Modeling Interaction of a Tropical Cyclone with Its Cold Wake
| Autor: | Patrick A. Harr, Russell L. Elsberry, Sue Chen |
|---|---|
| Přispěvatelé: | Naval Postgraduate School (U.S.), Meteorology |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Atmosphere-ocean interaction Atmospheric Science 010504 meteorology & atmospheric sciences 010505 oceanography Mechanics Wake Enthalpy flux Atmospheric sciences 01 natural sciences Flux rate Mesoscale models Vortex Boundary layer symbols.namesake Fully coupled Tropical cyclones symbols Tropical cyclone Lagrangian Coupled models 0105 earth and related environmental sciences |
| Zdroj: | Journal of the Atmospheric Sciences. 74:3981-4001 |
| ISSN: | 1520-0469 0022-4928 |
| DOI: | 10.1175/jas-d-16-0246.1 |
| Popis: | Manuscript received 19 August 2016, in final form 25 August 2017 The article of record as published may be located at http://doi.org/10.1175/JAS-D-16-0246.1 This study first examines the tropical cyclone (TC) intensity response to its cold wake with time-invariant, stationary cold wakes and an uncoupled version of COAMPS-TC, and second with simulated cold wakes from the fully coupled version. The objective of the uncoupled simulations with the time-invariant cold wake is to fix the thermodynamic response and to isolate the dynamic response of the TC to the cold wake. While the stationary TC over a cold wake has an immediate intensity decrease, the intensity decrease with a long trailing wake from the moving TC was delayed. This time delay is attributed to a ‘‘wake jet’’ that leads to an enhanced inward transport of moist air that tends to offset the effect of decreasing enthalpy flux from the ocean. In the fully coupled version, the TC translating at ¯¹ generated a long trailing cold wake, and again the intensity decrease was delayed. Lagrangian trajectories released behind the TC center at four times illustrate the inward deflection and ascent and descent as the air parcels cross the trailing cold wake. The momentum budget analysis indicates large radial and tangential wind tendencies primarily due to imbalances among the pressure gradient force, the Coriolis, and the horizontal advection as the parcels pass over the cold wake. Nevertheless, a steadily increasing radial inflow (wake jet) is simulated in the region of a positive moisture anomaly that tends to offset the thermodynamic effect of decreasing enthalpy flux. Department of Defense High Performance Computing Modernization Program Professor Russell Elsberry was supported by the Office of Naval Research Marine Meteorology section Professor Patrick Harr was supported by the Naval Postgraduate School N0001415WX20094 N0001415WX00852 under Program Element PE062435N. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|