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Abstract:

Recent airborne pollen records data from Northern Patagonia (San Carlos de Bariloche, Argentina, Lat. 41.1435°S, Long. 71.375°W, 800m elevation) suggest that pollen transport takes place from the west to the east slope of the Andes. However, the atmospheric characteristics responsible of this transport have not yet been studied. The aim of this paper is to assess potential source areas and to describe the involved atmospheric mechanisms of the trans- Andean pollen transport. Methodology relies on the analysis of backward trajectories of air masses calculated with the HYSPLIT 4.9 regional model for particular days where airborne pollen of Weinmannia trichosperma Cav. was detected east of the Andes. This pollen type was selected because it is found regularly at localities in eastern Patagonia beyond its present-day distribution. Weinmannia's substantial presence during early Holocene times would also benefit from better knowledge of its transport mechanisms. Correspondence between atmospheric trajectories and the position of sources was checked using GIS maps. Mode T, Principal Component Analysis (PCA) with Varimax rotation was used to identify the main spatial structure of geopotential height anomalies producing the calculated trajectories. Eighty-eight cases showed that the calculated directions of trajectories trended from the Northwest to Southwest passing over the Chilean region of W. trichosperma distribution. PCs results showed two patterns of negative anomalies over southern Patagonia. The prevailing circulation pattern which drives airborne transport is the presence of a trough located south of 37 to 40 S with its axis over western Patagonia. The synoptic situations for two cases highly correlated with principal component scores were described. © Author(s) 2009.

Registro:

Documento: Artículo
Título:A statistical study of Weinmannia pollen trajectories across the Andes
Autor:Pérez, C.F.; Castañeda, M.E.; Gassmann, M.I.; Bianchi, M.M.
Filiación:Departamento de Ciencias de la Atmósfera y Los Océanos, FCEN, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Inibioma-CONICET-UNCo, Calle Quintral 1250, 8400 San Carlos de Bariloche, Rio Negro, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Palabras clave:air mass; atmospheric transport; correspondence analysis; dicotyledon; GIS; numerical model; pollen; principal component analysis; synoptic meteorology; trajectory; Andes; Chile; Patagonia; Weinmannia; Weinmannia trichosperma
Año:2009
Volumen:22
Página de inicio:79
Página de fin:84
DOI: http://dx.doi.org/10.5194/adgeo-22-79-2009
Título revista:Advances in Geosciences
Título revista abreviado:Adv. Geosci.
ISSN:16807340
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16807340_v22_n_p79_Perez

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Citas:

---------- APA ----------
Pérez, C.F., Castañeda, M.E., Gassmann, M.I. & Bianchi, M.M. (2009) . A statistical study of Weinmannia pollen trajectories across the Andes. Advances in Geosciences, 22, 79-84.
http://dx.doi.org/10.5194/adgeo-22-79-2009
---------- CHICAGO ----------
Pérez, C.F., Castañeda, M.E., Gassmann, M.I., Bianchi, M.M. "A statistical study of Weinmannia pollen trajectories across the Andes" . Advances in Geosciences 22 (2009) : 79-84.
http://dx.doi.org/10.5194/adgeo-22-79-2009
---------- MLA ----------
Pérez, C.F., Castañeda, M.E., Gassmann, M.I., Bianchi, M.M. "A statistical study of Weinmannia pollen trajectories across the Andes" . Advances in Geosciences, vol. 22, 2009, pp. 79-84.
http://dx.doi.org/10.5194/adgeo-22-79-2009
---------- VANCOUVER ----------
Pérez, C.F., Castañeda, M.E., Gassmann, M.I., Bianchi, M.M. A statistical study of Weinmannia pollen trajectories across the Andes. Adv. Geosci. 2009;22:79-84.
http://dx.doi.org/10.5194/adgeo-22-79-2009