Atmospheric Wave Interactions and Hurricane Formation
University of Miami
Advisor: Dr. Sharanya Majumdar
Funding Sources: NSF Graduate Research Fellowship, University of Miami Dean's Fellowship
Years Active: August 2019 - Present
Tropical cyclones (TCs) that form in the Atlantic basin can have devastating impacts on communities. The predictability of these TCs is heavily influenced by the basic processes that govern their formation (or “genesis”). While genesis is thankfully infrequent, certain features can make it more likely. In the Atlantic basin, support is often provided by African Easterly Waves (AEWs); around 61% of TCs in the Atlantic are the direct result of AEWs . Furthermore, recent studies have indicated that another kind of atmospheric wave -- Convectively-Coupled Kelvin Waves (CCKWs) -- can also have impacts on tropical cyclone formation .
For my PhD research at the University of Miami, I am studying the interactions between AEWs and CCKWs in the Atlantic and their impact on hurricane formation. One way I am doing so is via ERA5 reanalysis data. I also will be collaborating with researchers at NOAA's Hurricane Research Division (HRD) to study aircraft observations of hurricane formation during these wave interactions. Ultimately, I hope to better illuminate how interactions between AEWs and CCKWs can make hurricane formation more or less likely, and better understand how predictable these processes might be!
Below Animation: Animation of convection (grey contours, 700 hPa "omega") associated with an African Easterly Wave (center and track given by star and black line, respectively) as it moves through a Kelvin wave (CCKW). The Kelvin wave is represented by the background contour shading, with blue-like shading indicating the convectively-favorable phase of the CCKW, and red-like shading indicating the convectively-suppressed phase.
 Russell, A., et al., Geophys. Res. Lett., 44, 1 (2017)
 Schreck, C. J. III, 2015: Kelvin Waves and Tropical Cyclogenesis: A Global Survey, Mon. Wea. Rev., 143, 3996-4011.
 Thorncroft, C. D. and A. Brammer, 2016: On the Influence of Convectively Coupled Kelvin Waves on African Easterly waves. 32nd Conference on Hurricanes and Tropical Meteorology, AMS.
Lawton, Q. A., and S. J. Majumdar, 2023: Convectively Coupled Kelvin Waves and Tropical Cyclogenesis: Connections through Convection and Moisture. Mon. Wea. Rev., In Press, https://doi.org/10.1175/MWR-D-23-0005.1.
Lawton, Q. A., S. J. Majumdar, K. Dotterer, C. Thorncroft, and C. J. Schreck, 2022: The Influence of Convectively Coupled Kelvin Waves on African Easterly Waves in a Wave-Following Framework. Monthly Weather Review, 150(8), 2055-2072, doi: https://doi.org/10.1175/MWR-D-21-0321.1.