【摘要】 北京石花洞石笋微层是北京地区气候变化最好的高分辨率地质记录之一。为了研究北京地区近１ 千年来气候演化历史中蕴含的周期性规律， 我们采用滑动谱分析的方法提取了石笋微层厚度曲线包含的气候变化周期信息， 发现石笋微层厚度变化最主要的周期成分是２ 年、３．３年、５ 年～６ 年、１０ 年～１２ 年、１６ 年～１８ 年、１３３ 年和１９４ 年等几个周期， 包含了与现代气候年际振荡相同的准３．５ 年周期、准５～６ 年周期和１１ 年周期。而且不同时期有不同的主导周期，在微层厚度大的时期 （Ｗ 阶段）， 各种周期成分强度大； 在厚度薄的时期（Ｄ阶段）， 各种周期成分的强度也小更多还原

【Abstract】 The stalagm ite lam ina is one ofthe high-resolution records in the paleoclim ate research. In order to study the cycles ofclim ate oscillation in Beijing area and their shifts in the last1 ka, a m oving spectralanalysis is used to revealthecharacteristicsofcyclesin the lam inathicknesssequence ofa stalagm ite from Shihua Cave. Itisfound thatthedom i- nantcycles in the tim e series are of2yr, 3.3yr, 5～6yr, 10～12yr, 16～18yr, 133yr and 194yr. Som e ofthese cyclesare close to thecycle of3.5yr, the cycleof5～6yrand the cy- cle of11yrthatare found in m any m odern clim aticrecord. Itm eansthatthe dynam icforc- ing and the clim ate oscillationsin thelast1ka are sim ilarto thoseofm odern clim ate. The 3.3yrcycle isstrongerand continuous before D4 and the 5.8yrcycle is m ore distinctthan the 3.3yrcycle after D4. There are differentdom inant clim ate cycles in different periods. Usually, the dom i- nantcyclesare strongerand clearerwhen thelam inaearethicker. Thedom inantcyclesare weak when the lam inae are thinner. Itm ay reflectthatthe stronger clim ate cycles in the wetperiod could leave m uch clearer prints in the stalagm ite lam inae. Therefore the lam i- nae thicknesscan beused asaproxy ofclim ateoscillation in northern Chinaifthesam ples are carefully selected. Itis noticed thatthe cycles m ay m erge, branch, replace, abruptly appear, disappear or shift in frequency w ith the clim ate evolution. These phenom ena dem onstrate that the clim ate oscillation is nonlinear. Itis very im portantforunderstanding the clim aticoscilla- tion ofBeijing area in the last1 ka.更多还原