基于青藏高原冰芯记录探讨高原"全新世温度变化谜题"

The divergence between simulations and reconstructions during the Holocene is named as "the Holocene temperature conundrum". However, temperatures reconstructed from sub-fossil pollen from 642 sites across North America and Europe closely match simulations of CCSM3, suggesting that "the Holocene temperature conundrum" may not exist. It is recently suggested that such a conundrum also existed over the Tibetan Plateau. Therefore, in this proposal we will make use of the high-resolution stable isotopic profiles of the ice cores that were already recovered from the Chongce Ice Cap, the Zangser Kangri Ice Cap and the Shule South Mountains, together with the transfer function of temperature-stable isotope in-situ observations in precipitation over the Tibetan Plateau, and simulations of water isotope general circulation models to reconstruct quantitatively the past climate over the Tibetan Plateau during the Holocene. Moreover, we will assemble our results with the records of other Tibetan ice cores, stalagmite, tree rings, lake sediments, as well as paleo-simulations, to decipher "the Holocene temperature conundrum" over the Tibetan Plateau.

全新世古气候重建结果与气候模式模拟结果存在相反的变化趋势，即所谓的“全新世温度变化谜题”，但最近基于北美和欧洲642个地点的孢粉资料所重建了全新世温度变化，与CCSM3气候系统模式的模拟结果比较一致，不支持存在“全新世温度变化谜题”。有研究者认为青藏高原也存在类似的“全新世温度变化谜题”，因此本申请项目拟选取申请人已在崇测冰帽、藏色岗日冰帽和疏勒南山冰川钻取的多支透底冰芯，通过分析冰芯的高分辨率稳定同位素记录，并基于现代降水稳定同位素观测结果所获得的温度/稳定同位素转换函数、以及全新世降水稳定同位素模拟结果，定量化重建青藏高原全新世温度变化。结合以往冰芯、石笋、树木年轮、湖泊沉积等的研究结果，以及古气候模拟数据，破解青藏高原“全新世温度变化谜题”。

全新世古气候重建结果与气候模式模拟结果存在相反的变化趋势，即所谓的“全新世温度变化谜题”，但最近基于北美和欧洲642个地点的孢粉资料所重建了全新世温度变化，与CCSM3气候系统模式的模拟结果比较一致，不支持存在“全新世温度变化谜题”。有研究者认为青藏高原也存在类似的“全新世温度变化谜题”，因此本申请项目拟选取申请人已在崇测冰帽、藏色岗日冰帽和疏勒南山冰川钻取的多支透底冰芯，通过分析冰芯的高分辨率稳定同位素记录，并基于现代降水稳定同位素观测结果所获得的温度/稳定同位素转换函数、以及全新世降水稳定同位素模拟结果，定量化重建青藏高原全新世温度变化。结合以往冰芯、石笋、树木年轮、湖泊沉积等的研究结果，以及古气候模拟数据，破解青藏高原“全新世温度变化谜题”。