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We use global reanalysis data probided by NCEP/NCAR, precipitation data at 740 observational stations of China provided by the National Climate Center of the China Meteorological Administration, and grid data of precipitation in 2011 provided by National Meteorological Information Center to analyze the phenomenon of a sharp turn from drought to flood in the middle and lower reacher of Yangtze River in early June 2011, and the characteristics of its circulation background and briefly conclude as follows: 1) the precipitation in the middle and lower reaches of the Yangtze River was less and its change rate was smaller than that of corresponding climatological normals from January to May in 2011, both surged suddenly in June, leading to the appearence of a sharp turn from drought to flood in June, and the kickpoint was at the 31st pentad (the 1st pentad in June); 2) around the sharp turn, both flood water vapor flux and the space-time evolution characteristics of the first and the second modes of EOF analysis represented the transform of water vapor transport from a weaker state to a stronger one; 3) before and after the turn, atmospheric circulation fields were significantly different. Before the sharp turn, winter monsoon in northern hemisphere was strong, and summer monsoon in southern hemisphere was weak, leading to the delay of monsoon tranform, stronger East Asian Trough, which went against warm-moist air blowing to the north. All of that eventually led to less rainfall in south China and occurance of this sharp turn. In early June, the period of turining, the circulation was adjusted quickly, which presented that the western Pacific subtropical high extended to west and jump to north abruptly, East Asian Trough kept strong and was maintained in the west, and blocking high located in the Okhotsk Sea weakened. Thus, cold and warm air converged in the middle and lower reaches of the Yangtze River and contributed to the occurance and continuation of precipitation. It is the main reason of the sharp turn from drought to flood in the middle and lower reaches of the Yangtze River.
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[21] Shi N, Yi Y M, Gu J Q, Xia D D 2006 Chin. Phys. 15 2180
[22] Wu Z W, Li J P, He J H 2006 Geophys. Res. Lett. 33 L05813 doi: 10. 1029/2005GL024487
[23] Kalnay E, Kanamitsu M, Kistler R, Collins W, Deaven D, Gandin L, Iredell M, Saha S, White G, Woollen J, Zhu Y, Chelliah M, Ebisuzaki W, Higgins W, Janowiak J, Mo K C, Ropelewski C, Wang J, Leetmaa A, Reynolds R, Jenne R, Joseph D 1996 Bull. Amer. Meteor. Soc. 77 437
[24] Ding Y H 2005 Advanced Weather (Beijing: Meteorologica Press) pp1-585 (in Chinese) [丁一汇 2005 高等天气学 (北京:气象出版社) 第1-585页]
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[26] Feng G L, Dai X G, Wang A H, Chou J F 2001 Acta Phys. Sin. 50 606 (in Chinese) [封国林, 戴新刚, 王爱慧, 丑纪范 2002 50 606]
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[28] Li J P, Chou J F 2003 Chin. Atmos. Sci. 27 653 (in Chinese) [李建平, 丑纪范 2003 大气科学 27 653]
