In situ biodegradation, photooxidation and dissolution of petroleum compounds in Arctic seawater and sea ice
In pristine sea ice-covered Arctic waters the potential of natural attenuation of oil spills has yet to be uncovered, but increasing shipping and oil exploitation may bring along unprecedented risks of oil spills. We deployed adsorbents coated with thin oil films for up to 2.5 month in ice-covered s...
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Online Access: | https://pure.au.dk/portal/en/publications/3407c92d-5259-40ab-b4ba-9c2084571f3d https://doi.org/10.1016/j.watres.2018.10.066 |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/3407c92d-5259-40ab-b4ba-9c2084571f3d 2024-02-11T09:57:28+01:00 In situ biodegradation, photooxidation and dissolution of petroleum compounds in Arctic seawater and sea ice Vergeynst, Leendert Christensen, Jan H. Kjeldsen, Kasper Urup Meire, Lorenz Boone, Wieter Malmquist, Linus M.V. Rysgaard, Søren 2019 https://pure.au.dk/portal/en/publications/3407c92d-5259-40ab-b4ba-9c2084571f3d https://doi.org/10.1016/j.watres.2018.10.066 eng eng https://pure.au.dk/portal/en/publications/3407c92d-5259-40ab-b4ba-9c2084571f3d info:eu-repo/semantics/closedAccess Vergeynst , L , Christensen , J H , Kjeldsen , K U , Meire , L , Boone , W , Malmquist , L M V & Rysgaard , S 2019 , ' In situ biodegradation, photooxidation and dissolution of petroleum compounds in Arctic seawater and sea ice ' , Water Research , vol. 148 , pp. 459-468 . https://doi.org/10.1016/j.watres.2018.10.066 Bacterial community Sea ice Biodegradation Photooxidation Arctic Oil spill article 2019 ftuniaarhuspubl https://doi.org/10.1016/j.watres.2018.10.066 2024-01-18T00:00:00Z In pristine sea ice-covered Arctic waters the potential of natural attenuation of oil spills has yet to be uncovered, but increasing shipping and oil exploitation may bring along unprecedented risks of oil spills. We deployed adsorbents coated with thin oil films for up to 2.5 month in ice-covered seawater and sea ice in Godthaab Fjord, SW Greenland, to simulate and investigate in situ biodegradation and photooxidation of dispersed oil. GC-MS-based chemometric methods for oil fingerprinting were used to identify characteristic signatures for dissolution, biodegradation and photooxidation. In sub-zero temperature seawater, fast degradation of n-alkanes was observed with estimated half-life times of ∼7 days. PCR amplicon sequencing and qPCR quantification of bacterial genes showed that a biofilm with a diverse microbial community colonised the oil films, yet a population related to the psychrophilic hydrocarbonoclastic gammaproteobacterium Oleispira antarctica seemed to play a key role in n-alkane degradation. Although Oleispira populations were also present in sea ice, we found that biofilms in sea ice had 25 to 100 times lower bacterial densities than in seawater, which explained the non-detectable n-alkane degradation in sea ice. Fingerprinting revealed that photooxidation, but not biodegradation, transformed polycyclic aromatic compounds through 50 cm-thick sea ice and in the upper water column with removal rates up to ∼1% per day. Overall, our results showed a fast biodegradation of n-alkanes in sea ice-covered seawater, but suggested that oils spills will expose the Arctic ecosystem to bio-recalcitrant PACs over prolonged periods of time. Article in Journal/Newspaper Antarc* Antarctica Arctic Arctic Greenland Sea ice Aarhus University: Research Arctic Greenland Water Research 148 459 468 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Bacterial community Sea ice Biodegradation Photooxidation Arctic Oil spill |
spellingShingle |
Bacterial community Sea ice Biodegradation Photooxidation Arctic Oil spill Vergeynst, Leendert Christensen, Jan H. Kjeldsen, Kasper Urup Meire, Lorenz Boone, Wieter Malmquist, Linus M.V. Rysgaard, Søren In situ biodegradation, photooxidation and dissolution of petroleum compounds in Arctic seawater and sea ice |
