LegacyPollen2.0: Taxonomically harmonized pollen counts of western North American samples with revised chronologies

This data set consists of the taxonomically harmonized and temporally standardized fossil pollen data from 3680 records. 1122 records are located in North America, 1446 records in Europe, 687 records in Asia, 185 records in South America, 159 in Africa and 81 in the Indo-Pacific region. We expanded the previous version of the LegacyPollen 1.0 data set (Herzschuh et al., 2022; https://doi.org/10.5194/essd-14-3213-2022) with records from the Neotoma Paleoecology Database (https://www.neotomadb.org/; last access: August 31, 2022), ACER 1.0 database (Sánchez Goñi et al., 2017; https://doi.org/10.1594/PANGAEA.870867), Chinese fossil pollen dataset (Zhou et al., 2023, https://www.plant-ecology.com/CN/Y2023/V47/I10/1453 [in Chinese]; Cao et al., 2022, https://doi.org/10.1111/gcb.16274), and our own collection for the Asian sector. Taxonomic harmonization (i.e., woody taxa and major herbaceous taxa have been harmonized to genus level and other herbaceous taxa to family level) and temporal standardization (i.e., re-estimation of age-depth models) follow the previously established frameworks LegacyPollen 1.0 (Herzschuh et al., 2022; https://doi.org/10.5194/essd-14-3213-2022) and LegacyAge 1.0 (Li et al., 2022; https://doi.org/10.5194/essd-14-1331-2022), respectively. In compiling the dataset, we also followed the practices recommended by Flantua et al. (2023; https://doi.org/10.1111/geb.13693) for large-scale paleoecological data synthesis, such as how to select data sources and filter the dataset.Compared to the LegacyPollen 1.0 dataset, we now include the Neotoma DOI (if Neotoma source) in the overview table of site metadata to eliminate the broken chain of static LegacyPollen 2.0 dataset with living (such as updating discovered metadata errors and chronologies) Neotoma and associated risk of data staleness. Furthermore, we also added the PANGAEA Event (PANGAEA dataset identifier) for each new record to ensure that our dataset meets PANGAEA's high standards for quality, usability, and compliance.

本数据集包含3680条经分类学统一校准与时间标准化处理的化石孢粉记录。其中1122条记录分布于北美洲，1446条位于欧洲，687条位于亚洲，185条位于南美洲，159条位于非洲，另有81条记录归属印太区域。
本数据集基于此前发布的LegacyPollen 1.0数据集（Herzschuh等，2022；https://doi.org/10.5194/essd-14-3213-2022）扩充而来，新增数据来源包括：Neotoma古生态数据库（Neotoma Paleoecology Database，https://www.neotomadb.org/；最后访问时间：2022年8月31日）、ACER 1.0数据库（Sánchez Goñi等，2017；https://doi.org/10.1594/PANGAEA.870867）、中国化石孢粉数据集（Zhou等，2023，https://www.plant-ecology.com/CN/Y2023/V47/I10/1453 [中文]；Cao等，2022，https://doi.org/10.1111/gcb.16274），以及我们针对亚洲区域自主采集的记录。
分类学统一校准（即木本类群与主要草本类群统一至属级水平，其余草本类群统一至科级水平）与时间标准化（即重新估算年龄-深度模型）分别遵循LegacyPollen 1.0（Herzschuh等，2022；https://doi.org/10.5194/essd-14-3213-2022）与LegacyAge 1.0（Li等，2022；https://doi.org/10.5194/essd-14-1331-2022）此前建立的规范框架。
在数据集汇编过程中，我们同时遵循了Flantua等（2023；https://doi.org/10.1111/geb.13693）提出的大规模古生态数据合成指南，涵盖数据源遴选与数据集筛选方法。
相较于LegacyPollen 1.0数据集，本数据集在站点元数据总表中新增了Neotoma来源记录的DOI信息，以消除静态版LegacyPollen 2.0数据集与持续更新的Neotoma数据库（例如更新已发现的元数据错误与年代序列）之间的脱节问题，并规避数据过时带来的相关风险。此外，我们还为每条新增记录添加了PANGAEA事件号（PANGAEA数据集标识符），以确保本数据集符合PANGAEA在数据质量、可用性与合规性方面的高标准要求。