Atmospheric circulation over Patagonia from the Jurassic to present: a review through proxy data and climatic modelling scenarios

Compagnucci, Rosa Hilda

doi:10.1111/j.1095-8312.2011.01655.x

Cited by 44 publications

(46 citation statements)

References 135 publications

(181 reference statements)

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“…1). This latitudinal range falls within the area of influence of the westerlies, which have been the main forcing of the climate of Patagonia as it reached its present geographical position in the late Miocene (Compagnucci, 2011). Were their flux unimpeded, the westerlies would be solely responsible for precipitation patterns over the Patagonian region through the advection of moist air from the Pacific Ocean.…”

Section: Study Areamentioning

confidence: 87%

Patagonian ostracods as indicators of climate-related hydrological variables: implications for paleoenvironmental reconstructions in Southern South America

et al. 2012

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Different precipitation regimes across Patagonia generate an environmental gradient that is expected to reflect upon the solute composition and concentration of lake water through the ensuing differences in water balance. In turn, this hydrochemical gradient could influence the occurrence and distribution of ostracods in the area. A cluster analysis on hydrochemical data of 36 Southern Patagonian waterbodies shows that low salinity, bicarbonatedominated waters characterize Andean and ecotonal lakes, located in the wetter part of the precipitation gradient, while their steppe counterparts, which receive a much lower precipitation input, are more saline, enriched in all major anions and sodiumdominated. Kruskal-Wallis tests followed by MannWhitney pairwise comparisons show statistically significant differences in the ostracod species each water type hosts, with L. patagonica, E. cecryphalium, P. smaragdina and P. incae being found in the more dilute waters characteristic of Andean and ecotonal lakes and Limnocythere rionegroensis in the mesohaline, evaporatively evolved waters typical of steppe lakes. Other species studied do not appear to have such distinct distributions, having been found throughout the range of conditions studied. These findings promote the use of the aforementioned ostracods as semi-quantitative paleohydrological indicators, which could improve paleoclimatic reconstructions in Patagonia.

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Section: Study Areamentioning

confidence: 87%

Patagonian ostracods as indicators of climate-related hydrological variables: implications for paleoenvironmental reconstructions in Southern South America

et al. 2012

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“…JURASSIC CLIMATE AND PHYTOGEOGRAPHIC PATTERNS Compagnucci (2011) mentions that Patagonia was situated mostly within the paleolatitudes infl uenced by the wind system of the westerlies during the last 250 Ma. In her Rosenfeld & Volkheimer, 1979).…”

Section: Neuquén Basinmentioning

confidence: 99%

“…-PROXIES FOR THE CAÑADÓN ASFALTO AND NEUQUÉN BASINS, ARGENTINA own words: "That explains the low frequency of climatic changes. During most of the Mesozoic, the continental mass (as Pangaea was fractured and dismembered) remained far from the poles, thus resulting in large periods of warm climate, without polar ice caps" (Compagnucci, 2011).…”

Section: Neuquén Basinmentioning

confidence: 99%

Environmental and climatic proxies for the Cañadón Asfalto and Neuquén basins (Patagonia, Argentina): review of Middle to Upper Jurassic continental and near coastal sequences

Volkheimer

Quattrocchio

Cabaleri

et al. 2015

Rev. bras. paleontol.

