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Publikationer (10 of 20) Visa alla publikationer
Strombäck, L., Pers, C., Strömqvist, J., Lindström, G. & Gustavsson, J. (2019). A web based analysis and scenario tool for eutrophication of inland waters for Sweden and Europe. Environmental Modelling & Software, 111, 259-267
Öppna denna publikation i ny flik eller fönster >>A web based analysis and scenario tool for eutrophication of inland waters for Sweden and Europe
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2019 (Engelska)Ingår i: Environmental Modelling & Software, ISSN 1364-8152, E-ISSN 1873-6726, Vol. 111, s. 259-267Artikel i tidskrift (Refereegranskat) Published
Nationell ämneskategori
Oceanografi, hydrologi och vattenresurser
Forskningsämne
Hydrologi
Identifikatorer
urn:nbn:se:smhi:diva-5017 (URN)10.1016/j.envsoft.2018.07.012 (DOI)000451631300020 ()
Tillgänglig från: 2018-12-12 Skapad: 2018-12-12 Senast uppdaterad: 2018-12-12Bibliografiskt granskad
Olsson, J., Pers, C., Bengtsson, L., Pechlivanidis, I., Berg, P. & Körnich, H. (2017). Distance-dependent depth-duration analysis in high-resolution hydro-meteorological ensemble forecasting: A case study in Malmo City, Sweden. Environmental Modelling & Software, 93, 381-397
Öppna denna publikation i ny flik eller fönster >>Distance-dependent depth-duration analysis in high-resolution hydro-meteorological ensemble forecasting: A case study in Malmo City, Sweden
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2017 (Engelska)Ingår i: Environmental Modelling & Software, ISSN 1364-8152, E-ISSN 1873-6726, Vol. 93, s. 381-397Artikel i tidskrift (Refereegranskat) Published
Nationell ämneskategori
Oceanografi, hydrologi och vattenresurser
Forskningsämne
Hydrologi
Identifikatorer
urn:nbn:se:smhi:diva-4135 (URN)10.1016/j.envsoft.2017.03.025 (DOI)000403512500026 ()
Tillgänglig från: 2017-08-08 Skapad: 2017-08-08 Senast uppdaterad: 2018-01-13Bibliografiskt granskad
Yin, Y., Jiang, S., Pers, C., Yang, X., Liu, Q., Yuan, J., . . . Zheng, Z. (2016). Assessment of the Spatial and Temporal Variations of Water Quality for Agricultural Lands with Crop Rotation in China by Using a HYPE Model. International Journal of Environmental Research and Public Health, 13(3)
Öppna denna publikation i ny flik eller fönster >>Assessment of the Spatial and Temporal Variations of Water Quality for Agricultural Lands with Crop Rotation in China by Using a HYPE Model
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2016 (Engelska)Ingår i: International Journal of Environmental Research and Public Health, ISSN 1661-7827, E-ISSN 1660-4601, Vol. 13, nr 3Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Many water quality models have been successfully used worldwide to predict nutrient losses from anthropogenically impacted catchments, but hydrological and nutrient simulations with limited data are difficult considering the transfer of model parameters and complication of model calibration and validation. This study aims: (i) to assess the performance capabilities of a new and relatively more advantageous model, namely, Hydrological Predictions for the Environment (HYPE), that simulates stream flow and nutrient load in agricultural areas by using a multi-site and multi-objective parameter calibration method and (ii) to investigate the temporal and spatial variations of total nitrogen (TN) and total phosphorous (TP) concentrations and loads with crop rotation by using the model for the first time. A parameter estimation tool (PEST) was used to calibrate parameters. Results show that the parameters related to the effective soil porosity were highly sensitive to hydrological modeling. N balance was largely controlled by soil denitrification processes. P balance was influenced by the sedimentation rate and production/decay of P in rivers and lakes. The model reproduced the temporal and spatial variations of discharge and TN/TP relatively well in both calibration (2006-2008) and validation (2009-2010) periods. Among the obtained data, the lowest Nash-Suttclife efficiency of discharge, daily TN load, and daily TP load were 0.74, 0.51, and 0.54, respectively. The seasonal variations of daily TN concentrations in the entire simulation period were insufficient, indicated that crop rotation changed the timing and amount of N output. Monthly TN and TP simulation yields revealed that nutrient outputs were abundant in summer in terms of the corresponding discharge. The area-weighted TN and TP load annual yields in five years showed that nutrient loads were extremely high along Hong and Ru rivers, especially in agricultural lands.

