Typhoon 9707 observations with the MU radar and L-band boundary layer radar

Teshiba, Michihiro; Hashiguchi, Hiroyuki; Fukao, S.; Shibagaki, Yoshiaki

doi:10.5194/angeo-19-925-2001

Cited by 22 publications

(11 citation statements)

References 12 publications

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“…Similar features of radial wind were found in Fig. 7, and also reported by Jorgensen (1984a), Tabata et al (1992), Teshiba et al (2001), and Shibagaki et al (2003). Cyclonic winds gradually became stronger in time over both stations, and, in particular, the horizontal gradient of the cyclonic wind was large in the main rainbands, that is the rainbands were developed where the horizontal shear of the cyclonic wind was strong.…”

Section: Characteristics Of Storm-relative Wind Behaviorsupporting

confidence: 70%

Secondary circulation within a tropical cyclone observed with L-band wind profilers

et al. 2004

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Abstract. In association with the passage of a Tropical Cyclone (TC) around Japan, the secondary circulation in the region from the outer side to the center was investigated in detail by two separately located L-band wind profilers and the rawinsonde observations from 1 to 2 October 2002, for the first time. As the wind profilers can observe wind fields not only within rainbands but also in between, the mesoscale wind circulation including the vertical wind component in wide areas from the lower layer to the upper layer was investigated.While the TC center approached the profiler stations, several rainbands associated with the TC subsequently passed. Relatively warm, moist inflow with a cyclonic rotation was observed in the lower-troposphere while the TC center approached. The inflow reached the inside of the main rainband where the updraft was observed. Above 5-km height (with temperature below 0 • C), outflow and weak downdraft corresponding to falling frozen particles were observed. It is considered that the frozen particles formed precipitating clouds mainly in the outer rainband region. The continuous wind circulation transported water vapor from the lower troposphere to the upper troposphere via the vicinity of TC center.On the other hand, after the passage of the TC center, the developed rainband passed, which was located in the south and southwest quadrant of the TC. It is suggested with the profilers' data that the rainband was intensified mainly by warm and moist outflow below 3-km height.

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Section: Characteristics Of Storm-relative Wind Behaviorsupporting

confidence: 70%

Secondary circulation within a tropical cyclone observed with L-band wind profilers

et al. 2004

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“…Detailed kinematic structures within and around rainbands have been clarified in the VHF-band radar observation (May 1996;May et al 1994;Teshiba et al 2001). In this study, we successfully observed Typhoon 9426 (Orchid) by the MU (middle and upper atmosphere) radar of the VHF band at Shigaraki, Shiga, Japan (136.10 E, 34.85 N) on 29-30 September 1994, the center of which almost passed over the radar site.…”

Section: Introductionmentioning

confidence: 82%

Meso-.ALPHA.-Scale Wind Field and Precipitating Clouds in Typhoon 9426 (Orchid) Observed by the MU Radar

Shibagaki

Yamanaka

Kita-Fukase³

et al. 2003

Journal of the Meteorological Society of Japan

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A general structure of Typhoon 9426 (Orchid) up to the lower stratosphere including the inner core region was observed by the MU (middle and upper atmosphere) radar on 29-30 September 1994. In this paper, a meso-a-scale wind field and meso-b and -g scale features of precipitating clouds in the typhoon were investigated.The kinematic structure in the front and rear of the typhoon was quite different because of its transition from mature to decaying stages and an asymmetric distribution of cloud and precipitation. In front of the typhoon, the meso-a-scale wind field was characterized by a cyclonic rotation with the maximum at low level, outflow regions tilted outward with height, and vertical motions affected by convection and topography. In the vicinity of the typhoon center, the tangential wind had a vertical spiral structure for the center, considered to be the result from deformation of the center of the decaying typhoon. In the rear of the typhoon without precipitating clouds, the cyclonic wind became weak, and the outflows and vertical motions as seen in the front were not detected. In front of the typhoon, an eyewall and wide rainband were observed. In the eyewall, a meso-g-scale remarkable updraft associated with an outflow region, considered to be a part of vertical circulation, was found in the upper troposhere. The outflow region tilted outward was originated from the area of maximum radial shear of the low-level cyclonic wind. It was extended to an updraft region within an upperlevel band-shaped cloud, located far from the typhoon center. The wide rainband (50-70 km width) was located at the outer edge of the band-shaped cloud, and it lasted in the development of the upper-level cloud. It was accompanied by the tilted outflow region to 6 km altitude, the bottom of which was located at the maximum of the cyclonic wind. A narrow rainband (20-40 km width), that a lifetime was quite short (1.5 hours), was also observed by the boundary layer radar (BLR) at another site. An outflow region with the tilted structure was present in the outer part (convective portion) of the rainband, and its bottom was not associated with strong cyclonic wind as seen in the wide rainband.

