Modeling dust and soluble iron deposition to the South Atlantic Ocean
International audience The global chemical transport model GEOS-Chem, implemented with a dust-iron dissolution scheme, was used to analyze the magnitude and spatial distribution of mineral dust and soluble-iron (sol-Fe) deposition to the South Atlantic Ocean (SAO). The comparison of model results wi...
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Online Access: | https://hal.science/hal-00993293 https://hal.science/hal-00993293/document https://hal.science/hal-00993293/file/Journal%20of%20Geophysical%20Research%20Atmospheres%20-%202010%20-%20Johnson%20-%20Modeling%20dust%20and%20soluble%20iron%20deposition%20to%20the%20South.pdf https://doi.org/10.1029/2009JD013311 |
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ftmeteofrance:oai:HAL:hal-00993293v1 2024-09-15T18:36:23+00:00 Modeling dust and soluble iron deposition to the South Atlantic Ocean M.S., Johnson N., Meskidze F., Solmon S., Gasso P.Y., Chuang D.M., Gaiero R.M., Yantosca S., Wu Y., Wang C., Carouge Laboratoire d'aérologie (LAERO) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) 2010 https://hal.science/hal-00993293 https://hal.science/hal-00993293/document https://hal.science/hal-00993293/file/Journal%20of%20Geophysical%20Research%20Atmospheres%20-%202010%20-%20Johnson%20-%20Modeling%20dust%20and%20soluble%20iron%20deposition%20to%20the%20South.pdf https://doi.org/10.1029/2009JD013311 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2009JD013311 hal-00993293 https://hal.science/hal-00993293 https://hal.science/hal-00993293/document https://hal.science/hal-00993293/file/Journal%20of%20Geophysical%20Research%20Atmospheres%20-%202010%20-%20Johnson%20-%20Modeling%20dust%20and%20soluble%20iron%20deposition%20to%20the%20South.pdf doi:10.1029/2009JD013311 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00993293 Journal of Geophysical Research, 2010, 115 (D15), pp.D15202. ⟨10.1029/2009JD013311⟩ dust soluble iron Patagonia [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/article Journal articles 2010 ftmeteofrance https://doi.org/10.1029/2009JD013311 2024-06-25T00:09:30Z International audience The global chemical transport model GEOS-Chem, implemented with a dust-iron dissolution scheme, was used to analyze the magnitude and spatial distribution of mineral dust and soluble-iron (sol-Fe) deposition to the South Atlantic Ocean (SAO). The comparison of model results with remotely sensed data shows that GEOS-Chem can capture dust source regions in Patagonia and characterize the temporal variability of dust outflow. For a year-long model simulation, 22 Tg of mineral dust and 4 Gg of sol-Fe were deposited to the surface waters of the entire SAO region, with roughly 30% of this dust and sol-Fe predicted to be deposited to possible high nitrate low chlorophyll oceanic regions. Model-predicted dissolved iron fraction of mineral dust over the SAO was small, on average only accounting for 0.57% of total iron. Simulations suggest that the primary reason for such a small fraction of sol-Fe is the low ambient concentrations of acidic trace gases available for mixing with dust plumes. Overall, the amount of acid added to the deliquesced aerosol solution was not enough to overcome the alkalinity buffer of Patagonian dust and initiate considerable acid dissolution of mineral-iron. Sensitivity studies show that the amount of sol-Fe deposited to the SAO was largely controlled by the initial amount of sol-Fe at the source region, with limited contribution from the spatial variability of Patagonian-desert topsoil mineralogy and natural sources of acidic trace gases. Simulations suggest that Patagonian dust should have a minor effect on biological productivity in the SAO. Article in Journal/Newspaper South Atlantic Ocean Météo-France: HAL Journal of Geophysical Research 115 D15 |
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Météo-France: HAL |
op_collection_id |
ftmeteofrance |
language |
English |
topic |
dust soluble iron Patagonia [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
spellingShingle |
dust soluble iron Patagonia [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] M.S., Johnson N., Meskidze F., Solmon S., Gasso P.Y., Chuang D.M., Gaiero R.M., Yantosca S., Wu Y., Wang C., Carouge Modeling dust and soluble iron deposition to the South Atlantic Ocean |
topic_facet |
dust soluble iron Patagonia [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
International audience The global chemical transport model GEOS-Chem, implemented with a dust-iron dissolution scheme, was used to analyze the magnitude and spatial distribution of mineral dust and soluble-iron (sol-Fe) deposition to the South Atlantic Ocean (SAO). The comparison of model results with remotely sensed data shows that GEOS-Chem can capture dust source regions in Patagonia and characterize the temporal variability of dust outflow. For a year-long model simulation, 22 Tg of mineral dust and 4 Gg of sol-Fe were deposited to the surface waters of the entire SAO region, with roughly 30% of this dust and sol-Fe predicted to be deposited to possible high nitrate low chlorophyll oceanic regions. Model-predicted dissolved iron fraction of mineral dust over the SAO was small, on average only accounting for 0.57% of total iron. Simulations suggest that the primary reason for such a small fraction of sol-Fe is the low ambient concentrations of acidic trace gases available for mixing with dust plumes. Overall, the amount of acid added to the deliquesced aerosol solution was not enough to overcome the alkalinity buffer of Patagonian dust and initiate considerable acid dissolution of mineral-iron. Sensitivity studies show that the amount of sol-Fe deposited to the SAO was largely controlled by the initial amount of sol-Fe at the source region, with limited contribution from the spatial variability of Patagonian-desert topsoil mineralogy and natural sources of acidic trace gases. Simulations suggest that Patagonian dust should have a minor effect on biological productivity in the SAO. |
author2 |
Laboratoire d'aérologie (LAERO) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
M.S., Johnson N., Meskidze F., Solmon S., Gasso P.Y., Chuang D.M., Gaiero R.M., Yantosca S., Wu Y., Wang C., Carouge |
author_facet |
M.S., Johnson N., Meskidze F., Solmon S., Gasso P.Y., Chuang D.M., Gaiero R.M., Yantosca S., Wu Y., Wang C., Carouge |
author_sort |
M.S., Johnson |
title |
Modeling dust and soluble iron deposition to the South Atlantic Ocean |
title_short |
Modeling dust and soluble iron deposition to the South Atlantic Ocean |
title_full |
Modeling dust and soluble iron deposition to the South Atlantic Ocean |
title_fullStr |
Modeling dust and soluble iron deposition to the South Atlantic Ocean |
title_full_unstemmed |
Modeling dust and soluble iron deposition to the South Atlantic Ocean |
title_sort |
modeling dust and soluble iron deposition to the south atlantic ocean |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.science/hal-00993293 https://hal.science/hal-00993293/document https://hal.science/hal-00993293/file/Journal%20of%20Geophysical%20Research%20Atmospheres%20-%202010%20-%20Johnson%20-%20Modeling%20dust%20and%20soluble%20iron%20deposition%20to%20the%20South.pdf https://doi.org/10.1029/2009JD013311 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00993293 Journal of Geophysical Research, 2010, 115 (D15), pp.D15202. ⟨10.1029/2009JD013311⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2009JD013311 hal-00993293 https://hal.science/hal-00993293 https://hal.science/hal-00993293/document https://hal.science/hal-00993293/file/Journal%20of%20Geophysical%20Research%20Atmospheres%20-%202010%20-%20Johnson%20-%20Modeling%20dust%20and%20soluble%20iron%20deposition%20to%20the%20South.pdf doi:10.1029/2009JD013311 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2009JD013311 |
container_title |
Journal of Geophysical Research |
container_volume |
115 |
container_issue |
D15 |
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1810480013064011776 |