Precipitation linked to Atlantic moisture transport: Clues to interpret Patagonian palaeoclimate

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 tw...

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Detalles Bibliográficos
Autores principales: Agosta, E., Compagnucci, R., Ariztegui, D.
Formato: JOUR
Materias:
Blocking flow
Lakes
Patagonia
Southern Hemisphere
Synoptic-climatology
Westerlies
climate variation
moisture transfer
paleoclimate
precipitation (climatology)
proxy climate record
steppe
westerly
Andes
Argentina
Pacific Coast [South America]
Gonia
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0936577X_v62_n3_p219_Agosta
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_0936577X_v62_n3_p219_Agosta
record_format dspace
spelling todo:paper_0936577X_v62_n3_p219_Agosta2023-10-03T15:48:39Z Precipitation linked to Atlantic moisture transport: Clues to interpret Patagonian palaeoclimate Agosta, E. Compagnucci, R. Ariztegui, D. Blocking flow Lakes Patagonia Southern Hemisphere Synoptic-climatology Westerlies climate variation moisture transfer paleoclimate precipitation (climatology) proxy climate record Southern Hemisphere steppe westerly Andes Argentina Pacific Coast [South America] Patagonia Gonia 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. © Inter-Research 2015. Fil:Compagnucci, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0936577X_v62_n3_p219_Agosta
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Blocking flow
Lakes
Patagonia
Southern Hemisphere
Synoptic-climatology
Westerlies
climate variation
moisture transfer
paleoclimate
precipitation (climatology)
proxy climate record
Southern Hemisphere
steppe
westerly
Andes
Argentina
Pacific Coast [South America]
Patagonia
Gonia
spellingShingle Blocking flow
Lakes
Patagonia
Southern Hemisphere
Synoptic-climatology
Westerlies
climate variation
moisture transfer
paleoclimate
precipitation (climatology)
proxy climate record
Southern Hemisphere
steppe
westerly
Andes
Argentina
Pacific Coast [South America]
Patagonia
Gonia
Agosta, E.
Compagnucci, R.
Ariztegui, D.
Precipitation linked to Atlantic moisture transport: Clues to interpret Patagonian palaeoclimate
topic_facet Blocking flow
Lakes
Patagonia
Southern Hemisphere
Synoptic-climatology
Westerlies
climate variation
moisture transfer
paleoclimate
precipitation (climatology)
proxy climate record
Southern Hemisphere
steppe
westerly
Andes
Argentina
Pacific Coast [South America]
Patagonia
Gonia
description 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. © Inter-Research 2015.
format JOUR
author Agosta, E.
Compagnucci, R.
Ariztegui, D.
author_facet Agosta, E.
Compagnucci, R.
Ariztegui, D.
author_sort Agosta, E.
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
url http://hdl.handle.net/20.500.12110/paper_0936577X_v62_n3_p219_Agosta
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AT compagnuccir precipitationlinkedtoatlanticmoisturetransportcluestointerpretpatagonianpalaeoclimate
AT arizteguid precipitationlinkedtoatlanticmoisturetransportcluestointerpretpatagonianpalaeoclimate
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