Orli Lachmy's homepage

I am an Atmospheric Scientist, working as a postdoctoral fellow in Prof. Tiffany Shaw's group at the Department of Geophysical Sciences, University of Chicago. I am interested in the dynamics of the general circulation of the atmosphere.

The atmospheric circulation is both fascinating in its complex behavior and affecting our everyday life. The distribution of climate zones results from the configuration of Earth's atmospheric circulation. Year-to-year variations in the regional climate result from the variability of the circulation. The regional effects of global warming, as predicted by climate models, depend on the response of the circulation to increased greenhouse gas emissions.

Atmosphere dynamics research has done a huge step forward in the past few decades, with increased computational power. The challenge facing our field is to utilize numerical models to improve our understanding, on one hand, and to implement our theoretical knowledge to improve model reliability, on the other hand.

My research focuses on improving our theoretical understanding of the interactions between the zonal mean flow and eddies, and their affect on internal climate variability. Together with Prof. Nili Harnik, we have constructed a new idealized numerical model, which includes only the basic components needed to capture the qualitative nature of the circulation cells, the jet stream, the midlatitude eddies and all their mutual interactions. We used this model to explain the mechanisms maintaining the different flow regimes of the jet stream.


    2015: PhD in Atmospheric Sciences. Tel-Aviv University, Israel. 
Supervisor: Prof. Nili Harnik.
Title: "Atmospheric extratropical wave-mean flow interactions maintaining the different flow regimes of the jet stream"

    2008: M.Sc in Atmospheric Sciences. Tel-Aviv University, Israel.
Supervisor: Prof. Nili Harnik
Title: "A wave amplitude transition in a quasi-geostrophic wave-mean flow interaction system"

    2004: B.Sc. in Physics. The Hebrew University, Jerusalem, Israel.


    2012: Scholarship for promoting women in science, Israel Ministry of Science and Technology.

    2009: The Rector and President scholarship for excellent research students, Tel-Aviv University.


Lachmy, O. and N. Harnik, 2016: "Wave and jet maintenance in different flow regimes", Journal of the Atmospheric Sciences, 73, 2456-2484.  

Harnik, N., C. L. Garfinkel and O. Lachmy, 2016: "The influence of the jet stream regime on extreme weather events", Dynamics and Predictability of Large-Scale, High-Impact Weather and Climate Events 2, 79. Ed. Li, J., R. Swinbank, H. Volkert and R. Grotjahn. Cambridge University Press.

Lachmy, O. and N. Harnik, 2014: "The transition to a subtropical jet regime and its maintenance", Journal of the Atmospheric Sciences, 71, 1389-1409.

Lachmy, O. and N. Harnik, 2009: "A wave amplitude transition in a quasi-linear model with radiative forcing and surface drag", Journal of the Atmospheric Sciences, 66, 3479-3490.

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