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            <gco:CharacterString>Dette repository indeholder tre nationale kort over kvælstofretention i Danmark samt tilhørende usikkerheder. Filerne repræsenterer forskellige aspekter af kvælstoffjernelse fra kilde til kyst. “TotalRetention_regioner.tif” viser den samlede retention (fjernelse af kvælstof) fra udledningsstedet til kysten. “Grundvandsretention_regioner.tif” viser retentionen under transporten i grundvandet, mens “Overfladevandsretention.tif” viser retentionen i overfladevandsystemet, dvs. i vandløb, søer, vådområder og oversvømmede arealer. Kortene over samlet retention og grundvandsretention er aggregeret fra et 100 meter grid til regioner med en minimumsstørrelse på 50 hektar baseret på ligheder mellem nabogrids. For overfladevand er den geografiske opløsning defineret som oplandet, der bidrager med vand til det enkelte retentionsmiljø, f.eks. et søopland. Den samlede retention suppleres af to yderligere kort: “TotalRetention_usikkerhed_regioner.tif”, der viser usikkerheden i den samlede retention, beregnet for hver region, samt “TotalRetention_standardafvigelse_regioner.tif”, der viser standardafvigelsen mellem de enkelte grids inden for hver region. Alle kort er beregnet ud fra data for perioden 2000–2021. Kvælstofretentionskortene er udviklet i et samarbejde mellem GEUS og Aarhus Universitet (2025-08-29).

Dokumentation inkluderer bilag: National kvælstofmodel - version 2025. Udvikling af nye kvælstofretentionskort. Bilagsrapport. De Nationale Geologiske Undersøgelser for Danmark og Grønland. GEUS særudgivelse. ISBN 978-87-7871-620-0, https://doi.org/10.22008/gpub/38955.

Højberg, A.L., Thodsen, H., Børgesen, C.D. (red.) Andersen, A.H., Andersen, L.T., Audet, J., Bach, E.O., Christiansen, D.T., Christiansen, D.A., Conde, J.T., Falk, F.A., Frederiksen, R.R., Giannini-Kurina, F., Gudbjerg, J., Han sen, B., Henri, C.V., Henriksen, E.S., Hermansen, N., Hoffmann, C.C., Høyer, A., Iver sen, B.V., Jakobsen, R., Jørgensen, M.S., Kim, H., Kjeldgaard, A., Koch, J., Kronvang, B., , Liu, J., Madsen, R.B., Martin, N.L., Molis, M., Mortensen, M.H., Motevalli, A., Muff, E., Møller, I., Ondracek, M., Petersen, R.J., Pugliese, L., Rosenkrantz, A., Sandersen, P., Schneider, R.J.M., Sonnenborg, T.O., Stisen, S., Sørensen, P.B., Thorling, L., Tornbjerg, H., Troldborg, L., Uldall-Jessen, L., Voutchkova, D., Aamand, J.. 2025. National kvæl stofmodel - version 2025. Udvikling af nye kvælstofretentionskort. Metoderapport. De Na tionale Geologiske Undersøgelser for Danmark og Grønland. GEUS særudgivelse, ISBN 978-87-7871-619-4, https://doi.org/10.22008/gpub/38954 doi: 10.22008/gpub/38954.</gco:CharacterString>
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                  <gmd:LocalisedCharacterString locale="#DA">Dette repository indeholder tre nationale kort over kvælstofretention i Danmark samt tilhørende usikkerheder. Filerne repræsenterer forskellige aspekter af kvælstoffjernelse fra kilde til kyst. “TotalRetention_regioner.tif” viser den samlede retention (fjernelse af kvælstof) fra udledningsstedet til kysten. “Grundvandsretention_regioner.tif” viser retentionen under transporten i grundvandet, mens “Overfladevandsretention.tif” viser retentionen i overfladevandsystemet, dvs. i vandløb, søer, vådområder og oversvømmede arealer. Kortene over samlet retention og grundvandsretention er aggregeret fra et 100 meter grid til regioner med en minimumsstørrelse på 50 hektar baseret på ligheder mellem nabogrids. For overfladevand er den geografiske opløsning defineret som oplandet, der bidrager med vand til det enkelte retentionsmiljø, f.eks. et søopland. Den samlede retention suppleres af to yderligere kort: “TotalRetention_usikkerhed_regioner.tif”, der viser usikkerheden i den samlede retention, beregnet for hver region, samt “TotalRetention_standardafvigelse_regioner.tif”, der viser standardafvigelsen mellem de enkelte grids inden for hver region. Alle kort er beregnet ud fra data for perioden 2000–2021. Kvælstofretentionskortene er udviklet i et samarbejde mellem GEUS og Aarhus Universitet (2025-08-29).

