| Title | Extreme intra-seasonal anomalies in the Amundsen and Bellingshausen sea-ice area, Antarctica, during the austral winter |
| Author | Furtado de Lima, F.U.; Vespoli de Carvalho, L.M. |
| Author Affil | Furtado de Lima, F.U., University of Sao Paulo, Department of Atmospheric Sciences, Sao Paulo, Brazil |
| Source | Annals of Glaciology, Vol.48, p.58-64, ; International Union of Geodesy and Geophysics meeting, Perugia, Italy, July 2- 13, 2007, prefaced by J. Jacka. Publisher: International Glaciological Society, Cambridge, United Kingdom. ISSN: 0260-3055. ISBN: 0-946417-43-1 |
| Publication Date | 2008 |
| Notes | In English. 25 refs. GeoRef Acc. No: 285814. CRREL Acc. No: 62004563 |
| Index Terms | ice; ice cover; ice cover thickness; Southern Ocean--Bellingshausen Sea; Amundsen Sea; anomalies; atmosphere; Bellingshausen Sea; circulation; ice cover distribution; sea ice; sea-surface temperature; seasonal variations; Southern Ocean |
| Abstract | We examine the role of the propagation of atmospheric mid-latitudes wave trains in modulating the Amundsen and Bellingshausen sea-ice area (SIA), Antarctica, on intra- seasonal timescales (20-100 days). Spectral analysis of passive microwave estimates of SIA in the Amundsen and Bellingshausen Seas for 1979-2004 shows significant peaks on intra-seasonal timescales. Previous studies have suggested that variations in SIA are linked to disturbances in atmospheric circulation and sea surface temperature. We show that extreme SIA anomalies on intra- seasonal timescales lag the propagation of subtropical wave trains in the Southern Hemisphere by approximately 10-15 days. The sign of the SIA anomaly depends on the phase of the wave. We present evidence that the number of disturbances that cause extreme anomalies of SIA on intra-seasonal timescales has increased in the last 14 years. |
| URL | http://hdl.handle.net/10.3189/172756408784700671 |
| Publication Type | conference paper or compendium article |
| Record ID | 84540 |