[Eoas-seminar] COAPS Short Seminar Series

Tue Oct 1 11:28:04 EDT 2024

COAPS Short Seminar Series
11:00 AM October 7th
Attend F2F (in 255 Research A) or Virtually (via Zoom)
https://fsu.zoom.us/j/92268262553

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

AMOC–Gulf Stream relationship on sub-annual timescales in an eddying North Atlantic ensemble
By Givo Alsepan
Description: Observational studies have revealed significant Gulf Stream (GS) variability on monthly or longer timescales that affects climate over the Northern Hemisphere. Recently, a high degree of variability in the Atlantic Meridional Overturning Circulation (AMOC) has also been observed on these monthly timescales, suggesting a possible connection between the GS and AMOC. However, their exact relationship in modeling studies remains poorly understood partly due to the lack of eddy-scale resolution. Here the patterns of covariability between monthly sea surface temperature (SST) and AMOC streamfunction anomalies in the North Atlantic sector are investigated as a function of time lag using an ensemble of eddy-resolving North Atlantic model simulations. Our results reveal that statistically significant covariances are found when AMOC leads SST by several months. A large-scale tripolar SST pattern in spring is associated with a broad positive AMOC signal over most of the domain during the preceding early winter, which has been previously associated with the North Atlantic Oscillation imprints. Interestingly, over the GS a significant variability of SST and its meridional gradient in winter is associated with the dominant mode of AMOC variability during the preceding early fall. The spatial pattern of AMOC in this early fall is different compared to that in early winter, where the former exhibits a tripole mode in the North Atlantic: a pattern with positive AMOC streamfunction anomaly near the equator and north of 35°N and negative anomaly near the subtropic that extends from the surface to the deep ocean of ~3–4 km. The significant lag relations between AMOC and GS SST may shed light on the potential AMOC influence to the mid-latitude atmosphere via the GS on sub-annual timescales.

Height Adjustment of IWRAP Wind Speed: Analyzing Boundary Layer Assumptions and Near-Surface Vertical Wind Profiles in Atlantic Tropical Cyclones
By Maggie Zoerner
Description: This project assesses the height adjustment of IWRAP (Imaging Wind and Rain Airborne Profiler) wind speed measurements from various altitudes in Atlantic tropical cyclones, considering different boundary layer assumptions. A secondary objective is to investigate the patterns of near-surface vertical wind profiles and associated features to enhance understanding of the dynamics in the boundary layer.

Science Goals Related to Spray Modification of Hurricane Winds and Turbulent Fluxes
By Amelia Bryan
This project builds on the work of a previous masters student, Danny Wallace who used data collected from dropsondes in tropical cyclones to conduct a log-profile analysis for wind speed, potential temperature, and humidity in order to estimate surface fluxes of momentum, sensible heat, and latent heat. This project works toward improving these estimates by improving the estimations of roughness length.

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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