Weather regimes linked to daily precipitation anomalies in northern Chile
Northern Chile is one of the most arid regions in the world, with precipitation mainly occurring during austral summer, between December and April. The aim of this study is to classify the main weather regimes derived from sea level pressure, surface wind speed, 500 or 250 hPa geopotential heights,...
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ftunivchile:oai:repositorio.uchile.cl:2250/175000 2023-05-15T14:01:29+02:00 Weather regimes linked to daily precipitation anomalies in northern Chile Meseguer Ruiz, Oliver Cortesi, Nicola Guijarro, José Sarricolea Espinoza, Pablo 2020 application/pdf https://doi.org/10.1016/j.atmosres.2019.104802 https://repositorio.uchile.cl/handle/2250/175000 en eng Elsevier Atmospheric Research 236 (2020) 104802 doi:10.1016/j.atmosres.2019.104802 https://repositorio.uchile.cl/handle/2250/175000 Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ CC-BY-NC-ND Atmospheric Research Weather regimes Northern Chile Altiplano Atacama Desert Geopotential height Megadrought Artículo de revista 2020 ftunivchile https://doi.org/10.1016/j.atmosres.2019.104802 2022-12-25T00:50:39Z Northern Chile is one of the most arid regions in the world, with precipitation mainly occurring during austral summer, between December and April. The aim of this study is to classify the main weather regimes derived from sea level pressure, surface wind speed, 500 or 250 hPa geopotential heights, in order to measure their influence on precipitation anomalies and determine if they can be considered sources of predictability of rainfall in this region. Four weather regimes were found to optimally describe atmospheric circulation in the study area during 1966-2015 and for each of the four levels described above. Using daily precipitation data from a network of 161 meteorological stations across the region, the rainfall anomalies associated with each weather regime were quantified. They are coherent with the direction of flow derived from pressure and geopotential anomalies, bringing humid air masses from the Amazon Basin or the Pacific. The transitions between the different regimes are also coherent, representing transitions to and from similar regimes. A few negative and significant trends in the persistence of different regimes were detected, most likely linked to the absence of anthropogenic warming in the Antarctic as opposed to the Arctic. Finally, two of the regimes derived from surface wind speed exhibit a negative and significant trend in its frequency of occurrence, determining a precipitation decrease in the south of the study area (28-30 degrees S), which can be compared with the Megadrought experienced in central Chile. Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) CONICYT FONDECYT 11160059 Climatology Group 2017 SGR 1362 Spanish Ministry of Economy and Competitiveness (MINECO) as part of the Juan de la Cierva - Incorporacion grant BOE-A-2010-3694 New European Wind Atlas (NEWA) project PCIN-2016-029 Subseasonal to Seasonal for Energy (S2S4E) project H2020-SC5-2016-2017 CLICES Project CGL2017-83866-C3-2-R Article in Journal/Newspaper Antarc* Antarctic Arctic Universidad de Chile: Repositorio académico Antarctic Arctic Austral Cierva ENVELOPE(-60.873,-60.873,-64.156,-64.156) Pacific The Antarctic Atmospheric Research 236 104802 |
institution |
Open Polar |
collection |
Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
language |
English |
topic |
Weather regimes Northern Chile Altiplano Atacama Desert Geopotential height Megadrought |
spellingShingle |
Weather regimes Northern Chile Altiplano Atacama Desert Geopotential height Megadrought Meseguer Ruiz, Oliver Cortesi, Nicola Guijarro, José Sarricolea Espinoza, Pablo Weather regimes linked to daily precipitation anomalies in northern Chile |
topic_facet |
Weather regimes Northern Chile Altiplano Atacama Desert Geopotential height Megadrought |
description |
Northern Chile is one of the most arid regions in the world, with precipitation mainly occurring during austral summer, between December and April. The aim of this study is to classify the main weather regimes derived from sea level pressure, surface wind speed, 500 or 250 hPa geopotential heights, in order to measure their influence on precipitation anomalies and determine if they can be considered sources of predictability of rainfall in this region. Four weather regimes were found to optimally describe atmospheric circulation in the study area during 1966-2015 and for each of the four levels described above. Using daily precipitation data from a network of 161 meteorological stations across the region, the rainfall anomalies associated with each weather regime were quantified. They are coherent with the direction of flow derived from pressure and geopotential anomalies, bringing humid air masses from the Amazon Basin or the Pacific. The transitions between the different regimes are also coherent, representing transitions to and from similar regimes. A few negative and significant trends in the persistence of different regimes were detected, most likely linked to the absence of anthropogenic warming in the Antarctic as opposed to the Arctic. Finally, two of the regimes derived from surface wind speed exhibit a negative and significant trend in its frequency of occurrence, determining a precipitation decrease in the south of the study area (28-30 degrees S), which can be compared with the Megadrought experienced in central Chile. Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) CONICYT FONDECYT 11160059 Climatology Group 2017 SGR 1362 Spanish Ministry of Economy and Competitiveness (MINECO) as part of the Juan de la Cierva - Incorporacion grant BOE-A-2010-3694 New European Wind Atlas (NEWA) project PCIN-2016-029 Subseasonal to Seasonal for Energy (S2S4E) project H2020-SC5-2016-2017 CLICES Project CGL2017-83866-C3-2-R |
format |
Article in Journal/Newspaper |
author |
Meseguer Ruiz, Oliver Cortesi, Nicola Guijarro, José Sarricolea Espinoza, Pablo |
author_facet |
Meseguer Ruiz, Oliver Cortesi, Nicola Guijarro, José Sarricolea Espinoza, Pablo |
author_sort |
Meseguer Ruiz, Oliver |
title |
Weather regimes linked to daily precipitation anomalies in northern Chile |
title_short |
Weather regimes linked to daily precipitation anomalies in northern Chile |
title_full |
Weather regimes linked to daily precipitation anomalies in northern Chile |
title_fullStr |
Weather regimes linked to daily precipitation anomalies in northern Chile |
title_full_unstemmed |
Weather regimes linked to daily precipitation anomalies in northern Chile |
title_sort |
weather regimes linked to daily precipitation anomalies in northern chile |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://doi.org/10.1016/j.atmosres.2019.104802 https://repositorio.uchile.cl/handle/2250/175000 |
long_lat |
ENVELOPE(-60.873,-60.873,-64.156,-64.156) |
geographic |
Antarctic Arctic Austral Cierva Pacific The Antarctic |
geographic_facet |
Antarctic Arctic Austral Cierva Pacific The Antarctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
Atmospheric Research |
op_relation |
Atmospheric Research 236 (2020) 104802 doi:10.1016/j.atmosres.2019.104802 https://repositorio.uchile.cl/handle/2250/175000 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.atmosres.2019.104802 |
container_title |
Atmospheric Research |
container_volume |
236 |
container_start_page |
104802 |
_version_ |
1766271334081363968 |