Doppler Velocity Signatures of Idealized Elliptical Vortices

Lee, Wen-Chau; Harasti, Paul R.; Bell, Michael M.; Jou, Ben Jong‐Dao; Chang, Mou-Hsiang

doi:10.3319/tao.2006.17.2.429(a)

Cited by 10 publications

(1 citation statement)

References 24 publications

(46 reference statements)

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“…6f), the shape of the wind speed distribution is elliptic, in contrast to the more circular shape of the reflectivity distribution. The ellipticity may be due to the presence of an azimuthal wavenumber two vortex Rossby wave propagating on the azimuthal mean vorticity gradient (Montgomery and Kallenbach 1997;Lee et al 2006). The presence of a wavenumber-2 perturbation is consistent with the barotropically unstable ring vorticity structure (shown in Fig.…”

Section: B Kinematic Structurementioning

confidence: 71%

Observations of the Eyewall Structure of Typhoon Sinlaku (2008) during the Transformation Stage of Extratropical Transition

Foerster

Bell

Harr

et al. 2014

Monthly Weather Review

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A unique dataset observing the life cycle of Typhoon Sinlaku was collected during The Observing System Research and Predictability Experiment (THORPEX) Pacific Asian Regional Campaign (T-PARC) in 2008. In this study observations of the transformation stage of the extratropical transition of Sinlaku are analyzed. Research flights with the Naval Research Laboratory P-3 and the U.S. Air Force WC-130 aircraft were conducted in the core region of Sinlaku. Data from the Electra Doppler Radar (ELDORA), dropsondes, aircraft flight level, and satellite atmospheric motion vectors were analyzed with the recently developed Spline Analysis at Mesoscale Utilizing Radar and Aircraft Instrumentation (SAMURAI) software with a 1-km horizontal-and 0.5-km vertical-node spacing. The SAMURAI analysis shows marked asymmetries in the structure of the core region in the radar reflectivity and three-dimensional wind field. The highest radar reflectivities were found in the left of shear semicircle, and maximum ascent was found in the downshear left quadrant. Initial radar echos were found slightly upstream of the downshear direction and downdrafts were primarily located in the upshear semicircle, suggesting that individual cells in Sinlaku's eyewall formed in the downshear region, matured as they traveled downstream, and decayed in the upshear region. The observed structure is consistent with previous studies of tropical cyclones in vertical wind shear, suggesting that the eyewall convection is primarily shaped by increased vertical wind shear during step 2 of the transformation stage, as was hypothesized by Klein et al. A transition from active convection upwind to stratiform precipitation downwind is similar to that found in the principal rainband of more intense tropical cyclones.

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Section: B Kinematic Structurementioning

confidence: 71%

Observations of the Eyewall Structure of Typhoon Sinlaku (2008) during the Transformation Stage of Extratropical Transition

Foerster

Bell

Harr

et al. 2014

Monthly Weather Review

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Evolution of the Vorticity Contour in Vortex Energy Sources

Solovyev

2019

Springer Proceedings in Earth and Environmental Sciences

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Review of the Different Sources of Uncertainty in Single Polarization Radar-Based Estimates of Rainfall

2009

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It is well acknowledged that there are large uncertainties associated with radarbased estimates of rainfall. Numerous sources of these errors are due to parameter estimation, the observational system and measurement principles, and not fully understood physical processes. Propagation of these uncertainties through all models for which radarrainfall are used as input (e.g., hydrologic models) or as initial conditions (e.g., weather forecasting models) is necessary to enhance the understanding and interpretation of the obtained results. The aim of this paper is to provide an extensive literature review of the principal sources of error affecting single polarization radar-based rainfall estimates. These include radar miscalibration, attenuation, ground clutter and anomalous propagation, beam blockage, variability of the Z-R relation, range degradation, vertical variability of the precipitation system, vertical air motion and precipitation drift, and temporal sampling errors. Finally, the authors report some recent results from empirically-based modeling of the total radar-rainfall uncertainties. The bibliography comprises over 200 peer reviewed journal articles.

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Doppler Velocity Signatures of Idealized Elliptical Vortices

Cited by 10 publications

References 24 publications

Observations of the Eyewall Structure of Typhoon Sinlaku (2008) during the Transformation Stage of Extratropical Transition

Observations of the Eyewall Structure of Typhoon Sinlaku (2008) during the Transformation Stage of Extratropical Transition

Evolution of the Vorticity Contour in Vortex Energy Sources

Review of the Different Sources of Uncertainty in Single Polarization Radar-Based Estimates of Rainfall

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