Abstract's details

Extreme events in three years of ocean physical measurements at the Global Argentine Basin Array of the Ocean Observatory Initiative

Camila Artana (CSIC ICM, Spain)

CoAuthors

Christine Provost (LOCEAN, France)

Event: 2022 Ocean Surface Topography Science Team Meeting

Session: Science III: Mesoscale and sub-mesoscale oceanography

Presentation type: Type Poster

We analyzed physical parameters gathered by a mooring array at mesoscale spatial sampling deployed in Argentine Basin within the Ocean Observatory Initiative, a National Science Foundation Major Research Facility. The array was maintained at 42°S 42°W, a historically sparsely sampled region with small ocean variability, during 34 months from March 2015 to January 2018. The data documented four extreme oceanic events in 2016, a year that stands out with the highest level of eddy kinetic energy in the 29-year-long satellite altimetry record at the mooring site. The four events were anticyclonic structures, a meander of the Subtropical Front and three intense anticyclonic eddies with swirl velocities of the order of 0.4 m/s. Satellite altimetry provided complementary information on the size, origin and fate of the structures. The three anticyclonic eddies (named A1, A2' and A2") showed distinct characteristics. A1 was a large, 300 km-diameter, bottom-reaching eddy. In contrast, A2' and A2" were smaller with a size close to the Rossby radius (40 km) and a vertical extension of 2500 m. They were attenuated in the satellite altimetry maps. The high-frequency mooring data indicated the presence of near-inertial waves trapped at depth within the anticyclones and provided evidence of favorable conditions for the potential development of mixing well below the mixed layer.
 

Poster show times:

Room Start Date End Date
Mezzanine Tue, Nov 01 2022,17:15 Tue, Nov 01 2022,18:15
Mezzanine Thu, Nov 03 2022,14:00 Thu, Nov 03 2022,15:45
Camila Artana
CSIC ICM
Spain
c.artana@icm.csic.es