Marine CDOM accumulation during a coastal arctic mesocosm experiment: no response to elevated pCO2 levels
A large-scale multidisciplinary mesocosm experiment in an Arctic fjord (Kongsfjorden, Svalbard; 78°56.2′N) was used to study Arctic marine food webs and biogeochemical elements cycling at natural and elevated future carbon dioxide (CO2) levels. At the start of the experiment, marine-derived chromoph...
Published in: | Journal of Geophysical Research: Biogeosciences |
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Online Access: | https://epubs.scu.edu.au/esm_pubs/2894 https://doi.org/10.1002/2013JG002587 |
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ftsoutherncu:oai:epubs.scu.edu.au:esm_pubs-3911 2023-05-15T14:40:04+02:00 Marine CDOM accumulation during a coastal arctic mesocosm experiment: no response to elevated pCO2 levels Pavlov, Alexey K Silyakova, Ann Granskog, Mats A Bellerby, Richard GJ Engel, Anja Schulz, Kai G Brussaard, Corina PD 2014-01-01T08:00:00Z https://epubs.scu.edu.au/esm_pubs/2894 https://doi.org/10.1002/2013JG002587 unknown ePublications@SCU School of Environment, Science and Engineering Papers Arctic Ocean; Svalbard; absorption coefficient; chromophoric dissolved organic matter; spectral slope coefficient; mycosporine-like amino acids Environmental Sciences article 2014 ftsoutherncu https://doi.org/10.1002/2013JG002587 2019-08-06T13:11:21Z A large-scale multidisciplinary mesocosm experiment in an Arctic fjord (Kongsfjorden, Svalbard; 78°56.2′N) was used to study Arctic marine food webs and biogeochemical elements cycling at natural and elevated future carbon dioxide (CO2) levels. At the start of the experiment, marine-derived chromophoric dissolved organic matter (CDOM) dominated the CDOM pool. Thus, this experiment constituted a convenient case to study production of autochthonous CDOM, which is typically masked by high levels of CDOM of terrestrial origin in the Arctic Ocean proper. CDOM accumulated during the experiment in line with an increase in bacterial abundance; however, no response was observed to increased pCO2 levels. Changes in CDOM absorption spectral slopes indicate that bacteria were most likely responsible for the observed CDOM dynamics. Distinct absorption peaks (at ~ 330 and ~ 360 nm) were likely associated with mycosporine-like amino acids (MAAs). Due to the experimental setup, MAAs were produced in absence of ultraviolet exposure providing evidence for MAAs to be considered as multipurpose metabolites rather than simple photoprotective compounds. We showed that a small increase in CDOM during the experiment made it a major contributor to total absorption in a range of photosynthetically active radiation (PAR, 400–700 nm) and, therefore, is important for spectral light availability and may be important for photosynthesis and phytoplankton groups composition in a rapidly changing Arctic marine ecosystem. Article in Journal/Newspaper Arctic Arctic Ocean Kongsfjord* Kongsfjorden Phytoplankton Svalbard Southern Cross University: epublications@SCU Arctic Arctic Ocean Svalbard Journal of Geophysical Research: Biogeosciences 119 6 1216 1230 |
institution |
Open Polar |
collection |
Southern Cross University: epublications@SCU |
op_collection_id |
ftsoutherncu |
language |
unknown |
topic |
Arctic Ocean; Svalbard; absorption coefficient; chromophoric dissolved organic matter; spectral slope coefficient; mycosporine-like amino acids Environmental Sciences |
spellingShingle |
Arctic Ocean; Svalbard; absorption coefficient; chromophoric dissolved organic matter; spectral slope coefficient; mycosporine-like amino acids Environmental Sciences Pavlov, Alexey K Silyakova, Ann Granskog, Mats A Bellerby, Richard GJ Engel, Anja Schulz, Kai G Brussaard, Corina PD Marine CDOM accumulation during a coastal arctic mesocosm experiment: no response to elevated pCO2 levels |
topic_facet |
Arctic Ocean; Svalbard; absorption coefficient; chromophoric dissolved organic matter; spectral slope coefficient; mycosporine-like amino acids Environmental Sciences |
description |
A large-scale multidisciplinary mesocosm experiment in an Arctic fjord (Kongsfjorden, Svalbard; 78°56.2′N) was used to study Arctic marine food webs and biogeochemical elements cycling at natural and elevated future carbon dioxide (CO2) levels. At the start of the experiment, marine-derived chromophoric dissolved organic matter (CDOM) dominated the CDOM pool. Thus, this experiment constituted a convenient case to study production of autochthonous CDOM, which is typically masked by high levels of CDOM of terrestrial origin in the Arctic Ocean proper. CDOM accumulated during the experiment in line with an increase in bacterial abundance; however, no response was observed to increased pCO2 levels. Changes in CDOM absorption spectral slopes indicate that bacteria were most likely responsible for the observed CDOM dynamics. Distinct absorption peaks (at ~ 330 and ~ 360 nm) were likely associated with mycosporine-like amino acids (MAAs). Due to the experimental setup, MAAs were produced in absence of ultraviolet exposure providing evidence for MAAs to be considered as multipurpose metabolites rather than simple photoprotective compounds. We showed that a small increase in CDOM during the experiment made it a major contributor to total absorption in a range of photosynthetically active radiation (PAR, 400–700 nm) and, therefore, is important for spectral light availability and may be important for photosynthesis and phytoplankton groups composition in a rapidly changing Arctic marine ecosystem. |
format |
Article in Journal/Newspaper |
author |
Pavlov, Alexey K Silyakova, Ann Granskog, Mats A Bellerby, Richard GJ Engel, Anja Schulz, Kai G Brussaard, Corina PD |
author_facet |
Pavlov, Alexey K Silyakova, Ann Granskog, Mats A Bellerby, Richard GJ Engel, Anja Schulz, Kai G Brussaard, Corina PD |
author_sort |
Pavlov, Alexey K |
title |
Marine CDOM accumulation during a coastal arctic mesocosm experiment: no response to elevated pCO2 levels |
title_short |
Marine CDOM accumulation during a coastal arctic mesocosm experiment: no response to elevated pCO2 levels |
title_full |
Marine CDOM accumulation during a coastal arctic mesocosm experiment: no response to elevated pCO2 levels |
title_fullStr |
Marine CDOM accumulation during a coastal arctic mesocosm experiment: no response to elevated pCO2 levels |
title_full_unstemmed |
Marine CDOM accumulation during a coastal arctic mesocosm experiment: no response to elevated pCO2 levels |
title_sort |
marine cdom accumulation during a coastal arctic mesocosm experiment: no response to elevated pco2 levels |
publisher |
ePublications@SCU |
publishDate |
2014 |
url |
https://epubs.scu.edu.au/esm_pubs/2894 https://doi.org/10.1002/2013JG002587 |
geographic |
Arctic Arctic Ocean Svalbard |
geographic_facet |
Arctic Arctic Ocean Svalbard |
genre |
Arctic Arctic Ocean Kongsfjord* Kongsfjorden Phytoplankton Svalbard |
genre_facet |
Arctic Arctic Ocean Kongsfjord* Kongsfjorden Phytoplankton Svalbard |
op_source |
School of Environment, Science and Engineering Papers |
op_doi |
https://doi.org/10.1002/2013JG002587 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
119 |
container_issue |
6 |
container_start_page |
1216 |
op_container_end_page |
1230 |
_version_ |
1766311997277732864 |