World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

Centennial-scale Shifts in the Position of the Southern Hemisphere Westerly Wind Belt Over the Past Millennium : Volume 9, Issue 3 (13/06/2013)

By Koffman, B. G.

Click here to view

Book Id: WPLBN0003972514
Format Type: PDF Article :
File Size: Pages 50
Reproduction Date: 2015

Title: Centennial-scale Shifts in the Position of the Southern Hemisphere Westerly Wind Belt Over the Past Millennium : Volume 9, Issue 3 (13/06/2013)  
Author: Koffman, B. G.
Volume: Vol. 9, Issue 3
Language: English
Subject: Science, Climate, Past
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Birkel, S. D., Breton, D. J., Kreutz, K. J., Kane, E. J., Winski, D. A., Koffman, B. G.,...Handley, M. J. (2013). Centennial-scale Shifts in the Position of the Southern Hemisphere Westerly Wind Belt Over the Past Millennium : Volume 9, Issue 3 (13/06/2013). Retrieved from

Description: School of Earth and Climate Sciences, University of Maine, 5790 Bryand Global Sciences Center, Orono, ME 04469, USA. We present the first high-resolution (sub-annual) dust particle dataset from West Antarctica, developed from the West Antarctic Ice Sheet (WAIS) Divide deep ice core (79.468° S, 112.086° W), and use it to reconstruct past atmospheric circulation. We find a background dust flux of ∼4 mg m−2 yr−1 and a mode particle size of 5–8 Μm diameter. Through comparison with other Antarctic ice core particle records, we observe that coastal and lower-elevation sites have higher dust fluxes and coarser particle size distributions (PSDs) than sites on the East Antarctic plateau, suggesting input from local dust sources at lower elevations and sites closer to the coast. In order to explore the use of the WAIS Divide dust PSD as a proxy for past atmospheric circulation, we make quantitative comparisons between mid-latitude zonal wind speed and the dust size (coarse particle percentage, CPP) record, finding significant positive interannual relationships. Using our CPP record, and through comparison with spatially distributed climate reconstructions from the Southern Hemisphere (SH) middle and high latitudes, we infer latitudinal shifts in the position of the SH westerly wind belt during the Medieval Climate Anomaly (MCA; ∼950–1350 C.E.) and Little Ice Age (LIA; ∼1400–1850 C.E.) climate intervals. We suggest that the SH westerlies occupied a more southerly position during the MCA, and shifted equatorward at the onset of the LIA (∼ 1430 C.E.) due to cooler surface temperatures and a contraction of the SH Hadley cell.

Centennial-scale shifts in the position of the Southern Hemisphere westerly wind belt over the past millennium

Albani, S., Mahowald, N. M., Delmonte, B., Maggi, V., and Winckler, G.: Comparing modeled and observed changes in mineral dust transport and deposition to Antarctica between the Last Glacial Maximum and current climates, Clim. Dynam., 38, 1731–1755, doi:10.1007/s00382-011-1139-5, 2011.; Albani, S., Delmonte, B., Maggi, V., Baroni, C., Petit, J.-R., Stenni, B., Mazzola, C., and Frezzotti, M.: Interpreting last glacial to Holocene dust changes at Talos Dome (East Antarctica): implications for atmospheric variations from regional to hemispheric scales, Clim. Past, 8, 741–750, doi:10.5194/cp-8-741-2012, 2012. % ### SELF-REFERENCE ###; Anderson, R. F., Ali, S., Bradtmiller, L. I., Nielsen, S. H. H., Fleisher, M. Q., Anderson, B. E., and Burckle, L. H.: Wind-driven upwelling in the Southern Ocean and the deglacial rise in atmospheric CO2, Science, 323, 1443–1448, doi:10.1126/science.1167441, 2009.; Arblaster, J. M. and Meehl, G. A.: Contributions of external forcings to Southern annular mode trends, J. Climate, 19, 2896–2905, 2006.; Banta, J. R., McConnell, J. R., Frey, M. M., Bales, R. C., and Taylor, K. C.: Spatial and temporal variability in snow accumulation at the West Antarctic ice sheet divide over recent centuries, J. Geophys. Res., 113, D23102, doi:10.1029/2008JD010235, 2008.; Basile, I., Grousset, F. E., Revel, M., Petit, J. R., Biscaye, P. E., and Barkov, N. I.: Patagonian origin of glacial dust deposited in East Antarctica (Vostok and Dome C) during glacial stages 2, 4 and 6, Earth Planet. Sc. Lett., 146, 573–589, 1997.; Bertler, N. A. N., Mayewski, P., and Carter, L.: Cold conditions in Antarctica during the Little Ice Age – implications for abrupt climate change mechanisms, Earth Planet. Sc. Lett., 308, 41–51, doi:10.1016/j.epsl.2011.05.021, 2011.; Bertler, N. A. N., Mayewski, P., Aristarain, A. J., Barrett, P., Becagli, S., Bernardo, R., Bo, S., Xiao, C., Curran, M., Qin, D., Dixon, D. A., Ferron, F., Fischer, H., Frey, M., Frezzotti, M., Fundel, F., Genthon, C., Gragnani, R., Hamilton, G., Handley, M., Hong, S., Isaksson, E., Kang, J., Ren, J., Kamiyama, K., Kanamori, S., Karkas, E., Karlof, L., Kaspari, S., Kreutz, K., Kurbatov, A., Meyerson, E., Ming, Y., Zhang, M., Motoyama, H., Mulvaney, R., Oerter, H., Osterberg, E., Proposito, M., Pyne, A., Ruth, U., Simoes, J. C., Smith, B., Sneed, S. B., Teinila, K., Traufetter, F., Udisti, R., Virkkula, A., Watanabe, O., Wiliamson, B., Winther, J.-G., Li, Y., Wolff, E., Li, Z., and Zielinski, A.: Snow chemistry across Antarctica, Ann. Glaciol., 41, 167–179, 2005.; Bjorck, S., Rundgren, M., Ljung, K., Unkel, I., and Wallin, A.: Multi-proxy analyses of a peat bog on Isla de los Estados, Easternmost Tierra del Fuego: a unique record of the variable Southern Hemisphere westerlies since the last deglaciation, Quaternary Sci. Rev., 42, 1–14, doi:10.1016/j.quascirev.2012.03.015, 2012.; Bory, A. J.-M., Wolff, E., Mulvaney, R., Jagoutz,&nbs


Click To View

Additional Books

  • Tree-ring–based Summer Mean Temperature ... (by )
  • A Modelling Approach to Assessing the Ti... (by )
  • Ice Core Precipitation Record in Central... (by )
  • Contribution of Changes in Opal Producti... (by )
  • Late Glacial and Holocene Changes in Veg... (by )
  • Distinct Responses of East Asian Summer ... (by )
  • Development of Coccolithophore-based Tra... (by )
  • Corrigendum to Upper Ocean Climate of th... (by )
  • Can We Determine What Controls the Spati... (by )
  • Upper Ocean Climate of the Eastern Medit... (by )
  • Reexamining the Barrier Effect of Tibeta... (by )
  • Upper Ocean Climate of the Eastern Medit... (by )
Scroll Left
Scroll Right


Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.