[Eoas-seminar] COAPS Short Seminar Series

[eoas-seminar at lists.fsu.edu]

COAPS Short Seminar Series
11:00 AM June 1st
Attend F2F (in 255 Research A) or Virtually (via Zoom)
https://fsu.zoom.us/j/92268262553

Meeting ID: 922 6826 2553
Talks are 12 minutes long with an additional 8 minutes for questions.

Analysis of Extreme Minimum Temperatures in the Southeast
By Hailey Long
Description: This project analyzes long-term trends in nighttime minimum temperatures across fifty weather stations in the Southeastern United States from 1950–2025. Annual counts of warm nights (minimum temperatures above 75°F), diurnal temperature range (DTR) values, and some dew point temperature trends were examined to investigate how nighttime warming has changed over time and across regions. Results show widespread increases in warm nights and decreasing DTR slope values, especially in southern coastal areas, indicating that nighttime temperatures are rising faster than daytime temperatures and increasing regional heat risk, which may be due to increased atmospheric moisture.

Decomposing Atmospheric Response to Mesoscale Eddies: Roles of Thermal Gradients and Air–Sea Temperature Contrast
By Marco Larranaga
Description: Mesoscale eddies strongly modulate the overlying atmosphere through air-sea thermal feedbacks, yet the relative roles of sea surface temperature (SST) gradients and air-sea temperature contrast remain difficult to disentangle. Here, we quantify the atmospheric response over composite warm and cold mesoscale eddies using five years of global observations of wind stress and SST, together with near-surface atmospheric temperature from ERA5. At each grid point of the composite eddies, we estimate multivariate linear and robust regression models to derive coupling coefficients linking wind stress curl and divergence to along-wind and cross-wind SST gradients, as well as to the air–sea temperature difference. For wind stress curl, we find a strong intercept term, comparable in magnitude to the cross-wind SST gradient coupling coefficient. The remaining thermal coupling coefficients are weak for both warm and cold eddies. The large intercept suggests that wind stress curl is substantially influenced by processes not explicitly represented by SST gradients or air–sea temperature contrast, likely reflecting the contribution of current feedback, which can independently generate curl anomalies over mesoscale eddies. In contrast, wind stress divergence exhibits a small intercept, a dominant along-wind SST gradient coupling coefficient, and a secondary but significant contribution from the air–sea temperature difference, while the cross-wind SST gradient contribution is negligible. These results indicate that wind stress curl–based coupling coefficients may be partially contaminated by current feedback, complicating their interpretation as purely thermal atmospheric responses. Wind stress divergence, on the other hand, provides a cleaner diagnostic of thermal feedback over mesoscale eddies.

NOTE: Please feel free to forward/share this invitation with other groups/disciplines that might be interested in this talk/topic. All are welcome to attend.
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