Preprints
https://doi.org/10.5194/egusphere-2022-1298
https://doi.org/10.5194/egusphere-2022-1298
 
22 Nov 2022
22 Nov 2022
Status: this preprint is open for discussion.

Waves in SKRIPS: WaveWatch III coupling implementation and a case study of cyclone Mekunu

Rui Sun1, Alison Cobb1, Ana B. Villas Bôas2, Sabique Langodan3, Aneesh C. Subramanian4, Matthew R. Mazloff1, Bruce D. Cornuelle1, Arthur J. Miller1, Raju Pathak3, and Ibrahim Hoteit3 Rui Sun et al.
  • 1Scripps Institution of Oceanography, California, USA
  • 2Department of Geophysics, Colorado School of Mines, Colorado, USA
  • 3Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
  • 4Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Colorado, USA

Abstract. In this work, we integrated the WaveWatch III model into the regional coupled model SKRIPS (Scripps–KAUST Regional Integrated Prediction System). The WaveWatch III model is implemented with flexibility, meaning the coupled system can run with or without the wave component. To demonstrate the impact of coupling we performed a case study using a series of coupled and uncoupled simulations of tropical cyclone Mekunu, which occurred in the Arabian Sea in May 2018. We examined the skill of the coupled model against the stand-alone WRF model and further investigated the impact of Langmuir turbulence in the coupled system. We found that the coupled model better captures the minimum pressure and maximum wind speed compared with the stand-alone WRF model. The characteristics of the tropical cyclone do not change significantly when using different options to parameterize the influence of waves on the ocean and the atmosphere. However, in the region of the cold wake, when Langmuir turbulence is considered in the coupled system, the sea surface temperature is about 0.5 °C colder and the mixed layer is about 20 meters deeper. This indicates the ocean model is sensitive to the parameterization of Langmuir turbulence in the coupled simulations.

Rui Sun et al.

Status: open (until 17 Jan 2023)

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Rui Sun et al.

Rui Sun et al.

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Short summary
In this work, we integrated the WaveWatch III model into the regional coupled model SKRIPS. We then performed a case study using the newly implemented model to study the tropical cyclone Mekunu, which occurred in the Arabian Sea. We found that the coupled model better simulates the cyclone than the uncoupled model, but the impact of waves on the cyclone is not significant. However, the waves change the sea surface temperature and mixed layer, especially in the cold wave due to the cyclone.