西北东部半干旱区一次极端特大暴雨的触发和维持机制
沙宏娥1(), 傅朝1(), 刘维成1, 徐丽丽1, 刘娜1, 刘新雨2, 马绎皓1
Mechanism of trigger and maintenance during an extremely torrential rain in semi-arid region of eastern Northwest China
SHA Honge1(), FU Zhao1(), LIU Weicheng1, XU Lili1, LIU Na1, LIU Xinyu2, MA Yihao1

图11. 2022年7月15日06:00 700 hPa(a)和500 hPa(b)涡度(填色,单位:10-4 s-1)及风场(矢量,单位:m·s-1)、850 hPa散度(填色,单位:10-4 s-1)及风场(矢量,单位:m·s-1)(c)和15日04:00地面风场(矢量,单位:m·s-1)及地形高度(填色区,单位:m)(d)以及沿107.5°E(e)与沿36.5°N(f)的散度(填色,单位:10-4s-1)及垂直速度(等值线,单位:Pa·s-1)垂直剖面
(棕色箭头为低空急流,红色矩形区为低空急流入口区右侧和出口区右侧负涡度平流区,黑色线包围区域为庆阳市)

Fig.11. The 700 hPa (a) and 500 hPa (b) vorticity (the color shaded, Unit: 10-4 s-1) and wind field (vectors, Unit: m·s-1) and the divergence (the color shaded, Unit: 10-4 s-1) and wind field (vectors, Unit: m·s-1) at 850 hPa (c) at 06:00 BST July 15,2022, the surface wind field (vectors, Unit: m·s-1) and terrain height (the color shaded, Unit: m) at 04:00 BST July 15, 2022 (d), the zonal vertical section along 107.5°E (e) and the meridional vertical section along 36.5°N (f) of divergence(the color shaded, Unit: 10-4 s-1) and vertical velocity (isolines, Unit: Pa·s-1
(The brown arrow line is low-level jet, and the red rectangular regions are negative vorticity advection areas on the right side of the entrance and the exit of low-level jet,and the area enclosed by black line is Qingyang)