Analysis of sensitivity to different parameterization schemes for a subtropical cyclone

Hernández, Lara Quitián; Fernández‐González, Sergio; González-Alemán, Juan Jesús; Valero, Francisco; Martín, María Luisa Novo

doi:10.1016/j.atmosres.2018.01.001

Cited by 8 publications

(10 citation statements)

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“…Consequently, this presents a novel and interesting case study to analyze. Thus, with reference the sensitivity study of Quitián‐Hernández et al (2018) and the present results, we analyzed different fields to ascertain if the examined STC underwent a warm seclusion process. Regarding this TT paradigm, a strong near‐surface easterly flow to the north of the system plays a critical role in TC development (Galarneau et al, 2015).…”

Section: Introductionmentioning

confidence: 83%

“…Domain 1 (D01) had 217 × 150 grid points in the west‐east and south‐north directions, respectively, whereas Domain 2 (D02) had 237 × 180 grid points in the same directions. In order to maintain consistency with respect to the previous work of Quitián‐Hernández et al (2018), on which this work is based, the same WRF configuration is here used and described below. The initial/boundary conditions used for the STC simulation were taken from the National Centers for Environmental Prediction Global Forecast System analysis with 1° horizontal resolution at each 6 hr.…”

Section: Domain Specification and Wrf Model Setupmentioning

confidence: 99%

“…Based on various scheme combinations that were tested in our previous study (Quitián‐Hernández et al, 2018; tested combinations can be found in Table 1), we used the WSM6 scheme as the microphysical parameterization, Dudhia and RRTM schemes as the shortwave and longwave radiation parameterizations, respectively, and the Tiedtke as the cumulus parameterization scheme. Readers may refer to Quitián‐Hernández et al (2018) for detailed comparison of different combinations.…”

Section: Domain Specification and Wrf Model Setupmentioning

confidence: 99%

“…Finally, to cover the entire STC life cycle, the period of integration extended from 1200 UTC on 18 October 2014 through 0000 UTC on 23 October 2014 (more information about the experimental design is in Quitián‐Hernández et al, 2018). To analyze the impact of surface turbulent heat fluxes during STC evolution, an additional STC simulation was executed in the same way as the first, but the presence of heat fluxes was eliminated.…”

Section: Domain Specification and Wrf Model Setupmentioning

confidence: 99%

“…Rapid deepening, very characteristic of such systems, requires optimal numerical models to improve their prediction. Quitián‐Hernández et al (2018) conducted a sensitivity analysis of diverse parameterization schemes using the Weather Research and Forecasting (WRF) model for the genesis and intensification of the aforementioned STC.…”

Section: Introductionmentioning

confidence: 99%

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Subtropical Cyclone Formation via Warm Seclusion Development: The Importance of Surface Fluxes

et al. 2020

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Subtropical cyclones (STCs) are characterized by a thermal hybrid structure with tropical and extratropical features. STCs are considered a numerical modeling challenge because of their rapid intensification. A fundamental part of their strength is derived from diabatic processes associated with convection and heat fluxes from the ocean. This study evaluates the importance of surface turbulent heat fluxes during the transition of an extratropical precursor into a STC. This cyclone evolved embedded within a strong meridional flow, having a Shapiro-Keyser structure and undergoing a warm seclusion process. To assess the importance of those heat fluxes, two Weather Research and Forecasting simulations were defined considering the presence and absence of those fluxes. Results of both simulations reveal a warm seclusion process, which weakened in absence of the heat fluxes. During the system genesis and in absence of heat fluxes, the wind and rainfall values were increased due to the remarkably intense area of frontogenesis to the northwest. Given these results and the lack of transition in the absence of heat fluxes, the frontal nature of the system was verified. Considering the heat fluxes, the obtained potential vorticity values diminished, reducing wind shear and intensifying convection in the system, which favored its transition into an STC. This study is groundbreaking in that no STC has been linked to a warm seclusion process in the Eastern North Atlantic. Additionally, simulated wind field shows an underestimation in comparison with Atmospheric Motion Vectors, used as observational data so as to give a weight to the wind analysis.

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Section: Introductionmentioning

confidence: 83%

Section: Domain Specification and Wrf Model Setupmentioning

confidence: 99%