Lipid concentrations, UV radiation doses, and attenuation coefficients in coastal surface waters of West Antarctica
The seasonal depletion of stratospheric ozone over the Southern Hemisphere allows abnormally high doses of ultraviolet radiation (UVR) to reach surface waters of the West Antarctic Peninsula (WAP) in the austral spring, creating a natural laboratory for the study of lipid photooxidation in the shall...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.879582 2023-05-15T13:44:47+02:00 Lipid concentrations, UV radiation doses, and attenuation coefficients in coastal surface waters of West Antarctica Collins, James R Marchetti, Adrian Ducklow, Hugh W Van Mooy, Benjamin A S MEDIAN LATITUDE: -65.032595 * MEDIAN LONGITUDE: -64.590128 * SOUTH-BOUND LATITUDE: -68.158630 * WEST-BOUND LONGITUDE: -68.946490 * NORTH-BOUND LATITUDE: -63.964970 * EAST-BOUND LONGITUDE: -64.041700 * DATE/TIME START: 2013-10-21T00:00:00 * DATE/TIME END: 2014-01-16T19:42:00 2017-08-14 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.879582 https://doi.org/10.1594/PANGAEA.879582 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.879582 https://doi.org/10.1594/PANGAEA.879582 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Collins, James R; Fredricks, Helen F; Bowman, Jeff S; Ward, Collin P; Moreno, Carly; Longnecker, Krista; Marchetti, Adrian; Hansel, Colleen M; Ducklow, Hugh W; Van Mooy, Benjamin A S (2018): The molecular products and biogeochemical significance of lipid photooxidation in West Antarctic surface waters. Geochimica et Cosmochimica Acta, 232, 244-264, https://doi.org/10.1016/j.gca.2018.04.030 Dataset 2017 ftpangaea https://doi.org/10.1594/PANGAEA.879582 https://doi.org/10.1016/j.gca.2018.04.030 2023-01-20T07:34:00Z The seasonal depletion of stratospheric ozone over the Southern Hemisphere allows abnormally high doses of ultraviolet radiation (UVR) to reach surface waters of the West Antarctic Peninsula (WAP) in the austral spring, creating a natural laboratory for the study of lipid photooxidation in the shallow mixed layer of the marginal ice zone. The photooxidation of lipids under such conditions has been identified as a significant source of stress to microorganisms, and short-chain fatty acids altered by photochemical processes have been found in both marine aerosols and sinking marine particle material. However, the biogeochemical impact of lipid photooxidation has not been quantitatively compared at ecosystem scale to the many other biological and abiotic processes that can transform particulate organic matter in the surface ocean. We combined results from field experiments with diverse environmental data, including high-resolution, accurate-mass HPLC-ESI-MS analysis of lipid extracts and in situ measurements of ultraviolet irradiance, to address several unresolved questions about lipid photooxidation in the marine environment. In our experiments, we used liposomes - nonliving, cell-like aggregations of lipids - to examine the photolability of various moieties of the intact polar diacylglycerol (IP-DAG) phosphatidylcholine (PC), a structural component of membranes in a broad range of microorganisms. We observed significant rates of photooxidation only when the molecule contained the polyunsaturated fatty acid (PUFA) docosahexaenoic acid (DHA). As the DHA-containing lipid was oxidized, we observed the steady ingrowth of a diversity of oxylipins and oxidized IP-DAG; our results suggest both the intact IP-DAG the degradation products were amenable to heterotrophic assimilation. To complement our experiments, we used an enhanced version of a new lipidomics discovery software package to identify the lipids in water column samples and in several diatom isolates. The galactolipid digalactosyldiacylglycerol (DGDG), the ... Dataset Antarc* Antarctic Antarctic Peninsula Antarctica West Antarctica PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Antarctic Peninsula Austral West Antarctica ENVELOPE(-68.946490,-64.041700,-63.964970,-68.158630) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
