A statistical study of Weinmannia pollen trajectories across the Andes

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 transp...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Castañeda, María Elizabeth, Gassmann, María Isabel
Publicado:	2009
Materias:	air mass atmospheric transport correspondence analysis dicotyledon GIS numerical model pollen principal component analysis synoptic meteorology trajectory Andes Chile Patagonia Weinmannia Weinmannia trichosperma
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16807340_v22_n_p79_Perez http://hdl.handle.net/20.500.12110/paper_16807340_v22_n_p79_Perez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_16807340_v22_n_p79_Perez
record_format	dspace
spelling	paper:paper_16807340_v22_n_p79_Perez2023-06-08T16:26:39Z A statistical study of Weinmannia pollen trajectories across the Andes Castañeda, María Elizabeth Gassmann, María Isabel air mass atmospheric transport correspondence analysis dicotyledon GIS numerical model pollen principal component analysis synoptic meteorology trajectory Andes Chile Patagonia Weinmannia Weinmannia trichosperma 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. Fil:Castañeda, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gassmann, M.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16807340_v22_n_p79_Perez http://hdl.handle.net/20.500.12110/paper_16807340_v22_n_p79_Perez
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	air mass atmospheric transport correspondence analysis dicotyledon GIS numerical model pollen principal component analysis synoptic meteorology trajectory Andes Chile Patagonia Weinmannia Weinmannia trichosperma
spellingShingle	air mass atmospheric transport correspondence analysis dicotyledon GIS numerical model pollen principal component analysis synoptic meteorology trajectory Andes Chile Patagonia Weinmannia Weinmannia trichosperma Castañeda, María Elizabeth Gassmann, María Isabel A statistical study of Weinmannia pollen trajectories across the Andes
topic_facet	air mass atmospheric transport correspondence analysis dicotyledon GIS numerical model pollen principal component analysis synoptic meteorology trajectory Andes Chile Patagonia Weinmannia Weinmannia trichosperma
description	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.
author	Castañeda, María Elizabeth Gassmann, María Isabel
author_facet	Castañeda, María Elizabeth Gassmann, María Isabel
author_sort	Castañeda, María Elizabeth
title	A statistical study of Weinmannia pollen trajectories across the Andes
title_short	A statistical study of Weinmannia pollen trajectories across the Andes
title_full	A statistical study of Weinmannia pollen trajectories across the Andes
title_fullStr	A statistical study of Weinmannia pollen trajectories across the Andes
title_full_unstemmed	A statistical study of Weinmannia pollen trajectories across the Andes
title_sort	statistical study of weinmannia pollen trajectories across the andes
publishDate	2009
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16807340_v22_n_p79_Perez http://hdl.handle.net/20.500.12110/paper_16807340_v22_n_p79_Perez
work_keys_str_mv	AT castanedamariaelizabeth astatisticalstudyofweinmanniapollentrajectoriesacrosstheandes AT gassmannmariaisabel astatisticalstudyofweinmanniapollentrajectoriesacrosstheandes AT castanedamariaelizabeth statisticalstudyofweinmanniapollentrajectoriesacrosstheandes AT gassmannmariaisabel statisticalstudyofweinmanniapollentrajectoriesacrosstheandes
_version_	1768545391793405952

A statistical study of Weinmannia pollen trajectories across the Andes

Ejemplares similares