Accumulation rate in a tropical Andean glacier as a proxy for northern Amazon precipitation
International audience Andean tropical glaciers have shown a clear shrinkage throughout the last few decades. However, it is unclear how this general retreat is associated with variations in rainfall patterns in the Amazon basin. To investigate this question, we compared the annual net accumulation...
Published in: | Theoretical and Applied Climatology |
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Online Access: | https://hal.umontpellier.fr/hal-02070563 https://doi.org/10.1007/s00704-017-2108-7 |
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ftunivnantes:oai:HAL:hal-02070563v1 2023-05-15T16:38:47+02:00 Accumulation rate in a tropical Andean glacier as a proxy for northern Amazon precipitation da Rocha Ribeiro, Rafael Simões, Jefferson Cardia Ramirez, Edson Taupin, J.D. Assayag, Elias Dani, Norberto Universidade Federal do Rio Grande do Sul Porto Alegre (UFRGS) Universidad Mayor de San Andrés (UMSA) Hydrosciences Montpellier (HSM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) Universidade Federal de Manaus 2018-04 https://hal.umontpellier.fr/hal-02070563 https://doi.org/10.1007/s00704-017-2108-7 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00704-017-2108-7 hal-02070563 https://hal.umontpellier.fr/hal-02070563 doi:10.1007/s00704-017-2108-7 ISSN: 0177-798X EISSN: 1434-4483 Theoretical and Applied Climatology https://hal.umontpellier.fr/hal-02070563 Theoretical and Applied Climatology, Springer Verlag, 2018, 132 (1-2), pp.569-578. ⟨10.1007/s00704-017-2108-7⟩ [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2018 ftunivnantes https://doi.org/10.1007/s00704-017-2108-7 2022-08-10T05:31:17Z International audience Andean tropical glaciers have shown a clear shrinkage throughout the last few decades. However, it is unclear how this general retreat is associated with variations in rainfall patterns in the Amazon basin. To investigate this question, we compared the annual net accumulation variations in the Bolivian Cordillera Real (Andes), which is derived from an ice core from the Nevado Illimani (16° 37′ S, 67° 46′ W), covering the period 1960–1999 using the Amazonian Rainfall Index, Northern Atlantic Index (TNA), Multivariate ENSO Index (MEI), and Pacific Decadal Oscillation (PDO). The accumulation rate at the Nevado Illimani ice core decreased by almost 25% after 1980, from 1.02 w.eq. a−1 (water equivalent per year) in the 1961–1981 period to 0.76 w.eq. a−1 in the 1981–1999 period. The Northern Amazonian Rainfall (NAR) index best reflects changes in accumulation rates in the Bolivian ice core. Our proposal is based on two observations: (1) This area shows reduced rainfall associated with a more frequent and intense El Niño (during the positive phase of the MEI). The opposite (more rain) is true during La Niña phases. (2) Comparisons of the ice core record and NAR, PDO, and MEI indexes showed similar trends for the early 1980s, represented by a decrease in the accumulation rates and its standard deviations, probably indicating the same causality. The general changes observed by early 1980s coincided with the beginning of a PDO warm phase. This was followed by an increase in the Amazonian and tropical Andean precipitation from 1999, coinciding with a new PDO phase. However, this increase did not result in an expansion of the Zongo Glacier area. Article in Journal/Newspaper ice core Université de Nantes: HAL-UNIV-NANTES Pacific Theoretical and Applied Climatology 132 1-2 569 578 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology da Rocha Ribeiro, Rafael Simões, Jefferson Cardia Ramirez, Edson Taupin, J.D. Assayag, Elias Dani, Norberto Accumulation rate in a tropical Andean glacier as a proxy for northern Amazon precipitation |
topic_facet |
[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience Andean tropical glaciers have shown a clear shrinkage throughout the last few decades. However, it is unclear how this general retreat is associated with variations in rainfall patterns in the Amazon basin. To investigate this question, we compared the annual net accumulation variations in the Bolivian Cordillera Real (Andes), which is derived from an ice core from the Nevado Illimani (16° 37′ S, 67° 46′ W), covering the period 1960–1999 using the Amazonian Rainfall Index, Northern Atlantic Index (TNA), Multivariate ENSO Index (MEI), and Pacific Decadal Oscillation (PDO). The accumulation rate at the Nevado Illimani ice core decreased by almost 25% after 1980, from 1.02 w.eq. a−1 (water equivalent per year) in the 1961–1981 period to 0.76 w.eq. a−1 in the 1981–1999 period. The Northern Amazonian Rainfall (NAR) index best reflects changes in accumulation rates in the Bolivian ice core. Our proposal is based on two observations: (1) This area shows reduced rainfall associated with a more frequent and intense El Niño (during the positive phase of the MEI). The opposite (more rain) is true during La Niña phases. (2) Comparisons of the ice core record and NAR, PDO, and MEI indexes showed similar trends for the early 1980s, represented by a decrease in the accumulation rates and its standard deviations, probably indicating the same causality. The general changes observed by early 1980s coincided with the beginning of a PDO warm phase. This was followed by an increase in the Amazonian and tropical Andean precipitation from 1999, coinciding with a new PDO phase. However, this increase did not result in an expansion of the Zongo Glacier area. |
author2 |
Universidade Federal do Rio Grande do Sul Porto Alegre (UFRGS) Universidad Mayor de San Andrés (UMSA) Hydrosciences Montpellier (HSM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) Universidade Federal de Manaus |
format |
Article in Journal/Newspaper |
author |
da Rocha Ribeiro, Rafael Simões, Jefferson Cardia Ramirez, Edson Taupin, J.D. Assayag, Elias Dani, Norberto |
author_facet |
da Rocha Ribeiro, Rafael Simões, Jefferson Cardia Ramirez, Edson Taupin, J.D. Assayag, Elias Dani, Norberto |
author_sort |
da Rocha Ribeiro, Rafael |
title |
Accumulation rate in a tropical Andean glacier as a proxy for northern Amazon precipitation |
title_short |
Accumulation rate in a tropical Andean glacier as a proxy for northern Amazon precipitation |
title_full |
Accumulation rate in a tropical Andean glacier as a proxy for northern Amazon precipitation |
title_fullStr |
Accumulation rate in a tropical Andean glacier as a proxy for northern Amazon precipitation |
title_full_unstemmed |
Accumulation rate in a tropical Andean glacier as a proxy for northern Amazon precipitation |
title_sort |
accumulation rate in a tropical andean glacier as a proxy for northern amazon precipitation |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.umontpellier.fr/hal-02070563 https://doi.org/10.1007/s00704-017-2108-7 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
ice core |
genre_facet |
ice core |
op_source |
ISSN: 0177-798X EISSN: 1434-4483 Theoretical and Applied Climatology https://hal.umontpellier.fr/hal-02070563 Theoretical and Applied Climatology, Springer Verlag, 2018, 132 (1-2), pp.569-578. ⟨10.1007/s00704-017-2108-7⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00704-017-2108-7 hal-02070563 https://hal.umontpellier.fr/hal-02070563 doi:10.1007/s00704-017-2108-7 |
op_doi |
https://doi.org/10.1007/s00704-017-2108-7 |
container_title |
Theoretical and Applied Climatology |
container_volume |
132 |
container_issue |
1-2 |
container_start_page |
569 |
op_container_end_page |
578 |
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1766029127535558656 |