设为首页
加入收藏
2007年夏季我国深对流活动时空分布特征
Distribution and Spatiotemporal Variations of Deep Convection over China and Its Vicinity During the Summer of 2007
-
摘要: 利用逐时FY-2C卫星红外亮温 (TBB) 资料讨论了2007年夏季 (6—8月) 我国深对流活动的时空演变特征，并同10年的深对流活动特征进行了对比分析。从TBB≤-52℃统计特征来看，2007年夏季我国大陆深对流活动主要集中在4个区域：华南沿海地区，青藏高原，云贵高原东部及四川、重庆，江淮流域。我国中东部地区深对流日际变化特征表明：不同月份深对流分布特征不同，深对流活动具有明显的间歇性、波动性特征。对比10年TBB≤-52℃统计结果来看，2007年夏季深对流日变化具有如下异常特征：华南地区深对流具有午后发展特征；青藏高原深对流活动持续时间明显短于10年统计结果，并且东传特征不明显；贵州东部、四川东北部山区、湖北西部山区、山东丘陵地带、江淮流域与华北平原深对流日变化表现出明显的多峰特征；江淮流域深对流日变化具有明显的向东传播特征。Abstract: The large-scale persisting rainstorm, extremely heavy precipitation and severe convective events result in tremendous damage in economy and severe personnel casualty during the summer of 2007. Based on FY-2C hourly infrared TBB dataset from June to August in 2007, the distribution and spatiotemporal variations of deep convection over China and its vicinity during the summer of 2007 is analyzed and compared with the atmospheric circulation background based on the NCEP final analysis dataset and the climatological distribution of deep convection based on 10-year TBB dataset. The statistical characteristics of TBB less than -52℃ show that there are four active deep convection areas over China during the summer of 2007: South China seaside, the Tibetan Plateau, the Yunan-Guizhou Plateau, Sichuan Province together with Chongqing City and the Yangtze-Huaihe River Basin. The daily variations of deep convection over Central and East China show that the deep convection distribution is very different in different months, and the deep convection activity has an obviously fluctuating feature. The active deep convection areas are farther south and are located to the south of 30°N in June, and the active deep convection areas advance to the north of 40°N in July, however, the active deep convection areas retreat to the south of 25°N in August. The characteristics of the daily variations of deep convection are close associated with the evolution of the large-scale atmospheric circulation. The deep convection over the Tibetan Plateau and the Yunnan-Guizhou Plateau has one active peak and lasts longer time in the diurnal variations, but the deep convection over the Sichuan Basin and Chongqing City has a nocturnal characteristic and develops in the early morning. Comparing with the 10-year statistical results of TBB less than -52 ℃, there are some characteristics different from the 10-year results. First, the deep convection over South China occurrs more frequently in the afternoon than those in the 10-year statistical results. Second, the lifetime of the deep convection over Tibetan Plateau is much shorter than the climatological lifetime. Third, there are multiple active periods of the deep convection in a day over East Guizhou Province, the Northeastern Mountains in Sichuan Province, the Western mountains in Hubei Province, the Hills in Shandong Procince, the Yangtze-Huaihe River Basin, and the Plain of North China. Finally, there is feature of the deep convection over the Yangtze-Huaihe River Basin that the deep convection obviously propagates eastward during the summer of 2007.
-
Key words:
- deep convection;
- IR TBB;
- spatial and temporal distribution
-
图 1 2007年6—8月平均环流特征
(a) 500 hPa高度 (单位:dagpm) 和850 hPa风矢量、风速 (阴影, 单位:m/s), (b) 200 hPa流场、风速 (阴影,单位:m/s) 和850 hPa θse (粗实线, 单位：K) (粗虚线表示梅雨锋锋区的南北界)
Fig. 1 Average atmospheric circulation for June—August 2007
(a) 500 hPa height (unit: dagpm) and 850 hPa wind vector and wind speed (shaded, unit： m/s); (b) 200 hPa stream field, wind speed (shaded, unit: m/s) and pseudo-equivalent potential temperature (thick solid lines, unit: K) (thick dashed lines denote the boundaries of the Meiyu front)
图 2 2007年6—8月TBB≤-52℃深对流活动频率分布 (单位: %)
