26 1 2008 3 : 1006-7639 (2008) - 01-0001 - 07 AR ID METEOROLOGY Vol. 26 No. 1 March, 2008 2006, (, 211101) : NCEP OLR SST 2006, :, : ; ; ; ; : P458. 1 + 1 : A,,, [ 1 ] [ 2-5 ],, ( 400 m ),,, [ 6 ], 2006, 1 (NCEP) 2006 5 8 26, 4, 1 1 ; 1957 1996 40 a, 2. 5 2. 5, 1 1 ; (OLR ) ( SST) (NOAA), OLR 1974 6 2007 3, 2. 5 2. 5, 1980 1999 ; SST 1854 1 2007 4 2 2, 1957 1996 40 a 2 2006 7 7 11, 10 15 d; 9 4 5,, 2,, 2. 1, 2 : ; 6 4 9 10, 35 52 d, 40 13 d, 1971 25 d 1995 2 d 7 8 30. 3 32, 40 a 3. 1 4. 6 8 16, 44. 5, 53 a, 7 8 (0 cm ) : 2007-11 - 19; : 2008-01 - 21 : (1983 - ),,,,. E - mail: wangqiuliangyjs@163. com
2 26 40 2. 2, 2 : ; 4 8, 401. 2 mm, 707. 7 mm, 43. 3% ; 350 mm, 70% 7 19 8 19, 32 d, 1992 24 d 4 8 1 022 mm, 45. 1% 7 8 570 mm, 1994 490 mm, 850 hpa ( ), 6, 7, 8 3 3. 1 14 ( T max ), 105 108 E, 28 32 N, T max 35 1 6 8 6 10 T max 35, 17 4 d 35, 23 28 35 7 1 7 8 23 T max < 35, 7 15 20 21 28 40 8 5 6 20 21 22 23 35, 8 11 12 14 15 16 31 40, 8 15 43. 5 7 8, > 35 52 d, 40 10 d 1 6 8 Fig. 1 The daily change of maximum surface temperature 3. 2 in Chongqing from June to August 2 7 8 106 E, ( 30 N ), ( ), (850 hpa ), 3 4, 2 2006 7 ( a) 8 ( b) 106 E ( : K) ( : 7 8 ; : 40 a ) Fig. 2 Vertical cross - section of temperature along 106 E of July( a) and August ( b) ( Solid lines for monthly mean isotherm s in July or August, dashed lines for mean climatic isotherm s from 1957 to 1996)
1 : 2006 3, 500 hpa 1 2, 500 hpa 4, 2006 4. 1,, [ 7-9 ] 4. 1. 1 3 2006 7 500 hpa,,, 7 2,, 2006 7 2, ( 3a ),,, 2, 28 N 40 N 110 E, 2006 2 1,,, 3 2006 7 500 hpa ( ) ( ) ( a) 500 hpa ( b) Fig. 3 The 500 hpa potential height field and departure of July in 2006 ( a) and during 1957-1996 ( b) ( Solid lines for potential height, shaded for the departure) 8,,,, 5 870 gpm 2006 5 7 8, 6 [ 10 ] : 500 hpa,, 2006 500 hpa,, 5 880 gpm, 6 ( 4a) 7 ( 4b) 6 120 E, 16, 7, 124 E, 11,, 160 E 3 4, 160 E,,, 5 6 2006
4 26 4 6 ( a) 7 ( b) 500 hpa ( 2006, ) Fig. 4 Characteristic lines of Subtrop ical H igh of 500 hpa in June ( a) and July( b) ( Solid line for the year of 2006, dashed line for mean climatic state) (OLR ) [ 11 ], OLR [ 12 ] OLR 5 2006 8 OLR, 3a,, OLR, OLR OLR > 20 W m - 2, 500 hpa ( ), 7,,, 2006 7 2,, ; ( ) : 5, 33 50 N 85 E, 2006, 78 E ; 6, 105 E 40 a 28 N, 2006 22 N, 20 30 N 97 107 E ; 7 100 E,, 40 a, 30 N ; 8 100 E, 1 4. 1. 2,,, [ 13 ] [ 13 ] : (W estern Pacific W arm Pool, W PW P), 5 2006 8 OLR ( ) ( ) Fig. 5 Monthly mean field of OLR in August and the departure of OLR ( Solid lines for monthly mean field, shaded for the departure) 6 5 SST Fig. 6 D istribution of positive departure of SST in May of 2006
