CAJ | 학술논문

[目的]分析研究了西北地区历次特大干旱的开端-宁夏西吉县干旱暴雨等极端天气气候事件的变化规律。[方法]用降水距平百分率划分干旱等级并进行统计分析;用季节指数、线形趋势、5年滑动反映干旱变化趋势;时间序列的循环波动用多项式模拟年代际尺度变化,多项式分解的正数部分用柱形图模拟年际尺度变化。[结果]11～6月干旱季节指数大且波动变化;年干旱的总变化趋势呈上升,年代际尺度的干旱以1977年前后最为严重,有约15年、20年的周期,年际尺度的干旱近年急剧上升;对3～5月、9～11月干旱的总趋势、年代际尺度、年际尺度的变化进行了分析讨论。从500hPa高空天气图上对西吉第一场透雨、久旱转雨天气形势进行了归类分型。[结论]这些工作对开展干旱防灾减灾具有重要的参考价值。
[목적]분석연구료서북지구력차특대간한적개단-저하서길현간한폭우등겁단천기기후사건적변화규률。[방법]용강수거평백분솔화분간한등급병진행통계분석;용계절지수、선형추세、5년활동반영간한변화추세;시간서렬적순배파동용다항식모의년대제척도변화,다항식분해적정수부분용주형도모의년제척도변화。[결과]11～6월간한계절지수대차파동변화;년간한적총변화추세정상승,년대제척도적간한이1977년전후최위엄중,유약15년、20년적주기,년제척도적간한근년급극상승;대3～5월、9～11월간한적총추세、년대제척도、년제척도적변화진행료분석토론。종500hPa고공천기도상대서길제일장투우、구한전우천기형세진행료귀류분형。[결론]저사공작대개전간한방재감재구유중요적삼고개치。
[Objective] The aim was to study the characteristics of the changes of extreme weather climate incidents such as severe drought in northwest and rainstorm in Xiji County of Ningxia. [Method] Precipitation anomaly percentage was applied to divide drought level and for statistics analysis. Seasonal index, linear tendency, and 5-years gliding average were used to reflect the trend of drought changes. The circulation wave of temporal sequence used polynomial expression to simulate the interannual variation scale. The positive part of the polynomial expression used bar chart to simulate interannual variation scale. [Result] The index of drought season from November to June was large. The general trend of annual drought was increasing. The drought of interannual scale was most serious around 1977, about 15 and 20 years. The drought in recent years went up. The general situation of drought, interannual scale and changes of interannual scales from March to May and from September to October were discussed. Based on the weather at 500 hPa, the first rain in Xiji and the drought-turning-into-rain situation were classified. [Conclusion]These may provide reference value to the prevention and mitigation of drought.