Bonus announcement 
Passing on a seminar invitation at CSIRO on 13 August.
Dear all,
Please join us for a seminar by Prof Sung Yong Kim from Korea Advanced Institute of Science and Technology (KAIST) at 11 am on Wednesday 13 August. The seminar will be held in a hybrid format, in CSIRO’s Freycinet Meeting Room and online via Teams (link below).
Title: Submesoscale surface geophysical turbulence: Energy spectra and fluxes
Time: 11am, Wednesday, 13 August
Location: CSIRO Freycinet Room (next to CSIRO reception) and online via Teams (link below)
Abstract: This talk presents submesoscale surface geophysical turbulence studies, focusing on energy spectra and energy fluxes, based on remotely sensed observations such as altimetry, geostationary ocean color imagery, and high-frequency radars at the O(1)-km spatial resolution and O(1) hour temporal resolution. The dynamics of surface currents are governed by tides, winds, the Coriolis force, low-frequency pressure gradients (less than 0.4 cycles per day), and nonlinear interactions among these forces. The kinetic energy spectra of the surface currents in the wavenumber domain (k) become steeper at a scale of approximately 10 km from a slope of k-5/3 to slopes between k-2 and k-3 at a length scale of 2 km. Moreover, the energy spectra of chlorophyll exhibit anisotropy associated with bathymetric effects and regional circulation, and their decay slopes change from k-5/3 to k-1 at scales of O(10) km and from k-1 to k-3 at scales of O(1) km, which is consistent with the two-dimensional quasi-geostrophic turbulence theory. The spectral decay slopes of these energy spectra show weak seasonality, which can be interpreted by the baroclinic instability in the weak seasonal mixed layer and the persistent and non-seasonal regional circulations.
Bio: Prof. Kim received his B.S. in Naval Architecture and Ocean Engineering from Seoul National University (1999) and a Ph.D. in Oceanography from Scripps Institution of Oceanography, UC San Diego (2009). He leads the Environmental Fluid Mechanics Laboratory, where his research spans environmental fluid dynamics, air‑sea and air‑sea‑land interaction processes, coastal circulation, mesoscale and sub-mesoscale turbulence, and integrated ocean observing systems, often leveraging big‑data analysis and machine‐learning methods.
If you are interested in meeting with Prof Kim next week, please feel free to contact me xuebin.zhang@csiro.au, or him directly via email: syongkim@kaist.ac.kr
Regards,
Xuebin Zhang
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