气象
氣象
기상
METEOROLOGICAL MONTHLY
2009年
12期
118-125
,共8页
雷正翠%夏文梅%周霖华%吴焕勤%姚丽娜%张备
雷正翠%夏文梅%週霖華%吳煥勤%姚麗娜%張備
뢰정취%하문매%주림화%오환근%요려나%장비
雷暴%统计特征%趋势系数%小波分析%回波特征
雷暴%統計特徵%趨勢繫數%小波分析%迴波特徵
뇌폭%통계특정%추세계수%소파분석%회파특정
thunderstorm%statistical characteristics%tendency coefficient%wavelet analysis%echo characters
利用常州基本观测站1952-2007年长序列的雷暴观测资料和多普勒雷达回波资料,采用数理统计和小波变换方法,对常州雷暴的变化规律、周期特征以及雷达回波特征进行了分析.结果表明:(1)雷暴日数年代际间差异显著.(2)雷暴年际变化很大,最大值为最小值的5.9倍;雷暴日数总体呈显著减少的趋势.(3)夏季为雷暴高发季节,占总雷暴日数的66.8%.(4)月际变化差异大,雷暴集中出现在4-9月,其中7、8月为雷暴高发月.(5)从日分布来看,傍晚出现次数最多,其次为下午,上午出现最少.(6)常州年雷暴日数分布主要表现为12a(年代际)震荡周期贯穿在整个56年里;1952-2004年存在着非常明显7a左右的次周期特征;1968-2007年还存在3~4a的小周期特征.(7)常州雷暴的雷达回波基本反射率因子一般在30~65dBz之间,回波顶高为6~17km.(9)常州雷暴雷达回波移向主要有五类:西南东北向、东南西北向、西北东南向、旋转、局地生成.另外对常州雷雨大风和冰雹进行了统计分析,发现:7月为雷雨大风最高发月;5月和7月为冰雹最高发月.
利用常州基本觀測站1952-2007年長序列的雷暴觀測資料和多普勒雷達迴波資料,採用數理統計和小波變換方法,對常州雷暴的變化規律、週期特徵以及雷達迴波特徵進行瞭分析.結果錶明:(1)雷暴日數年代際間差異顯著.(2)雷暴年際變化很大,最大值為最小值的5.9倍;雷暴日數總體呈顯著減少的趨勢.(3)夏季為雷暴高髮季節,佔總雷暴日數的66.8%.(4)月際變化差異大,雷暴集中齣現在4-9月,其中7、8月為雷暴高髮月.(5)從日分佈來看,傍晚齣現次數最多,其次為下午,上午齣現最少.(6)常州年雷暴日數分佈主要錶現為12a(年代際)震盪週期貫穿在整箇56年裏;1952-2004年存在著非常明顯7a左右的次週期特徵;1968-2007年還存在3~4a的小週期特徵.(7)常州雷暴的雷達迴波基本反射率因子一般在30~65dBz之間,迴波頂高為6~17km.(9)常州雷暴雷達迴波移嚮主要有五類:西南東北嚮、東南西北嚮、西北東南嚮、鏇轉、跼地生成.另外對常州雷雨大風和冰雹進行瞭統計分析,髮現:7月為雷雨大風最高髮月;5月和7月為冰雹最高髮月.
이용상주기본관측참1952-2007년장서렬적뇌폭관측자료화다보륵뢰체회파자료,채용수리통계화소파변환방법,대상주뇌폭적변화규률、주기특정이급뢰체회파특정진행료분석.결과표명:(1)뇌폭일수년대제간차이현저.(2)뇌폭년제변화흔대,최대치위최소치적5.9배;뇌폭일수총체정현저감소적추세.(3)하계위뇌폭고발계절,점총뇌폭일수적66.8%.(4)월제변화차이대,뇌폭집중출현재4-9월,기중7、8월위뇌폭고발월.(5)종일분포래간,방만출현차수최다,기차위하오,상오출현최소.(6)상주년뇌폭일수분포주요표현위12a(년대제)진탕주기관천재정개56년리;1952-2004년존재착비상명현7a좌우적차주기특정;1968-2007년환존재3~4a적소주기특정.(7)상주뇌폭적뢰체회파기본반사솔인자일반재30~65dBz지간,회파정고위6~17km.(9)상주뇌폭뢰체회파이향주요유오류:서남동북향、동남서북향、서북동남향、선전、국지생성.령외대상주뇌우대풍화빙박진행료통계분석,발현:7월위뇌우대풍최고발월;5월화7월위빙박최고발월.
By using the long series observational data of thunderstorms in Changzhou from 1952 to 2007 and Doppler radar data,the variation,periodic chamcteristics and echo characters of thunderstorrns are studied by means of mathematical statistics and the wavelet analysis.The results show that the interdecadal thunderstorm variability is great,and the annual number of thunderstorm day has a decreasing trend.The interannual variation in thunderstorm day number is comparatively large with the maximum being 5.9 times the minimum.The obvious seasonal variation of thunderstorms can also be detected, and the period of April to September is more frequent months for thunderstorms and their occurrence in July and August is the most, and over 66.8% thunderstorms occur in summer season. From the diurnal distribution, the highest number is in the evening, followed by the afternoon, at least in the morning. The results from wavelet analysis show that the annual number of thunderstorm days in Changzhou has a period of about 12 years within nearly 56 years and there is a period of about 7 years from 1952 to 2004. In addition, there is still three to four years of small cycle characteristics from 1968 to 2007. It is found that the radar basic reflectivity of thunderstorms in Changzhou is from 30 to 65dBz and the echo top-high is between 6 to 17km and the thunderstorm radar echoes are in five major shifts: the southwest to northeast, the southeast to northwest, the northwest to southeast, the rotation, and the local generation. The strong wind and hail storm in Changzhou are analyzed using statistical analysis methods. It is found that the thunderstorm winds occurring in July rank on top and the hail occurs the most in May and July.