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Karen Heywood (UEA) Andrew Thompson (U Abigail Nye (UEA) Karen Heywood (UEA) Andrew Thompson (U. Camb.) Sally Thorpe (BAS) Angelika Renner (BAS) Antarctic Peninsula Falkland Is. Chile South Georgia South Sandwich Is. South Orkney South Is. Southern Ocean Shetland Is. Joinville Is. Weddell Sea Antarctic Peninsula Deployment positions (Feb 2007) • 40 surface drifters drogued at 15m Weddell-Scotia Confluence South Orkney Islands Powell Bransfield Basin Strait Joinville Ridge Weddell Sea Deployment positions (Feb 2007) • 40 surface drifters drogued at 15m • 4 Argo floats in Weddell Sea – Weddell-Scotia parking depth of Confluence 1000m South Orkney Islands Powell Bransfield Basin Strait Joinville Ridge Weddell Sea Deployment positions (Feb 2007) • 40 surface drifters drogued at 15m • 4 Argo floats in Weddell Sea – Weddell-Scotia parking depth of Confluence 1000m South Orkney Islands Powell • 4 Argo floats in Bransfield Basin Strait Drake Passage Joinville Ridge Weddell Sea Argo and drifter trajectories • 40 surface drifters drogued at 15m • 4 Argo floats in Weddell Sea – parking depth of 1000m • 4 Argo floats in Drake Passage Argo and drifter trajectories • 40 surface drifters drogued at 15m • 4 Argo floats in Weddell Sea – parking depth of 1000m • 4 Argo floats in Drake Passage Ship ADCP Lowered ADCP • Argo floats faster than drifters in reaching ridge • Antarctic Slope Front stronger with depth Argo and drifter trajectories • 40 surface drifters drogued at 15m • 4 Argo floats in Weddell Sea – parking depth of 1000m • 4 Argo floats in Drake Passage Argo and drifter trajectories • 40 surface drifters drogued at 15m • 4 Argo floats in Weddell Sea – parking depth of 1000m • 4 Argo floats in Drake Passage Numerical tracer trajectories at 14m J • OCCAM: ¼°, 66 vertical levels F • Multiyear monthly mean velocity fields (1985-2004) M • 2° gridded Smith & Sandwell bathymetry Numerical tracer trajectories at 14m J • OCCAM: ¼°, 66 vertical levels F • Multiyear monthly mean velocity fields (1985-2004) M • 2° gridded Smith & Sandwell bathymetry Numerical tracer trajectories at 931m • OCCAM: ¼°, 66 vertical levels • Multiyear monthly mean velocity fields (1985-2004) • 2° gridded Smith & Sandwell bathymetry Numerical tracer trajectories at 931m • OCCAM: ¼°, 66 vertical levels • Multiyear monthly mean velocity fields (1985-2004) • 2° gridded Smith & Sandwell bathymetry Iceberg tracks • Data set 1: QuikSCAT satellite data (image tracking) • Data set 2: GPS data • 1 day temporal resolution • Period: July 1999 - present Iceberg tracks • Data set 1: QuikSCAT satellite data (image tracking) • Data set 2: GPS data • 1 day temporal resolution • Period: July 1999 - present Iceberg tracks • Data set 1: QuikSCAT satellite data (image tracking) • Data set 2: GPS data • 1 day temporal resolution • Period: July 1999 - present Additional Argo data Other float trajectories-dashed lines for missing data • Additional data from 9 other floats in region [Coriolis data centre] • 2 currently active ADELIE Argo profiles ADELIE Argo profiles ADELIE Argo profiles Summary • Surface drifters and Argo float follow similar trajectories • Argo floats take shorter times than surface drifters to reach the South Scotia ridge • Numerical model captures Argo float and drifter trajectories only as far as the southern edge of the South Scotia Ridge • Good correlation between iceberg and surface drifter trajectories References & Publications • Thompson, A.F., K.J. Heywood, S.E. Thorpe, A.H.H. Renner, A. Trasvina-Castro, 2008. Surface circulation at the tip of the Antarctic Peninsula from drifters. Journal of Physical Oceanography. In press. • Thompson, A.F. & K.J. Heywood, 2008. Frontal structure and transport in the north-western Weddell Sea. Deep-Sea Research I. In press. • Argo data - http://www.usgodae.org • Iceberg data - Image tracking: http://www.scp.byu.edu (Bringham Young University, Utah); GPS data – courtesy of H.Hellmer, AWI. Thank you for listening! ADELIE Argo profiles.
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