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Analysis on the frontogenesis mechanism of an extreme rainstorm in Shandong Province caused by Typhoon “Rumbia”
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图7 2018年8月19日08:00(a)、20:00(b)700 hPa 螺旋度和19日08:00(c)、20:00(d)及20日02:00(e)、08:00(f)螺旋度沿36.5°N的经度-高度剖面(单位:10-7 hPa·s-2
Fig.7 The 700 hPa helicity (Unit: 10-7 hPa·s-2) at 08:00 (a), 20:00 (b) on 19, the longitude-height profile of helicity along 36.5°N at 08:00 (c), 20:00(d) on 19 and 02:00 (e), 08:00 (f) on 20, August 2018(Unit: 10-7 hPa·s-2