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...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2021
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-15-1383-2021 https://noa.gwlb.de/receive/cop_mods_00055933 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055584/tc-15-1383-2021.pdf https://tc.copernicus.org/articles/15/1383/2021/tc-15-1383-2021.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00055933 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00055933 2024-09-15T18:39:00+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 2021-03 electronic https://doi.org/10.5194/tc-15-1383-2021 https://noa.gwlb.de/receive/cop_mods_00055933 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055584/tc-15-1383-2021.pdf https://tc.copernicus.org/articles/15/1383/2021/tc-15-1383-2021.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-1383-2021 https://noa.gwlb.de/receive/cop_mods_00055933 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055584/tc-15-1383-2021.pdf https://tc.copernicus.org/articles/15/1383/2021/tc-15-1383-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/tc-15-1383-2021 2024-06-26T04:41:37Z 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, δ18O). 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 Niedersächsisches Online-Archiv NOA The Cryosphere 15 3 1383 1397 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung 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 |
article Verlagsveröffentlichung |
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 µm) is observed, in association with oscillations of stable isotope records (δD, δ18O). 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. |
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 |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-1383-2021 https://noa.gwlb.de/receive/cop_mods_00055933 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055584/tc-15-1383-2021.pdf https://tc.copernicus.org/articles/15/1383/2021/tc-15-1383-2021.pdf |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-1383-2021 https://noa.gwlb.de/receive/cop_mods_00055933 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055584/tc-15-1383-2021.pdf https://tc.copernicus.org/articles/15/1383/2021/tc-15-1383-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt 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 |
_version_ |
1810483387950956544 |