August 30, 3:00pm - 4:00pm
Mānoa Campus, MSB 114
â€œOceanic Variability from Mesoscale to Submesoscaleâ€
Professor, Dept. of Oceanography
This presentation focuses on the mesoscale (>150km in wavelength) versus submesoscale variability (10-150km) in the subtropical circulation of the North Pacific Ocean. First, we analyze the AVISO satellite altimetry product, the repeat ship-board ADCP data and output from a 1/30-deg high-resolution OGCM simulation to contrast the seasonal Subtropical Countercurrent (STCC) variability in the mesoscale-submesoscale ranges. Importance of mesoscale and submesoscale variability in controlling, respectively, the horizontal and vertical circulation, is emphasized. Utilizing the theoretical framework of effective surface quasi-geostrophic (eSQG) dynamics, we explore next the potential of reconstructing the 3D upper ocean circulation features, including the vertical velocity field, from high-resolution sea surface height (SSH) data. Challenges of disentangling the SSH signals associated with the balanced versus unbalanced motions will be raised.
Dept. of Oceanography, Mānoa Campus
(808) 956-7633, http://www.soest.hawaii.edu/oceanography/index.html, OCN Seminar 8.30.18 Flyer (PDF)