Dokumentation inkluderer bilag: National kvælstofmodel - version 2025. Udvikling af nye kvælstofretentionskort. Bilagsrapport. De Nationale Geologiske Undersøgelser for Danmark og Grønland. GEUS særudgivelse. ISBN 978-87-7871-620-0, https://doi.org/10.22008/gpub/38955.

Højberg, A.L., Thodsen, H., Børgesen, C.D. (red.) Andersen, A.H., Andersen, L.T., Audet, J., Bach, E.O., Christiansen, D.T., Christiansen, D.A., Conde, J.T., Falk, F.A., Frederiksen, R.R., Giannini-Kurina, F., Gudbjerg, J., Han sen, B., Henri, C.V., Henriksen, E.S., Hermansen, N., Hoffmann, C.C., Høyer, A., Iver sen, B.V., Jakobsen, R., Jørgensen, M.S., Kim, H., Kjeldgaard, A., Koch, J., Kronvang, B., , Liu, J., Madsen, R.B., Martin, N.L., Molis, M., Mortensen, M.H., Motevalli, A., Muff, E., Møller, I., Ondracek, M., Petersen, R.J., Pugliese, L., Rosenkrantz, A., Sandersen, P., Schneider, R.J.M., Sonnenborg, T.O., Stisen, S., Sørensen, P.B., Thorling, L., Tornbjerg, H., Troldborg, L., Uldall-Jessen, L., Voutchkova, D., Aamand, J.. 2025. National kvæl stofmodel - version 2025. Udvikling af nye kvælstofretentionskort. Metoderapport. De Na tionale Geologiske Undersøgelser for Danmark og Grønland. GEUS særudgivelse, ISBN 978-87-7871-619-4, https://doi.org/10.22008/gpub/38954 doi: 10.22008/gpub/38954.</gmd:LocalisedCharacterString>
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                  <gmd:LocalisedCharacterString locale="#EN">This repository contains three national nitrogen retention maps for Denmark and associated uncertainties. “TotalRetention_regioner.tif” is the total retention (nitrogen removal) from the source location to the coast, “Grundvandsretention_regioner.tif” is the retention during transport in the groundwater and “Overfladevandsretention.tif” is the retention in the surface water system, i.e. streams, lakes, wetlands and inundated areas. The maps for the total and groundwater retention are aggregated from a 100 m grid into regions with a minimum size of 50 ha based on similarity between neighbouring grids. For surface water, the spatial resolution is defined as the contribution catchment discharging to the individual retention environments, e.g. a lake catchment. The total retention is supplemented by two maps “TotalRetention_usikkerhed_regioner.tif” showing the uncertainty in the total retention estimated for each region and “TotalRetention_standardafvigelse_regioner.tif” displaying the standard deviation between the individual grids within each region. All maps are calculated using data for the period 2000 – 2021. The nitrogen retention maps have been developed in a collaboration between GEUS and Aarhus University. (2025-08-29).

Documentation includes appendicies: National kvælstofmodel - version 2025. Udvikling af nye kvælstofretentionskort. Bilagsrapport. De Nationale Geologiske Undersøgelser for Danmark og Grønland. GEUS særudgivelse. ISBN 978-87-7871-620-0, https://doi.org/10.22008/gpub/38955.

