CAJ | 학술논문

利用1991—2011年5—9月伊宁市气象站逐小时降水资料，分析了伊宁近21 a降雨特征。结果表明，21 a来伊宁雨日年际变化较为明显，后10 a和前10 a相比，中雨、大雨和暴雨日数均出现增加，但小雨日数明显减少导致总雨日出现了减少。小雨过程发生最多的时段是7月中旬，中雨和大雨过程最多时段同在5月下旬。前半夜为中雨、大雨、暴雨过程最易发生时段，后半夜为小雨过程最易发生时段。逐小时降水量和降水频次呈现较为一致的日变化特征，夜雨多且雨量集中。伊宁的降水主要以短时性降水（1~4h）为主，多发生在前半夜至后半夜，1h降水频次最多的是量级≤1 mm的降水，但1.1~3 mm量级的降水贡献率最高。
이용1991—2011년5—9월이저시기상참축소시강수자료，분석료이저근21 a강우특정。결과표명，21 a래이저우일년제변화교위명현，후10 a화전10 a상비，중우、대우화폭우일수균출현증가，단소우일수명현감소도치총우일출현료감소。소우과정발생최다적시단시7월중순，중우화대우과정최다시단동재5월하순。전반야위중우、대우、폭우과정최역발생시단，후반야위소우과정최역발생시단。축소시강수량화강수빈차정현교위일치적일변화특정，야우다차우량집중。이저적강수주요이단시성강수（1~4h）위주，다발생재전반야지후반야，1h강수빈차최다적시량급≤1 mm적강수，단1.1~3 mm량급적강수공헌솔최고。
Based on hourly precipitation data from May to September during 1991-2011 from Yining meteorological station, the features of rainfall change during recent 21 years were analyzed. Results showed that over the 21 years, the rain days had a significant inter-annual variation. Compared to that during 1991-2000, the rain days of moderate rain, heavy rain, torrential rain increased during 2002-2011, while the days of light rain decreased obviously leading to the total rain days decreased. The light rain occurred most frequently in the middle of July but moderate rain and heavy rain both in the late May. At the first half of night(21:00—02:00),moderate rain, heavy rain and torrential rain occurred most easily, and the light rain at the second half of the night(02:00—08:00). The diurnal variations of hourly precipitation and rainfall frequency were consistent, and their peaks both occurred from 22:00 to 11:00(the next day). The short-term precipitation(1~4 h)was the mainly precipitation in Yining, mainly happened from the early to late mid-night. The rainfall frequency for precipitation less than or equal to 1.0mm in 1 hour was the maximum., however, the contribution of the frequency of the rainfall greater than or equal to 1.1mm but less than or equal to 3.0mm was most significant to the precipitation.