期刊名称：Tellus A: Dynamic Meteorology and Oceanography
电子版ISSN：1600-0870
出版年度：2020
卷号：72
期号：1
页码：1-27
DOI：10.1080/16000870.2020.1721215
摘要：Hurricane Ophelia was a category 3 hurricane which underwent extratropical transition and made landfall in
Europe as an exceptionally strong post-tropical cyclone in October 2017. In Ireland, Ophelia was the worst
storm in 50 years and resulted in significant damage and even loss of life. In this study, the different physical
processes affecting Ophelia’s transformation from a hurricane to a mid-latitude cyclone are studied. For this
purpose, we have developed software that uses OpenIFS model output and a system consisting of a
generalized omega equation and vorticity equation. By using these two equations, the atmospheric vertical
motion and vorticity tendency are separated into the contributions from different physical processes: vorticity
advection, thermal advection, friction, diabatic heating, and the imbalance between the temperature and
vorticity tendencies. Vorticity advection, which is often considered an important forcing for the development
of mid-latitude cyclones, is shown to play a small role in the re-intensification of the low-level cyclone.
Instead, our results show that the adiabatic upper-level forcing was strongly amplified by moist processes,
and thus, the diabatic heating was the dominant forcing in both the tropical and extratropical phases of
Ophelia. Furthermore, we calculated in more detail the diabatic heating contributions from different model
parameterizations. We find that the temperature tendency due to the convection scheme was the dominant
forcing for the vorticity tendency during the hurricane phase, but as Ophelia transformed into a mid-latitude
cyclone, the microphysics temperature tendency, presumably dominated by large-scale condensation,
gradually increased becoming the dominant forcing once the transition was complete. Temperature tendencies
caused by other diabatic processes, such as radiation, surface processes, vertical diffusion, and gravity wave
drag, were found to be negligible in the development of the storm.
