Particulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project)

<p>We report on the sub-basin variability in particulate organic carbon (POC) remineralization in the western and central Mediterranean Sea in late spring during the PEACETIME (ProcEss studies at the Air–sEa Interface after dust deposition in the MEditerranean sea) cruise. POC remineralization...

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Autores principales:	S. H. M. Jacquet, C. Tamburini, M. Garel, A. Dufour, F. Van Vambeke, F. A. C. Le Moigne, N. Bhairy, S. Guasco
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/a7b86cf5453d46b5a37290edfd5ca8ba
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spelling	oai:doaj.org-article:a7b86cf5453d46b5a37290edfd5ca8ba2021-11-16T07:33:19ZParticulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project)10.5194/bg-18-5891-20211726-41701726-4189https://doaj.org/article/a7b86cf5453d46b5a37290edfd5ca8ba2021-11-01T00:00:00Zhttps://bg.copernicus.org/articles/18/5891/2021/bg-18-5891-2021.pdfhttps://doaj.org/toc/1726-4170https://doaj.org/toc/1726-4189<p>We report on the sub-basin variability in particulate organic carbon (POC) remineralization in the western and central Mediterranean Sea in late spring during the PEACETIME (ProcEss studies at the Air–sEa Interface after dust deposition in the MEditerranean sea) cruise. POC remineralization rates were estimated using the excess biogenic particulate barium (Ba<span class="inline-formula"><sub>xs</sub></span>) inventories in the mesopelagic layers (100–1000 m depth) and compared with prokaryotic heterotrophic production (PHP). Ba<span class="inline-formula"><sub>xs</sub></span>-based mesopelagic remineralization rates (MRs) ranged from <span class="inline-formula">25±2</span> to <span class="inline-formula">306±70</span> <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M5" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><mi mathvariant="normal">mg</mi><mspace width="0.125em" linebreak="nobreak"/><mi mathvariant="normal">C</mi><mspace linebreak="nobreak" width="0.125em"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">2</mn></mrow></msup><mspace linebreak="nobreak" width="0.125em"/><msup><mi mathvariant="normal">d</mi><mrow><mo>-</mo><mn mathvariant="normal">1</mn></mrow></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="65pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="4fefc29e267f9d3301a40e775f89bd80"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-18-5891-2021-ie00001.svg" width="65pt" height="15pt" src="bg-18-5891-2021-ie00001.png"/></svg:svg></span></span>. MRs were larger in the Algero-Provençal (ALG) Basin than in the Tyrrhenian (TYR) and Ionian (ION) basins. Our Ba<span class="inline-formula"><sub>xs</sub></span> inventories and integrated PHP data also indicated that significant mesopelagic remineralization occurred down to 1000 m depth in the ALG Basin in contrast to the ION and TYR basins, where remineralization was mainly located above 500 m depth. We propose that the higher and deeper MRs in the ALG Basin were sustained by an additional particle export event driven by deep convection. The TYR Basin (in contrast to the ALG and ION basins) presented the impact of a previous dust event, as reflected by our particulate Al water column concentrations. The ION and TYR basins showed small-scale heterogeneity in remineralization processes, reflected by our Ba<span class="inline-formula"><sub>xs</sub></span> inventories and integrated PHP data at the Tyrr long-duration station. This heterogeneity was linked to the mosaic of blooming and non-blooming patches reported in this area during the cruise. In contrast to the western Mediterranean Sea (ALG Basin), the central Mediterranean Sea (ION and TYR basins) showed lower remineralization rates restricted to the upper mesopelagic layer during the late spring PEACETIME cruise.</p>S. H. M. JacquetC. TamburiniM. GarelA. DufourF. Van VambekeF. A. C. Le MoigneN. BhairyS. GuascoCopernicus PublicationsarticleEcologyQH540-549.5LifeQH501-531GeologyQE1-996.5ENBiogeosciences, Vol 18, Pp 5891-5902 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5
spellingShingle	Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 S. H. M. Jacquet C. Tamburini M. Garel A. Dufour F. Van Vambeke F. A. C. Le Moigne N. Bhairy S. Guasco Particulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project)
description	<p>We report on the sub-basin variability in particulate organic carbon (POC) remineralization in the western and central Mediterranean Sea in late spring during the PEACETIME (ProcEss studies at the Air–sEa Interface after dust deposition in the MEditerranean sea) cruise. POC remineralization rates were estimated using the excess biogenic particulate barium (Ba<span class="inline-formula"><sub>xs</sub></span>) inventories in the mesopelagic layers (100–1000 m depth) and compared with prokaryotic heterotrophic production (PHP). Ba<span class="inline-formula"><sub>xs</sub></span>-based mesopelagic remineralization rates (MRs) ranged from <span class="inline-formula">25±2</span> to <span class="inline-formula">306±70</span> <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M5" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><mi mathvariant="normal">mg</mi><mspace width="0.125em" linebreak="nobreak"/><mi mathvariant="normal">C</mi><mspace linebreak="nobreak" width="0.125em"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">2</mn></mrow></msup><mspace linebreak="nobreak" width="0.125em"/><msup><mi mathvariant="normal">d</mi><mrow><mo>-</mo><mn mathvariant="normal">1</mn></mrow></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="65pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="4fefc29e267f9d3301a40e775f89bd80"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-18-5891-2021-ie00001.svg" width="65pt" height="15pt" src="bg-18-5891-2021-ie00001.png"/></svg:svg></span></span>. MRs were larger in the Algero-Provençal (ALG) Basin than in the Tyrrhenian (TYR) and Ionian (ION) basins. Our Ba<span class="inline-formula"><sub>xs</sub></span> inventories and integrated PHP data also indicated that significant mesopelagic remineralization occurred down to 1000 m depth in the ALG Basin in contrast to the ION and TYR basins, where remineralization was mainly located above 500 m depth. We propose that the higher and deeper MRs in the ALG Basin were sustained by an additional particle export event driven by deep convection. The TYR Basin (in contrast to the ALG and ION basins) presented the impact of a previous dust event, as reflected by our particulate Al water column concentrations. The ION and TYR basins showed small-scale heterogeneity in remineralization processes, reflected by our Ba<span class="inline-formula"><sub>xs</sub></span> inventories and integrated PHP data at the Tyrr long-duration station. This heterogeneity was linked to the mosaic of blooming and non-blooming patches reported in this area during the cruise. In contrast to the western Mediterranean Sea (ALG Basin), the central Mediterranean Sea (ION and TYR basins) showed lower remineralization rates restricted to the upper mesopelagic layer during the late spring PEACETIME cruise.</p>
format	article
author	S. H. M. Jacquet C. Tamburini M. Garel A. Dufour F. Van Vambeke F. A. C. Le Moigne N. Bhairy S. Guasco
author_facet	S. H. M. Jacquet C. Tamburini M. Garel A. Dufour F. Van Vambeke F. A. C. Le Moigne N. Bhairy S. Guasco
author_sort	S. H. M. Jacquet
title	Particulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project)
title_short	Particulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project)
title_full	Particulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project)
title_fullStr	Particulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project)
title_full_unstemmed	Particulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project)
title_sort	particulate biogenic barium tracer of mesopelagic carbon remineralization in the mediterranean sea (peacetime project)
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/a7b86cf5453d46b5a37290edfd5ca8ba
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Particulate biogenic barium tracer of mesopelagic carbon remineralization in the Mediterranean Sea (PEACETIME project)

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