Modelling approach to the assessment of biogenic fluxes at a selected Ross Sea site, Antarctica
Abstract Several biogeochemical data have been collected in the last 10 years of Italian activity in Antarctica (ABIOCLEAR, ROSSMIZE, BIOSESO-I/II). A comprehensive 1-D biogeochemical model was implemented as a tool to link observations with processes and to investigate the mechanisms that regulate...
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ftingv:oai:www.earth-prints.org:2122/3453 2023-05-15T13:51:39+02:00 Modelling approach to the assessment of biogenic fluxes at a selected Ross Sea site, Antarctica Vichi, M. Coluccelli, A. Ravaioli, M. Giglio, F. Langone, L. Azzaro, M. Azzaro, F. La Ferla, R. Cozzi, S. Catalano, G. Vichi, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Coluccelli, A.; UNIVPM, Italy Ravaioli, M.; CNR-ISMAR Giglio, F.; CNR-ISMAR Langone, L.; CNR-ISMAR Azzaro, M.; CNR-IAMC Azzaro, F.; CNR-IAMC La Ferla, R.; CNR-IAMC Cozzi, S.; CNR-ISMAR Catalano, G.; CNR-ISMAR Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia UNIVPM, Italy CNR-ISMAR #PLACEHOLDER_PARENT_METADATA_VALUE# CNR-IAMC 2007 http://hdl.handle.net/2122/3453 en eng Journal of Marine Systems http://hdl.handle.net/2122/3453 open Numerical model BFM Antarctica Ross Sea Biogeochemistry model 02. Cryosphere::02.04. Sea ice::02.04.01. Atmosphere/sea ice/ocean interaction 03. Hydrosphere::03.04. Chemical and biological::03.04.01. Biogeochemical cycles 03. Hydrosphere::03.04. Chemical and biological::03.04.02. Carbon cycling 03. Hydrosphere::03.04. Chemical and biological::03.04.04. Ecosystems manuscript 2007 ftingv 2022-07-29T06:04:46Z Abstract Several biogeochemical data have been collected in the last 10 years of Italian activity in Antarctica (ABIOCLEAR, ROSSMIZE, BIOSESO-I/II). A comprehensive 1-D biogeochemical model was implemented as a tool to link observations with processes and to investigate the mechanisms that regulate the flux of biogenic material through the water column. The model is ideally located at station B (175^{o}E - 74^{o}S) and was set up to reproduce the seasonal cycle of phytoplankton and organic matter fluxes as forced by the dominant water column physics over the period 1990-2001. Austral spring-summer bloom conditions are assessed by comparing simulated nutrient drawdown, primary production rates, bacterial respiration and biomass with the available observations. The simulated biogenic fluxes of carbon, nitrogen and silica have been compared with the fluxes derived from sediment traps data. The model reproduces quite well the magnitude of the biogenic fluxes, expecially those observed in the bottom sediment trap, but the peaks are delayed in time. Sensitivity experiments have shown that the characterization of detritus, the choice of the sinking velocity and the degradation rates are crucial for the timing and magnitude of the vertical fluxes. An increase of velocity leads to a shift towards observation but also to an overestimation of the deposition flux which can be counteracted by higher bacterial remineralization rates. Model results suggest that observed fluxes could be explained by the size-distribution and quality of the locally-produced biogenic material. It is hypothesized that the bottom sediment trap collects material originated from rapid sinking of particles and also from previous years production periods, likely modulated by advective and aggregation mechanisms which are still not resolved by the model. Acknowledgements This research was supported by the Italian projects BIOSESO I and II, funded by the Progetto Nazionale di Ricerca in Antartide initiative. MV was partly funded by the Italian project ... Manuscript Antarc* Antarctica Antartide Ross Sea Sea ice Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Austral Ross Sea |
institution |
Open Polar |
collection |
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftingv |
language |
English |
topic |
Numerical model BFM Antarctica Ross Sea Biogeochemistry model 02. Cryosphere::02.04. Sea ice::02.04.01. Atmosphere/sea ice/ocean interaction 03. Hydrosphere::03.04. Chemical and biological::03.04.01. Biogeochemical cycles 03. Hydrosphere::03.04. Chemical and biological::03.04.02. Carbon cycling 03. Hydrosphere::03.04. Chemical and biological::03.04.04. Ecosystems |
spellingShingle |
