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Climate Change Impacts on the Catchment Contribution to Lake Water Quantity and Quality
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
2007 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

A key question related to climate change projections is how will aquatic systems respond to changes in variables such as temperature and precipitation? This thesis uses GWLF, a simple catchment scale model to explore potential impacts of climate change on water quantity and quality.

River discharge and nutrient loads were modelled for several warmer world scenarios. For one catchment in New York, USA changes in annual dissolved phosphorus loads decreased along with annual streamflow, and particulate phosphorus loads increased for a single future climate scenario. For the Galten catchment of Lake Mälaren, Sweden, the spring melt peak observed historically was reduced for six future scenarios. Peak runoff and dissolved phosphorus and nitrogen load maxima occurred in winter rather than early spring.

A synthesis of model results for dissolved inorganic nitrogen (DIN) loadings for five European catchments showed changes in the timing and magnitude of peak DIN load for several future scenarios. In northern Europe, changes were largely due to increased winter streamflow and reduced snow pack and spring melt runoff. In western Europe, DIN loads increased in winter or early spring due to increased precipitation.

The biological response for a warmer future scenario was modelled for the Galten basin of Lake Mälaren using GWLF coupled to a lake phytoplankton model and a physical lake model. An increase in cyanobacteria biomass accompanied by a decline in diatom biomass resulted from changes in the timing of nutrient export from the catchment. The projected increase in lake temperature favored an overall increase in total phytoplankton biomass.

Lastly, a method based on hourly measurements of colored dissolved organic matter (CDOM) fluorescence provides the appropriate data for dissolved organic carbon (DOC) model parameterization and may also be used for surveillance of organic matter inputs to lakes.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis , 2007. , s. 35
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 347
Nyckelord [en]
Climate change, water quality modelling, Lake Mälaren, GWLF, nutrient transport
Nationell ämneskategori
Ekologi
Identifikatorer
URN: urn:nbn:se:uu:diva-8236ISBN: 978-91-554-6980-1 (tryckt)OAI: oai:DiVA.org:uu-8236DiVA, id: diva2:170783
Disputation
2007-10-25, Zootissalen, Evolutionsbiologistcentrum, Norbyvägen 18, Uppsala, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2007-10-04 Skapad: 2007-10-04 Senast uppdaterad: 2016-04-28Bibliografiskt granskad
Delarbeten
1. Impacts of projected climate change on phosphorus and sediment loadings for a New York City water supply reservoir
Öppna denna publikation i ny flik eller fönster >>Impacts of projected climate change on phosphorus and sediment loadings for a New York City water supply reservoir
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2006 Ingår i: Verh. Internat. Verein. Limnol., Vol. 29, s. 1829-1832Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-96262 (URN)
Tillgänglig från: 2007-10-04 Skapad: 2007-10-04Bibliografiskt granskad
2. Effects of Warmer World Scenarios on Hydrologic Inputs to Lake Mälaren, Sweden and Implications for Nutrient Loads
Öppna denna publikation i ny flik eller fönster >>Effects of Warmer World Scenarios on Hydrologic Inputs to Lake Mälaren, Sweden and Implications for Nutrient Loads
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2008 (Engelska)Ingår i: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 599, s. 191-199Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A simple, rapid, and flexible modelling approach was applied to explore the impacts of climate change on hydrologic inputs and consequent implications for nutrient loading to Lake Malaren, Sweden using a loading function model (GWLF). The first step in the process was to adapt the model for use in a large and complex Swedish catchment. We focused on the Galten basin with four rivers draining into the western region of Malaren. The catchment model was calibrated and tested using long-term historical data for river discharge and dissolved nutrients (N, P). Then multiple regional climate model simulation results were downscaled to the local catchment level, and used to simulate possible hydrological and nutrient loading responses to warmer world scenarios. Climate change projections for the rivers of Galten basin show profound changes in the timing of discharge and nutrient delivery due to increased winter precipitation and earlier snow melt. Impacts on total annual discharge and load are minimal, but the alteration in river flow regime and the timing of nutrient delivery for future climate scenarios is strikingly different from historical conditions.

Nyckelord
catchment modeling, hydrologic transport, nutrient loading, climate impact assessment
Nationell ämneskategori
Biologiska vetenskaper
Identifikatorer
urn:nbn:se:uu:diva-96263 (URN)10.1007/s10750-007-9197-8 (DOI)000252890800024 ()
Tillgänglig från: 2007-10-04 Skapad: 2007-10-04 Senast uppdaterad: 2022-01-28Bibliografiskt granskad
3. Lake phytoplankton response to a future climate scenario
Öppna denna publikation i ny flik eller fönster >>Lake phytoplankton response to a future climate scenario
Artikel i tidskrift (Refereegranskat) Submitted
Identifikatorer
urn:nbn:se:uu:diva-96264 (URN)
Tillgänglig från: 2007-10-04 Skapad: 2007-10-04Bibliografiskt granskad
4. Modelling the Effects of Climate Change on Inorganic Nitrogen Transport from Catchments to Lakes
Öppna denna publikation i ny flik eller fönster >>Modelling the Effects of Climate Change on Inorganic Nitrogen Transport from Catchments to Lakes
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Manuskript (Övrigt vetenskapligt)
Identifikatorer
urn:nbn:se:uu:diva-96265 (URN)
Tillgänglig från: 2007-10-04 Skapad: 2007-10-04 Senast uppdaterad: 2010-01-13Bibliografiskt granskad
5. High-frequency monitoring of colored dissolved organic matter (CDOM) fluorescence in the Swedish river Hedströmmen
Öppna denna publikation i ny flik eller fönster >>High-frequency monitoring of colored dissolved organic matter (CDOM) fluorescence in the Swedish river Hedströmmen
Manuskript (Övrigt vetenskapligt)
Identifikatorer
urn:nbn:se:uu:diva-96266 (URN)
Tillgänglig från: 2007-10-04 Skapad: 2007-10-04 Senast uppdaterad: 2014-01-16

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