Nationell ämneskategori
Oceanografi, hydrologi och vattenresurser
Forskningsämne
Hydrologi
Identifikatorer
urn:nbn:se:smhi:diva-2023 (URN)10.3390/ijerph13030336 (DOI)000373528600001 ()
Tillgänglig från: 2016-05-04 Skapad: 2016-05-02 Senast uppdaterad: 2018-01-10Bibliografiskt granskad
Arheimer, B. & Pers, C. (2016). Lessons learned? Effects of nutrient reductions from constructing wetlands in 1996–2006 across Sweden. Ecological Engineering: The Journal of Ecotechnology, 1-11
Öppna denna publikation i ny flik eller fönster >>Lessons learned? Effects of nutrient reductions from constructing wetlands in 1996–2006 across Sweden
2016 (Engelska)Ingår i: Ecological Engineering: The Journal of Ecotechnology, ISSN 0925-8574, E-ISSN 1872-6992, s. 1-11Artikel i tidskrift (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
Elsevier, 2016
Nationell ämneskategori
Oceanografi, hydrologi och vattenresurser
Forskningsämne
Hydrologi
Identifikatorer
urn:nbn:se:smhi:diva-4051 (URN)10.1016/j.ecoleng.2016.01.088 (DOI)
Tillgänglig från: 2017-04-24 Skapad: 2017-04-24 Senast uppdaterad: 2018-01-13Bibliografiskt granskad
Pers, C., Temnerud, J. & Lindström, G. (2016). Modelling water, nutrients, and organic carbon in forested catchments: a HYPE application. Hydrological Processes, 30(18), 3252-3273
Öppna denna publikation i ny flik eller fönster >>Modelling water, nutrients, and organic carbon in forested catchments: a HYPE application
2016 (Engelska)Ingår i: Hydrological Processes, ISSN 0885-6087, E-ISSN 1099-1085, Vol. 30, nr 18, s. 3252-3273Artikel i tidskrift (Refereegranskat) Published
Nationell ämneskategori
Oceanografi, hydrologi och vattenresurser
Forskningsämne
Hydrologi
Identifikatorer
urn:nbn:se:smhi:diva-3335 (URN)10.1002/hyp.10830 (DOI)000383466900011 ()
Tillgänglig från: 2016-10-18 Skapad: 2016-10-18 Senast uppdaterad: 2018-01-14Bibliografiskt granskad
Winterdahl, M., Laudon, H., Lyon, S. W., Pers, C. & Bishop, K. (2016). Sensitivity of stream dissolved organic carbon to temperature and discharge: Implications of future climates. Journal of Geophysical Research - Biogeosciences, 121(1), 126-144
Öppna denna publikation i ny flik eller fönster >>Sensitivity of stream dissolved organic carbon to temperature and discharge: Implications of future climates
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2016 (Engelska)Ingår i: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, E-ISSN 2169-8961, Vol. 121, nr 1, s. 126-144Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Dissolved organic carbon (DOC) is a significant constituent in aquatic ecosystems with concentrations in streams influenced by both temperature and water flow pathway dynamics associated with changes in discharge (streamflow). We investigated the sensitivity of DOC concentrations in 12 high-latitude headwater streams to changes in temperature and discharge using a mathematical model. The implications of differences in sensitivities were explored by using downscaled projections of air temperature and discharge to simulate possible trajectories of DOC concentrations in a changing climate. We found two distinct responses: (i) catchments where stream DOC sensitivity was high to temperature but low to discharge and (ii) catchments where stream DOC sensitivity was low to temperature but high to discharge. Streams with strong seasonal DOC dynamics were more sensitive to temperature changes than nonseasonal systems. In addition, stream DOC sensitivity to discharge was strongly correlated with vertical soil water DOC differences in the near-stream zone. Simulations of possible future changes in DOC concentrations indicated median increases of about 4-24% compared to current levels when using projections of air temperature and discharge but even larger increases were observed for base flow concentrations (13-42%). Streams with high-temperature sensitivity showed the largest increases in DOC concentrations. Our results suggest that future climatic changes could bring significant increases in surface water DOC concentrations in boreal and hemiboreal areas but that the response ultimately is dependent on vertical soil solution DOC differences and soil organic carbon distribution.