Højberg, A.L., Thodsen, H., Børgesen, C.D. (red.) Andersen, A.H., Andersen, L.T., Audet, J., Bach, E.O., Christiansen, D.T., Christiansen, D.A., Conde, J.T., Falk, F.A., Frederiksen, R.R., Giannini-Kurina, F., Gudbjerg, J., Han sen, B., Henri, C.V., Henriksen, E.S., Hermansen, N., Hoffmann, C.C., Høyer, A., Iver sen, B.V., Jakobsen, R., Jørgensen, M.S., Kim, H., Kjeldgaard, A., Koch, J., Kronvang, B., , Liu, J., Madsen, R.B., Martin, N.L., Molis, M., Mortensen, M.H., Motevalli, A., Muff, E., Møller, I., Ondracek, M., Petersen, R.J., Pugliese, L., Rosenkrantz, A., Sandersen, P., Schneider, R.J.M., Sonnenborg, T.O., Stisen, S., Sørensen, P.B., Thorling, L., Tornbjerg, H., Troldborg, L., Uldall-Jessen, L., Voutchkova, D., Aamand, J.. 2025. National kvæl stofmodel - version 2025. Udvikling af nye kvælstofretentionskort. Metoderapport. De Na tionale Geologiske Undersøgelser for Danmark og Grønland. GEUS særudgivelse, ISBN 978-87-7871-619-4, https://doi.org/10.22008/gpub/38954 doi: 10.22008/gpub/38954.</gmd:LocalisedCharacterString>
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            <gco:CharacterString>Formålet med disse kort er at give et samlet og detaljeret overblik over kvælstofretentionen i Danmark, herunder hvor og hvordan kvælstof fjernes i både grundvand og overfladevand. Kortene kan bruges som et værktøj til at vurdere variationer, usikkerheder og regionale forskelle i kvælstoffjernelsen, hvilket kan støtte både forskning, forvaltning og planlægning af miljø- og vandforvaltningsindsatser.</gco:CharacterString>
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                  <gmd:LocalisedCharacterString locale="#DA">Formålet med disse kort er at give et samlet og detaljeret overblik over kvælstofretentionen i Danmark, herunder hvor og hvordan kvælstof fjernes i både grundvand og overfladevand. Kortene kan bruges som et værktøj til at vurdere variationer, usikkerheder og regionale forskelle i kvælstoffjernelsen, hvilket kan støtte både forskning, forvaltning og planlægning af miljø- og vandforvaltningsindsatser.</gmd:LocalisedCharacterString>
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                  <gmd:LocalisedCharacterString locale="#EN">The purpose of these maps is to provide a comprehensive and detailed overview of nitrogen retention in Denmark, including where and how nitrogen is removed in both groundwater and surface water. The maps can be used as a tool to assess variations, uncertainties, and regional differences in nitrogen removal, thereby supporting research, management, and planning of environmental and water management initiatives.</gmd:LocalisedCharacterString>
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                  <gco:CharacterString>Lineage for metadatasættet "National Kvælstofmodel – version 2020": Dataene stammer fra udviklingen af National Kvælstofmodel (NKM), som er designet til at kvantificere kvælstofudvaskning og -retention i danske vandmiljøer til støtte for miljøvurderinger og beslutningstagning. Modellen er udviklet af De Nationale Geologiske Undersøgelser for Danmark og Grønland (GEUS) i samarbejde med Aarhus Universitet og Klima-, Energi- og Forsyningsministeriet og blev offentliggjort i maj 2021. Udviklingen omfattede indsamling af omfattende data om jordbundsforhold, nedbør, landbrugspraksis og hydrologi, konstruktion af en numerisk model til simulering af kvælstoftransport og -omsætning, validering af modellen ved sammenligning med observerede data og implementering i et beslutningsstøtteværktøj. Modellen kombinerer processbaserede og statistiske metoder, herunder NLES-modellen til beregning af kvælstofudvaskning, hydrologiske modeller for grundvand og overfladevand samt GIS-baseret rumlig analyse og visualisering.</gco:CharacterString>
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                        <gmd:LocalisedCharacterString locale="#DA">Lineage for metadatasættet "National Kvælstofmodel – version 2020": Dataene stammer fra udviklingen af National Kvælstofmodel (NKM), som er designet til at kvantificere kvælstofudvaskning og -retention i danske vandmiljøer til støtte for miljøvurderinger og beslutningstagning. Modellen er udviklet af De Nationale Geologiske Undersøgelser for Danmark og Grønland (GEUS) i samarbejde med Aarhus Universitet og Klima-, Energi- og Forsyningsministeriet og blev offentliggjort i maj 2021. Udviklingen omfattede indsamling af omfattende data om jordbundsforhold, nedbør, landbrugspraksis og hydrologi, konstruktion af en numerisk model til simulering af kvælstoftransport og -omsætning, validering af modellen ved sammenligning med observerede data og implementering i et beslutningsstøtteværktøj. Modellen kombinerer processbaserede og statistiske metoder, herunder NLES-modellen til beregning af kvælstofudvaskning, hydrologiske modeller for grundvand og overfladevand samt GIS-baseret rumlig analyse og visualisering.</gmd:LocalisedCharacterString>
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                        <gmd:LocalisedCharacterString locale="#EN">Lineage for the dataset "National Nitrogen Model – version 2020": The data originates from the development of the Danish National Nitrogen Model (NKM), designed to quantify nitrogen leaching and retention in Danish aquatic environments to support environmental assessments and decision-making. The model was developed by the Geological Survey of Denmark and Greenland (GEUS) in collaboration with Aarhus University and the Danish Ministry of Climate, Energy and Utilities, and was published in May 2021. The development included the collection of extensive data on soil conditions, precipitation, agricultural practices and hydrology, the construction of a numerical model to simulate nitrogen transport and transformation, validation against observed data, and implementation in a decision support tool. The model combines process-based and statistical methods, including the NLES model for nitrogen leaching, hydrological models for groundwater and surface water, and GIS-based spatial analysis and visualization.</gmd:LocalisedCharacterString>
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