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dc.contributor.authorHuang, Yi-Hsuan
dc.contributor.authorWu, Chun-Chieh
dc.contributor.authorMontgomery, Michael T.
dc.date10/01/2018
dc.date.accessioned2018-10-10T17:42:58Z
dc.date.available2018-10-10T17:42:58Z
dc.date.issued2018-10
dc.identifier.citationHuang, Yi-Hsuan, Chun-Chieh Wu, and Michael T. Montgomery. "Concentric Eyewall Formation in Typhoon Sinlaku (2008). Part III: Horizontal Momentum Budget Analyses." Journal of the Atmospheric Sciences 75.10 (2018): 3541-3563.
dc.identifier.otherDTIC Id134228
dc.identifier.urihttp://hdl.handle.net/10945/60233
dc.descriptionPart I may be found at https://doi.org/10.1175/MWR-D-11-00057.1
dc.descriptionPart II may be found at http://hdl.handle.net/10945/36865
dc.descriptionThe article of record as published may be found at https://doi.org/10.1175/JAS-D-18-0037.1en_US
dc.description.abstractThis is a follow-up work to two prior studies examining secondary eyewall formation (SEF) in Typhoon Sinlaku (2008). This study shows that, in the SEF region, the majority of the elevated winds are supergradient. About two-thirds of the rapid increase in tangential wind tendencies immediately prior to SEF are attributed to agradient wind tendencies. This suggests the importance of nonlinear, unbalanced dynamical processes in SEF in addition to the classical axisymmetric balanced response to forcings of heating and momentum. In the SEF region, analyses show two distinct responsible processes for the increasing azimuthal tangential wind in two vertical intervals. Within the boundary inflow layer, the competing effect between the mean radial influx of absolute vorticity and deceleration caused by surface friction and subgrid diffusion yields a secondary maximum of positive tendency. Analyses further demonstrate the major impact of the mean radial influx of absolute vorticity on SEF. Above the boundary inflow layer, the vertical advection acts to vertically extend the tangential wind jet via the lofting of the enhanced tangential momentum farther upward. The roles of the nonlinear unbalanced dynamics in these two processes are discussed in this paper. From a Lagrangian per- spective, the persistently increasing agradient force outweighs the frictional loss, effectively decelerating boundary layer inflowing air across the SEF region. This explains the sharpening of the radial gradient of boundary layer inflow, which is shown to be responsible for the buildup of a zone with concentrated boundary layer convergence. The previously proposed unbalanced dynamical pathway to SEF is elaborated upon and supported by the current results and discussion.en_US
dc.description.sponsorshipMinistry of Science and Technology, Taiwan
dc.description.sponsorshipDivision of Atmospheric and Geospace Sciences
dc.description.sponsorshipOffice of Naval Research Global
dc.language.isoen_US
dc.publisherAmerican Meteorological Society
dc.titleConcentric Eyewall Formation in Typhoon Sinlaku (2008) - Part III: Horizontal Momentum Budget Analysesen_US
dc.typeArticleen_US
dc.contributor.departmentMeteorology
dc.description.funderMTM acknowledges the support of NSF AGS-1313948, Office of Naval Research N0001417WX00336, and the U.S. Naval Postgraduate School.


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