Distribution and photoreactivity of chromophoric dissolved organic matter in the Antarctic Peninsula (Southern Ocean)
Chromophoric dissolved organic matter (CDOM) plays a key role regulating light attenuation in the ocean. This optically reactive pool of organic matter is driven by several physical and biological processes such as photobleaching, photohumification, and biogeneration, that act as primary sinks and s...
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ftinsu:oai:HAL:hal-00740163v1 2024-02-11T09:56:19+01:00 Distribution and photoreactivity of chromophoric dissolved organic matter in the Antarctic Peninsula (Southern Ocean) Ortega-Retuerta, E. Reche, I. Pulido-Villena, Elvira Agusti, S. Duarte, C. M. Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2010-02-28 https://hal.science/hal-00740163 https://doi.org/10.1016/j.marchem.2009.11.008 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2009.11.008 hal-00740163 https://hal.science/hal-00740163 doi:10.1016/j.marchem.2009.11.008 ISSN: 0304-4203 Marine Chemistry https://hal.science/hal-00740163 Marine Chemistry, 2010, 118 (3-4), pp.129-139. ⟨10.1016/j.marchem.2009.11.008⟩ Chromophoric Dissolved organic matter Photobleaching Photohumification Southern ocean [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2010 ftinsu https://doi.org/10.1016/j.marchem.2009.11.008 2024-01-24T17:23:28Z Chromophoric dissolved organic matter (CDOM) plays a key role regulating light attenuation in the ocean. This optically reactive pool of organic matter is driven by several physical and biological processes such as photobleaching, photohumification, and biogeneration, that act as primary sinks and sources of CDOM. In this study. we described the geographical and vertical distribution of CDOM in the Antarctic Peninsula area (Southern Ocean), and assessed its potential driving factors, with special emphasis on CDOM photo reactivity. CDOM values were between the detection limit and 2.17 m(-1) at 325 nm and between the detection limit and 0.76 m(-1) at 443 nm (average a(325) = 0.36 +/- 0.02 m(-1), average a(443) = 0-11 +/- 0.01 m(-1)). with the highest values inside Deception Island in 2004, and the lowest in the Eastern Bransfield Strait. In Bellingshausen Sea, CDOM was higher below the mixed layer suggesting a significant role of photobleaching. By contrast in the Weddell Sea maximum values were found within the mixed layer. In the Weddell Sea, a positive correlation between CDOM and both chlorophyll a and bacterial production and a negative correlation with salinity suggest a biological source of CDOM likely associated to ice melting. Salinity was also negatively related to the spectral slopes from 275 to 295 nm, considered a good proxy for DOM molecular weight. The experimental results demonstrate the photoreactive nature of CDOM, with half lives from 2.1 to 5.1 days due to photobleaching in the upper layer and duplication times from 4.9 to 15.7 days due to photohumification, that highlight the highly dynamic nature of CDOM in this area Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Bransfield Strait Deception Island Southern Ocean Weddell Sea Institut national des sciences de l'Univers: HAL-INSU Antarctic Antarctic Peninsula Bellingshausen Sea Bransfield Strait Deception Island ENVELOPE(-60.633,-60.633,-62.950,-62.950) Southern Ocean The Antarctic Weddell Weddell Sea Marine Chemistry 118 3-4 129 139 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Chromophoric Dissolved organic matter Photobleaching Photohumification Southern ocean [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Chromophoric Dissolved organic matter Photobleaching Photohumification Southern ocean [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Ortega-Retuerta, E. Reche, I. Pulido-Villena, Elvira Agusti, S. Duarte, C. M. Distribution and photoreactivity of chromophoric dissolved organic matter in the Antarctic Peninsula (Southern Ocean) |
topic_facet |
Chromophoric Dissolved organic matter Photobleaching Photohumification Southern ocean [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
Chromophoric dissolved organic matter (CDOM) plays a key role regulating light attenuation in the ocean. This optically reactive pool of organic matter is driven by several physical and biological processes such as photobleaching, photohumification, and biogeneration, that act as primary sinks and sources of CDOM. In this study. we described the geographical and vertical distribution of CDOM in the Antarctic Peninsula area (Southern Ocean), and assessed its potential driving factors, with special emphasis on CDOM photo reactivity. CDOM values were between the detection limit and 2.17 m(-1) at 325 nm and between the detection limit and 0.76 m(-1) at 443 nm (average a(325) = 0.36 +/- 0.02 m(-1), average a(443) = 0-11 +/- 0.01 m(-1)). with the highest values inside Deception Island in 2004, and the lowest in the Eastern Bransfield Strait. In Bellingshausen Sea, CDOM was higher below the mixed layer suggesting a significant role of photobleaching. By contrast in the Weddell Sea maximum values were found within the mixed layer. In the Weddell Sea, a positive correlation between CDOM and both chlorophyll a and bacterial production and a negative correlation with salinity suggest a biological source of CDOM likely associated to ice melting. Salinity was also negatively related to the spectral slopes from 275 to 295 nm, considered a good proxy for DOM molecular weight. The experimental results demonstrate the photoreactive nature of CDOM, with half lives from 2.1 to 5.1 days due to photobleaching in the upper layer and duplication times from 4.9 to 15.7 days due to photohumification, that highlight the highly dynamic nature of CDOM in this area |
author2 |
Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Ortega-Retuerta, E. Reche, I. Pulido-Villena, Elvira Agusti, S. Duarte, C. M. |
author_facet |
Ortega-Retuerta, E. Reche, I. Pulido-Villena, Elvira Agusti, S. Duarte, C. M. |
author_sort |
Ortega-Retuerta, E. |
title |
Distribution and photoreactivity of chromophoric dissolved organic matter in the Antarctic Peninsula (Southern Ocean) |
title_short |
Distribution and photoreactivity of chromophoric dissolved organic matter in the Antarctic Peninsula (Southern Ocean) |
title_full |
Distribution and photoreactivity of chromophoric dissolved organic matter in the Antarctic Peninsula (Southern Ocean) |
title_fullStr |
Distribution and photoreactivity of chromophoric dissolved organic matter in the Antarctic Peninsula (Southern Ocean) |
title_full_unstemmed |
Distribution and photoreactivity of chromophoric dissolved organic matter in the Antarctic Peninsula (Southern Ocean) |
title_sort |
distribution and photoreactivity of chromophoric dissolved organic matter in the antarctic peninsula (southern ocean) |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.science/hal-00740163 https://doi.org/10.1016/j.marchem.2009.11.008 |
long_lat |
ENVELOPE(-60.633,-60.633,-62.950,-62.950) |
geographic |
Antarctic Antarctic Peninsula Bellingshausen Sea Bransfield Strait Deception Island Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Bellingshausen Sea Bransfield Strait Deception Island Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Bransfield Strait Deception Island Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Bransfield Strait Deception Island Southern Ocean Weddell Sea |
op_source |
ISSN: 0304-4203 Marine Chemistry https://hal.science/hal-00740163 Marine Chemistry, 2010, 118 (3-4), pp.129-139. ⟨10.1016/j.marchem.2009.11.008⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2009.11.008 hal-00740163 https://hal.science/hal-00740163 doi:10.1016/j.marchem.2009.11.008 |
op_doi |
https://doi.org/10.1016/j.marchem.2009.11.008 |
container_title |
Marine Chemistry |
container_volume |
118 |
container_issue |
3-4 |
container_start_page |
129 |
op_container_end_page |
139 |
_version_ |
1790602175547703296 |