Ecosystem function and particle flux dynamics across the Mackenzie Shelf (Beaufort Sea, Arctic Ocean): an integrative analysis of spatial variability and biophysical forcings
A. Forest et al. -- 78 pages, 18 figures, 6 tables A better understanding of how environmental changes affect organic matter fluxes in Arctic marine ecosystems is sorely needed. Here, we combine mooring times-series, ship-based measurements and remote-sensing to assess the variability and forcing fa...
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ftcsic:oai:digital.csic.es:10261/63056 2024-02-11T10:01:10+01:00 Ecosystem function and particle flux dynamics across the Mackenzie Shelf (Beaufort Sea, Arctic Ocean): an integrative analysis of spatial variability and biophysical forcings Forest, Alexandre Ortega-Retuerta, E. Martín, Jacobo 2012-08 http://hdl.handle.net/10261/63056 https://doi.org/10.5194/bgd-9-10883-2012 en eng European Geosciences Union https://doi.org/10.5194/bgd-9-10883-2012 Biogeosciences Discussions 9: 10883-10960 (2012) 1810-6277 http://hdl.handle.net/10261/63056 doi:10.5194/bgd-9-10883-2012 1810-6285 open artículo http://purl.org/coar/resource_type/c_6501 2012 ftcsic https://doi.org/10.5194/bgd-9-10883-2012 2024-01-16T09:43:44Z A. Forest et al. -- 78 pages, 18 figures, 6 tables A better understanding of how environmental changes affect organic matter fluxes in Arctic marine ecosystems is sorely needed. Here, we combine mooring times-series, ship-based measurements and remote-sensing to assess the variability and forcing factors of vertical fluxes of particulate organic carbon (POC) across the Mackenzie Shelf in 2009. We developed a geospatial model of these fluxes to proceed to an integrative analysis of their biophysical determinants in summer. Flux data were obtained with sediment traps and via a regional empirical algorithm applied to particle size-distributions (17 classes from 0.08–4.2 mm) measured by an Underwater Vision Profiler 5. Redundancy analyses and forward selection of abiotic/biotic parameters, linear trends, and spatial structures (i.e. principal coordinates of neighbor matrices, PCNM), were conducted to partition the variation of POC flux size-classes. Flux variability was explained at 69.5 % by the addition of a linear temporal trend, 7 significant PCNM and 9 biophysical variables. The interaction of all these factors explained 27.8 % of the variability. The first PCNM canonical axis (44.4 % of spatial variance) reflected a shelf-basin gradient controlled by bottom depth and ice concentration (p < 0.01), but a complex assemblage of fine-to-broad scale patterns was also identified. Among biophysical parameters, bacterial production and northeasterly wind (upwelling-favorable) were the two strongest explanatory variables (r2 cum. = 0.37), suggesting that bacteria were associated with sinking material, which was itself partly linked to upwelling-induced productivity. The second most important spatial structure corresponded actually to the two areas where shelf break upwelling is known to occur under easterlies. Copepod biomass was negatively correlated (p < 0.05) with vertical POC fluxes, implying that metazoans played a significant role in the regulation of export fluxes. The low fractal dimension of settling ... Article in Journal/Newspaper Arctic Arctic Ocean Beaufort Sea Mackenzie Shelf Digital.CSIC (Spanish National Research Council) Arctic Arctic Ocean |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
description |
A. Forest et al. -- 78 pages, 18 figures, 6 tables A better understanding of how environmental changes affect organic matter fluxes in Arctic marine ecosystems is sorely needed. Here, we combine mooring times-series, ship-based measurements and remote-sensing to assess the variability and forcing factors of vertical fluxes of particulate organic carbon (POC) across the Mackenzie Shelf in 2009. We developed a geospatial model of these fluxes to proceed to an integrative analysis of their biophysical determinants in summer. Flux data were obtained with sediment traps and via a regional empirical algorithm applied to particle size-distributions (17 classes from 0.08–4.2 mm) measured by an Underwater Vision Profiler 5. Redundancy analyses and forward selection of abiotic/biotic parameters, linear trends, and spatial structures (i.e. principal coordinates of neighbor matrices, PCNM), were conducted to partition the variation of POC flux size-classes. Flux variability was explained at 69.5 % by the addition of a linear temporal trend, 7 significant PCNM and 9 biophysical variables. The interaction of all these factors explained 27.8 % of the variability. The first PCNM canonical axis (44.4 % of spatial variance) reflected a shelf-basin gradient controlled by bottom depth and ice concentration (p < 0.01), but a complex assemblage of fine-to-broad scale patterns was also identified. Among biophysical parameters, bacterial production and northeasterly wind (upwelling-favorable) were the two strongest explanatory variables (r2 cum. = 0.37), suggesting that bacteria were associated with sinking material, which was itself partly linked to upwelling-induced productivity. The second most important spatial structure corresponded actually to the two areas where shelf break upwelling is known to occur under easterlies. Copepod biomass was negatively correlated (p < 0.05) with vertical POC fluxes, implying that metazoans played a significant role in the regulation of export fluxes. The low fractal dimension of settling ... |
format |
Article in Journal/Newspaper |
author |
Forest, Alexandre Ortega-Retuerta, E. Martín, Jacobo |
spellingShingle |
Forest, Alexandre Ortega-Retuerta, E. Martín, Jacobo Ecosystem function and particle flux dynamics across the Mackenzie Shelf (Beaufort Sea, Arctic Ocean): an integrative analysis of spatial variability and biophysical forcings |
author_facet |
Forest, Alexandre Ortega-Retuerta, E. Martín, Jacobo |
author_sort |
Forest, Alexandre |
title |
Ecosystem function and particle flux dynamics across the Mackenzie Shelf (Beaufort Sea, Arctic Ocean): an integrative analysis of spatial variability and biophysical forcings |
title_short |
Ecosystem function and particle flux dynamics across the Mackenzie Shelf (Beaufort Sea, Arctic Ocean): an integrative analysis of spatial variability and biophysical forcings |
title_full |
Ecosystem function and particle flux dynamics across the Mackenzie Shelf (Beaufort Sea, Arctic Ocean): an integrative analysis of spatial variability and biophysical forcings |
title_fullStr |
Ecosystem function and particle flux dynamics across the Mackenzie Shelf (Beaufort Sea, Arctic Ocean): an integrative analysis of spatial variability and biophysical forcings |
title_full_unstemmed |
Ecosystem function and particle flux dynamics across the Mackenzie Shelf (Beaufort Sea, Arctic Ocean): an integrative analysis of spatial variability and biophysical forcings |
title_sort |
ecosystem function and particle flux dynamics across the mackenzie shelf (beaufort sea, arctic ocean): an integrative analysis of spatial variability and biophysical forcings |
publisher |
European Geosciences Union |
publishDate |
2012 |
url |
http://hdl.handle.net/10261/63056 https://doi.org/10.5194/bgd-9-10883-2012 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Beaufort Sea Mackenzie Shelf |
genre_facet |
Arctic Arctic Ocean Beaufort Sea Mackenzie Shelf |
op_relation |
https://doi.org/10.5194/bgd-9-10883-2012 Biogeosciences Discussions 9: 10883-10960 (2012) 1810-6277 http://hdl.handle.net/10261/63056 doi:10.5194/bgd-9-10883-2012 1810-6285 |
op_rights |
open |
op_doi |
https://doi.org/10.5194/bgd-9-10883-2012 |
_version_ |
1790596931677847552 |