Atmospheric dust dynamics in southern South America: A 14-year modern dust record in the loessic Pampean region
Mineral aerosols profoundly impact global climate. Modeling of the dust cycle is the main tool used to gauge this effect. However, the scarcity of in situ modern dust flux measurements is the main reason why validation of existing models is hampered. We present the first long-term (14-year) record o...
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crsagepubl:10.1177/0959683619875198 2024-03-03T08:36:59+00:00 Atmospheric dust dynamics in southern South America: A 14-year modern dust record in the loessic Pampean region Cosentino, Nicolás J Gaiero, Diego M Torre, Gabriela Pasquini, Andrea I Coppo, Renata Arce, Juan M Vélez, Georgina IAI Fondo para la Investigación Científica y Tecnológica Fondo para la Investigación Científica y Tecnológica Universidad Nacional de Córdoba Weizmann Institute of Science Fundación Antorchas 2019 http://dx.doi.org/10.1177/0959683619875198 http://journals.sagepub.com/doi/pdf/10.1177/0959683619875198 http://journals.sagepub.com/doi/full-xml/10.1177/0959683619875198 en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 30, issue 4, page 575-588 ISSN 0959-6836 1477-0911 Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change journal-article 2019 crsagepubl https://doi.org/10.1177/0959683619875198 2024-02-05T10:38:05Z Mineral aerosols profoundly impact global climate. Modeling of the dust cycle is the main tool used to gauge this effect. However, the scarcity of in situ modern dust flux measurements is the main reason why validation of existing models is hampered. We present the first long-term (14-year) record of dust flux in the Pampas, southern South America, home to the largest loess deposit in the Southern Hemisphere. Measured 14-year mean deposition (40 g m −2 year −1 ) and horizontal (362 g m −2 year −1 ) fluxes imply that current models underestimate the power of the central Pampas as a dust sink. Based on cross-spectral analysis, both wet and, to a lesser extent, dry deposition are found to play significant roles in atmospheric dust extraction. Dust is sourced regionally from the South American Arid Diagonal and from the shores of Mar Chiquita lake (~260 km), which we find to be the main contributor of dust particles >30 µm. Cross-spectral and satellite image analyses show that surface wind speed and precipitation at the Puna-Altiplano Plateau are controlling factors for horizontal dust flux in the Pampas. El Niño Southern Oscillation probably plays a role in controlling interannual horizontal dust flux periodicities. Finally, preliminary comparisons between modern vertical dust fluxes and loess accumulation rates point to the Pampas as a more powerful dust sink during the last deglaciation and Antarctic Cold Reversal (18–12.5 ka). Article in Journal/Newspaper Antarc* Antarctic SAGE Publications Antarctic The Holocene 30 4 575 588 |
institution |
Open Polar |
collection |
SAGE Publications |
op_collection_id |
crsagepubl |
language |
English |
topic |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
spellingShingle |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change Cosentino, Nicolás J Gaiero, Diego M Torre, Gabriela Pasquini, Andrea I Coppo, Renata Arce, Juan M Vélez, Georgina Atmospheric dust dynamics in southern South America: A 14-year modern dust record in the loessic Pampean region |
topic_facet |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
description |
Mineral aerosols profoundly impact global climate. Modeling of the dust cycle is the main tool used to gauge this effect. However, the scarcity of in situ modern dust flux measurements is the main reason why validation of existing models is hampered. We present the first long-term (14-year) record of dust flux in the Pampas, southern South America, home to the largest loess deposit in the Southern Hemisphere. Measured 14-year mean deposition (40 g m −2 year −1 ) and horizontal (362 g m −2 year −1 ) fluxes imply that current models underestimate the power of the central Pampas as a dust sink. Based on cross-spectral analysis, both wet and, to a lesser extent, dry deposition are found to play significant roles in atmospheric dust extraction. Dust is sourced regionally from the South American Arid Diagonal and from the shores of Mar Chiquita lake (~260 km), which we find to be the main contributor of dust particles >30 µm. Cross-spectral and satellite image analyses show that surface wind speed and precipitation at the Puna-Altiplano Plateau are controlling factors for horizontal dust flux in the Pampas. El Niño Southern Oscillation probably plays a role in controlling interannual horizontal dust flux periodicities. Finally, preliminary comparisons between modern vertical dust fluxes and loess accumulation rates point to the Pampas as a more powerful dust sink during the last deglaciation and Antarctic Cold Reversal (18–12.5 ka). |
author2 |
IAI Fondo para la Investigación Científica y Tecnológica Fondo para la Investigación Científica y Tecnológica Universidad Nacional de Córdoba Weizmann Institute of Science Fundación Antorchas |
format |
Article in Journal/Newspaper |
author |
Cosentino, Nicolás J Gaiero, Diego M Torre, Gabriela Pasquini, Andrea I Coppo, Renata Arce, Juan M Vélez, Georgina |
author_facet |
Cosentino, Nicolás J Gaiero, Diego M Torre, Gabriela Pasquini, Andrea I Coppo, Renata Arce, Juan M Vélez, Georgina |
author_sort |
Cosentino, Nicolás J |
title |
Atmospheric dust dynamics in southern South America: A 14-year modern dust record in the loessic Pampean region |
title_short |
Atmospheric dust dynamics in southern South America: A 14-year modern dust record in the loessic Pampean region |
title_full |
Atmospheric dust dynamics in southern South America: A 14-year modern dust record in the loessic Pampean region |
title_fullStr |
Atmospheric dust dynamics in southern South America: A 14-year modern dust record in the loessic Pampean region |
title_full_unstemmed |
Atmospheric dust dynamics in southern South America: A 14-year modern dust record in the loessic Pampean region |
title_sort |
atmospheric dust dynamics in southern south america: a 14-year modern dust record in the loessic pampean region |
publisher |
SAGE Publications |
publishDate |
2019 |
url |
http://dx.doi.org/10.1177/0959683619875198 http://journals.sagepub.com/doi/pdf/10.1177/0959683619875198 http://journals.sagepub.com/doi/full-xml/10.1177/0959683619875198 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
The Holocene volume 30, issue 4, page 575-588 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/0959683619875198 |
container_title |
The Holocene |
container_volume |
30 |
container_issue |
4 |
container_start_page |
575 |
op_container_end_page |
588 |
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1792496730245169152 |