408 30,, [ 225 ],,,,, [ 629 ],, , 2008,,,,, mm, mm, 3115 mm /h, (34193 N, E), mm, 8511 mm /h,, :,, (5 1

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1 30 3 Vol. 30, No SC IENTIA METEOROLOGICA SIN ICA Jun., 2010,,,.., 2010, 30 ( 3) : Zhang J ingying, Chen J inm in, L iu Yingjie, et al. Analysis of mechanism s of short2time rainfall in the p rocess of strong rainfall. Scientia Meteorologica Sini2 ca, 2010, 30 ( 3) : , (1, ) (2, ) (3, ), 2008 :, :, ;,,, P B Analysis of mechan ism s of short2time ra infall in the process of strong ra infall Zhang J ingy ing 1, 2 Chen J inm in 3 L iu Y ingjie 1 L iu Yaru i 1 Pan L ing 1 ( 1 L inyi M eteorologlical B ureau, Shandong L inyi , China) ( 2 Shandong M eteorological Institude, J inan , China) ( 3 Shandong M eteorological O bservatory, J inan , China) Abstract By using radar radial velocity, storm relative radial velocity and wind velocity p rofile as well as numerical p rediction p roducts and information on rainfall, mechanism s of short2time rainfall in the p rocess of the biggest and the last strong rainfall in 2008 in L inyi are analyzed. it is found that the ap2 pearance of sm all and m edium 2scale system is causes of short2tim e heavy rainfall under the favorable situ2 ation of the large circulation. The analysis also showed that the maintenance of stable low2level jet is use2 ful to continuing the p rocess of p recip itation, and the p recip itation intensity changes are caused by high2 level jet volatility, and the m iddle2level troposphere southwest jet is established and strengthened when the upper air current is combined w ith the low2level current, and medium 2scale system generated, and then short2term strong rainfall is p roduced. Key words Strong rainfall W ind velocity p rofile Analysis of mechanism ( ), 25 mm /h 1 h [ 1 ] : ; : : (2008 sdqxz 20) ( ) : (19672),,,,. zhjingying@126. com

2 408 30,, [ 225 ],,,,, [ 629 ],, , 2008,,,,, mm, mm, 3115 mm /h, (34193 N, E), mm, 8511 mm /h,, :,, (5 15 ) (, ),, ; (17 21 ),,,, , 500 hpa ( ),, 115 E,,, ; 21 08, 500 hpa ( ), ( : mm) Fig. 1 Real hourly p recip itation ( unit: mm) on August 21, 2008,, 588 ;, 700 hpa ( ), 20 m / s; 850 hpa ( ),,, 12 m / s, 20,, 8 14 :,, 21 20, 500 hpa ( 2a),,, ; 850 hpa ( 2b),,, 21 20,,, : 21 19, 500 hpa ( ), ; 850 hpa ( 3a),, ( 3b) ( 3c), 14,, 20,

3, : 409 2 2008 8 21 20 ( a) 500 hpa; ( b) 850 hpa Fig.

c) 20 Fig. 3 ( a) Simulated 850 hpa wind field at 19: 00; ( b, c) data analysis of automatic weather station at Shandong on Aug.

3 3, : ( a) 500 hpa; ( b) 850 hpa Fig. 2 The situation analysis of ( a) 500 hpa; ( b) 850 hpa at at Shandong on Aug121, ( a) hpa ; ( b, c) ( ), ( b) 14 ; ( c) 20 Fig. 3 ( a) Simulated 850 hpa wind field at 19: 00; ( b, c) data analysis of automatic weather station at Shandong on Aug. 21, 2008; ( b) at 14: 00; ( c) at 20: 00,,,, ( ) :,,, ,,,,, ;,,,, 2. 1 (34193 N, E) 4a, N hpa, 950 hpa 500 hpa, s - 1, N 600 hpa, hpa, ( ), N,,, 500 hpa 20 m / s,, 500 hpa 300 hpa, 214 m / s,, [ 10 ]

410 30 4 ( a) 21 18 (,, 10-4 s - 1 ) ; ( b) 21 18 700 hpa ( : m / s) Fig.

on August 21,, 4 ( b) 21 18 700 hpa, 700 hpa 22 m / s, ( ) ( ) : 21 16 20, 20 12 m / s,,, 21 14, 12 m / s 700 hpa, 17 12 m / s, 20,, 17 400 hpa 20 m / s, :,, 2.

