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1 期                 范   典等:一次稳定少动型西南涡演变的结构特征及其与暴雨的关系                                       175









































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                   图10 “2023·07·26”过程, 相邻2个时次平均的700 hPa以下层散度垂直积分(填色, 单位: hPa·s )、 风场(流线,
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                                             单位: m·s )和累计雨量(等值线, 单位: mm)
                  (a)26日00:00 -06:00, (b)26日06:00 -12:00, (c)26日12:00 -18:00, (d)26日18:00至27日00:00, (e)27日00:00 -06:00, (f)27日
                           06:00 -12:00, (g)27日12:00 -18:00, (h)27日18:00至28日00:00; 灰色阴影为地表气压低于700 hPa区域
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                  Fig. 10 The integral of divergence below 700 hPa (shading, unit: hPa·s ), wind field (streamline, unit: m·s ) on the
                    700 hPa and accumulated precipitation (contour, unit: mm) of the two adjacent times of the “2023·07·26” process.
                      (a) 00:00 -06:00 on 26, (b) 06:00 -12:00 on 26, (c) 12:00 -18:00 on 26, (d) 18:00 on 26 to 00:00 on 27,
                         (e) 00:00 -06:00 on 27, (f) 06:00 -12:00 on 27, (g) 12:00 -18:00 on 27, (h) from 18:00 on 27 to
                                   00:00 on 28. The gray shadow is the area of surface pressure below 700 hPa
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