Giant dust particles at Nevado Illimani: A proxy of summertime deep convection over the Bolivian Altiplano
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 futur...
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2021
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Online Access: | http://hdl.handle.net/10281/310312 https://doi.org/10.5194/tc-15-1383-2021 |
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ftunivmilanobic:oai:boa.unimib.it:10281/310312 2024-04-14T08:13:06+00:00 Giant dust particles at Nevado Illimani: A proxy of summertime deep convection over the Bolivian Altiplano Lindau F. G. L. Simoes J. C. Delmonte B. Ginot P. Baccolo G. Paleari C. I. Di Stefano E. Korotkikh E. Introne D. S. Maggi V. Garzanti E. Ando' S. Lindau, F Simoes, J Delmonte, B Ginot, P Baccolo, G Paleari, C Di Stefano, E Korotkikh, E Introne, D Maggi, V Garzanti, E Ando', S 2021 http://hdl.handle.net/10281/310312 https://doi.org/10.5194/tc-15-1383-2021 eng eng Copernicus GmbH country:DE info:eu-repo/semantics/altIdentifier/wos/WOS:000630205400001 volume:15 issue:3 firstpage:1383 lastpage:1397 numberofpages:15 journal:THE CRYOSPHERE http://hdl.handle.net/10281/310312 doi:10.5194/tc-15-1383-2021 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85102859485 ice core atmospheric mineral dust provenance climate atmospheric processes geochemical fingerprint Andean glacier info:eu-repo/semantics/article 2021 ftunivmilanobic https://doi.org/10.5194/tc-15-1383-2021 2024-03-21T17:19:31Z 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 um) is observed, in association with oscillations of stable isotope records (D, 18O). 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 ice core Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) Austral The Cryosphere 15 3 1383 1397 |
institution |
Open Polar |
collection |
Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) |
op_collection_id |
ftunivmilanobic |
language |
English |
topic |
ice core atmospheric mineral dust provenance climate atmospheric processes geochemical fingerprint Andean glacier |
spellingShingle |
ice core atmospheric mineral dust provenance climate atmospheric processes geochemical fingerprint Andean glacier Lindau F. G. L. Simoes J. C. Delmonte B. Ginot P. Baccolo G. Paleari C. I. Di Stefano E. Korotkikh E. Introne D. S. Maggi V. Garzanti E. Ando' S. Giant dust particles at Nevado Illimani: A proxy of summertime deep convection over the Bolivian Altiplano |
topic_facet |
ice core atmospheric mineral dust provenance climate atmospheric processes geochemical fingerprint Andean glacier |
description |
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 um) is observed, in association with oscillations of stable isotope records (D, 18O). 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 |
Lindau, F Simoes, J Delmonte, B Ginot, P Baccolo, G Paleari, C Di Stefano, E Korotkikh, E Introne, D Maggi, V Garzanti, E Ando', S |
format |
Article in Journal/Newspaper |
author |
Lindau F. G. L. Simoes J. C. Delmonte B. Ginot P. Baccolo G. Paleari C. I. Di Stefano E. Korotkikh E. Introne D. S. Maggi V. Garzanti E. Ando' S. |
author_facet |
Lindau F. G. L. Simoes J. C. Delmonte B. Ginot P. Baccolo G. Paleari C. I. Di Stefano E. Korotkikh E. Introne D. S. Maggi V. Garzanti E. Ando' S. |
author_sort |
Lindau F. 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 |
Copernicus GmbH |
publishDate |
2021 |
url |
http://hdl.handle.net/10281/310312 https://doi.org/10.5194/tc-15-1383-2021 |
geographic |
Austral |
geographic_facet |
Austral |
genre |
ice core |
genre_facet |
ice core |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000630205400001 volume:15 issue:3 firstpage:1383 lastpage:1397 numberofpages:15 journal:THE CRYOSPHERE http://hdl.handle.net/10281/310312 doi:10.5194/tc-15-1383-2021 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85102859485 |
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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1796311019832737792 |