A first description of the Antarctic Peninsula Coastal Current
Carlos Moffat1, Robert Beardsley2, Breck Owens2, and Nicole van Lipzig3
We present hydrographic and shipboard ADCP data collected during the fall (April/June) and winter (July/August) and moored velocity observations collected from 2001 to early 2002 on the west Antarctic Peninsula (wAP) shelf during the Southern Ocean Global Ecosystems Dynamics (SO GLOBEC) Program. In fall, a geostrophically balanced, buoyant current flows southward along the coast. This Antarctic Peninsula Coastal Current (APCC) forms during the ice-free season and extends from Adelaide Island to Alexander Island, although its path inside Marguerite Bay is uncertain. During the fall of 2001, the APCC transported an estimated 0.32±0.13 Sv and the freshwater transport was of the order of 126±50 km3·yr-1. From early July to late October, the APCC disappears from the coast as the freshwater input from the coast diminishes and sea ice forms on the shelf. An examination of the relative sizes of the freshwater sources suggest runoff from land and precipitation over the ocean are the primary sources for the APCC.
1 MIT/Woods Hole Oceanographic Institution Joint Program in Physical Oceanography, Woods Hole, USA
2 Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, USA
3 Physical and Regional Geography Research Group, K.U.Leuven, Belgium