- Peer-reviewed Published work:
Wang, Lei, and Noboru Nakamura, 2016: Covariation of finite-amplitude wave activity and the zonal mean flow in the mid-latitude troposphere. Part 2: Eddy forcing spectra and the periodic behavior in the Southern Hemisphere summer. Journal of the Atmospheric Sciences Link and PDF*.
- Eddy forcing spectra exhibit strong seasonality in Southern Hemisphere storm track.
- In austral summer, the constructive interference of eddies with different eddy phase speeds enhances the 20-30 day periodicity in eddy heat flux.
- GCM simulations show the governing role of austral summer basic state, which confines the baroclinic zone.
- Synoptic eddies can substantially amplify the radiative-forced meridional asymmetric of a zonal jet.
- An eddy-free reference state is constructed for a two-layer quasi-geostrophic baroclinic turbulence, which quantitatively decompose the radiative-forced and eddy-induced circulation change.
- The eddy-accentuated effect of jet shift is greater as the baroclinicity of the equilibrium state is reduced.
Wang, Lei, Malte Jansen, and Ryan Abernathey, 2016: Eddy phase speeds in a two-layer model of quasigeostrophic baroclinic turbulence with applications to ocean observations. Journal of Physical Oceanography Link and PDF*.
- QG two-layer model’s eddy phase speeds can be understood in terms of the reduced gravity mode and barotropic mode.
- The strength of inverse cascade exerts an important control on eddy phase speeds through barotropization.
- Satellite observations confirm that eddy phase speeds in the Antarctic Circumpolar Current and Subtropical region are well predicted by the reduced-gravity mode and barotropic mode.
2015: Covariation of finite-amplitude wave activity and the zonal mean flow in the midlatitude troposphere: Part 1. Theory and application to the Southern Hemisphere summer. Geophysical Research Letters Link and PDF**.and
- Barotropic wave-mean flow interaction is formulated through finite-amplitude wave activity budget.
- In Southern Hemisphere summer, FAWA anomaly exhibits a marked periodicity around 20-30 days.
- A strong thermal damping of surface FAWA allows interior FAWA to be controlled by low-level meridional eddy heat flux.
- QG two-layer model of baroclinic instability possesses an optimal ratio of layer thicknesses that maximizes the growth rate.
- This optimal ratio allows one to draw a analogy between Phillips’s two-layer QG model and Charney’s continuous QG model.
- For earth-like parameters, the growth rate maximizes at a lower-layer thickness substantially less than the midheight.
* Downloads courtesy of the American Meteorological Society (AMS), who owns sole rights to them. The downloads are subject to AMS copyright laws and statutes. For more information, visit the AMS Journals website.
** Downloads courtesy of the American Geophysical Union (AGU), who owns sole rights to them. The downloads are subject to AGU copyright laws and statutes. For more information, visit the AGU website.
(updated December, 2016)