1 : 2006 5, [ 14-17 ] SST ( Sea Surface Temperature) : 5 8 ( 6),, 5 6 120 180 E 10 20 N : 5 0. 379, 6 0. 436, 7 0. 168, 8 0. 0617,,,, 4. 2, [ 18 ] ( ) [ 19 ] : 7 2006 7 500 hpa 7,, 2006, 5 600 gpm, 5 2006, 7 180 E ;, 2006,, 7 2006 7 500 hpa ( a) ( b) Fig. 7 Monthly mean potential height field of 500 hpa in July of 2006 ( a) and during 1957-1996 ( b) 4. 3 [ 13 ] :,,, 200 hpa,, [ 20 ] 2006 5 8, 200 hpa, 7 ( 8), 90 E 31 N, 83 E 29 N, 2006 7, 2, 5 8 200 hpa 6 5 10, 1 3 100 hpa ( ), 5 8 5 100 hpa 100 E, 2006 5 70 100 hpa 200 hpa, [ 13 ] 30 m / s 2006 5 8,,,, 9 8,, 2006 40 N, 50 N, 132 E; 38. 5 N, 46 N, 103 E,, 2006,, 2 m / s
6 26 4. 4, 2006,,,,,, 2006,,,, 2006,,,,,,,,, [ 21 ] 5 (1) 2006,, 500 hpa (2) OLR, 2006,,
1 : 2006 7 (3) 500 hpa : [ 1 ],,,. 40 [ J ]., 2006, 25 (4) : 633-642. [ 2 ],,,. ( ) [ C ]. :, 2000. [ 3 ]. [ J ]., 1988, 2 (1) : 25-26. [ 4 ],. [ J ]., 1997, 16 (2) : 153-164. [ 5 ]. [ J ]., 1999, 18 (3) : 321-332. [ 6 ]. [M ]. :, 1991. 7-10. [ 7 ],,. 2003 [ J ]., 2005, 21 (4) : 393-402. [ 8 ],,,. [ J ]., 2005, 21 (5) : 488-497. [ 9 ],,,. [ J ]., 2005, 28 (5) : 578-585. [ 10 ],. [M ]. :, l979. 202-231. [ 11 ],. 2003 OLR [ J ]., 2005, 31 (7) : 10-15. [ 12 ],,. OLR [ J ]., 2001, 12 (3) : 378-382. [ 13 ],. [ J ]., 2000, 58 (4) : 500-512. [ 14 ],. [ J ]. ( ), 1988, 107-116. [ 15 ],. [ J ]., 1992, 16 (1) : 52-61. [ 16 ],. [ J ]., 1994, 18 ( 2) : 141-151. [ 17 ],. [ J ]., 1993, 15 (1) : 31-43. [ 18 ],. [ J ]., 2006, 26 (2) : 135-142. [ 19 ],,. 2003 [ J ]., 2005, 25 (5) : 528-533. [ 20 ],,. [ J ]., 2006, 24 (3) : 69-74. [ 21 ]. [ J ]., 1990, 14 (1) : 108-117. C ircula tion Character istics of H igh Tem pera ture and D rought in Summ er of 2006 in Chongq ing WANG Q iuliang, ZHANG L ifeng ( Institute of M eteorology, PLA U niversity of Science and Technology, N anjing 211101, China) Abstract: The weather characteristics, circulation background and the formation mechanism of the abnormal lasting high temperature and drought event occurred in Chongqing in summer of 2006 are analyzed by using reanalysis data of NCEP, OLR and SST data. Re2 sults show that the abnorm ity ofw est Pacific Subtrop ical H igh resulted in this lasting high temperature and drought event, and this ab2 norm ity of W est Pacific Subtrop ical H igh was greatly affected by such factors as the abnormal position and strength of Southern A sia H igh, changes of Polar vortex and subtrop ical jet stream, warm ing W est Pacific W arm Pool and so on. Key words: Chongqing; summer high temperature and drought; weather characteristics; circulation background; formation mechanism