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Department of Fisheries Oceanography PhD Dissertation Defense by Siqi Li

When: Friday, December 17, 2021
2:00 PM - 3:00 PM
Where: > See description for location
Description: The School for Marine Science and Technology
Department of Fisheries Oceanography
PhD Dissertation Defense Announcement

"A Coupled FVCOM-WRF Model: applications for Hurricane Sandy"

By
Siqi Li

Advisor:
Dr. Changsheng Chen, Professor, Department of Fisheries Oceanography,
School for Marine Science and Technology, University of Massachusetts Dartmouth

Committee Members:
Dr. Geoffrey Cowles, Associate Professor, Department of Fisheries Oceanography,
School for Marine Science and Technology, University of Massachusetts Dartmouth
Dr. Kenneth Brink, Department of Physical Oceanography, Woods Hole Oceanographic Institution
Dr. Robert Beardsley, Department of Physical Oceanography, Woods Hole Oceanographic Institution
Dr. Wendell Brown, Professor, Department of Estuarine and Ocean Sciences,
School for Marine Science and Technology, University of Massachusetts Dartmouth

Friday, December 17, 2021
2:00 pm
SMAST East, Rooms 101/102
836 S Rodney French Blvd, New Bedford, MA

Abstract:
This dissertation research represents the implementation of coupling the ocean model FVCOM and the atmosphere model WRF to study the air-sea interaction during Hurricane Sandy. The research contains two parts, coding development and model applications. The two models, WRF and FVCOM are coupled into one system, with ESMF as the coupler for data transferring, interpolation, and parallel communication. Four groups of variables are transferred from atmosphere to ocean as surface meteorology forcing, which are wind stress, heat fluxes, precipitation minus evaporation, and sea level pressure, with the re-adjustment of COARE algorithm. Meanwhile, the ocean model sends the SST to the atmosphere as bottom conditions. Both the hydrostatic scheme and the non-hydrostatic one are supported in the ocean component.
The FVCOM-WRF model is validated with a real-world experiment by simulating Hurricane Sandy in 2012. First, the OML role attributing to hurricane simulation is studied by applying the WRF with OML scheme. The comparison results between the cases with and without OML scheme show that including the OML dynamics enhanced the contribution of vertical mixing to the air-sea heat flux, thus leading to a better estimation of the center track and intensity. When the
FVCOM-WRF model is applied, a large improvement in the hurricane pathway and intensity, compared with the WRF case without OML. The simulated center location was slightly better than those when OML scheme was included, while the center pressure results were more underestimated with 0.5 hPa larger on mean error. Applying the FVCOM-WRF with the non-hydrostatic scheme in the ocean with a 2-km resolution grid in the max-wind zone can resolve convection. The non-hydrostatic ocean scheme could improve the hurricane intensity by 0.8 hPa on mean error. When the hurricane approached the ocean domain, the mean error of minimum pressure was reduced by 1.3 hPa. The pathway of non-hydrostatic case did not
simulate as well as the hydrostatic one. With the intrusion of non-hydrostatic scheme, the storm-induced mixing was much larger, with larger vertical velocity and 10~20-m deeper mixed layer depth.
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Please contact Sue Silva at s1silva@umassd.edu for additional information.
Contact: > See Description for contact information
Topical Areas: SMAST Seminar Series, School for Marine Sciences and Technology