CAJ | 학술논문

基于集成经验模态分解（EEMD）方法，对1921～2010年天津年平均气温和降水量序列进行了多尺度分析。并结合功率谱对年平均气温和年降水量及其本征模态函数（IMF）分量进行周期分析。结果表明：天津年平均气温的变化主要是由第1、第2本征模态分量和趋势项构成，即准5 a和2～3 a的振荡与“先降后升”的长期趋势变化起主要作用。而第4、第5本征模态分量则反映出天津近90年来气温年代际尺度的冷暖变化，它们对1920年代至1940年代的暖期以及1950年代至1970年代的冷期有重要贡献。降水量的变化主要由第1、第2本征模态分量构成，即4.5 a、准9 a和2～3 a的振荡起主要作用。与气温序列相比，降水序列中年代际尺度的变化和长期趋势的贡献明显要小得多，但也反映了1980年代以后降水减少的趋势。
기우집성경험모태분해（EEMD）방법，대1921～2010년천진년평균기온화강수량서렬진행료다척도분석。병결합공솔보대년평균기온화년강수량급기본정모태함수（IMF）분량진행주기분석。결과표명：천진년평균기온적변화주요시유제1、제2본정모태분량화추세항구성，즉준5 a화2～3 a적진탕여“선강후승”적장기추세변화기주요작용。이제4、제5본정모태분량칙반영출천진근90년래기온년대제척도적랭난변화，타문대1920년대지1940년대적난기이급1950년대지1970년대적랭기유중요공헌。강수량적변화주요유제1、제2본정모태분량구성，즉4.5 a、준9 a화2～3 a적진탕기주요작용。여기온서렬상비，강수서렬중년대제척도적변화화장기추세적공헌명현요소득다，단야반영료1980년대이후강수감소적추세。
A multiscale examination of temperature and precipitation in Tianjin during 1921-2010 was performed using the EMD (Empirical Mode Decomposition) method. Moreover, power spectrum analysis was performed on the IMFs (Intrinsic Mode Functions) derived from EMD. This analysis indicates that the variations of the annual mean temperature are mainly characterized by high-frequency oscillations, with 2-3-year periods and quasi-5-year periods detected in the first two IMFs, and a long-term V-shaped variation in the trend component. In addition, interdecadal variations were detected in the fourth and fifth IMFs. The precipitation series are also mainly characterized by high-frequency oscillations, with periods of 2-3, 4.5, and 9 years detected in the first two IMFs. It is concluded that the interdecadal variations and the long-term trend are more apparent in the temperature series, and therefore have a much smaller contribution to precipitation variation.