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Master’s Thesis Defense: Mr. James Ryan
July 31, 2020 @ 1:00 pm - 2:00 pm
Due to the COVID-19 Pandemic, the University has instruction to cancel all in-person events through the Spring semester to adhere to city and state orders limiting public gatherings. Events still running must now take place Online— listed events will include a link in which one may access the Online webspace:
To view Mr. Ryan’s defense, enter his Online chatroom via Google Meet— it will open one hour prior to the event at 1:00 pm on Friday, July 31.
Biennial Variability and ENSO
Mr. James Ryan
University of Wisconsin-Milwaukee
MS Graduate Student – Teaching Assistant
“Quasibiennial cycles in ENSO (El Nino-Southern Oscillation) have proven to be mysterious in our understanding and predictability of this important teleconnection. Sources for ENSO’s irregularity, including recharge mechanisms and ocean’s slow responses compared to the atmosphere, seem to be irregular, with spectral peaks at 4-7 years. However, a quasibiennial bandpass filter reveals that cycles that repeat every 18-42 months play a major role, despite their lesser role on the power spectrum, letting major ENSO events have spikes of biennial variability, even if it’s not every two years. Observations are then compared against major climate models to assess their handling of ENSO.”
Committee Members:
Profs. Clark Evans, Sergey Kravtsov, Paul Roebber