Nationell ämneskategori
Oceanografi, hydrologi och vattenresurser
Forskningsämne
Hydrologi
Identifikatorer
urn:nbn:se:smhi:diva-2049 (URN)10.1002/2015JG002922 (DOI)000370173100008 ()
Tillgänglig från: 2016-05-02 Skapad: 2016-05-02 Senast uppdaterad: 2018-01-10Bibliografiskt granskad
Lindström, G., Pers, C., Rosberg, J., Strömqvist, J. & Arheimer, B. (2010). Development and testing of the HYPE (Hydrological Predictions for the Environment) water quality model for different spatial scales. HYDROLOGY RESEARCH, 41(3-4), 295-319
Öppna denna publikation i ny flik eller fönster >>Development and testing of the HYPE (Hydrological Predictions for the Environment) water quality model for different spatial scales
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2010 (Engelska)Ingår i: HYDROLOGY RESEARCH, ISSN 1998-9563, Vol. 41, nr 3-4, s. 295-319Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The HYPE model is a hydrological model for small-scale and large-scale assessments of water resources and water quality, developed at the Swedish Meteorological and Hydrological Institute during 2005-2007. In the model, the landscape is divided into classes according to soil type, land use and altitude. In agricultural lands the soil is divided into three layers, each with individual computations of soil wetness and nutrient processes. The model simulates water flow and transport and turnover of nitrogen and phosphorus. Nutrients follow the same pathways as water in the model: surface runoff, macropore flow, tile drainage and outflow from individual soil layers. Rivers and lakes are described separately with routines for turnover of nutrients in each environment. Model parameters are global, or coupled to soil type or land use. The model was evaluated both by local calibrations to internal variables from different test basins and to data on discharge and nutrients from a large number of small basins. In addition, the estimated parameters were transferred to two larger basins in southern Sweden: River Ronnea and River Vindan. The resulting simulations were generally in good agreement with observations.

Nyckelord
high resolution, hydrological model, modelling system, nutrients, scenarios, spatially distributed
Nationell ämneskategori
Oceanografi, hydrologi och vattenresurser
Forskningsämne
Hydrologi
Identifikatorer
urn:nbn:se:smhi:diva-593 (URN)10.2166/nh.2010.007 (DOI)000279499700011 ()
Tillgänglig från: 2015-04-20 Skapad: 2015-04-20 Senast uppdaterad: 2018-01-11Bibliografiskt granskad
Pers, C. (2007). HBV-NP Model Manual. SMHI
Öppna denna publikation i ny flik eller fönster >>HBV-NP Model Manual
2007 (Engelska)Rapport (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
SMHI, 2007. s. 80
Serie
Hydrologi, ISSN 0283-7722 ; 103
Identifikatorer
urn:nbn:se:smhi:diva-2748 (URN)Hydrologi, Rapporter, Serie Hydrologi (Lokalt ID)Hydrologi, Rapporter, Serie Hydrologi (Arkivnummer)Hydrologi, Rapporter, Serie Hydrologi (OAI)
Tillgänglig från: 2007-09-18 Skapad: 2016-07-08 Senast uppdaterad: 2016-07-08Bibliografiskt granskad
Arheimer, B. & Pers, C. (2007). Kväveretention i svenska sjöar och vattendrag – betydelse för utsläpp från reningsverk. SMHI
Öppna denna publikation i ny flik eller fönster >>Kväveretention i svenska sjöar och vattendrag – betydelse för utsläpp från reningsverk
2007 (Svenska)Rapport (Övrigt vetenskapligt)
Abstract [sv]

Den här rapporten har tagits fram på uppdrag av Naturvårdsverket för att underlätta diskussionen med EU-kommissionen, som har annonserat att den tänker stämma Sverige inför EU-domstolen för otillräckligt genomförande av avloppsdirektivet. Vid bedömningen av vilka reningsverk som omfattas av krav på kväverening tas i Sverige hänsyn till den naturliga avskiljning (retention) som sker i vattendrag under transporten från utsläppskälla till havet.Kväveretention är ett vedertaget begrepp som inkluderar ett flertal naturliga biogeokemiska processer som permanent reducerar kväve från vattenfasen i sjöar och vattendrag. Speciellt stor är effekten i sjörika områden. Naturlig retention är dock svår att mäta. I Sverige har man utvecklat ett modellsystem för storskalig beräkning av närsalttransport, inklusive retention, från land till hav med relativt hög geografisk upplösning. Systemet kopplar fältskalemodeller med avrinningsmodeller (HBV-NP), är vetenskapligt dokumenterat och granskat och har tillämpats storskaligt sedan 1997 för internationell rapportering till HELCOM.Det är stor skillnad i sjöars retentionskapacitet; i norra delarna av landet är den låg medan sjöarna i de södra delarna av landet är betydligt effektivare som kvävesänkor. Totalt reduceras ca 30 000 tonkväve per år i sjöar och vattendrag, varav 70% i södra Sverige.De reningsverk vars utsläpp passerar fler sjöar får liten påverkan på havet. Naturlig kväveretention i vattendrag och sjöar reducerar de svenska reningsverkens bidrag till kusten med 3200 ton/år, vilketmotsvarar 18% av reningsverkens totala utsläpp. Retentionen varierar dock betydligt mellan olika delar av landet. De flesta reningsverk med större utsläpp finns längs kusten och i södra Sverige.