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-In this review, we include several proxies (sedimentology, palynology, invertebrates) from the Cañadón Asfalto and Neuquén basins, to infer the environments and regional climatic context during the Middle to Late Jurassic of Patagonia. In central Patagonia, early in the Middle Jurassic, and associated with a magmatic arc, began the sedimentary fi lling of Jurassic continental sub-basins in the Cañadón Asfalto Basin. Lacustrine and fl uvio-deltaic sediments, bearing a continental Middle Jurassic palynobiota, correspond to the Las Chacritas Member, while the sediments and palynobiota from the Late Jurassic Puesto Almada Member (both in the Cañadón Asfalto Formation) indicate a palustrine wetland subenvironment immersed within an arid macroenvironment. Paleoinvertebrates (conchostracans and sponges) of this formation suggest wet-dry cycles in the water bodies they inhabited. The sedimentological information together with the continental and coastal palynomorph assemblages of the back arc Neuquén Basin, allowed distinguishing a complete regressive-transgressive sequence for the Middle Jurassic Lajas Formation. For the Upper Jurassic in this basin, the thick gypsum and anhydrite deposits of the evaporitic coastal Auquilco Formation correlate with extended deposits of eolian sandstones corresponding to the Botucatú paleodesert, and a saltmarsh environment is inferred from the palynofl ora. The palynologic associations from both basins indicate a regional warm climate with seasonal aridity. Climatic conditions would have been drier in the continental interior (Cañadón Asfalto Basin), with strongly seasonally distributed temperatures, and moister in the western coast of the continent (Neuquén Basin), during the marine transgressions.Key words: paleoenvironment, paleoclimate, Jurassic, Cañadón Asfalto Basin, Neuquén Basin, Argentina.RESUMO -Na presente revisão foram incluídos vários proxies (sedimentologia, palinologia, invertebrados), das bacias de Cañadón Asfalto e Neuquén, para inferir o contexto climático regional e ambiental durante o Jurássico Médio e Superior da Patagônia. Na região central da Patagônia, no início do Jurássico Médio, e associado a um arco magmático, começou o preenchimento sedimentar de sub-bacias continentais jurássicas na bacia Cañadón Asfalto. Os sedimentos fl úvio-deitaico e lacustres, tendo uma palinobiota continental do Jurássico Médio correspondente ao Membro Las Chacritas, enquanto os sedimentos e a palinobiota do Jurássico Superior do Membro Puesto Almada (ambos na Formação Cañadón Asfalto) indicam um subambiente palustre úmido imerso em um macroambiente árido. Os paleoinvertebrados (conchostráceos e esponjas) desta formação sugerem ciclos úmidos-secos nos corpos de água por eles habitados. A informação sedimentológica juntamente com 72

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“…5a3 and 5b3). The structure of circulation in the lower troposphere corresponds to the pattern described by Rutllant and Fuenzalida (1991) and Compagnucci and Vargas (1998) associated with abundant and frequent snowfalls over the central Andes the winter after an El Niñ o year.…”

Section: ) Patternmentioning

confidence: 76%

“…Moreover, Garreaud (2007) showed negative (positive) correlations between the 850-hPa zonal wind and the monthly precipitation over the east (west) side of southern Andes, meaning that precipitation decreases (increases) with intensified westerly flow at the Argentinean (Chilean) side and vice versa [see also Fig. 13 in Compagnucci (2011), provided by R. D. Garreaud 2011, personal communication]. Easterly winds and advection of moisture from the adjacent areas of the Atlantic Ocean can also produce daily precipitation over EPAT (e.g., Mayr et al 2007a,b).…”

Section: Introductionmentioning

confidence: 99%

Eastern Patagonia Seasonal Precipitation: Influence of Southern Hemisphere Circulation and Links with Subtropical South American Precipitation

2012

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Some aspects of the seasonal precipitation over eastern Patagonia, the southernmost area of South America east of the Andes Cordillera, are examined in this paper. Results indicate that the central-north areas, the southern continental region, and the southernmost islands are three independent regions of seasonal precipitation, and that each of them is associated with specific patterns of atmospheric circulation. Precipitation over the central-north region is significantly related to the precipitation over a wide area of southern South America east of the Andes during the four seasons. Enhanced (reduced) precipitation over this area is associated with weakened (intensified) westerly flow in the region. Precipitation over the southern continental area has a close connection with the dipolar pattern of precipitation over subtropical South America during spring, summer, and autumn. The anomalies of atmospheric circulation at low and upper levels associated with the subtropical dipole are also able to modulate the intensity of the westerlies over the south of eastern Patagonia, affecting the regional precipitation. Precipitation over the islands of the southernmost part of eastern Patagonia is connected with subtropical precipitation in summer and winter. The activity of frontal systems associated with migratory perturbations moving to the east along the Southern Hemisphere storm tracks modulates the variability of seasonal precipitation over this region.

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Atmospheric circulation over Patagonia from the Jurassic to present: a review through proxy data and climatic modelling scenarios

Cited by 44 publications

References 135 publications

Patagonian ostracods as indicators of climate-related hydrological variables: implications for paleoenvironmental reconstructions in Southern South America

Patagonian ostracods as indicators of climate-related hydrological variables: implications for paleoenvironmental reconstructions in Southern South America

Environmental and climatic proxies for the Cañadón Asfalto and Neuquén basins (Patagonia, Argentina): review of Middle to Upper Jurassic continental and near coastal sequences

Eastern Patagonia Seasonal Precipitation: Influence of Southern Hemisphere Circulation and Links with Subtropical South American Precipitation

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