Detection of Fronts as a Metric for Numerical Model Accuracy

Douglass, Elizabeth M.; Mask, Andrea C.

doi:10.1175/jtech-d-18-0106.1

Cited by 2 publications

(1 citation statement)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, the placement of the gliders within the US East Coast NCOM domain enables us to analyze directly the relationship between model and observations. There have been other instances of investigation in a model's capability to accurately predict observed oceanographic features (Kerry et al, 2018;Douglass and Mask , 2019). We aim to determine the spatial extent to which the Spray gliders impact the NCOM model, and further distinguish whether such impacts improve to model accuracy.…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

Characterizing the impact of underwater glider observations on the Navy Coastal Ocean Model (NCOM) in the Gulf Stream Region

Kausch¹

View full text Add to dashboard Cite

As the western boundary current of the North Atlantic, the Gulf Stream is a well established area of interest for the United States Navy, predominately due to its proximity to the continental shelf and the associated challenges of acoustic propagation across large property gradients. Autonomous underwater gliders conduct routine, high-resolution surveys along the U.S. East Coast, including within the Gulf Stream. These observations are assimilated into the operational Navy Coastal Ocean Model (NCOM). An investigation of the forecast-to-nowcast changes in the model for 2017 demonstrates the impact of the observations on the model. The magnitude of model change as a function of distance from nearest new observation reveals relatively large impact of glider observations within a radius of 𝒪(100) km. Glider observations are associated with larger local impact than Argo data, likely due to glider sampling focusing on large spatial gradients. Due to the advective nature of the Gulf Stream system, the impact of glider observations in the model is anisotropic with larger impacts extending downstream from observation locations. Forecast-to-nowcast changes in modeled temperature, salinity, and density result in improved agreement between observed and modeled ocean structure within the upper 200 m over the 24 hours between successive model runs.

show abstract

Section: Chapter 1 Introductionmentioning

confidence: 99%

Characterizing the impact of underwater glider observations on the Navy Coastal Ocean Model (NCOM) in the Gulf Stream Region

Kausch¹

View full text Add to dashboard Cite

show abstract

Detection of SST Fronts from a High-Resolution Model and Its Preliminary Results in the South China Sea

Ren

Zhu

Drévillon

et al. 2021

Journal of Atmospheric and Oceanic Technology

View full text Add to dashboard Cite

A frontal detection algorithm is developed with the capability of detecting significant frontal segments of sea surface temperature (SST) in the high resolution South China Sea Operational Forecasting System (SCSOFS). In order to effectively obtain frontal information, a gradient-based Canny edge detection algorithm is improved with post-processing designed for high resolution numerical model, aiming at extracting primary ocean fronts, meanwhile ensuring the balance of frontal continuity and positioning accuracy. Metrics of frontal probability and strength are used to measure the robustness of the results in terms of mean state and seasonal variability of frontal activities in the South China Sea (SCS). Most fronts are found in the nearshore and forming a strip shape extending from the Taiwan Strait to the coast of Vietnam. The SCSOFS is found to reproduce strong seasonal signals dominating the variability of the frontal strength and occurrence probability in the SCS. We implement the algorithm on the daily-averaged SST derived from two other SST analyses for inter-comparison in the SCS.

show abstract

Detection of Fronts as a Metric for Numerical Model Accuracy

Cited by 2 publications

References 24 publications

Characterizing the impact of underwater glider observations on the Navy Coastal Ocean Model (NCOM) in the Gulf Stream Region

Characterizing the impact of underwater glider observations on the Navy Coastal Ocean Model (NCOM) in the Gulf Stream Region

Detection of SST Fronts from a High-Resolution Model and Its Preliminary Results in the South China Sea

Contact Info

Product

Resources

About