topic_facet |
Bacterial community Sea ice Biodegradation Photooxidation Arctic Oil spill |
description |
In pristine sea ice-covered Arctic waters the potential of natural attenuation of oil spills has yet to be uncovered, but increasing shipping and oil exploitation may bring along unprecedented risks of oil spills. We deployed adsorbents coated with thin oil films for up to 2.5 month in ice-covered seawater and sea ice in Godthaab Fjord, SW Greenland, to simulate and investigate in situ biodegradation and photooxidation of dispersed oil. GC-MS-based chemometric methods for oil fingerprinting were used to identify characteristic signatures for dissolution, biodegradation and photooxidation. In sub-zero temperature seawater, fast degradation of n-alkanes was observed with estimated half-life times of ∼7 days. PCR amplicon sequencing and qPCR quantification of bacterial genes showed that a biofilm with a diverse microbial community colonised the oil films, yet a population related to the psychrophilic hydrocarbonoclastic gammaproteobacterium Oleispira antarctica seemed to play a key role in n-alkane degradation. Although Oleispira populations were also present in sea ice, we found that biofilms in sea ice had 25 to 100 times lower bacterial densities than in seawater, which explained the non-detectable n-alkane degradation in sea ice. Fingerprinting revealed that photooxidation, but not biodegradation, transformed polycyclic aromatic compounds through 50 cm-thick sea ice and in the upper water column with removal rates up to ∼1% per day. Overall, our results showed a fast biodegradation of n-alkanes in sea ice-covered seawater, but suggested that oils spills will expose the Arctic ecosystem to bio-recalcitrant PACs over prolonged periods of time. |
format |
Article in Journal/Newspaper |
author |
Vergeynst, Leendert Christensen, Jan H. Kjeldsen, Kasper Urup Meire, Lorenz Boone, Wieter Malmquist, Linus M.V. Rysgaard, Søren |
author_facet |
Vergeynst, Leendert Christensen, Jan H. Kjeldsen, Kasper Urup Meire, Lorenz Boone, Wieter Malmquist, Linus M.V. Rysgaard, Søren |
author_sort |
Vergeynst, Leendert |
title |
In situ biodegradation, photooxidation and dissolution of petroleum compounds in Arctic seawater and sea ice |
title_short |
In situ biodegradation, photooxidation and dissolution of petroleum compounds in Arctic seawater and sea ice |
title_full |
In situ biodegradation, photooxidation and dissolution of petroleum compounds in Arctic seawater and sea ice |
title_fullStr |
In situ biodegradation, photooxidation and dissolution of petroleum compounds in Arctic seawater and sea ice |
title_full_unstemmed |
In situ biodegradation, photooxidation and dissolution of petroleum compounds in Arctic seawater and sea ice |
title_sort |
in situ biodegradation, photooxidation and dissolution of petroleum compounds in arctic seawater and sea ice |
publishDate |
2019 |
url |
https://pure.au.dk/portal/en/publications/3407c92d-5259-40ab-b4ba-9c2084571f3d https://doi.org/10.1016/j.watres.2018.10.066 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Antarc* Antarctica Arctic Arctic Greenland Sea ice |
genre_facet |
Antarc* Antarctica Arctic Arctic Greenland Sea ice |
op_source |
Vergeynst , L , Christensen , J H , Kjeldsen , K U , Meire , L , Boone , W , Malmquist , L M V & Rysgaard , S 2019 , ' In situ biodegradation, photooxidation and dissolution of petroleum compounds in Arctic seawater and sea ice ' , Water Research , vol. 148 , pp. 459-468 . https://doi.org/10.1016/j.watres.2018.10.066 |
op_relation |
https://pure.au.dk/portal/en/publications/3407c92d-5259-40ab-b4ba-9c2084571f3d |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.watres.2018.10.066 |
container_title |
Water Research |
container_volume |
148 |
container_start_page |
459 |
op_container_end_page |
468 |
_version_ |
1790609757060464640 |