Distributions of low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls in the marine aerosols collected over the Arctic Ocean during late summer
Oxalic and other small dicarboxylic acids have been reported as important water-soluble organic constituents of atmospheric aerosols from different environments. Their molecular distributions are generally characterized by the predominance of oxalic acid (C 2 ) followed by malonic (C 3 ) and/or succ...
Published in: | Biogeosciences |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2012
|
Subjects: | |
Online Access: | https://doi.org/10.5194/bg-9-4725-2012 https://doaj.org/article/652fbecf56e947caa9498d750285189e |
id |
ftdoajarticles:oai:doaj.org/article:652fbecf56e947caa9498d750285189e |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:652fbecf56e947caa9498d750285189e 2023-05-15T13:38:39+02:00 Distributions of low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls in the marine aerosols collected over the Arctic Ocean during late summer K. Kawamura K. Ono E. Tachibana B. Charriére R. Sempéré 2012-11-01T00:00:00Z https://doi.org/10.5194/bg-9-4725-2012 https://doaj.org/article/652fbecf56e947caa9498d750285189e EN eng Copernicus Publications http://www.biogeosciences.net/9/4725/2012/bg-9-4725-2012.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-9-4725-2012 1726-4170 1726-4189 https://doaj.org/article/652fbecf56e947caa9498d750285189e Biogeosciences, Vol 9, Iss 11, Pp 4725-4737 (2012) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2012 ftdoajarticles https://doi.org/10.5194/bg-9-4725-2012 2022-12-31T16:26:26Z Oxalic and other small dicarboxylic acids have been reported as important water-soluble organic constituents of atmospheric aerosols from different environments. Their molecular distributions are generally characterized by the predominance of oxalic acid (C 2 ) followed by malonic (C 3 ) and/or succinic (C 4 ) acids. In this study, we collected marine aerosols from the Arctic Ocean during late summer in 2009 when sea ice was retreating. The marine aerosols were analyzed for the molecular distributions of dicarboxylic acids as well as ketocarboxylic acids and α-dicarbonyls to better understand the source of water-soluble organics and their photochemical processes in the high Arctic marine atmosphere. We found that diacids are more abundant than ketoacids and α-dicarbonyls, but their concentrations are generally low (< 30 ng m −3 ), except for one sample (up to 70 ng m −3 ) that was collected near the mouth of Mackenzie River during clear sky condition. Although the molecular compositions of diacids are in general characterized by the predominance of oxalic acid, a depletion of C 2 was found in two samples in which C 4 became the most abundant. Similar depletion of oxalic acid has previously been reported in the Arctic aerosols collected at Alert after polar sunrise and in the summer aerosols from the coast of Antarctica. Because the marine aerosols that showed a depletion of C 2 were collected under the overcast and/or foggy conditions, we suggest that a photochemical decomposition of oxalic acid may have occurred in aqueous phase of aerosols over the Arctic Ocean via the photo dissociation of oxalate-Fe (III) complex. We also determined stable carbon isotopic compositions (δ 13 C) of bulk aerosol carbon and individual diacids. The δ 13 C of bulk aerosols showed −26.5‰ (range: −29.7 to −24.7‰, suggesting that marine aerosol carbon is derived from both terrestrial and marine organic materials. In contrast, oxalic acid showed much larger δ 13 C values (average: −20.9‰, range: −24.7‰ to −17.0‰) than those of bulk ... Article in Journal/Newspaper Antarc* Antarctica Arctic Arctic Ocean Mackenzie river Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Mackenzie River Biogeosciences 9 11 4725 4737 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 K. Kawamura K. Ono E. Tachibana B. Charriére R. Sempéré Distributions of low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls in the marine aerosols collected over the Arctic Ocean during late summer |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Oxalic and other small dicarboxylic acids have been reported as important water-soluble organic constituents of atmospheric aerosols from different environments. Their molecular distributions are generally characterized by the predominance of oxalic acid (C 2 ) followed by malonic (C 3 ) and/or succinic (C 4 ) acids. In this study, we collected marine aerosols from the Arctic Ocean during late summer in 2009 when sea ice was retreating. The marine aerosols were analyzed for the molecular distributions of dicarboxylic acids as well as ketocarboxylic acids and α-dicarbonyls to better understand the source of water-soluble organics and their photochemical processes in the high Arctic marine atmosphere. We found that diacids are more abundant than ketoacids and α-dicarbonyls, but their concentrations are generally low (< 30 ng m −3 ), except for one sample (up to 70 ng m −3 ) that was collected near the mouth of Mackenzie River during clear sky condition. Although the molecular compositions of diacids are in general characterized by the predominance of oxalic acid, a depletion of C 2 was found in two samples in which C 4 became the most abundant. Similar depletion of oxalic acid has previously been reported in the Arctic aerosols collected at Alert after polar sunrise and in the summer aerosols from the coast of Antarctica. Because the marine aerosols that showed a depletion of C 2 were collected under the overcast and/or foggy conditions, we suggest that a photochemical decomposition of oxalic acid may have occurred in aqueous phase of aerosols over the Arctic Ocean via the photo dissociation of oxalate-Fe (III) complex. We also determined stable carbon isotopic compositions (δ 13 C) of bulk aerosol carbon and individual diacids. The δ 13 C of bulk aerosols showed −26.5‰ (range: −29.7 to −24.7‰, suggesting that marine aerosol carbon is derived from both terrestrial and marine organic materials. In contrast, oxalic acid showed much larger δ 13 C values (average: −20.9‰, range: −24.7‰ to −17.0‰) than those of bulk ... |
format |
Article in Journal/Newspaper |
author |
K. Kawamura K. Ono E. Tachibana B. Charriére R. Sempéré |
author_facet |
K. Kawamura K. Ono E. Tachibana B. Charriére R. Sempéré |
author_sort |
K. Kawamura |
title |
Distributions of low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls in the marine aerosols collected over the Arctic Ocean during late summer |
title_short |
Distributions of low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls in the marine aerosols collected over the Arctic Ocean during late summer |
title_full |
Distributions of low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls in the marine aerosols collected over the Arctic Ocean during late summer |
title_fullStr |
Distributions of low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls in the marine aerosols collected over the Arctic Ocean during late summer |
title_full_unstemmed |
Distributions of low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls in the marine aerosols collected over the Arctic Ocean during late summer |
title_sort |
distributions of low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls in the marine aerosols collected over the arctic ocean during late summer |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/bg-9-4725-2012 https://doaj.org/article/652fbecf56e947caa9498d750285189e |
geographic |
Arctic Arctic Ocean Mackenzie River |
geographic_facet |
Arctic Arctic Ocean Mackenzie River |
genre |
Antarc* Antarctica Arctic Arctic Ocean Mackenzie river Sea ice |
genre_facet |
Antarc* Antarctica Arctic Arctic Ocean Mackenzie river Sea ice |
op_source |
Biogeosciences, Vol 9, Iss 11, Pp 4725-4737 (2012) |
op_relation |
http://www.biogeosciences.net/9/4725/2012/bg-9-4725-2012.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-9-4725-2012 1726-4170 1726-4189 https://doaj.org/article/652fbecf56e947caa9498d750285189e |
op_doi |
https://doi.org/10.5194/bg-9-4725-2012 |
container_title |
Biogeosciences |
container_volume |
9 |
container_issue |
11 |
container_start_page |
4725 |
op_container_end_page |
4737 |
_version_ |
1766109188548722688 |