ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 44 Issue 10 > 2018,44(10):1275-1285. DOI:10.7519/j.issn.1000-0526.2018.10.004 Prev Next
Convergence Characteristics of Severe Prefrontal Spiral Cloud Band of Typhoon Saola
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Abstract:
This paper analyses the convergence characteristics of explosive spiral cloud band of Typhoon Saola by using variety of observation data, wind decomposing, ShumanShapiro filtering and TREC (Tracking Radar Echoes by Correlation) wind inversion methods. The results indicate that spiral cloud band formed in the background of largescale convergence from the mesoscale filter wind, variation wind and divergent wind after decomposition. The lowlevel rotational wind was the major contributor to the horizontal kinetic energy input, which strengthened the lowlayer momentum accumulation. Besides, the divergent wind strengthened the convergence. The upper divergent wind was the major contributor to kinetic energy output, which strengthened the upper divergence. The rotational and divergent wind strengthened the vertical motion, promoting the development of severe spiral cloud band. After surface mesoscale filtering, we could see obvious mesoscale convergence or vortex in the two areas, which were also reflected in higher levels. Thus, the mesoscale convergence zone and spiral cloud band affect each other.
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