星云湖14ka定量温度记录

以“全新世温度难题”为焦点，全新世地球气温变化已成为过去气候变化研究的热点问题。该项工作基于云南星云湖的化石孢粉，利用新发展起来的基于随机数据开展定量重建显著性检验新方法定量重建了研究区过去14000年以来的夏季温度（平均7月温度），发现其与基于该湖沉积物碳酸盐氧同位素的夏季降水记录在变化趋势上存在差异，主要体现在早全新世二者的不耦合变化，即早全新世夏季降水较高，但夏季温度较低。作者进一步提出了以云、气溶胶、北半球高纬冰盖边界条件等主导的地球系统内部反馈作用是造成中国西南地区早全新世夏季降水与温度不耦合的主要原因。

Focusing on the "Holocene temperature conundrum", Holocene Earth temperature change has become a hot topic in paleoclimate change research. This study is based on fossil pollen and spores from Lake Xingyun in Yunnan, and uses a newly developed statistical method for significance test of quantitative reconstruction based on random data to quantitatively reconstruct the summer temperature (July mean temperature) in the study area over the past 14,000 years. It is found that there are divergent trends between this temperature record and the summer precipitation record based on carbonate oxygen isotopes from the lake sediments, which is mainly reflected in the uncoupled changes during the Early Holocene: the Early Holocene featured relatively high summer precipitation but relatively low summer temperature. The authors further propose that internal feedbacks of the Earth system dominated by factors such as clouds, aerosols, and boundary conditions of high-latitude Northern Hemisphere ice sheets are the main cause of the uncoupling between summer precipitation and temperature during the Early Holocene in southwestern China.

搜集汇总

背景与挑战

背景概述

该数据集提供了云南星云湖过去14000年以来的夏季温度定量重建记录，时间分辨率为10到100年，数据大小为15.28 KB。研究发现早全新世夏季降水与温度存在不耦合现象，并提出了地球系统内部反馈作用为主要原因。