基于孢粉数据的全新世青藏高原降水定量重建

本数据集中表土孢粉数据来源于东亚孢粉数据库(http://eapd.sysu.edu.cn/database/及青藏高原东北缘表土孢粉数据。表土孢粉点的降水数据取自青 藏 高 原 及 周 边（新疆、甘肃、四川部分地区）126个气 象站点1950-1980年 器 测 的 逐 年 年 平均降水数据（数据来自于中国气象科学数据共享服务网http://www.data.ac.cn/xiazai/)由于 地形对气候变化影响很大，因此在 ArcGIS中将分布不均匀的气象台站年均降水数据运用克里金空间插值法转变成青藏高原面上的栅格数据，表土孢粉点所在的降水栅格数据即可以认为是该点的降水实际数据。利用转换函数法选取代表性表土孢粉类型，建立它们与现代气候的线性回归，将化石孢粉组合代入回归关系式，即求得古气候参数。再利用现代类比法(MAT)，假设过去植被类型与气候之间的关系是相对应的，将指示植被类型的地层孢粉谱与现代表土孢粉谱对比，揭示二者之间的相似性，再将其与对应点的现代降水数据进行矩阵运算，就能类比得到地层孢粉所对应的降水数据。

The topsoil pollen data in this dataset are sourced from the East Asian Pollen Database (http://eapd.sysu.edu.cn/database/) and the topsoil pollen data collected at the northeastern margin of the Qinghai-Tibet Plateau. The precipitation data for the topsoil pollen sampling sites were acquired from 126 meteorological stations across the Qinghai-Tibet Plateau and its surrounding regions (parts of Xinjiang, Gansu, and Sichuan), consisting of in-situ instrumentally measured annual average precipitation data from 1950 to 1980. This precipitation dataset is provided by the China Meteorological Science Data Sharing Service Network (http://www.data.ac.cn/xiazai/). Given that topography exerts a significant influence on climatic variation, the unevenly distributed annual average precipitation data from meteorological stations were converted into raster data over the Qinghai-Tibet Plateau using Kriging spatial interpolation in ArcGIS. The precipitation raster data at the exact locations of the topsoil pollen sampling sites can therefore be considered as the actual in-situ precipitation data for those sites. Representative topsoil pollen taxa were selected via the transfer function method, and a linear regression model was established between these taxa and modern climatic parameters. Fossil pollen assemblages were then substituted into the regression equation to derive paleoclimate parameters. Furthermore, the Modern Analogue Technique (MAT) was applied. Assuming that the relationship between past vegetation types and climate remains consistent, stratigraphic pollen spectra indicative of vegetation types were compared with modern topsoil pollen spectra to identify their similarity. Matrix operations were subsequently conducted between these spectra and the modern precipitation data at corresponding sampling sites, enabling the estimation of precipitation data corresponding to the stratigraphic pollen assemblages through analogical analysis.

搜集汇总

背景与挑战

背景概述

该数据集通过孢粉数据定量重建了全新世青藏高原的降水变化，时间跨度为12000年至1500年前，采用现代类比法和线性回归方法，包含多种气候指标，数据以Excel格式存储，适用于古气候研究。