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“…In rainy conditions, the observation altitude of BLR increases up to 10 km (Teshiba et al 2001). Time and height resolutions are 60 s and 150 m. Reflectivity observed by BLR is also employed to investigate the vertical structure of precipitation systems.…”

Section: Upper Sounding Observationsmentioning

confidence: 99%

Evolution of a Super Cloud Cluster and the Associated Wind Fields Observed over the Indonesian Maritime Continent during the First CPEA Campaign

Shibagaki

Kozu

Shimomai

et al. 2006

Journal of the Meteorological Society of Japan

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A special tropospheric observation was conducted during 10 April-09 May 2004 as a part of the first campaign of the Coupling Processes in the Equatorial Atmosphere (CPEA-I), using upper soundings at seven stations in/around Sumatera, and weather radar and wind profilers at Kototabang (KT; 100.32 E, 0.20 S, 865 m above mean sea level), West Sumatera. A super cloud cluster (SCC) with a westerly wind burst (WWB) propagated eastward over the Indonesian Maritime Continent during 04-07 May. In the present report, we examine the evolution of that SCC and the associated wind behavior in detail, usingCorresponding author: Yoshiaki Shibagaki, Faculty of Information and Communication Engineering, Osaka Electro-Communication University, 18-8 Hatsu-cho, Neyagawa, Osaka 572-8530, Japan. E-mail: sibagaki@maelab.osakac.ac.jp ( 2006, Meteorological Society of Japan Geostationary Operational Environmental Satellite (GOES-9) Infrared (IR) data and CPEA observations. During the analysis period, the SCC developed over the eastern Indian Ocean, decayed rapidly as it reached Sumatera, and re-developed over Kalimantan. The eastward propagation of SCC resulted from the successive formation of meso-scale cloud clusters (CCs) with westward propagation. The transition of the SCC was related to the evolution of CCs. A CC generated over Sumatera began to diminish as the WWB arrives at a mountain range in western Sumatera, but it dominated in/around the mountain range for @9 hours. From upper sounding data aligned along the equator, it was found that the migration speed of the WWB over Sumatera was approximately half that over the sea region between Sumatera and Kalimantan, due to the orography of the Indonesian Maritime Continent. In western Sumatera, the peak height of the WWB at the mountain range ascended 1.5 km from that on the windward side. This shows that the eastward migration of the WWB was intercepted by the mountain range. The orographic influence on the WWB is considered to persist during the retention of the CC in its vicinity. Further, we reveal features of the orographic precipitation associated with the WWB and the detailed wind structure inside the SCC over the mountain range, from radar observations at KT.

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Typhoon 9707 observations with the MU radar and L-band boundary layer radar

Cited by 22 publications

References 12 publications

Secondary circulation within a tropical cyclone observed with L-band wind profilers

Secondary circulation within a tropical cyclone observed with L-band wind profilers

Meso-.ALPHA.-Scale Wind Field and Precipitating Clouds in Typhoon 9426 (Orchid) Observed by the MU Radar

Evolution of a Super Cloud Cluster and the Associated Wind Fields Observed over the Indonesian Maritime Continent during the First CPEA Campaign

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