Departures from axisymmetric balance dynamics during secondary eyewall formation

dc.contributor.authorAbarca, Sergio F.
dc.contributor.authorMontgomery, Michael T.
dc.contributor.corporateNaval Postgraduate School (U.S.)en_US
dc.contributor.departmentMeteorologyen_US
dc.date.accessioned2017-04-07T16:52:24Z
dc.date.available2017-04-07T16:52:24Z
dc.date.issued2014-10
dc.descriptionThe article of record as published may be found at http://dx.doi.org/10.10.1175/JAS-D-14-0018.1en_US
dc.description.abstractDepartures from axisymmetric balance dynamics are quantified during a case of secondary eyewall formation. The case occurred in a three-dimensional mesoscale convection-permitting numerical simulation of a tropical cyclone, integrated from an initial weak mesoscale vortex in an idealized quiescent environment. The simulation exhibits a canonical eyewall replacement cycle. Departures from balance dynamics are quantified by comparing the azimuthally averaged secondary circulation and corresponding tangential wind tendencies of the mesoscale integration with those diagnosed as the axisymmetric balanced response of a vortex subject to diabatic and tangential momentum forcing. Balance dynamics is defined here, following the tropical cyclone literature, as those processes that maintain a vortex in axisymmetric thermal wind balance. The dynamical and thermodynamical fields needed to characterize the background vortex for the Sawyer-Eliassen inversion are obtained by azimuthally averaging the relevant quantities in the mesoscale integration and by computing their corresponding balanced fields. Substantial differences between azimuthal averages and their homologous balance-derived fields are found in the boundary layer. These differences illustrate the inappropriateness of the balance assumption in this region of the vortex (where the secondary eyewall tangential wind maximum emerges). Although the balance model does broadly capture the sense of the forced transverse (overturning) circulation, the balance model is shown to significantly underestimate the inflow in the boundary layer. This difference translates to unexpected qualitative differences in the tangential wind tendency. The main finding is that balance dynamics does not capture the tangential wind spinup during the simulated secondary eyewall formation event.en_US
dc.format.extent18 p.en_US
dc.identifier.citationS.F. Abarca, M.T. Montgomery, "Departures from axisymmetric balance dynamics during secondary eyewall formation," Journal of the Atmospheric Sciences, v. 71 (October 2014), pp.3723-3738en_US
dc.identifier.urihttps://hdl.handle.net/10945/52554
dc.publisherAmerican Meteorological Societyen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleDepartures from axisymmetric balance dynamics during secondary eyewall formationen_US
dc.typeArticleen_US
dspace.entity.typePublication
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