南极Vostok冰芯16万年以来同位素温度及CO_2浓度变化

160 000 years Records of Isotope Temperature and Atmospheric CO_2 from Vostok Ice Core

通过对面极Vostok2038m冰芯分析,取得了距今16万年以来陆地上最完整的气候曲线。末次冰期始于距今11万年,存在两个温暖期,冰盛期温度降低约9℃。末次间冰期比全新世温度高2℃。大气CO_2与温度变化相似,温暖时期CO_2。浓度高,全新世为263ppmv,末次间冰期为272ppmv;冰期时CO_2低,为240—190ppmv。谱分析及多元统计分析表明,气候变化由太阳辐射变化引起的,CO_2对相对弱的太阳辐射效应有增强作用。

The 2 083 m ice core got at Vostok first reveals a continuous climatic series of the past 160 000 years over continental areas. The last glacial period, with two warming intervals, began at about 110 000 years. The temperature in the last Glacial Maximum was about 9℃ colder than the average Holocene temperature. It is confirmed that the warmest part of the Last Interglacial Period was about 2 ℃ warmer than that of the Holocene. There is a similarity between the variation of the atmospheric CO2 concentration and the stable isotope temperature in the ice core. The CO2 concentration was high in warm period with a value of 263 p.p.m.v. in Holocene and 272 p.p.m.v. in the last Interglacial period. The CO2 concentration was low in glacial period with a concentration of 240-190 p.p.m.v.. Based on the spectral analysis and multivariate analhsis. It has been shown that the climatic changes would be triggered by insolation changes, and the CO2 would amplify effects of the insolation which were relatively week.