Understanding the Transport of Patagonian Dust and Its Influence on Marine Biological Activity in the South Atlantic Ocean
Modeling and remote sensing techniques were applied to examine the horizontal and vertical transport pathways of Patagonian dust and quantify the effect of soluble-iron- laden mineral dust deposition on marine primary productivity in the South Atlantic Ocean (SAO) surface waters. The global chemistr...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20110006354 2023-05-15T18:20:58+02:00 Understanding the Transport of Patagonian Dust and Its Influence on Marine Biological Activity in the South Atlantic Ocean Johnson, Matthew Meskhidze, Nicholas Gasso, Santiago Kiliyanpilakkil, Praju Unclassified, Unlimited, Publicly available [2010] application/pdf http://hdl.handle.net/2060/20110006354 unknown Document ID: 20110006354 http://hdl.handle.net/2060/20110006354 Copyright, Distribution as joint owner in the copyright CASI Oceanography 2010 ftnasantrs 2019-07-21T06:30:33Z Modeling and remote sensing techniques were applied to examine the horizontal and vertical transport pathways of Patagonian dust and quantify the effect of soluble-iron- laden mineral dust deposition on marine primary productivity in the South Atlantic Ocean (SAO) surface waters. The global chemistry transport model GEOS-Chem, implemented with an iron dissolution scheme, was applied to evaluate the atmospheric transport and deposition of mineral dust and bioavailable iron during two dust outbreaks originating in the source regions of Patagonia. In addition to this "rapidly released" iron, offline calculations were also carried out to estimate the amount of bioavailable iron leached during the residence time of dust in the ocean mixed layer. Model simulations showed that the horizontal and vertical transport pathways of Patagonian dust plumes were largely influenced by the synoptic meteorological patterns of high and low pressure systems. Model-predicted horizontal and vertical transport pathways of Patagonian dust over the SAO were in reasonable agreement with remotely-sensed data. Comparison between remotely-sensed and offline calculated ocean surface chlorophyll-a concentrations indicated that, for the two dust outbreaks examined in this study, the deposition of bioavailable iron in the SAO through atmospheric pathways was insignificant. As the two dust transport episodes examined here represent typical outflows of mineral dust from South American sources, our study suggests that the atmospheric deposition of mineral dust is unlikely to induce large scale marine primary productivity and carbon sequestration in the South Atlantic sector of the Southern Ocean. Other/Unknown Material South Atlantic Ocean Southern Ocean NASA Technical Reports Server (NTRS) Southern Ocean Patagonia |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Oceanography |
spellingShingle |
Oceanography Johnson, Matthew Meskhidze, Nicholas Gasso, Santiago Kiliyanpilakkil, Praju Understanding the Transport of Patagonian Dust and Its Influence on Marine Biological Activity in the South Atlantic Ocean |
topic_facet |
Oceanography |
description |
Modeling and remote sensing techniques were applied to examine the horizontal and vertical transport pathways of Patagonian dust and quantify the effect of soluble-iron- laden mineral dust deposition on marine primary productivity in the South Atlantic Ocean (SAO) surface waters. The global chemistry transport model GEOS-Chem, implemented with an iron dissolution scheme, was applied to evaluate the atmospheric transport and deposition of mineral dust and bioavailable iron during two dust outbreaks originating in the source regions of Patagonia. In addition to this "rapidly released" iron, offline calculations were also carried out to estimate the amount of bioavailable iron leached during the residence time of dust in the ocean mixed layer. Model simulations showed that the horizontal and vertical transport pathways of Patagonian dust plumes were largely influenced by the synoptic meteorological patterns of high and low pressure systems. Model-predicted horizontal and vertical transport pathways of Patagonian dust over the SAO were in reasonable agreement with remotely-sensed data. Comparison between remotely-sensed and offline calculated ocean surface chlorophyll-a concentrations indicated that, for the two dust outbreaks examined in this study, the deposition of bioavailable iron in the SAO through atmospheric pathways was insignificant. As the two dust transport episodes examined here represent typical outflows of mineral dust from South American sources, our study suggests that the atmospheric deposition of mineral dust is unlikely to induce large scale marine primary productivity and carbon sequestration in the South Atlantic sector of the Southern Ocean. |
author |
Johnson, Matthew Meskhidze, Nicholas Gasso, Santiago Kiliyanpilakkil, Praju |
author_facet |
Johnson, Matthew Meskhidze, Nicholas Gasso, Santiago Kiliyanpilakkil, Praju |
author_sort |
Johnson, Matthew |
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 |
publishDate |
2010 |
url |
http://hdl.handle.net/2060/20110006354 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Southern Ocean Patagonia |
geographic_facet |
Southern Ocean Patagonia |
genre |
South Atlantic Ocean Southern Ocean |
genre_facet |
South Atlantic Ocean Southern Ocean |
op_source |
CASI |
op_relation |
Document ID: 20110006354 http://hdl.handle.net/2060/20110006354 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766199946795548672 |