Outside of the tropics, the dynamics of the troposphere can be separated into the problem of the zonally-symmetric circulation and the problem of the zonally-asymmetric circulation. I have worked on both problems using a variety of idealized models, like the Phillips 2-layer quasi-geostrophic model and the GFDL dry dynamical core; with a particular focus being connecting the models' internal variability to their linear responses. Where possible I compare my results with observational data.
I have investigated the connection between comprehensive climate models' internal variability and their sensitivity, which could provide a new "emergent constraint" on Earth's sensitivity. A related question is understanding models' behavior on different frequencies, which is relevant for future climate changes as well as past variations of Earth's climate.
- Lutsko, N. J. (2018) The Response of a Dry Atmosphere to ENSO-like Heating: Superrotation and the Breakdown of Linear Theory. Journal of the Atmospheric Sciences, 75(1):3 – 20. Link
- Popp, M. and Lutsko, N. J. (2017) Quantifying the zonal-mean structure of tropical precipitation. Geophysical Research Letters, 44(18):9470 – 9478 2017GL075235. Link
- Lutsko, N. J., Held, I. M., Zurita-Gotor, P. and O'Rourke, A. K. (2017). Lower Tropospheric Eddy Momentum Fluxes in Idealized Models and Reanalysis Data. Journal of the Atmospheric Sciences, 74(11):3787 – 3797. Link
- Lutsko, N. J. and Held, I. M. (2016). The Response of an Idealized Atmosphere to Orographic Forcing: Zonal vs Meridional Propagation. Journal of the Atmospheric Sciences, 73(9):3701 – 3718. Link
- Lutsko, N. J., Held, I. M., and Zurita-Gotor, P. (2015). Applying the Fluctuation–Dissipation Theorem to a Two-Layer Model of Quasi-Geostrophic Turbulence. Journal of the Atmospheric Sciences, 72(8):3161 – 3177. Link