Figure 11. Hodograph of the Earth-relative horizontal winds and its deep-layer mean obtained from the VTD analysis (VM) and the 12-hour mean motion of Hurricane Gloria (1985), VH. (From Lee et al., 1994.)

GBVTD analysis, Typhoon Nari (2001) using the EGBVTD technique (Liou et al., 2006), and Cyclone Tina (2002) (Roux et al., 2004) using the GB-EVTD technique. The structures of these landfalling TCs were consistent with previous studies but revealed detailed evolution of TCs (—6-15 minute interval) compared with those deduced from airborne dual Doppler radar data (—30-60minute interval). Typical typhoon inner core structures are illustrated in Figs. 13(a) and 13(b). Lee et al. (2000) took the axisymmetric structure a step further to compute angular momentum and cyclostropic perturbation pressure in Alex (Fig. 13). The angular momentum pattern [Fig. 13(c)] is near-upright in the eyewall, similar to those deduced from dual Doppler analysis in Hurricane Norbert [Fig. 12(f) in Marks et al. 1992]. The retrieved perturbation surface pressure at the center [Fig. 13(d)] is 23hPa lower than the pressure at 60 km radius. The radial perturbation pressure pattern compared favorably with the pressure pattern derived from surface pressure measurements assuming axisymmetric

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