Upcoming Research Projects

Rossby wave propagtion and extreme events

Collaborators: Virginie Guemas, Louis-Philippe Caron, Barcelona Supercomputing Center; Prof. David Battisti, Uni. of Washington; Prof. Libby Barnes, Colorado State University

At the end of 2018 I will take up a Marie Sklodowska-Curie Individual Fellowship at the Barcelona Supercomputing Center, Spain. I will be looking at the connections between Rossby wave propagation and extreme weather events such as heat waves, cold snaps, heavy precipitation events, and droughts. By studying the seasonal predictability of Rossby wave propagation pathways, I will study how this may be used to provide enhanced seasonal predictability of the probability of extreme events.

The Stratosphere in the Last Glacial Maximum

Collaborators: Prof. Qiang Fu, Prof. Becky Alexander, Prof. David Battisti, Uni. of Washington; Prof. Aditi Sheshadri, Stanford University

A recent NSF grant has been awarded to PIs Fu, Alexander and Battisti to use the WACCM model to study the impacts of Last Glacial Maximum (LGM) geometry (in particular the Laurentide ice sheet) and chemistry changes on atmospheric circulation and chemistry, with particular focus on the role of the stratosphere. I am currently running the WACCM model in the LGM configuration in preparation for this research.

Current Research Projects

Impacts of Mountain ranges on climate variability

Collaborators: Prof. Aditi Sheshadri, Stanford University; Casey Hilgenbrink, Prof. David Battisti, Uni. of Washington;

Using the CESM, WACCM, and ECHAM models we are investigating the role that different orographic regions play on atmospheric circulation and variability. In particular we are studying the impact on the stratospheric circulation, and on the preferred jet regimes on the Atlantic eddy-driven jet. We find that the Mongolian mountains have the greatest impact on stratospheric circulation and Sudden Stratospheric Warmings.

Cross-equatorial heat fluxes and ITCZ shifts: sensitivity to forcing location.

Collaborators: Prof. Dargan Frierson, Prof. Cecilia Bitz, Ashly Spevacek, Uni. of Washington; Prof Sarah Kang, Ulsan National Institute of Science and technology

Together with Dargan Frierson, Cecilia Bitz, and Ashly Spevacek, we have been awarded an NSF grant to study the impacts of forcing location on cross-equatorial heat fluxes, and associated ITCZ shifts. By placing anomalous surface heat fluxes in localized region of coupled GCMs, we are exploring the ocean and atmospheric thermodynamic response to these forcings.

Tracking Precipitation Events

Collaborators: Prof. David Battisti, Uni. of Washington; Dr. Gregor Skok, Uni of Ljubljana.

Used an event-tracking algorithm we track all events in the TRMM 3B42 3-hourly precipitation data, as well as 3-hourly ERA-interim precipitation from 1980-2015. We find an increase in the number of events that last 1-2 and 2-5 days over the lifetime of the TRMM satellite. More details, including access to the event tracking code, output data, analysis code, and some results can be found here.

Mongolian Mountains Matter Most

Using the CESM model I am investigating the role that different orographic regions play on atmospheric and ocean circulations. One of my main findings is that, despite their greater extent and height, the Tibetan plateau and Himalaya mountain range have a much smaller impact on the wintertime Pacific jet than the smaller Mongolian mountains farther to the north. You can read more about this in our paper. A paper currently in preparation looks at the roles different mountain regions play in affecting the climate of the North Atlantic and western Europe.