Facing unprecedented drying of the Central Andes? Precipitation variability over the period AD 1000–2100
Projected future trends in water availability are associated with large uncertainties in many regions of the globe. In mountain areas with complex topography, climate models have often limited capabilities to adequately simulate the precipitation variability on small spatial scales. Also, their vali...
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ftdoajarticles:oai:doaj.org/article:478b76a6981d480eaa790705c0ef8418 2023-09-05T13:20:10+02:00 Facing unprecedented drying of the Central Andes? Precipitation variability over the period AD 1000–2100 Raphael Neukom Mario Rohrer Pierluigi Calanca Nadine Salzmann Christian Huggel Delia Acuña Duncan A Christie Mariano S Morales 2015-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/10/8/084017 https://doaj.org/article/478b76a6981d480eaa790705c0ef8418 EN eng IOP Publishing https://doi.org/10.1088/1748-9326/10/8/084017 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/10/8/084017 1748-9326 https://doaj.org/article/478b76a6981d480eaa790705c0ef8418 Environmental Research Letters, Vol 10, Iss 8, p 084017 (2015) climate change South America Central Andes precipitation climate projections paleoclimate Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2015 ftdoajarticles https://doi.org/10.1088/1748-9326/10/8/084017 2023-08-13T00:37:54Z Projected future trends in water availability are associated with large uncertainties in many regions of the globe. In mountain areas with complex topography, climate models have often limited capabilities to adequately simulate the precipitation variability on small spatial scales. Also, their validation is hampered by typically very low station density. In the Central Andes of South America, a semi-arid high-mountain region with strong seasonality, zonal wind in the upper troposphere is a good proxy for interannual precipitation variability. Here, we combine instrumental measurements, reanalysis and paleoclimate data, and a 57-member ensemble of CMIP5 model simulations to assess changes in Central Andes precipitation over the period AD 1000–2100. This new database allows us to put future projections of precipitation into a previously missing multi-centennial and pre-industrial context. Our results confirm the relationship between regional summer precipitation and 200 hPa zonal wind in the Central Andes, with stronger Westerly winds leading to decreased precipitation. The period of instrumental coverage (1965–2010) is slightly dryer compared to pre-industrial times as represented by control simulations, simulations from the past Millennium, ice core data from Quelccaya ice cap and a tree-ring based precipitation reconstruction. The model ensemble identifies a clear reduction in precipitation already in the early 21st century: the 10 year running mean model uncertainty range (ensemble 16–84% spread) is continuously above the pre-industrial mean after AD 2023 (AD 2028) until the end of the 21st century in the RCP2.6 (RCP8.5) emission scenario. Average precipitation over AD 2071–2100 is outside the range of natural pre-industrial variability in 47 of the 57 model simulations for both emission scenarios. The ensemble median fraction of dry years (defined by the 5th percentile in pre-industrial conditions) is projected to increase by a factor of 4 until 2071–2100 in the RCP8.5 scenario. Even under the strong ... Article in Journal/Newspaper Ice cap ice core Directory of Open Access Journals: DOAJ Articles Environmental Research Letters 10 8 084017 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
climate change South America Central Andes precipitation climate projections paleoclimate Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
climate change South America Central Andes precipitation climate projections paleoclimate Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Raphael Neukom Mario Rohrer Pierluigi Calanca Nadine Salzmann Christian Huggel Delia Acuña Duncan A Christie Mariano S Morales Facing unprecedented drying of the Central Andes? Precipitation variability over the period AD 1000–2100 |
topic_facet |
climate change South America Central Andes precipitation climate projections paleoclimate Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
Projected future trends in water availability are associated with large uncertainties in many regions of the globe. In mountain areas with complex topography, climate models have often limited capabilities to adequately simulate the precipitation variability on small spatial scales. Also, their validation is hampered by typically very low station density. In the Central Andes of South America, a semi-arid high-mountain region with strong seasonality, zonal wind in the upper troposphere is a good proxy for interannual precipitation variability. Here, we combine instrumental measurements, reanalysis and paleoclimate data, and a 57-member ensemble of CMIP5 model simulations to assess changes in Central Andes precipitation over the period AD 1000–2100. This new database allows us to put future projections of precipitation into a previously missing multi-centennial and pre-industrial context. Our results confirm the relationship between regional summer precipitation and 200 hPa zonal wind in the Central Andes, with stronger Westerly winds leading to decreased precipitation. The period of instrumental coverage (1965–2010) is slightly dryer compared to pre-industrial times as represented by control simulations, simulations from the past Millennium, ice core data from Quelccaya ice cap and a tree-ring based precipitation reconstruction. The model ensemble identifies a clear reduction in precipitation already in the early 21st century: the 10 year running mean model uncertainty range (ensemble 16–84% spread) is continuously above the pre-industrial mean after AD 2023 (AD 2028) until the end of the 21st century in the RCP2.6 (RCP8.5) emission scenario. Average precipitation over AD 2071–2100 is outside the range of natural pre-industrial variability in 47 of the 57 model simulations for both emission scenarios. The ensemble median fraction of dry years (defined by the 5th percentile in pre-industrial conditions) is projected to increase by a factor of 4 until 2071–2100 in the RCP8.5 scenario. Even under the strong ... |
format |
Article in Journal/Newspaper |
author |
Raphael Neukom Mario Rohrer Pierluigi Calanca Nadine Salzmann Christian Huggel Delia Acuña Duncan A Christie Mariano S Morales |
author_facet |
Raphael Neukom Mario Rohrer Pierluigi Calanca Nadine Salzmann Christian Huggel Delia Acuña Duncan A Christie Mariano S Morales |
author_sort |
Raphael Neukom |
title |
Facing unprecedented drying of the Central Andes? Precipitation variability over the period AD 1000–2100 |
title_short |
Facing unprecedented drying of the Central Andes? Precipitation variability over the period AD 1000–2100 |
title_full |
Facing unprecedented drying of the Central Andes? Precipitation variability over the period AD 1000–2100 |
title_fullStr |
Facing unprecedented drying of the Central Andes? Precipitation variability over the period AD 1000–2100 |
title_full_unstemmed |
Facing unprecedented drying of the Central Andes? Precipitation variability over the period AD 1000–2100 |
title_sort |
facing unprecedented drying of the central andes? precipitation variability over the period ad 1000–2100 |
publisher |
IOP Publishing |
publishDate |
2015 |
url |
https://doi.org/10.1088/1748-9326/10/8/084017 https://doaj.org/article/478b76a6981d480eaa790705c0ef8418 |
genre |
Ice cap ice core |
genre_facet |
Ice cap ice core |
op_source |
Environmental Research Letters, Vol 10, Iss 8, p 084017 (2015) |
op_relation |
https://doi.org/10.1088/1748-9326/10/8/084017 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/10/8/084017 1748-9326 https://doaj.org/article/478b76a6981d480eaa790705c0ef8418 |
op_doi |
https://doi.org/10.1088/1748-9326/10/8/084017 |
container_title |
Environmental Research Letters |
container_volume |
10 |
container_issue |
8 |
container_start_page |
084017 |
_version_ |
1776200878466793472 |