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dc.contributor.authorLussier, L.L.
dc.contributor.authorMontgomery, M.T.
dc.contributor.authorBell, M.M.
dc.date.accessioned2015-08-06T22:47:53Z
dc.date.available2015-08-06T22:47:53Z
dc.date.issued2014
dc.identifier.citationAtmos. Chem. Phys., 14, 8795–8812, 2014en_US
dc.identifier.urihttp://hdl.handle.net/10945/45980
dc.descriptionThe article of record as published may be located at http://dx.doi.org/10.5194/acp-14-8795-2014en_US
dc.description.abstractAircraft reconnaissance data collected during the Tropical Cyclone Structure 2008 field campaign are used to examine further kinematical, dynamical, and thermodynamical aspects of the genesis of Typhoon Nuri. Data from the first two missions into the pre-Nuri disturbance document the transition from a tropical wave to a tropical depression. Dropwindsonde-derived tangential wind profiles at several radii from the low-level circulation center indicate that the magnitude of low-level circulation increases and that the corresponding tangential velocity maximum moves inward from the first to second reconnaissance mission. To compliment these findings, a three-dimensional variational analysis incorporating both dropwindsonde and aircraft Doppler radar data is conducted. These data are used to perform circulation tendency calculations at multiple distances from the lowlevel circulation center. The results demonstrate a net spinup of the system-scale circulation in the low levels near the center and in the outer regions of the recirculating Kelvin cat’s eye circulation. In these regions, the spin-up tendency due to the influx of cyclonic absolute vorticity exceeds the frictional spin-down tendency for both Nuri missions. The system-scale spin-up is found to be accompanied by areas of low-level vorticity concentration through vortex-tube stretching associated with cumulus convection. The areal coverage and intensity of these high-vorticity regions increase between the first and second Nuri missions. The findings of this study are consistent in some respects to the Nuri observational analysis carried out by Raymond and López-Carrillo (2011), but differ in their suggested key results and related scientific implications that the pre-Nuri disturbance was spinning down in the planetary boundary layer on the first day of observations. The findings herein strongly support a recent tropical cyclogenesis model positing that the Kelvin cat’s eye circulation of the parent wavelike disturbance provides a favorable environment for convective vorticity organization and low-level spin-up on the mesoscale.en_US
dc.description.sponsorshipLou Lussier acknowledges the support from the National Research Council (NRC), through its Research Associateship Program, and the host institution, the Naval Postgraduate School (NPS) in Monterey, California. The work of all authors was partially supported by the Office of Naval Research (ONR), through award N0001411WX20095, and by the National Science Foundation (NSF), through awards AGS 0733380 and 0851077. The ELDORA and dropwindsonde data for this study were provided by NCAR/EOL under sponsorship of the National Science Foundation.en_US
dc.publisherCopernicus Publications on behalf of the European Geosciences Union.en_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.titleThe genesis of Typhoon Nuri as observed during the Tropical Cyclone Structure 2008 (TCS-08) field experiment - Part 3: Dynamics of low-level spin-up during the genesisen_US
dc.typeArticleen_US
dc.contributor.departmentMeteorology


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