A case study of anisotropic airborne pollen transport in Northern Patagonia using a Lagrangian particle dispersion model
Accumulated pollen sequences are used to infer temporal changes in vegetation composition. Pollen transport and dispersal by winds introduce large biases in the interpretation of pollen records. In order to calibrate the models used to infer past species distributions, human activities or climate, c...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00346667_v258_n_p215_Perez http://hdl.handle.net/20.500.12110/paper_00346667_v258_n_p215_Perez |
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paper:paper_00346667_v258_n_p215_Perez |
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paper:paper_00346667_v258_n_p215_Perez2023-06-08T15:00:48Z A case study of anisotropic airborne pollen transport in Northern Patagonia using a Lagrangian particle dispersion model Data treatment Lagrangian model Northern Patagonia Pollen transport Present Quantitative reconstruction airborne survey anisotropy dispersal dispersion environmental modeling evergreen tree human activity Lagrangian analysis paleoclimate paleoenvironment pollen quantitative analysis reconstruction Andes Patagonia Weinmannia trichosperma Accumulated pollen sequences are used to infer temporal changes in vegetation composition. Pollen transport and dispersal by winds introduce large biases in the interpretation of pollen records. In order to calibrate the models used to infer past species distributions, human activities or climate, contemporary time series of pollen records are assessed and modelled. The Gaussian plume model assumes that pollen transport takes place in a neutral atmosphere and pollen contribution is even from all directions (isotropy). In this study, we analyse these assumptions with airborne pollen measurements of Weinmannia trichosperma, a forest tree which grows mainly on the western slopes of the Andes, along with other characteristic species of the steppe which develops in eastern Patagonia. Instead of the Gaussian plume mixing model that is usually employed in the theory of pollen analysis, we apply a full 3D Lagrangian dispersion model, which allows calculation of potential source distributions (footprint) from modelled backward trajectories of airborne pollen observations. Results show that neutral atmospheric conditions are properly assumed for the region. The footprint calculated from the modelled trajectories of a five-year record is consistent with the location of pollen sources but the footprint shape showed that pollen contribution is uneven due to the influence of transient weather systems. © 2018 Elsevier B.V. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00346667_v258_n_p215_Perez http://hdl.handle.net/20.500.12110/paper_00346667_v258_n_p215_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 |
Data treatment Lagrangian model Northern Patagonia Pollen transport Present Quantitative reconstruction airborne survey anisotropy dispersal dispersion environmental modeling evergreen tree human activity Lagrangian analysis paleoclimate paleoenvironment pollen quantitative analysis reconstruction Andes Patagonia Weinmannia trichosperma |
| spellingShingle |
Data treatment Lagrangian model Northern Patagonia Pollen transport Present Quantitative reconstruction airborne survey anisotropy dispersal dispersion environmental modeling evergreen tree human activity Lagrangian analysis paleoclimate paleoenvironment pollen quantitative analysis reconstruction Andes Patagonia Weinmannia trichosperma A case study of anisotropic airborne pollen transport in Northern Patagonia using a Lagrangian particle dispersion model |
| topic_facet |
Data treatment Lagrangian model Northern Patagonia Pollen transport Present Quantitative reconstruction airborne survey anisotropy dispersal dispersion environmental modeling evergreen tree human activity Lagrangian analysis paleoclimate paleoenvironment pollen quantitative analysis reconstruction Andes Patagonia Weinmannia trichosperma |
| description |
Accumulated pollen sequences are used to infer temporal changes in vegetation composition. Pollen transport and dispersal by winds introduce large biases in the interpretation of pollen records. In order to calibrate the models used to infer past species distributions, human activities or climate, contemporary time series of pollen records are assessed and modelled. The Gaussian plume model assumes that pollen transport takes place in a neutral atmosphere and pollen contribution is even from all directions (isotropy). In this study, we analyse these assumptions with airborne pollen measurements of Weinmannia trichosperma, a forest tree which grows mainly on the western slopes of the Andes, along with other characteristic species of the steppe which develops in eastern Patagonia. Instead of the Gaussian plume mixing model that is usually employed in the theory of pollen analysis, we apply a full 3D Lagrangian dispersion model, which allows calculation of potential source distributions (footprint) from modelled backward trajectories of airborne pollen observations. Results show that neutral atmospheric conditions are properly assumed for the region. The footprint calculated from the modelled trajectories of a five-year record is consistent with the location of pollen sources but the footprint shape showed that pollen contribution is uneven due to the influence of transient weather systems. © 2018 Elsevier B.V. |
| title |
A case study of anisotropic airborne pollen transport in Northern Patagonia using a Lagrangian particle dispersion model |
| title_short |
A case study of anisotropic airborne pollen transport in Northern Patagonia using a Lagrangian particle dispersion model |
| title_full |
A case study of anisotropic airborne pollen transport in Northern Patagonia using a Lagrangian particle dispersion model |
| title_fullStr |
A case study of anisotropic airborne pollen transport in Northern Patagonia using a Lagrangian particle dispersion model |
| title_full_unstemmed |
A case study of anisotropic airborne pollen transport in Northern Patagonia using a Lagrangian particle dispersion model |
| title_sort |
case study of anisotropic airborne pollen transport in northern patagonia using a lagrangian particle dispersion model |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00346667_v258_n_p215_Perez http://hdl.handle.net/20.500.12110/paper_00346667_v258_n_p215_Perez |
| _version_ |
1768542354075025408 |