[29] Dai X G, Fu C B, Wang P 2005 Chin. Phys. 14 850
[30] Wang P, Dai X G 2004 Chin. Phys. 13 1770
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[1] Wu Z W, Li J P, He J H, Jiang Z H 2006 Chin. Sci. Bull. 51 1717 (in Chinese) [吴志伟, 李建平, 何金海, 江志红 2006 科学通报 51 1717]
[2] Dai A, Trenberth K E, Karl T R 1998 Geophys. Res. Lett. 25 3367
[3] Tu C W, Huang S S 1994 Acta Meteorol. Sin. 18 1 (in Chinese) [涂长望, 黄士松 1994 气象学报 18 1]
[4] Tao S Y 1980 Rain Storm in China (Beijing: Science Press) p1-p225 (in Chinese) [陶诗言著 1980 中国之暴雨 (北京:科学出版社) 第1页-第225页]
[5] Tao S Y, Li J S, Wang A S 1997 Nat. Disaster Reduction in China 7 17 (in Chinese) [陶诗言, 李吉顺, 王昂生 1997 中国减灾 7 17]
[6] Lin X C, Xu S Y 1989 Geogr. Res. 8 44 (in Chinese) [林贤超, 徐淑英 1989 地理研究 8 44]
[7] Ding Y H 1992 Meteor. Soc. Japan 70 373
[8] Shi N, Zhu Q G 1993 Adv. Atmos. Sci. 10 155
[9] Shi N, Zhu Q G, Wu B G 1996 Atmos. Sci. 20 575 (in Chinese) [施能, 朱乾根, 吴彬贵 1996 大气科学 20 575]
[10] Dai X G, Wang P, Chou J F 2003 Chin. Sci. Bull. 48 23 (in Chinese) [戴新刚, 汪萍, 丑纪范 2003 科学通报 48 23]
[11] Dai X G, Chou J F, Wu G X 2002 Acta Meteorol. Sin. 60 544 (in Chinese) [戴新刚, 丑纪范, 吴国雄 2002 气象学报 60 544]
[12] Chen H Y 1957 Acta Meteorol. Sin. 1 28 (in Chinese) [陈汉耀 1957 气象学报 1 28]
[13] Tao S Y, Xu S Y 1962 Acta Meteorol. Sin. 32 1 (in Chinese) [陶诗言, 徐淑英 1962 气象学报 32 1]
[14] Zhang Q Y, Tao S Y 1998 Acta Meteorol. Sin. 56 2 (in Chinese) [张庆云, 陶诗言 1998 气象学报 56 2]
[15] Nan S L, Li J P 2003 Geophys. Res. Lett. 30 24
[16] Huang R H 1990 Atmos. Sci. 14 234 (in Chinese) [黄荣辉 1990 大气科学 14 234]
[17] Wu G X, Liu H Z 1995 Atmos. Sci. 19 422 (in Chinese) [吴国雄, 刘还珠 1995 大气科学 19 422]
[18] Zhang Q, Liu P, Wu G X 2003 Atmos. Sci. 27 922 (in Chinese) [张琼, 刘平, 吴国雄 2003 大气科学 27 922]
[19] Li Y, Wang Y F, Wei D 2007 Acta Meteorol. Sin. 65 393 (in Chinese) [李琰, 王亚非, 魏东 2007 气象学报 65 393]
[20] Shi N, Gu J Q, Yi Y M, Lin Z M 2005 Chin. Phys. 14 844
[21] Shi N, Yi Y M, Gu J Q, Xia D D 2006 Chin. Phys. 15 2180
[22] Wu Z W, Li J P, He J H 2006 Geophys. Res. Lett. 33 L05813 doi: 10. 1029/2005GL024487
[23] Kalnay E, Kanamitsu M, Kistler R, Collins W, Deaven D, Gandin L, Iredell M, Saha S, White G, Woollen J, Zhu Y, Chelliah M, Ebisuzaki W, Higgins W, Janowiak J, Mo K C, Ropelewski C, Wang J, Leetmaa A, Reynolds R, Jenne R, Joseph D 1996 Bull. Amer. Meteor. Soc. 77 437
[24] Ding Y H 2005 Advanced Weather (Beijing: Meteorologica Press) pp1-585 (in Chinese) [丁一汇 2005 高等天气学 (北京:气象出版社) 第1-585页]
[25] Feng G L, Hou W, Dong W J 2006 Acta Phys. Sin. 55 2 (in Chinese) [封国林, 侯威, 董文杰 2006 55 962]
[26] Feng G L, Dai X G, Wang A H, Chou J F 2001 Acta Phys. Sin. 50 606 (in Chinese) [封国林, 戴新刚, 王爱慧, 丑纪范 2002 50 606]
[27] Gong Z Q, Feng G L, Wan S Q, Li J P 2006 Acta Phys. Sin. 55 477 (in Chinese) [龚志强, 封国林, 万仕全, 李建平 2006 55 477]
[28] Li J P, Chou J F 2003 Chin. Atmos. Sci. 27 653 (in Chinese) [李建平, 丑纪范 2003 大气科学 27 653]
[29] Dai X G, Fu C B, Wang P 2005 Chin. Phys. 14 850
[30] Wang P, Dai X G 2004 Chin. Phys. 13 1770
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