【摘要】 晚新生代以来黄土高原古气候参数的定量、半定量重建一直是黄土古气候领域研究的热点问题。通过利用磁化率-古降水和红度a~*值-古温度转换函数,并结合古植被重建结果对黄土高原灵台剖面古气候参数的综合重建,初步结果表明:7.1~4.5 Ma可能受到青藏高原隆升的驱动,气候变的相对暖湿,年均温度和年均降水从9.8±4.3℃和456±98 mm增加到晚新生代以来最大的12.5±4.2℃和531±170 mm;4.5~2.6 Ma随着全球降温和上新世青藏高原隆升,气候趋于干冷,年均温度和年均降水变为10.4±3.9℃和508±43 mm;2.6~1.8 Ma年均温度降低到为8.4±3.4℃,年均降水减小为462±113 mm;1.8~0.5 Ma,随着全球降温的进一步持续,以及中更新世青藏高原的再次隆升,气候变的相对干冷,年均温度和年均降水分别变为8.5±1.7℃和457±118 mm;0.5~0 Ma,可能受到高原隆升和冰期旋回的共同作用,黄土高原干冷化显著,年均温度和降水分别减小为7.4±2.6℃和442±78 mm。更多还原

【Abstract】 Quantitative reconstruction of paleo-climatic parameters of late Cenozoic has been a hot topic during the loess-paleoclimate realm.Combining the MS-paleoprecipitation model and redness-paleotemperature model with paleo-vegetation reconstruction results,comprehensively quantitative reconstruction of paleoclimatic parameters of Lingtai profile in Loess Plateau is accomplished.The preliminary results show that:During 7.1~4.5 Ma,the mean annual temperature(MAT) and mean annual precipitation(MAP)increased from 9.8 ±4.3℃ and 456 ±98 mm to maximum of late Cenozoic(12.5 ±4.2℃ and 531±170 mm)driving probably by Tibetan Plateau uplift;Then,with the global cooling and the rapid uplift of the Tibetan Plateau,the climate of Loess Plateau tends to be arid and cold during 4.5~2.6 Ma,with MAT and MAP declining to 10.4±3.9℃ and 508±43 mm,respectively;In the early quaternary from2.6 to 1.8 Ma,the MAT and the MAP reduced to 8.4±3.4℃ and 462±113 mm,respectively;Moreover,from 1.8 to 0.5 Ma,along with the global cooling further continuous and the rapid uplift of Tibetan plateau again during the mid-Pleistocene,the climate get relatively dry and arid,with MAT and MAP changing to 8.5±1.7℃ and 457 ±118 mm;Finally,when the Tibetan Plateau further uplift and the initiation of global long glacial-interglacial cycle during 0.5~0 Ma,the MAT and MAP deceased significantly to 7.4 ±2.6℃ and 442±78 mm,respectively.更多还原