Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-739
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
05 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
The Effects of Sea Spray and Atmosphere–Wave Coupling on Air–Sea Exchange during Tropical Cyclone
Nikhil Garg1, Yin Kwee Eddie Ng1, and Srikanth Narasimalu2 1School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore
2Energy Research Institute (ERI@N), Nanyang Technological University, Singapore
Abstract. The study investigates the role of air–sea interface using numerical simulations of an Atlantic Hurricane Arthur (2014). More specifically, present study aims to discern the role ocean surface waves and sea spray play in modulating the intensity and structure of a tropical cyclone (TC). To investigate the effects of ocean surface waves and sea spray, numerical simulations were carried out using a coupled atmosphere–wave model where a sea spray microphysical model was incorporated within the coupled model. Furthermore, this study also explores how sea spray generation can be modelled using wave energy dissipation due to whitecaps, where whitecaps are considered as the primary mode of spray droplets generation at hurricane intensity wind speeds. Three different numerical simulations including sea state dependent momentum flux, sea spray mediated heat flux and combination of former two processes with sea spray mediated momentum flux were conducted. The foregoing numerical simulations were evaluated against the National Data Buoy Center (NDBC) buoy and satellite altimeter measurements as well as a control simulation using an uncoupled atmosphere model. The results indicate that the model simulations were able to capture the storm track and intensity, where the surface wave coupling results in a stronger TC. Moreover, it is also noted that when only spray mediated heat fluxes are applied in conjunction with sea state dependent momentum flux, they result in a slightly weaker TC, albeit stronger compared to the control simulation. However, when spray mediated momentum flux is applied together with spray heat fluxes, it results in a comparably stronger TC. The results presented here alludes to the role surface friction plays in intensification of a TC.

Citation: Garg, N., Ng, Y. K. E., and Narasimalu, S.: The Effects of Sea Spray and Atmosphere–Wave Coupling on Air–Sea Exchange during Tropical Cyclone, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-739, in review, 2017.
Nikhil Garg et al.
Nikhil Garg et al.
Nikhil Garg et al.

Viewed

Total article views: 168 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
134 30 4 168 0 2

Views and downloads (calculated since 05 Oct 2017)

Cumulative views and downloads (calculated since 05 Oct 2017)

Viewed (geographical distribution)

Total article views: 168 (including HTML, PDF, and XML)

Thereof 168 with geography defined and 0 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 22 Oct 2017
Publications Copernicus
Download
Short summary
This study investigated the effects of air-sea interaction on the lifecycle of a Hurricane Arthur (2014) that traversed through north Atlantic ocean. More specifically, this study explored the role of ocean surface waves and sea spray mediated heat and momentum fluxes on the structure and intensity of the aforementioned tropical cyclone. The sea spray fluxes were modelled using wave energy dissipation from wave model, which reduced the amount of spray fluxes as compared to the empirical SSGF.
This study investigated the effects of air-sea interaction on the lifecycle of a Hurricane...
Share