Giant dust particles at Nevado Illimani: a proxy of summertime deep convection over the Bolivian Altiplano
International audience A deeper understanding of past atmospheric circulation variability in the Central Andes is a high-priority topic in paleoclimatology mainly because of the necessity to validate climate models used to predict future precipitation trends and to develop mitigation and/or adaptati...
Published in: | The Cryosphere |
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Online Access: | https://insu.hal.science/insu-03706457 https://insu.hal.science/insu-03706457/document https://insu.hal.science/insu-03706457/file/tc-15-1383-2021.pdf https://doi.org/10.5194/tc-15-1383-2021 |
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ftinsu:oai:HAL:insu-03706457v1 2024-04-28T08:40:26+00:00 Giant dust particles at Nevado Illimani: a proxy of summertime deep convection over the Bolivian Altiplano Lindau, Filipe G. L. Simões, Jefferson C. Delmonte, Barbara Ginot, Patrick Baccolo, Giovanni Paleari, Chiara I. Di Stefano, Elena Korotkikh, Elena Introne, Douglas S. Maggi, Valter Garzanti, Eduardo Andò, Sergio Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) 2021 https://insu.hal.science/insu-03706457 https://insu.hal.science/insu-03706457/document https://insu.hal.science/insu-03706457/file/tc-15-1383-2021.pdf https://doi.org/10.5194/tc-15-1383-2021 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-15-1383-2021 insu-03706457 https://insu.hal.science/insu-03706457 https://insu.hal.science/insu-03706457/document https://insu.hal.science/insu-03706457/file/tc-15-1383-2021.pdf BIBCODE: 2021TCry.15.1383L doi:10.5194/tc-15-1383-2021 IRD: fdi:010081118 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://insu.hal.science/insu-03706457 The Cryosphere, 2021, 15, pp.1383-1397. ⟨10.5194/tc-15-1383-2021⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2021 ftinsu https://doi.org/10.5194/tc-15-1383-2021 2024-04-05T00:32:43Z International audience A deeper understanding of past atmospheric circulation variability in the Central Andes is a high-priority topic in paleoclimatology mainly because of the necessity to validate climate models used to predict future precipitation trends and to develop mitigation and/or adaptation strategies for future climate change scenarios in this region. Within this context, we here investigate an 18-year firn core drilled at Nevado Illimani in order to interpret its mineral dust record in relation to seasonal processes, in particular atmospheric circulation and deep convection. The core was dated by annual layer counting based on seasonal oscillations of dust, calcium, and stable isotopes. Geochemical and mineralogical data show that dust is regionally sourced in winter and summer. During austral summer (wet season), an increase in the relative proportion of giant dust particles (∅>20 µm) is observed, in association with oscillations of stable isotope records (δD, δ 18 O). It seems that at Nevado Illimani both the deposition of dust and the isotopic signature of precipitation are influenced by atmospheric deep convection, which is also related to the total amount of precipitation in the area. This hypothesis is corroborated by regional meteorological data. The interpretation of giant particle and stable isotope records suggests that downdrafts due to convective activity promote turbulent conditions capable of suspending giant particles in the vicinity of Nevado Illimani. Giant particles and stable isotopes, when considered together, can be therefore used as a new proxy for obtaining information about deep convective activity in the past. Article in Journal/Newspaper The Cryosphere Institut national des sciences de l'Univers: HAL-INSU The Cryosphere 15 3 1383 1397 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Lindau, Filipe G. L. Simões, Jefferson C. Delmonte, Barbara Ginot, Patrick Baccolo, Giovanni Paleari, Chiara I. Di Stefano, Elena Korotkikh, Elena Introne, Douglas S. Maggi, Valter Garzanti, Eduardo Andò, Sergio Giant dust particles at Nevado Illimani: a proxy of summertime deep convection over the Bolivian Altiplano |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience A deeper understanding of past atmospheric circulation variability in the Central Andes is a high-priority topic in paleoclimatology mainly because of the necessity to validate climate models used to predict future precipitation trends and to develop mitigation and/or adaptation strategies for future climate change scenarios in this region. Within this context, we here investigate an 18-year firn core drilled at Nevado Illimani in order to interpret its mineral dust record in relation to seasonal processes, in particular atmospheric circulation and deep convection. The core was dated by annual layer counting based on seasonal oscillations of dust, calcium, and stable isotopes. Geochemical and mineralogical data show that dust is regionally sourced in winter and summer. During austral summer (wet season), an increase in the relative proportion of giant dust particles (∅>20 µm) is observed, in association with oscillations of stable isotope records (δD, δ 18 O). It seems that at Nevado Illimani both the deposition of dust and the isotopic signature of precipitation are influenced by atmospheric deep convection, which is also related to the total amount of precipitation in the area. This hypothesis is corroborated by regional meteorological data. The interpretation of giant particle and stable isotope records suggests that downdrafts due to convective activity promote turbulent conditions capable of suspending giant particles in the vicinity of Nevado Illimani. Giant particles and stable isotopes, when considered together, can be therefore used as a new proxy for obtaining information about deep convective activity in the past. |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) |
format |
Article in Journal/Newspaper |
author |
Lindau, Filipe G. L. Simões, Jefferson C. Delmonte, Barbara Ginot, Patrick Baccolo, Giovanni Paleari, Chiara I. Di Stefano, Elena Korotkikh, Elena Introne, Douglas S. Maggi, Valter Garzanti, Eduardo Andò, Sergio |
author_facet |
Lindau, Filipe G. L. Simões, Jefferson C. Delmonte, Barbara Ginot, Patrick Baccolo, Giovanni Paleari, Chiara I. Di Stefano, Elena Korotkikh, Elena Introne, Douglas S. Maggi, Valter Garzanti, Eduardo Andò, Sergio |
author_sort |
Lindau, Filipe G. L. |
title |
Giant dust particles at Nevado Illimani: a proxy of summertime deep convection over the Bolivian Altiplano |
title_short |
Giant dust particles at Nevado Illimani: a proxy of summertime deep convection over the Bolivian Altiplano |
title_full |
Giant dust particles at Nevado Illimani: a proxy of summertime deep convection over the Bolivian Altiplano |
title_fullStr |
Giant dust particles at Nevado Illimani: a proxy of summertime deep convection over the Bolivian Altiplano |
title_full_unstemmed |
Giant dust particles at Nevado Illimani: a proxy of summertime deep convection over the Bolivian Altiplano |
title_sort |
giant dust particles at nevado illimani: a proxy of summertime deep convection over the bolivian altiplano |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://insu.hal.science/insu-03706457 https://insu.hal.science/insu-03706457/document https://insu.hal.science/insu-03706457/file/tc-15-1383-2021.pdf https://doi.org/10.5194/tc-15-1383-2021 |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://insu.hal.science/insu-03706457 The Cryosphere, 2021, 15, pp.1383-1397. ⟨10.5194/tc-15-1383-2021⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-15-1383-2021 insu-03706457 https://insu.hal.science/insu-03706457 https://insu.hal.science/insu-03706457/document https://insu.hal.science/insu-03706457/file/tc-15-1383-2021.pdf BIBCODE: 2021TCry.15.1383L doi:10.5194/tc-15-1383-2021 IRD: fdi:010081118 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-15-1383-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
3 |
container_start_page |
1383 |
op_container_end_page |
1397 |
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