571435

SN - 0048-9697

VL - 942

JO - Science of the Total Environment

JF - Science of the Total Environment

M1 - 173717

ER -

Estimating internal phosphorus loading for a water quality model using chemical characterisation of sediment phosphorus and contrasting oxygen conditions

Abstrakti

Rahoitus

Pääsy asiakirjaan

Muut tiedostot ja linkit

Sormenjälki

Viittausmuodot