REVEALS reconstruction of past vegetation cover with optimized RPP values for African samples

This data set presents the reconstructed vegetation cover for 164 African sites based on harmonized pollen data from the data set LegacyPollen 2.0 and optimized RPP values. Sugita's REVEALS model (2007) was applied to all pollen records using REVEALSinR from the DISQOVER package (Theuerkauf et al. 2016). Pollen counts were translated into vegetation cover by taking into account taxon-specific pollen productivity and fall speed. Additionally, relevant source areas of pollen were also calculated using the aforementioned taxon-specific parameters and a gaussian plume model for deposition and dispersal and forest cover was reconstructed. In this optimized reconstruction, relative pollen productivity estimates for the ten most common taxa were first optimized by using reconstructed tree cover from modern pollen samples and LANDSAT remotely sensed tree cover (Sexton et al. 2013) for Africa. Values for non-optimized taxa for relative pollen productivity and fall speed were taken from the synthesis from Wiezcorek and Herzschuh (2020). The average values from all Northern Hemisphere values were used where taxon-specific continental values were not available. We present tables with optimized reconstructed vegetation cover for all records in Africa. As further details we list a table with the taxon-specific parameters used and a list of parameters adjusted in the default version of REVEALSinR.本数据集基于LegacyPollen 2.0数据集的标准化花粉数据与优化后的相对花粉生产力（Relative Pollen Productivity, RPP）数值，呈现了164个非洲遗址的重建植被覆盖度。本研究借助DISQOVER软件包（Theuerkauf等，2016）中的REVEALSinR工具，将Sugita于2007年提出的REVEALS模型应用于所有花粉记录。通过考虑类群特异性的花粉生产力与沉降速率，将花粉计数转换为植被覆盖度。此外，本研究还借助前述类群特异性参数与用于描述花粉沉积与扩散的高斯羽流模型，计算了花粉的相关源区，并完成了森林覆盖度的重建。在本次优化重建中，研究团队首先利用非洲地区现代花粉样本的重建森林覆盖度与陆地卫星（LANDSAT）遥感获取的森林覆盖数据（Sexton等，2013），对10个最常见孢粉类群的相对花粉生产力估算值进行了优化。未优化类群的相对花粉生产力与沉降速率数值，则取自Wiezcorek与Herzschuh于2020年的综合研究成果。当缺乏类群特异性的区域数值时，本研究采用所有北半球数值的平均值作为替代。本数据集提供了包含非洲所有记录的优化重建植被覆盖度的表格。作为补充细节，本数据集还附上了所用类群特异性参数的表格，以及REVEALSinR默认版本中经过调整的参数清单。