A pollen-climate calibration from western Patagonia for palaeoclimatic reconstructions

Date

2019

Authors

Montade, Vincent
Peyron, Odile
Favier, Charly
Francois, Jean Pierre
Haberle, Simon

Journal Title

Journal ISSN

Volume Title

Publisher

Wiley

Abstract

Palaeoecological studies of sediment records from the western margins of southern South America have revealed vegetation dynamics to be under the influence of major regional climate drivers such as the Southern Westerly Winds, Southern Annular Mode and El Nino Southern Oscillation. Despite the substantial number of ~ palynological records in this region, very few quantitative pollen-based climate reconstructions using surface samples have been made. In this context, our objective was first to investigate the modern pollen–vegetation– climate relationships in the western Patagonian. The results show that the modern pollen dataset reflects the main vegetation types and that summer precipitation and winter temperature represent the main climate parameters controlling vegetation distribution. Secondly using this pollen–climate dataset we evaluate and compare the performance of two models (Weighted Averaging Partial Least Squares and Modern Analog Technique). We used these models to make climate reconstructions from two oceanic pollen records from western Patagonia. Compared with independent climate indicators, our pollen-inferred climate reconstructions reveal the same overall trends, showing the potential of pollen–climate transfer functions applied to this region. This study provides much needed data for quantitative climate reconstructions in South America, but which also needs to be improved by enlarging the modern pollen dataset.

Description

Keywords

palaeoclimate, pollen, quantitative climate reconstruction, South America, western Patagonia

Citation

Source

Journal of Quaternary Science

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1002/jqs.3082

Restricted until

2099-12-31