Fig. 2 Deep convection frequency denoted by TBB≤-52℃ for June—August 2007 (unit: %)
图 3 2007年6—8月100°~120°E经度带平均深对流活动频率日际变化 (单位: %)
(a) 6月, (b) 7月, (c) 8月
Fig. 3 Daily variations of deep convection frequency averaged from 100° to 120°E (unit: %)
(a) June, (b) July, (c) August
图 4 2007年6-8月平均深对流活动频率日变化分布 (单位: %)
Fig. 4 Diurnal variations of deep convection frequency for June—August 2007 (unit: %)
图 5 2007年6—8月平均深对流活动频率时间-经向剖面图 (单位: %)
(a) 90°E, (h) 105°E, (c) 108°E, (d) 118°E
Fig. 5 Meridion-time cross sections of deep convection frequency for June—August 2007 (unit: %)
(a) 90°E, (b) 105°E, (c) 108°E, (d) 118°E
-
[1] 费增坪,郑永光,张焱, 等.基于静止卫星红外云图的MCS普查研究进展及标准修订.应用气象学报,2008,19(1):82-90. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20080113&flag=1 [2] 李玉兰,陶诗言,杜长萱.梅雨锋上中尺度对流云团的分析.应用气象学报,1993,4(3):278-285. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=19930350&flag=1 [3] 师春香,江吉喜,方宗义.1998长江大水期间对流云团活动特征研究.气候与环境研究,2000,5(3):279-286. http://www.cnki.com.cn/Article/CJFDTOTAL-QHYH200003006.htm [4] 王立琨,陶祖钰,杨阳, 等.1998年长江洪水大暴雨的卫星云图分析.北京大学学报(自然科学版),2000,36(1):87-94. http://www.cnki.com.cn/Article/CJFDTOTAL-BJDZ200001011.htm [5] 郑永光,陈炯,费增坪, 等.2003年淮河流域持续暴雨的云系特征及环境条件.北京大学学报(自然科学版),2007,43(2):157-165. http://www.cnki.com.cn/Article/CJFDTOTAL-BDXP200602002.htm [6] 巴德M J,福布斯G S,格兰特J R,等.卫星与雷达图象在天气预报中的应用.卢乃锰,冉茂农,刘健,等译.北京:科学出版社,1998: 298-300. [7] 郑永光,陈炯,陈明轩, 等.北京及周边地区5～8月红外云图亮温的统计学特征及其天气学意义.科学通报,2007,52(14): 1700-1706. http://www.cnki.com.cn/Article/CJFDTOTAL-KXTB200714019.htm [8] 郑永光,陈炯,朱佩君.中国及周边地区夏季中尺度对流系统分布及其日变化特征.科学通报,2008,53(4): 471-481. http://www.cnki.com.cn/Article/CJFDTOTAL-KXTB200804017.htm [9] 郑永光,王洪庆,陶祖钰, 等.Windows下二维气象绘图软件——客观分析诊断图形系统.气象,2002,28(3): 42-45. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXX200203009.htm [10] 郑永光,陈炯,王洪庆, 等.一个气象数据分析绘图软件的设计与开发.应用气象学报,2004,15(4): 506-509. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20040462&flag=1 [11] 郑永光,朱佩君,白洁, 等.Windows下静止卫星云图处理软件.气象,2003,29(6): 16-21. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXX200306004.htm [12] 郑永光,陈炯,朱佩君.改进的静止卫星云图软件处理系统.气象,2007,33(12): 103-109. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXX200712017.htm [13] Maddox R A. Mesoscale convective complexes. Bull Amer Meteor Soc,1980,61(11): 1374-1387. doi: 10.1175/1520-0477(1980)061<1374:MCC>2.0.CO;2 [14] Augustine J A, Howard K W. Mesoscale convective complexes over the United States during 1986 and 1987. Mon Wea Rev,1991,119(7): 1575-1589. doi: 10.1175/1520-0493(1991)119<1575:MCCOTU>2.0.CO;2 [15] Jirak I L,Cotton W R,Mcanelly R L. Satellite and radar survey of mesoscale convective system development. Mon Wea Rev,2003,131(10): 2428-2449. doi: 10.1175/1520-0493(2003)131<2428:SARSOM>2.0.CO;2 [16] Wallace J M. Diurnal variations in precipitation and thunderstorm frequency over the conterminous United States. Mon Wea Rev,1975,103(55): 406-419. doi: 10.1175/1520-0493%281975%29103<0406%3ADVIPAT>2.0.CO%3B2 [17] Carbone R E, Tuttle J D, Ahijevych D A ,et al. Inferences of predictability associated with warm season precipitation episodes. J Atmos Sci,2002,59(13): 2033-2056. doi: 10.1175/1520-0469(2002)059<2033:IOPAWW>2.0.CO;2 [18] Wang C C, Chen G T J, Carbone R E. A climatology of warm season cloud patterns over East Asia based on GMS infrared brightness temperature observations. Mon Wea Rev,2004,132(7): 1606-1629. doi: 10.1175/1520-0493(2004)132<1606:ACOWCP>2.0.CO;2 [19] 贺新强,陈受钧,郑永光.东亚夏季对流云顶黑体辐射温度的频率分布及其日变化.热带气象学报,2003,19(1): 53-60. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX200301006.htm [20] 张顺利,陶诗言,张庆云,卫捷.长江中下游致洪暴雨的多尺度条件.科学通报,2002,47(6): 467-473. http://www.cnki.com.cn/Article/CJFDTOTAL-KXTB200206020.htm [21] 张庆云,陶诗言,张顺利.夏季长江流域暴雨洪涝灾害的天气气候条件.大气科学,2003,27(6): 1018-1030. http://www.cnki.com.cn/Article/CJFDTOTAL-DQXK200306005.htm -
下载:
计量
- 摘要浏览量: 4641
- HTML全文浏览量: 803
- PDF下载量: 1539
- 被引次数: 0
