QX气象Meteorological Monthly1000-0526气象编辑部中国北京qx-41-10-121510.7519/j.issn.1000-052P458研究论文Articles2013年6月7日浙江省中北部暴雨过程诊断分析Diagnostic Analysis on the Torrential Rain Process over the Middle and Northern Parts of Zhejiang Province on 7 June 2013李进LIJin
The torrential rainfall in the middle and northern parts of Zhejiang Province on 7 June 2013 was diagnosed based on the latest ECMWF ERA-Interim global reanalysis data with 0.75°×0.75° resolution. The results show that the torrential rain was caused by two developing eastward-moving systems-an upper-level shortwave trough and a low-level southwest vortex, and the torrential rainfall area over the middle and northern of Zhejiang are located in the coupling area of the upper-level and low-level jet streams. A large amount of instability energy was stored below 700 hPa before the occurrence of rainstorm, which was triggered by the southwest vortex close to the torrential rainfall area. The analysis of environmental fields by means of physical decomposition of atmospheric variables shows that background ambient was in favor of this regional rainstorm, causing the instantaneous anomaly field to trigger the torrential rainfall at last. The torrential rainfall is obviously located in the anomalous warm convergence shear line at 850 hPa.
The distribution of temperature, water vapor flux and original wind fields on (a) 250 hPa, (b) 700 hPa and (c) 925 hPa at 02:00 BT 7 June 2013
-1·kg-1),曲箭头为风场,白色实线为低涡的冷暖切变,白色断线表示水汽通量辐合区,白色箭头表示水汽通量大值中心输送方向,浙江北部的实心圆点表示日降水量≥50 mm站点,空心圆点表示25 mm≤降水量≤50 mm站点]]]>-1·kg-1) and curly vectors are winds.
White solid lines indicate the cold-warm front shear, white dashed line indicates the convergence region of water vapor flux,
white arrow indicates the transport direction of maximum values of water vapor flux, solid dots in northern Zhejiang indicate
stations with daily precipitation more than 50 mm, and hollow dots indicate the daily precipitation is
more than or equal to 25 mm, but less than 50 mm]]]>能量场分析
The vertical profile of pseudo-equivalent temperature and vertical speed along 120°E (a) at 20:00 BT 6 June and (b) at 08:00 BT 7 June 2013, respectively
θse (单位: K),填充区域为垂直速度(单位: m·s-1),
其中负值区为灰度小圆点填充区,正值为灰度填充区]]]>θse (unit: K), shaded areas are vertical speed (unit: m·s-1), in which the shaded area with gray dots indicate negative value, and the gray shaded area is positive]]]>大气变量物理分解场分析
The distribution of instantaneous anomalous temperature, water vapor flux and winds around Zhejiang at 250 hPa (a), 500 hPa (b), 850 hPa (c) and 925 hPa (d) at 08:00 BT 7 June 2013, respectively
图 2)]]>Fig. 5a is for the upper-level anomalous divergence area, the thin arrows indicate the divergence windstrens and in Fig. 5b for the positive anomalous vorticity region. In Figs. 5c and 5d, white solid lines represent the convergence lines of anomalous winds, dashed line indicates the convergence area of water vapor flux anomaly, and thick arrows indicate the advection direction of cold-warm temperature anomaly. The solid and hollow dots in northern Zhejiang are same as in Fig. 2)]]>结 论
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