Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Simulating Transport and Understanding Future Fluxes of Organic Carbon in Rivers Draining into the Baltic Sea
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.ORCID-id: 0000-0001-7811-8453
2017 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Riverine organic (TOC, Total Organic Carbon) and inorganic (DIC, Dissolved Inorganic Carbon) carbon are the main sources of carbon in the Baltic Sea. While the importance of this contribution has been evaluated, there are currently several gaps in our knowledge of the mechanisms governing organic carbon dynamics in this region, especially for the particulate form, and the impact of future climate change on organic carbon transport. This licentiate thesis addresses this research deficit by (1) developing a model for assessing the flux of particulate organic carbon (POC), and by (2) simulating the potential climate effects on the transport and fate of TOC, both particulate and dissolved organic carbon, in the Baltic Sea environment.

Study I developed a novel dynamic model for simulating the generation and transport of POC in all the major rivers discharging into the Baltic Sea. The POC load was assessed using algorithms for the processes governing the input i.e. erosion, litterfall and in-stream primary production. Using daily information on precipitation and temperature, the water discharge from each river was calculated. The total annual POC load from the Baltic Sea drainage basin was predicted within a factor of about 2 and was estimated to be 0.34 Tg POC, or 7-10 % of the annual TOC. The prediction of the timing of the monthly peak loads, however, was hampered by the current lack of field measurements of POC loads to the Baltic Sea.

Study II assessed the potential future climate effects on riverine TOC (particulate and dissolved organic carbon, DOC) in the Baltic Sea drainage basin. A small decrease in POC load (-7 %) was predicted and no changes in DOC load on an annual and total basin scale, but the simulations showed significant variations between seasons and across sub-basins by the end of this century. Seasonal total loads were predicted to increase in winter and decrease in summer. Due to counterbalancing increases and decreases in predicted TOC loads in various parts of the Baltic Sea catchment, the impact of climate change on the total carbon budget in this region was limited. However, our simulation results indicated significant differences over time in POC and DOC export across the six Baltic Sea sub-basins, and an altered seasonal pattern in the timing and magnitude of the delivery.

This thesis comprises a first attempt to better describe the mechanisms and dynamics of OC generation and transport in the Baltic Sea catchment and assess the potential climate effects on the transport with a spatiotemporal resolution. The work provides a starting point for further development of the understanding of large scale organic carbon export and how it may be affected in the future. This thesis also discuss the role of riverine organic carbon in biogeochemical processes, food web structures and contaminant transport in inland, coastal and marine waters.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Environmental Science and Analytical Chemistry, Stockholm University , 2017. , s. 19
Nationell ämneskategori
Miljövetenskap
Identifikatorer
URN: urn:nbn:se:su:diva-141347OAI: oai:DiVA.org:su-141347DiVA, id: diva2:1086760
Presentation
2017-04-18, Nordenskiöldsalen, Svante Arrhenius väg 12, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2017-04-06 Skapad: 2017-04-04 Senast uppdaterad: 2017-04-06Bibliografiskt granskad
Delarbeten
1. Modeling total particulate organic carbon (POC) flows in the Baltic Sea catchment
Öppna denna publikation i ny flik eller fönster >>Modeling total particulate organic carbon (POC) flows in the Baltic Sea catchment
Visa övriga...
2016 (Engelska)Ingår i: Biogeochemistry, ISSN 0168-2563, E-ISSN 1573-515X, Vol. 128, nr 1-2, s. 51-65Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The largest input source of carbon to the Baltic Sea catchment is river discharge. A tool for modeling riverine particulate organic carbon (POC) loads on a catchment scale is currently lacking. The present study describes a novel dynamic model for simulating flows of POC in all major rivers draining the Baltic Sea catchment. The processes governing POC input and transport in rivers described in the model are soil erosion, in-stream primary production and litter input. The Baltic Sea drainage basin is divided into 82 sub-basins, each comprising several land classes (e.g. forest, cultivated land, urban areas) and parameterized using GIS data on soil characteristics and topography. Driving forces are temperature, precipitation, and total phosphorous concentrations. The model evaluation shows that the model can predict annual average POC concentrations within a factor of about 2, but generally fails to capture the timing of monthly peak loads. The total annual POC load to the Baltic Sea is estimated to be 0.34 Tg POC, which constitutes circa 7-10 % of the annual total organic carbon (TOC) load. The current lack of field measurements of POC in rivers hampers more accurate predictions of seasonality in POC loads to the Baltic Sea. This study, however, identifies important knowledge gaps and provides a starting point for further explorations of large scale POC mass flows.

Nyckelord
Soil erosion, Litter, Large-scale model, Organic carbon, Primary production, Drainage basin
Nationell ämneskategori
Geovetenskap och miljövetenskap
Identifikatorer
urn:nbn:se:su:diva-130971 (URN)10.1007/s10533-016-0194-8 (DOI)000374557300004 ()
Tillgänglig från: 2016-06-14 Skapad: 2016-06-09 Senast uppdaterad: 2019-12-04Bibliografiskt granskad

Open Access i DiVA

fulltext(1569 kB)80 nedladdningar
Filinformation
Filnamn FULLTEXT02.pdfFilstorlek 1569 kBChecksumma SHA-512
939330d174d4838a9c01a8812d1bad899835cbcac12c871db48979411c1c1ae80f6776fc7bc565c8c252df8cf33bef931322ac849f095687b18d4e5bb8701522
Typ fulltextMimetyp application/pdf

Sök vidare i DiVA

Av författaren/redaktören
Dahlgren Strååt, Kim
Av organisationen
Institutionen för miljövetenskap och analytisk kemi
Miljövetenskap

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 80 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

urn-nbn

Altmetricpoäng

urn-nbn
Totalt: 293 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf