Understanding the transport of Patagonian dust and its influence on marine biological activity in the South Atlantic Ocean
The supply of bioavailable iron to the high-nitrate low-chlorophyll (HNLC) waters of the Southern Ocean through atmospheric pathways could stimulate phytoplankton blooms and have major implications for the global carbon cycle. In this study, model results and remotely-sensed data are analyzed to exa...
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ftdoajarticles:oai:doaj.org/article:a4cd888f851848d4973b51e5e6a98ca5 2023-05-15T13:47:39+02:00 Understanding the transport of Patagonian dust and its influence on marine biological activity in the South Atlantic Ocean M. S. Johnson N. Meskhidze V. P. Kiliyanpilakkil S. Gassó 2011-03-01T00:00:00Z https://doi.org/10.5194/acp-11-2487-2011 https://doaj.org/article/a4cd888f851848d4973b51e5e6a98ca5 EN eng Copernicus Publications http://www.atmos-chem-phys.net/11/2487/2011/acp-11-2487-2011.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-11-2487-2011 1680-7316 1680-7324 https://doaj.org/article/a4cd888f851848d4973b51e5e6a98ca5 Atmospheric Chemistry and Physics, Vol 11, Iss 6, Pp 2487-2502 (2011) Physics QC1-999 Chemistry QD1-999 article 2011 ftdoajarticles https://doi.org/10.5194/acp-11-2487-2011 2022-12-31T07:22:28Z The supply of bioavailable iron to the high-nitrate low-chlorophyll (HNLC) waters of the Southern Ocean through atmospheric pathways could stimulate phytoplankton blooms and have major implications for the global carbon cycle. In this study, model results and remotely-sensed data are analyzed to examine the horizontal and vertical transport pathways of Patagonian dust and quantify the effect of iron-laden mineral dust deposition on marine biological productivity in the surface waters of the South Atlantic Ocean (SAO). Model simulations for the atmospheric transport and deposition of mineral dust and bioavailable iron are carried out for two large dust outbreaks originated at the source regions of northern Patagonia during the austral summer of 2009. Model-simulated horizontal and vertical transport pathways of Patagonian dust plumes are in reasonable agreement with remotely-sensed data. Simulations indicate that the synoptic meteorological patterns of high and low pressure systems are largely accountable for dust transport trajectories over the SAO. According to model results and retrievals from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO), synoptic flows caused by opposing pressure systems (a high pressure system located to the east or north-east of a low pressure system) elevate the South American dust plumes well above the marine boundary layer. Under such conditions, the bulk concentration of mineral dust can quickly be transported around the low pressure system in a clockwise manner, follow the southeasterly advection pathway, and reach the HNLC waters of the SAO and Antarctica in ~3–4 days after emission from the source regions of northern Patagonia. Two different mechanisms for dust-iron mobilization into a bioavailable form are considered in this study. A global 3-D chemical transport model (GEOS-Chem), implemented with an iron dissolution scheme, is employed to estimate the atmospheric fluxes of soluble iron, while a dust/biota assessment tool (Boyd et al., 2010) is ... Article in Journal/Newspaper Antarc* Antarctica South Atlantic Ocean Southern Ocean Directory of Open Access Journals: DOAJ Articles Austral Patagonia Southern Ocean Atmospheric Chemistry and Physics 11 6 2487 2502 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 M. S. Johnson N. Meskhidze V. P. Kiliyanpilakkil S. Gassó Understanding the transport of Patagonian dust and its influence on marine biological activity in the South Atlantic Ocean |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
The supply of bioavailable iron to the high-nitrate low-chlorophyll (HNLC) waters of the Southern Ocean through atmospheric pathways could stimulate phytoplankton blooms and have major implications for the global carbon cycle. In this study, model results and remotely-sensed data are analyzed to examine the horizontal and vertical transport pathways of Patagonian dust and quantify the effect of iron-laden mineral dust deposition on marine biological productivity in the surface waters of the South Atlantic Ocean (SAO). Model simulations for the atmospheric transport and deposition of mineral dust and bioavailable iron are carried out for two large dust outbreaks originated at the source regions of northern Patagonia during the austral summer of 2009. Model-simulated horizontal and vertical transport pathways of Patagonian dust plumes are in reasonable agreement with remotely-sensed data. Simulations indicate that the synoptic meteorological patterns of high and low pressure systems are largely accountable for dust transport trajectories over the SAO. According to model results and retrievals from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO), synoptic flows caused by opposing pressure systems (a high pressure system located to the east or north-east of a low pressure system) elevate the South American dust plumes well above the marine boundary layer. Under such conditions, the bulk concentration of mineral dust can quickly be transported around the low pressure system in a clockwise manner, follow the southeasterly advection pathway, and reach the HNLC waters of the SAO and Antarctica in ~3–4 days after emission from the source regions of northern Patagonia. Two different mechanisms for dust-iron mobilization into a bioavailable form are considered in this study. A global 3-D chemical transport model (GEOS-Chem), implemented with an iron dissolution scheme, is employed to estimate the atmospheric fluxes of soluble iron, while a dust/biota assessment tool (Boyd et al., 2010) is ... |
format |
Article in Journal/Newspaper |
author |
M. S. Johnson N. Meskhidze V. P. Kiliyanpilakkil S. Gassó |
author_facet |
M. S. Johnson N. Meskhidze V. P. Kiliyanpilakkil S. Gassó |
author_sort |
M. S. Johnson |
title |
Understanding the transport of Patagonian dust and its influence on marine biological activity in the South Atlantic Ocean |
title_short |
Understanding the transport of Patagonian dust and its influence on marine biological activity in the South Atlantic Ocean |
title_full |
Understanding the transport of Patagonian dust and its influence on marine biological activity in the South Atlantic Ocean |
title_fullStr |
Understanding the transport of Patagonian dust and its influence on marine biological activity in the South Atlantic Ocean |
title_full_unstemmed |
Understanding the transport of Patagonian dust and its influence on marine biological activity in the South Atlantic Ocean |
title_sort |
understanding the transport of patagonian dust and its influence on marine biological activity in the south atlantic ocean |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/acp-11-2487-2011 https://doaj.org/article/a4cd888f851848d4973b51e5e6a98ca5 |
geographic |
Austral Patagonia Southern Ocean |
geographic_facet |
Austral Patagonia Southern Ocean |
genre |
Antarc* Antarctica South Atlantic Ocean Southern Ocean |
genre_facet |
Antarc* Antarctica South Atlantic Ocean Southern Ocean |
op_source |
Atmospheric Chemistry and Physics, Vol 11, Iss 6, Pp 2487-2502 (2011) |
op_relation |
http://www.atmos-chem-phys.net/11/2487/2011/acp-11-2487-2011.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-11-2487-2011 1680-7316 1680-7324 https://doaj.org/article/a4cd888f851848d4973b51e5e6a98ca5 |
op_doi |
https://doi.org/10.5194/acp-11-2487-2011 |
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Atmospheric Chemistry and Physics |
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11 |
container_issue |
6 |
container_start_page |
2487 |
op_container_end_page |
2502 |
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