The seasonal depletion of stratospheric ozone over the Southern Hemisphere allows abnormally high doses of ultraviolet radiation (UVR) to reach surface waters of the West Antarctic Peninsula (WAP) in the austral spring, creating a natural laboratory for the study of lipid photooxidation in the shallow mixed layer of the marginal ice zone. The photooxidation of lipids under such conditions has been identified as a significant source of stress to microorganisms, and short-chain fatty acids altered by photochemical processes have been found in both marine aerosols and sinking marine particle material. However, the biogeochemical impact of lipid photooxidation has not been quantitatively compared at ecosystem scale to the many other biological and abiotic processes that can transform particulate organic matter in the surface ocean. We combined results from field experiments with diverse environmental data, including high-resolution, accurate-mass HPLC-ESI-MS analysis of lipid extracts and in situ measurements of ultraviolet irradiance, to address several unresolved questions about lipid photooxidation in the marine environment. In our experiments, we used liposomes - nonliving, cell-like aggregations of lipids - to examine the photolability of various moieties of the intact polar diacylglycerol (IP-DAG) phosphatidylcholine (PC), a structural component of membranes in a broad range of microorganisms. We observed significant rates of photooxidation only when the molecule contained the polyunsaturated fatty acid (PUFA) docosahexaenoic acid (DHA). As the DHA-containing lipid was oxidized, we observed the steady ingrowth of a diversity of oxylipins and oxidized IP-DAG; our results suggest both the intact IP-DAG the degradation products were amenable to heterotrophic assimilation. To complement our experiments, we used an enhanced version of a new lipidomics discovery software package to identify the lipids in water column samples and in several diatom isolates. The galactolipid digalactosyldiacylglycerol (DGDG), the ... |
format |
Dataset |
author |
Collins, James R Marchetti, Adrian Ducklow, Hugh W Van Mooy, Benjamin A S |
spellingShingle |
Collins, James R Marchetti, Adrian Ducklow, Hugh W Van Mooy, Benjamin A S Lipid concentrations, UV radiation doses, and attenuation coefficients in coastal surface waters of West Antarctica |
author_facet |
Collins, James R Marchetti, Adrian Ducklow, Hugh W Van Mooy, Benjamin A S |
author_sort |
Collins, James R |
title |
Lipid concentrations, UV radiation doses, and attenuation coefficients in coastal surface waters of West Antarctica |
title_short |
Lipid concentrations, UV radiation doses, and attenuation coefficients in coastal surface waters of West Antarctica |
title_full |
Lipid concentrations, UV radiation doses, and attenuation coefficients in coastal surface waters of West Antarctica |
title_fullStr |
Lipid concentrations, UV radiation doses, and attenuation coefficients in coastal surface waters of West Antarctica |
title_full_unstemmed |
Lipid concentrations, UV radiation doses, and attenuation coefficients in coastal surface waters of West Antarctica |
title_sort |
lipid concentrations, uv radiation doses, and attenuation coefficients in coastal surface waters of west antarctica |
publisher |
PANGAEA |
publishDate |
2017 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.879582 https://doi.org/10.1594/PANGAEA.879582 |
op_coverage |
MEDIAN LATITUDE: -65.032595 * MEDIAN LONGITUDE: -64.590128 * SOUTH-BOUND LATITUDE: -68.158630 * WEST-BOUND LONGITUDE: -68.946490 * NORTH-BOUND LATITUDE: -63.964970 * EAST-BOUND LONGITUDE: -64.041700 * DATE/TIME START: 2013-10-21T00:00:00 * DATE/TIME END: 2014-01-16T19:42:00 |
long_lat |
ENVELOPE(-68.946490,-64.041700,-63.964970,-68.158630) |
geographic |
Antarctic Antarctic Peninsula Austral West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula Austral West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica West Antarctica |
op_source |
Supplement to: Collins, James R; Fredricks, Helen F; Bowman, Jeff S; Ward, Collin P; Moreno, Carly; Longnecker, Krista; Marchetti, Adrian; Hansel, Colleen M; Ducklow, Hugh W; Van Mooy, Benjamin A S (2018): The molecular products and biogeochemical significance of lipid photooxidation in West Antarctic surface waters. Geochimica et Cosmochimica Acta, 232, 244-264, https://doi.org/10.1016/j.gca.2018.04.030 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.879582 https://doi.org/10.1594/PANGAEA.879582 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.879582 https://doi.org/10.1016/j.gca.2018.04.030 |
_version_ |
1766206589844324352 |