Numerical model BFM Antarctica Ross Sea Biogeochemistry model 02. Cryosphere::02.04. Sea ice::02.04.01. Atmosphere/sea ice/ocean interaction 03. Hydrosphere::03.04. Chemical and biological::03.04.01. Biogeochemical cycles 03. Hydrosphere::03.04. Chemical and biological::03.04.02. Carbon cycling 03. Hydrosphere::03.04. Chemical and biological::03.04.04. Ecosystems Vichi, M. Coluccelli, A. Ravaioli, M. Giglio, F. Langone, L. Azzaro, M. Azzaro, F. La Ferla, R. Cozzi, S. Catalano, G. Modelling approach to the assessment of biogenic fluxes at a selected Ross Sea site, Antarctica |
topic_facet |
Numerical model BFM Antarctica Ross Sea Biogeochemistry model 02. Cryosphere::02.04. Sea ice::02.04.01. Atmosphere/sea ice/ocean interaction 03. Hydrosphere::03.04. Chemical and biological::03.04.01. Biogeochemical cycles 03. Hydrosphere::03.04. Chemical and biological::03.04.02. Carbon cycling 03. Hydrosphere::03.04. Chemical and biological::03.04.04. Ecosystems |
description |
Abstract Several biogeochemical data have been collected in the last 10 years of Italian activity in Antarctica (ABIOCLEAR, ROSSMIZE, BIOSESO-I/II). A comprehensive 1-D biogeochemical model was implemented as a tool to link observations with processes and to investigate the mechanisms that regulate the flux of biogenic material through the water column. The model is ideally located at station B (175^{o}E - 74^{o}S) and was set up to reproduce the seasonal cycle of phytoplankton and organic matter fluxes as forced by the dominant water column physics over the period 1990-2001. Austral spring-summer bloom conditions are assessed by comparing simulated nutrient drawdown, primary production rates, bacterial respiration and biomass with the available observations. The simulated biogenic fluxes of carbon, nitrogen and silica have been compared with the fluxes derived from sediment traps data. The model reproduces quite well the magnitude of the biogenic fluxes, expecially those observed in the bottom sediment trap, but the peaks are delayed in time. Sensitivity experiments have shown that the characterization of detritus, the choice of the sinking velocity and the degradation rates are crucial for the timing and magnitude of the vertical fluxes. An increase of velocity leads to a shift towards observation but also to an overestimation of the deposition flux which can be counteracted by higher bacterial remineralization rates. Model results suggest that observed fluxes could be explained by the size-distribution and quality of the locally-produced biogenic material. It is hypothesized that the bottom sediment trap collects material originated from rapid sinking of particles and also from previous years production periods, likely modulated by advective and aggregation mechanisms which are still not resolved by the model. Acknowledgements This research was supported by the Italian projects BIOSESO I and II, funded by the Progetto Nazionale di Ricerca in Antartide initiative. MV was partly funded by the Italian project ... |
author2 |
Vichi, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Coluccelli, A.; UNIVPM, Italy Ravaioli, M.; CNR-ISMAR Giglio, F.; CNR-ISMAR Langone, L.; CNR-ISMAR Azzaro, M.; CNR-IAMC Azzaro, F.; CNR-IAMC La Ferla, R.; CNR-IAMC Cozzi, S.; CNR-ISMAR Catalano, G.; CNR-ISMAR Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia UNIVPM, Italy CNR-ISMAR #PLACEHOLDER_PARENT_METADATA_VALUE# CNR-IAMC |
format |
Manuscript |
author |
Vichi, M. Coluccelli, A. Ravaioli, M. Giglio, F. Langone, L. Azzaro, M. Azzaro, F. La Ferla, R. Cozzi, S. Catalano, G. |
author_facet |
Vichi, M. Coluccelli, A. Ravaioli, M. Giglio, F. Langone, L. Azzaro, M. Azzaro, F. La Ferla, R. Cozzi, S. Catalano, G. |
author_sort |
Vichi, M. |
title |
Modelling approach to the assessment of biogenic fluxes at a selected Ross Sea site, Antarctica |
title_short |
Modelling approach to the assessment of biogenic fluxes at a selected Ross Sea site, Antarctica |
title_full |
Modelling approach to the assessment of biogenic fluxes at a selected Ross Sea site, Antarctica |
title_fullStr |
Modelling approach to the assessment of biogenic fluxes at a selected Ross Sea site, Antarctica |
title_full_unstemmed |
Modelling approach to the assessment of biogenic fluxes at a selected Ross Sea site, Antarctica |
title_sort |
modelling approach to the assessment of biogenic fluxes at a selected ross sea site, antarctica |
publishDate |
2007 |
url |
http://hdl.handle.net/2122/3453 |
geographic |
Austral Ross Sea |
geographic_facet |
Austral Ross Sea |
genre |
Antarc* Antarctica Antartide Ross Sea Sea ice |
genre_facet |
Antarc* Antarctica Antartide Ross Sea Sea ice |
op_relation |
Journal of Marine Systems http://hdl.handle.net/2122/3453 |
op_rights |
open |
_version_ |
1766255653832097792 |