Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
Clim. Past, 12, 189-200, 2016
https://doi.org/10.5194/cp-12-189-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
03 Feb 2016
A 250-year periodicity in Southern Hemisphere westerly winds over the last 2600 years
C. S. M. Turney1,2, R. T. Jones3, C. Fogwill1,2, J. Hatton3, A. N. Williams1,4, A. Hogg5, Z. A. Thomas1,2, J. Palmer1,2, S. Mooney1, and R. W. Reimer6 1School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, Australia
2Climate Change Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, Australia
3Department of Geography, Exeter University, Exeter EX4 4RJ, UK
4Archaeological & Heritage Management Solutions Pty Ltd, 2/729 Elizabeth Street, Waterloo, NSW 2017, Australia
5Waikato Radiocarbon Laboratory, University of Waikato, Private Bag 3105, Hamilton, New Zealand
6School of Geography, Archaeology and Palaeoecology, Queen's University Belfast, Belfast BT7 1NN, UK
Abstract. Southern Hemisphere westerly airflow has a significant influence on the ocean–atmosphere system of the mid- to high latitudes with potentially global climate implications. Unfortunately, historic observations only extend back to the late 19th century, limiting our understanding of multi-decadal to centennial change. Here we present a highly resolved (30-year) record of past westerly wind strength from a Falkland Islands peat sequence spanning the last 2600 years. Situated within the core latitude of Southern Hemisphere westerly airflow (the so-called furious fifties), we identify highly variable changes in exotic pollen and charcoal derived from South America which can be used to inform on past westerly air strength. We find a period of high charcoal content between 2000 and 1000 cal. years BP, associated with increased burning in Patagonia, most probably as a result of higher temperatures and stronger westerly airflow. Spectral analysis of the charcoal record identifies a pervasive ca. 250-year periodicity that is coherent with radiocarbon production rates, suggesting that solar variability has a modulating influence on Southern Hemisphere westerly airflow. Our results have important implications for understanding global climate change through the late Holocene.

Citation: Turney, C. S. M., Jones, R. T., Fogwill, C., Hatton, J., Williams, A. N., Hogg, A., Thomas, Z. A., Palmer, J., Mooney, S., and Reimer, R. W.: A 250-year periodicity in Southern Hemisphere westerly winds over the last 2600 years, Clim. Past, 12, 189-200, https://doi.org/10.5194/cp-12-189-2016, 2016.
Publications Copernicus
Download
Short summary
Southern Hemisphere westerly airflow is considered a major driver of Southern Ocean and global climate. Observational records, however, are limited. Here we present a new Falkland Islands record that exploits "exotic" South America pollen and charcoal to reconstruct changing airflow. We find stronger winds 2000–1000 cal. yr BP, associated with increased burning, and a 250-year periodicity, suggesting solar forcing. Our results have important implications for understanding late Holocene climates.
Southern Hemisphere westerly airflow is considered a major driver of Southern Ocean and global...
Share