4 ( a) (,, 10-4 s - 1 ) ; ( b) hpa ( : m / s) Fig. 4 ( a) The radial p rofile of vor ( solid line) and div ( dotted line) ( unit: 10-4 s - 1 ) ( b) 700 hpa wind and total speed evolution ( unit: m / s) on L inyi at on August 21,, 4 ( b) hpa, 700 hpa 22 m / s, ( ) ( ) : , m / s,,, 21 14, 12 m / s 700 hpa, m / s, 20,, hpa 20 m / s, :,, 2. 2, R w q [ 1 ], w, q 4, ( 5a) : 4,, , 08 19, hpa 5 ( a) ( : g/kg) T - T d ( : ) ( b) ( : 10-2 g m kg - 1 s - 1 ) Fig. 5 The evolution of specific hum idity( a, solid line, unit: g/kg), T - T d ( a, dotted line, unit: C) and wq ( b, unit: 10-2 g m kg - 1 s - 1 )

5 3, : 411,,,, 14, 300 hpa, hpa, 18 g/kg, 2 g/kg,, ( ) ( 5b), 21 17,, g m kg - 1 s - 1, 600 hpa,,, ,,, ;,, ( 1),,, 3. 1 ( ),,,, 40 dbz, 5 6 km, km /h,, ( ),,, dbz, 6 8 km, 40 km /h ,,, - 29 m / s, ; 16 24,,,,, 30 m / s,, ; 17 45,,, S,,,, 18 34,,,, 19 ;, 7, 214,, (34193 N, E),, ( 8511 mm /h) ( 6 ),,,,, ; 17 20,,,,,, 17 20, 30 m / s,,,, S, ; 17 45,, S,,,, ; 18 34,,, 30 m / s, 19,,, ;,,,,, :,,,,,, ,

412 30 6 2008 8 21 16 19 ( ) ( ) ( 015, 230 km) Fig.

19 00 on August 21, 2008 7 2008 8 21 18 34 ( ) Fig.

6 ( ) ( ) ( 015, 230 km) Fig. 6 The evolution of radar V ( upper) and RV ( lower) ( elevation 015, the max range: 230 km from to on August 21, ( ) Fig. 7 Radial velocity of differint elevations at 18: 34 on August 21, 2008 [ ],,,, :, h (, ),, ( ), 016 km, 4 h, km 20 m / s, (14 17 ),,,,,, (11 14, ),,,, :,,,,,,,,,,, 4 (1) ,,

7 3, : h (, ) Fig. 8 Radar p rofile on August 21 at a half2hour interval( curve refers to high2level wind fluctuations, thin solid line for the p recip itation reduced and thick solid line for p recipitation2strengthened timeinterval), (2),,,,,,,, (3),,,,, (4),,,,,,,,, [ 1 ],,,.. :, 2005: [ 2 ],.., 2004, 62 (5) : [ 3 ],,,.., 2007, 27 (1) : [ 4 ],,.. :, 2003: [ 5 ],,.., 2006, 29 (4) : [ 6 ],,. 9 4., 2006, 26 (5) : [ 7 ],,.., 2007, 30 (3) : [ 8 ],,,.., 2006, 26 (4) : [ 9 ],,,.., 2007, 30 (1) : [ 10 ].. :, 2004: 283. [ 11 ],,.., 2003, 19 (3) : [ 12 ],,.., 2005, 12:

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