UV/PAR radiation and DOM properties in surface coastal waters of the Canadian shelf of the Beaufort Sea during summer 2009
Surface waters from the Beaufort Sea in the Arctic Ocean were evaluated for dissolved organic carbon (DOC), and optical characteristics including UV (ultraviolet) radiation and PAR (photosynthetically active radiation) diffuse attenuation ( K d ), and chromophoric and fluorescent dissolved organic m...
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ftdoajarticles:oai:doaj.org/article:fbf42dd87dba4dfc8d19e94412b34f10 2023-05-15T15:13:01+02:00 UV/PAR radiation and DOM properties in surface coastal waters of the Canadian shelf of the Beaufort Sea during summer 2009 J. Para B. Charrière A. Matsuoka W. L. Miller J. F. Rontani R. Sempéré 2013-04-01T00:00:00Z https://doi.org/10.5194/bg-10-2761-2013 https://doaj.org/article/fbf42dd87dba4dfc8d19e94412b34f10 EN eng Copernicus Publications http://www.biogeosciences.net/10/2761/2013/bg-10-2761-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-2761-2013 1726-4170 1726-4189 https://doaj.org/article/fbf42dd87dba4dfc8d19e94412b34f10 Biogeosciences, Vol 10, Iss 4, Pp 2761-2774 (2013) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/bg-10-2761-2013 2022-12-30T22:29:09Z Surface waters from the Beaufort Sea in the Arctic Ocean were evaluated for dissolved organic carbon (DOC), and optical characteristics including UV (ultraviolet) radiation and PAR (photosynthetically active radiation) diffuse attenuation ( K d ), and chromophoric and fluorescent dissolved organic matter (CDOM and FDOM) as part of the MALINA field campaign (30 July to 27 August). Spectral absorption coefficients ( a CDOM (350 nm) (m −1 )) were significantly correlated to both diffuse attenuation coefficients ( K d ) in the UV-A and UV-B and to DOC concentrations. This indicates CDOM as the dominant attenuator of both UV and PAR solar radiation and suggests its use as an optical proxy for DOC concentrations in this region. While the Mackenzie input is the main driver of CDOM dynamics in low salinity waters, locally, primary production can create significant increases in CDOM. Extrapolating CDOM to DOC relationships, we estimate that ∼16% of the DOC in the Mackenzie River does not absorb radiation at 350 nm. The discharges of DOC and its chromophoric subset (CDOM) by the Mackenzie River during the MALINA cruise are estimated as ∼0.22 TgC and 0.18 TgC, respectively. Three dissolved fluorescent components (C1–C3) were identified by fluorescence excitation/emission matrix spectroscopy (EEMS) and parallel factor (PARAFAC) analysis. Our results showed an aquatic dissolved organic matter (DOM) component (C1), probably produced in the numerous lakes of the watershed, that co-dominated with a terrestrial humic-like component (C2) in the Mackenzie Delta Sector. This aquatic DOM could partially explain the high CDOM spectral slopes observed in the Beaufort Sea. Article in Journal/Newspaper Arctic Arctic Ocean Beaufort Sea Mackenzie Delta Mackenzie river Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Mackenzie River Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Biogeosciences 10 4 2761 2774 |
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 J. Para B. Charrière A. Matsuoka W. L. Miller J. F. Rontani R. Sempéré UV/PAR radiation and DOM properties in surface coastal waters of the Canadian shelf of the Beaufort Sea during summer 2009 |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Surface waters from the Beaufort Sea in the Arctic Ocean were evaluated for dissolved organic carbon (DOC), and optical characteristics including UV (ultraviolet) radiation and PAR (photosynthetically active radiation) diffuse attenuation ( K d ), and chromophoric and fluorescent dissolved organic matter (CDOM and FDOM) as part of the MALINA field campaign (30 July to 27 August). Spectral absorption coefficients ( a CDOM (350 nm) (m −1 )) were significantly correlated to both diffuse attenuation coefficients ( K d ) in the UV-A and UV-B and to DOC concentrations. This indicates CDOM as the dominant attenuator of both UV and PAR solar radiation and suggests its use as an optical proxy for DOC concentrations in this region. While the Mackenzie input is the main driver of CDOM dynamics in low salinity waters, locally, primary production can create significant increases in CDOM. Extrapolating CDOM to DOC relationships, we estimate that ∼16% of the DOC in the Mackenzie River does not absorb radiation at 350 nm. The discharges of DOC and its chromophoric subset (CDOM) by the Mackenzie River during the MALINA cruise are estimated as ∼0.22 TgC and 0.18 TgC, respectively. Three dissolved fluorescent components (C1–C3) were identified by fluorescence excitation/emission matrix spectroscopy (EEMS) and parallel factor (PARAFAC) analysis. Our results showed an aquatic dissolved organic matter (DOM) component (C1), probably produced in the numerous lakes of the watershed, that co-dominated with a terrestrial humic-like component (C2) in the Mackenzie Delta Sector. This aquatic DOM could partially explain the high CDOM spectral slopes observed in the Beaufort Sea. |
format |
Article in Journal/Newspaper |
author |
J. Para B. Charrière A. Matsuoka W. L. Miller J. F. Rontani R. Sempéré |
author_facet |
J. Para B. Charrière A. Matsuoka W. L. Miller J. F. Rontani R. Sempéré |
author_sort |
J. Para |
title |
UV/PAR radiation and DOM properties in surface coastal waters of the Canadian shelf of the Beaufort Sea during summer 2009 |
title_short |
UV/PAR radiation and DOM properties in surface coastal waters of the Canadian shelf of the Beaufort Sea during summer 2009 |
title_full |
UV/PAR radiation and DOM properties in surface coastal waters of the Canadian shelf of the Beaufort Sea during summer 2009 |
title_fullStr |
UV/PAR radiation and DOM properties in surface coastal waters of the Canadian shelf of the Beaufort Sea during summer 2009 |
title_full_unstemmed |
UV/PAR radiation and DOM properties in surface coastal waters of the Canadian shelf of the Beaufort Sea during summer 2009 |
title_sort |
uv/par radiation and dom properties in surface coastal waters of the canadian shelf of the beaufort sea during summer 2009 |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/bg-10-2761-2013 https://doaj.org/article/fbf42dd87dba4dfc8d19e94412b34f10 |
long_lat |
ENVELOPE(-136.672,-136.672,68.833,68.833) |
geographic |
Arctic Arctic Ocean Mackenzie River Mackenzie Delta |
geographic_facet |
Arctic Arctic Ocean Mackenzie River Mackenzie Delta |
genre |
Arctic Arctic Ocean Beaufort Sea Mackenzie Delta Mackenzie river |
genre_facet |
Arctic Arctic Ocean Beaufort Sea Mackenzie Delta Mackenzie river |
op_source |
Biogeosciences, Vol 10, Iss 4, Pp 2761-2774 (2013) |
op_relation |
http://www.biogeosciences.net/10/2761/2013/bg-10-2761-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-2761-2013 1726-4170 1726-4189 https://doaj.org/article/fbf42dd87dba4dfc8d19e94412b34f10 |
op_doi |
https://doi.org/10.5194/bg-10-2761-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
4 |
container_start_page |
2761 |
op_container_end_page |
2774 |
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1766343629231620096 |