Richman, J. G. Oregon Sate University, jrichman@oce.orst.edu
Barth, J. G. Oregon State University, barth@oce.orst.edu
Cowles, T. J. Oregon State University, tjc@oce.orst.edu
Pierce, S. D. Oregon State University, spierce@oce.orst.edu

 
LOCATION AND PHYSICAL/BIOLOGICAL STRUCTURE OF THE FRONTS ALONG 170W
 
As part of the Antarctic Environment and Southern Ocean Process Study (AESOPS), two high resolution transects of physical (temperature, salinity and velocity) and bio-optical (flourescence, absorption and attenuation) properties along 170W using the SeaSoar and shipboard ADCP were obtained in the austral spring and summer of 1997/98. In these transects, numerous fronts can be located in the velocity and temperature data corresponding to the surface and subsurface expressions of the Antarctic Polar Front (PF) and SubAntarctic Front. The data from these high-resolution transects are compared with the physical and chemical data from the longer, full depth WOCE 170W section in late austral summer of 1996 and the classical definitions of the fronts. In the spring transect, deep mixed layers are found north of the PF. The PF is broken into two pieces separated by approximately 50 km with the north portion corresponding to the classical definition of the location of the 2C isotherm at 200 m. In the summer transect, the PF is again separated into two pieces. the northern portion corresponding to the 2C at 200 m definition has a weak sea surface temperature gradient, while the southern front has a stronger SST gradient. In the summer transect and WOCE section, the highest mixed layer chlorophyll occur well south of the PF with surface silica levels low north of the PF. In the spring transect, the chlorophyll levels are much lower with local maximum associated with the southern expression of the PF.
 
Day: Wednesday, Feb. 3
Time: 02:00 - 02:15pm
Location: Sweeney Center
 
Code: SS31WE0200S