Precipitation linked to Atlantic moisture transport : clues to interpret patagonian palaeoclimate

Abstract: Westerlies are the main climatic feature in the mid-latitudes of the Southern Hemisphere (SH), driving the amount and distribution of precipitation. Patagonia is a vast region in South America’s mid-latitudes, which encompasses 2 sub regions with highly distinct precipitation features. The...

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Autores principales: Agosta, Eduardo A., Compagnucci, Rosa, Aristegui, Daniel
Formato: Artículo
Lenguaje:Inglés
Publicado: Inter-Research Science Center 2019
Materias:
HEMISFERIO SUR
VIENTO
LAGOS
CLIMATOLOGIA
PRECIPITACIONES
Acceso en línea:https://repositorio.uca.edu.ar/handle/123456789/5455
Aporte de:
Aportado por : Repositorio Institucional de la Universidad Católica Argentina (UCA) de Universidad Católica Argentina .
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id I33-R139123456789-5455
record_format dspace
spelling I33-R139123456789-54552021-09-10T18:11:23Z Precipitation linked to Atlantic moisture transport : clues to interpret patagonian palaeoclimate Agosta, Eduardo A. Compagnucci, Rosa Aristegui, Daniel HEMISFERIO SUR VIENTO LAGOS CLIMATOLOGIA PRECIPITACIONES Abstract: Westerlies are the main climatic feature in the mid-latitudes of the Southern Hemisphere (SH), driving the amount and distribution of precipitation. Patagonia is a vast region in South America’s mid-latitudes, which encompasses 2 sub regions with highly distinct precipitation features. These two regions include wet Western Patagonia extending from the Pacific coast to the Andean highs (i.e. maximum elevations), and dry Eastern Patagonia situated leeward of the Andes in the Argentine steppe plains. Patagonia is influenced by strong mid-latitude westerlies throughout the year. Westerlies have been considered the unique driver of climate both in Western and Eastern Pata gonia. This research is focused on the Lago Cardiel catchment area in central Eastern Patagonia. A significant link between precipitation in that region and local zonal moisture transport from the Atlantic was established. A fraction of intense precipitation was related to strong local westward moisture transport, partly as a consequence of slow-moving weather systems crossing over Patagonia. As long as a dipolar pattern of long-term precipitation anomaly was observed between dry central Western/Southern Patagonia and wet central Eastern Patagonia, it could be interpreted as due to enhanced synoptic easterly moisture flux from the Atlantic. Thus, the westerlies rule was broken at least under blocking-like flows, which induced moist easterlies. The relatively wet 1940s exemplified this phenomenon. Such a conceptual framework can be applied to palaeoclimatic proxy record reconstructions as well as to general circulation model (GCM) outcomes for the late and mid-Holocene 2019-06-06T00:48:21Z 2019-06-06T00:48:21Z 2015 Artículo Agosta, E., Compagnucci, R., Ariztegui, D. Precipitation linked to Atlantic moisture transport : clues to interpret patagonian palaeoclimate [en línea]. Climate research 62, 2015. Disponible en: https://repositorio.uca.edu.ar/handle/123456789/5455 1616-1572 https://repositorio.uca.edu.ar/handle/123456789/5455 eng Acceso Abierto https://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf PATAGONIA ARGENTINA Inter-Research Science Center Climate Research Vol. 62, 2015 ISSN 1616-1572
institution Universidad Católica Argentina
institution_str I-33
repository_str R-139
collection Repositorio Institucional de la Universidad Católica Argentina (UCA)
language Inglés
topic HEMISFERIO SUR
VIENTO
LAGOS
CLIMATOLOGIA
PRECIPITACIONES
spellingShingle HEMISFERIO SUR
VIENTO
LAGOS
CLIMATOLOGIA
PRECIPITACIONES
Agosta, Eduardo A.
Compagnucci, Rosa
Aristegui, Daniel
Precipitation linked to Atlantic moisture transport : clues to interpret patagonian palaeoclimate
topic_facet HEMISFERIO SUR
VIENTO
LAGOS
CLIMATOLOGIA
PRECIPITACIONES
description Abstract: Westerlies are the main climatic feature in the mid-latitudes of the Southern Hemisphere (SH), driving the amount and distribution of precipitation. Patagonia is a vast region in South America’s mid-latitudes, which encompasses 2 sub regions with highly distinct precipitation features. These two regions include wet Western Patagonia extending from the Pacific coast to the Andean highs (i.e. maximum elevations), and dry Eastern Patagonia situated leeward of the Andes in the Argentine steppe plains. Patagonia is influenced by strong mid-latitude westerlies throughout the year. Westerlies have been considered the unique driver of climate both in Western and Eastern Pata gonia. This research is focused on the Lago Cardiel catchment area in central Eastern Patagonia. A significant link between precipitation in that region and local zonal moisture transport from the Atlantic was established. A fraction of intense precipitation was related to strong local westward moisture transport, partly as a consequence of slow-moving weather systems crossing over Patagonia. As long as a dipolar pattern of long-term precipitation anomaly was observed between dry central Western/Southern Patagonia and wet central Eastern Patagonia, it could be interpreted as due to enhanced synoptic easterly moisture flux from the Atlantic. Thus, the westerlies rule was broken at least under blocking-like flows, which induced moist easterlies. The relatively wet 1940s exemplified this phenomenon. Such a conceptual framework can be applied to palaeoclimatic proxy record reconstructions as well as to general circulation model (GCM) outcomes for the late and mid-Holocene
format Artículo
author Agosta, Eduardo A.
Compagnucci, Rosa
Aristegui, Daniel
author_facet Agosta, Eduardo A.
Compagnucci, Rosa
Aristegui, Daniel
author_sort Agosta, Eduardo A.
title Precipitation linked to Atlantic moisture transport : clues to interpret patagonian palaeoclimate
title_short Precipitation linked to Atlantic moisture transport : clues to interpret patagonian palaeoclimate
title_full Precipitation linked to Atlantic moisture transport : clues to interpret patagonian palaeoclimate
title_fullStr Precipitation linked to Atlantic moisture transport : clues to interpret patagonian palaeoclimate
title_full_unstemmed Precipitation linked to Atlantic moisture transport : clues to interpret patagonian palaeoclimate
title_sort precipitation linked to atlantic moisture transport : clues to interpret patagonian palaeoclimate
publisher Inter-Research Science Center
publishDate 2019
url https://repositorio.uca.edu.ar/handle/123456789/5455
work_keys_str_mv AT agostaeduardoa precipitationlinkedtoatlanticmoisturetransportcluestointerpretpatagonianpalaeoclimate
AT compagnuccirosa precipitationlinkedtoatlanticmoisturetransportcluestointerpretpatagonianpalaeoclimate
AT aristeguidaniel precipitationlinkedtoatlanticmoisturetransportcluestointerpretpatagonianpalaeoclimate
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