CAJ | 학술논문

根据丽水市1953～2010年逐月降水量资料,在利用趋势分析方法对年际、年代际、季度、月份降水变化趋势进行分析的基础上,运用多窗口谱分析方法对降水的周期特征进行研究,并将显著周期信号进行MTM重建,寻找不同时间尺度上的显著周期随时间的振荡演变规律。结果表明：近58 a来,丽水降水量呈下降趋势,约每10 a降水减少10.19 mm,其中春季5月和秋季9月降水量减少最为显著,夏季8月增多最明显。降水周期特征的多窗口谱分析表明,降水在年代际尺度上的12 a周期最显著,且周期振幅随时间变化分布均匀,同时在年际尺度上2～4 a的周期也较明显,且振幅具有缓变包络的特征。
근거려수시1953～2010년축월강수량자료,재이용추세분석방법대년제、년대제、계도、월빈강수변화추세진행분석적기출상,운용다창구보분석방법대강수적주기특정진행연구,병장현저주기신호진행MTM중건,심조불동시간척도상적현저주기수시간적진탕연변규률。결과표명：근58 a래,려수강수량정하강추세,약매10 a강수감소10.19 mm,기중춘계5월화추계9월강수량감소최위현저,하계8월증다최명현。강수주기특정적다창구보분석표명,강수재년대제척도상적12 a주기최현저,차주기진폭수시간변화분포균균,동시재년제척도상2～4 a적주기야교명현,차진폭구유완변포락적특정。
Based on the monthly precipitation data from 1953 to 2010 in Lishui of Zhejiang Province,the change tendency method was used to analyze monthly,seasonal,annual and decadal variation characteristics of precipitation in Lishui,then the precipitation cycle characteristic was analyzed by multi-taper method in order to investigate the cycle evolution of precipitation.The results showed that the precipitation in Lishui presented a decreasing trend with the rate of 10.19 mm/10 a in the past 58 years,in May and September precipitation reduced obviously,but increased in August.It was found that the precipitation was characterized by obvious cycle change with 12 years on decadal scale,and 2-4 years cycle was also obvious with slowly varying envelope characteristics.