Publication Abstracts

Montgomery et al. 2020

Montgomery, M.T., G. Kilroy, R.K. Smith, and N. Črnivec, 2020: Contribution of mean and eddy momentum processes to tropical cyclone intensification. Q. J. Roy. Meteorol. Soc., 146, no. 732, 3101-3117, doi:10.1002/qj.3837.

An idealized, three-dimensional, 1 km horizontal grid spacing numerical simulation of a rapidly intensifying tropical cyclone is used to extend basic knowledge on the role of mean and eddy momentum transfer on the dynamics of the intensification process. Examination of terms in the tangential and radial velocity tendency equations provides an improved quantitative understanding of the dynamics of the spin-up process within the inner-core boundary layer and eyewall regions of the system-scale vortex. Unbalanced and non-axisymmetric processes are prominent features of the rapid spin-up process. In particular, the wind asymmetries, associated in part with the asymmetric deep convection, make a substantive contribution (∼30%) to the maximum wind speed inside the radius of this maximum. The analysis provides a novel explanation for inflow jets sandwiching the upper-tropospheric outflow layer which are frequently found in numerical model simulations. In addition, it provides an opportunity to assess the applicability of generalized Ekman balance during rapid vortex spin-up. The maximum tangential wind occurs within and near the top of the frictional inflow layer and as much as 10?km inside the maximum gradient wind. Spin-up in the friction layer is accompanied by supergradient winds that exceed the gradient wind by up to 20%. Overall, the results affirm prior work pointing to significant limitations of a purely axisymmetric balance description, for example, gradient balance/Ekman balance, when applied to a rapidly intensifying tropical cyclone.

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BibTeX Citation

@article{mo04300i,
  author={Montgomery, M. T. and Kilroy, G. and Smith, R. K. and Črnivec, N.},
  title={Contribution of mean and eddy momentum processes to tropical cyclone intensification},
  year={2020},
  journal={Q. J. Roy. Meteorol. Soc.},
  volume={146},
  number={732},
  pages={3101--3117},
  doi={10.1002/qj.3837},
}

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RIS Citation

TY  - JOUR
ID  - mo04300i
AU  - Montgomery, M. T.
AU  - Kilroy, G.
AU  - Smith, R. K.
AU  - Črnivec, N.
PY  - 2020
TI  - Contribution of mean and eddy momentum processes to tropical cyclone intensification
JA  - Q. J. Roy. Meteorol. Soc.
VL  - 146
IS  - 732
SP  - 3101
EP  - 3117
DO  - 10.1002/qj.3837
ER  -

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