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dc.contributor.authorMontgomery, M.T.
dc.contributor.authorSmith, Roger K.
dc.date2018
dc.date.accessioned2019-01-10T16:16:02Z
dc.date.available2019-01-10T16:16:02Z
dc.date.issued2018
dc.identifier.citationM.T. Montgomery and Roger K. Smith. "Towards understanding the dynamics of spin up in Emanuel’s tropical cyclone model." Tropical Cyclone Research Report TCRR 1: 1–6 (2018)en_US
dc.identifier.urihttps://hdl.handle.net/10945/60907
dc.description.abstractWe seek to understand the mechanisms of vortex spin up in Emanuel’s 2012 axisymmetric theory for tropical-cyclone intensification in physical coordinates, starting from first principles. It is noted that, while spin up must occur in the friction layer, this spin up is unconstrained by a radial momentum equation in this layer. Rather, the spin up in this layer is constrained by a parameterization of turbulent mixing in the upper troposphere. It is shown that the inclusion of a nonlinear radial momentum equation into the theory using the assumed geometry of the Emanuel model (i.e. the assumption of a well-mixed boundary layer in terms of specific entropy and absolute angular momentum to leading order, together with the assumption that the absolute angular momentum is continuous at the top of this layer) strongly constrains the vortex evolution. If, for example, the initial radial inflow and its radial derivative are not too large in magnitude, then the boundary layer dynamics would damp this inflow and would lead to outflow just above it so that the vortex would ultimately spin down. The physics of how upper-tropospheric mixing leads to spin up in the boundary layer are unclear and, as discussed, may be irrelevant to spin up in Emanuel’s model.en_US
dc.description.sponsorshipOffice of Naval Research Globalen_US
dc.description.sponsorshipNSFen_US
dc.description.sponsorshipU. S. Naval Postgraduate Schoolen_US
dc.format.extent6 p.en_US
dc.publisherMeteorological Instituteen_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.titleTowards understanding the dynamics of spin up in Emanuel's tropical cyclone modelen_US
dc.typeArticleen_US
dc.contributor.corporateNaval Postgraduate School (U.S.)en_US
dc.contributor.departmentMeteorologyen_US
dc.subject.authorHurricaneen_US
dc.subject.authortropical cycloneen_US
dc.subject.authortyphoonen_US
dc.subject.authorboundary layeren_US
dc.subject.authorvortex intensificationen_US
dc.description.funderGrant N62909-15-1-N021en_US
dc.description.funderGrant AGS-1313948en_US
dc.description.funderN0001417WX00336en_US


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