ANALYSIS OF INDICES FOR SEVERE CONVECTIVE WEATHER UNDER THE INFLUENCE OF TROPICAL CYCLONES IN JIANGSU     

杨程  宋金杰  王元  曾明剑 《热带气象学报(英文版)》2014,20(4):368-375

By statistical research on the occurrence pattern of severe convective weather in Jiangsu province under the influence of tropical cyclones within a 10-year period (from 2001 to 2010), this paper discovers that among different severe convective weather, the occurrence frequency of short-range heavy precipitation is the highest, thunderstorms and gales come in second, and general thunderstorms rarely happen, while hailstorms and tornadoes never occur. The statistical results also showed that within the research period there are 21 tropical cyclones (TCs) affecting the Jiangsu area and most of them are in the stage of weakening to tropical depressions. Moreover, through studying indices for relevant cases of severe convection, it is discovered that their thresholds are lower than that of previous research, which indicated that convective instability and energy accumulation can easily lead to severe convective weather eventually due to the influence of TCs.  相似文献   

2012年中国沿海海平面上升显著成因分析   总被引：3，自引：0，他引：3  

王慧  刘克修  范文静  高志刚  张建立  李琰  张增建 《海洋学报》2014,36(5):8-17

2012年,中国沿海海平面变化最突出的特点是海平面升高显著。海平面总体比常年高122mm,较2011年偏高53mm,达1980年以来最高位。本文使用中国沿海及西北太平洋区域近30a的水位、海温、气温、气压和风等水文气象资料,详细分析了中国沿海海平面2012年异常偏高的成因。结果表明:2010-2012年中国沿海海平面处于2~3a、8~9a和准19a周期震荡的高位,几个周期震荡高位叠加,对海平面上升起了明显的影响;2012年,沿海气温和海温分别较常年偏高0.4℃和0.3℃,气压较常年低1.2hPa,气压达历史最低位;2012年,中国南海夏季风爆发时间较常年偏早,结束较常年偏晚,季风持续时间较常年偏长,导致2012年5-6月和8月,在黄海和东海海域,东北风持续偏强,南海海域南风偏强,风场的异常导致黄海、东海和南海沿海海水长时间堆积,是造成海平面升高的原因之一;2012年,热带气旋登陆时间集中,影响范围广,北上和影响东北地区的台风数量均为历史之最,特别是2012年8月,有6个热带气旋相继影响我国沿海,对当月海平面升高影响明显;另外,2012年副热带高压偏北、偏东、偏弱的特点对东海和南海的海平面上升也有一定影响。  相似文献   

ASYMMETRICAL STRUCTURES OF THE TEMPERATURE AND HUMIDITY OF TROPICAL CYCLONES   总被引：1，自引：0，他引：1  

杨涛  雷小途  汤杰 《热带气象学报(英文版)》2016,22(3):296-304

Based on NCEP/CFSR 0.5° reanalysis data and the best track data from the Japan Tokyo Typhoon Center,composite and comparative analyses demonstrate the asymmetrical structures of the temperature and humidity in tropical cyclones over the Western North Pacific and the South China Sea from 1979 to 2010.The results are shown as follows.(1) With intensifying tropical cyclones,the flow field tends to become gradually more axisymmetric;however,the asymmetry of the specific humidity in the outer regions is more obvious.(2) In general,tropical cyclones have a non-uniform,vertical, "double warm-core" structure.The "warm-cores" in the lower level of weak tropical cyclones and in the higher level of strong tropical cyclones are the stronger of the two.(3) The distribution area of a "warm-core" is enhanced with cyclone intensification and tends to become more axisymmetric.At 200 hPa,the "warm-core" of a weak cyclone has a weak anticyclone in the center,whereas that of a strong cyclone has a weak cyclone in the center.(4)The "wet-core" of a tropical cyclone is primarily located in the lower level(700-850 hPa).With the cyclone's intensification,the intensity of the "wet-core" increases and the scope of the 0.8 g kg~(-1) specific humidity anomaly tends to expand to higher levels.(5) With the cyclone's deepening,the pseudo-equivalent potential temperature at different levels in different regions increases.In addition,the largest warming rates at each intensity level in the different regions occur in the core area,followed in turn by the envelope and outer areas.  相似文献   

厄尔尼诺(El Nino)事件与东南沿海热带气旋活动的相关分析     

孙成志  张胜军 《海洋技术学报》2007,26(4):94-97

统计分析了近50 a(1949～1998年)厄尔尼诺(ELNINO)事件以及我国东南沿海热带气旋历史资料,得出了厄尔尼诺(ELNINO)事件与我国东南沿海热带气旋的活动频数、移动路径、强度以及相关灾害的关系。  相似文献