Abstract [en]

This report has been compiled on request of the Swedish Environmental Protection Agency to facilitate the discussion with the EU Commission. The EU Commission has announced that it will take Sweden to the European Court of Justice for failing to ensure proper treatment of urban waste water according to the Urban Waste Water Treatment Directive (Directive 91/271/EEC). In Sweden natural nitrogen removal (retention) in waterbodies is considered as part of the treatment of emissions, when transported to the sea. Nitrogen retention is a well-known phenomenon that includes several natural biogeochemical processes, which permanently remove nitrogen from the water. The effect may be considerable in areas with many lakes. Sweden has 92 000 lakes larger than 1 hectare. It is rather normal with 30-70% nitrogen retention in Swedish lakes and rivers. The main process for natural nitrogen retention is denitrification, which is the same process that is applied for biological treatment in waste water plants. Natural retention is hard to measure, however, and has to be estimated based on several assumptions like so many other fluxes in nature. In Sweden a model system has been developed for large-scale calculation of nutrient transport, including retention, from land to the sea, with relatively high geographic resolution. The system couples field-scale models with catchment models and is scientifically documented and reviewed. It has been applied since 1997 for international reporting to HELCOM. The catchment model (HBVNP) is tuned and evaluated against monitored time-series of measurements where such are available. The nitrogen retention that is calculated with HBV-NP is composed of nitrogen that is permanently transferred to the atmosphere and sediment, and which therefore will not further contribute to the eutrophication of water systems.

Ort, förlag, år, upplaga, sidor
SMHI, 2007. s. 42
Serie
Hydrologi, ISSN 0283-7722 ; 107
Nyckelord
HBV-NP, retention, övergödning, reningsverk, kväveutsläpp
Identifikatorer
urn:nbn:se:smhi:diva-2254 (URN)Hydrologi, Rapporter, Serie Hydrologi (Lokalt ID)Hydrologi, Rapporter, Serie Hydrologi (Arkivnummer)Hydrologi, Rapporter, Serie Hydrologi (OAI)
Tillgänglig från: 2007-09-28 Skapad: 2016-07-08 Senast uppdaterad: 2016-07-08Bibliografiskt granskad
Arheimer, B., Andreasson, J., Fogelberg, S., Johnsson, H., Pers, C. & Persson, K. (2005). Climate change impact on water quality: Model results from southern Sweden. Ambio, 34(7), 559-566
Öppna denna publikation i ny flik eller fönster >>Climate change impact on water quality: Model results from southern Sweden
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2005 (Engelska)Ingår i: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 34, nr 7, s. 559-566Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Starting from six regional climate change scenarios, nitrogen leaching from arable-soil, water discharge, and nitrogen retention was modeled in the Ronnea catchment. Additionally, biological response was modeled in the eutrophic Lake Ringsjon. The results are compared with similar studies on other catchments. All scenarios gave similar impact on water quality but varied in quantities. However, one scenario resulted in a different transport pattern due to less-pronounced seasonal variations in the hydrology. On average, the study shows that, in a future climate, we might expect: i) increased concentrations of nitrogen in the arable root zone (+50%) and in the river (+13%); ii) increased annual load of nitrogen from land to sea (+22%) due to more pronounced winter high flow; moreover, remote areas in the catchment may start to contribute to the outlet load; iii) radical changes in lake biochemistry with increased concentrations of total phosphorus (+50%), total nitrogen (+20%), and planktonic algae such as cyanobacteria (+80%).

Nationell ämneskategori
Oceanografi, hydrologi och vattenresurser
Forskningsämne
Hydrologi
Identifikatorer
urn:nbn:se:smhi:diva-1260 (URN)10.1639/0044-7447(2005)034[0559:CCIOWQ]2.0.CO;2 (DOI)000233522100012 ()16435746 (PubMedID)
Tillgänglig från: 2015-07-28 Skapad: 2015-05-26 Senast uppdaterad: 2018-01-11Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-4563-2752

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