Pseudoproxy and frozen-network reconstructions based on the Paleo Hydrodynamics Data Assimilation product (PHYDA).

These are pseudoproxy and frozen-network reconstructions based on PHYDA v1 (https://doi.org/10.5281/zenodo.1198817), though using an updated proxy network based on the updated PHYDA proxy database (https://doi.org/10.5281/zenodo.10352612). The years over which the reconstructions were preformed are indicated in the file name after the letter "r". The total number of proxies used in each reconstruction case is indicated in the file name by the number following the letter "p". Two pure-noise pseudoproxy reconstructions used white-noise proxies and red-noise proxies, with the red-noise proxies mimicking the same auto-regressive characteristics of the real PHYDA proxy input data. Note that by construction, the red-noise pseudoproxy network will have more low-frequency variability than the white-noise pseudoproxy network. These reconstructions were run for the years 850 to 2000. Three pseudoproxy reconstructions varied the white noise level of temperature-based pseudoproxies (signal to noise ratio of 0.25, 0.5, and 1), with the underlying "true" temperature time series drawn from the CESM-LME ensemble number 10 (the prior used for the creation of PHYDA). These reconstructions were run for the years 850 to 2000. Two real-proxy reconstructions are also included here where the proxy networks are frozen from the years 850 and 1000 onwards to the year 2000.本数据集包含基于PHYDA v1（https://doi.org/10.5281/zenodo.1198817）构建的伪代理（pseudoproxy）与冻结网络（frozen-network）重建结果，但其代理网络采用了基于更新版PHYDA代理数据库（https://doi.org/10.5281/zenodo.10352612）的新版本。重建的时间范围可通过文件名中字母“r”后的内容标识；单次重建所用的代理总数量则由文件名中字母“p”后的数字标注。 本数据集包含两组纯噪声伪代理重建实验，分别采用白噪声代理与红噪声代理，其中红噪声代理可复现真实PHYDA代理输入数据的自回归特征。需注意，按照构建逻辑，红噪声伪代理网络的低频变异性高于白噪声伪代理网络。所有此类重建的时间跨度均为850年至2000年。 另有三组伪代理重建实验，针对基于温度的伪代理的白噪声水平进行调整，信噪比分别设为0.25、0.5与1；其基础“真实”温度时间序列取自CESM-LME集合第10号成员（即构建PHYDA时所采用的先验数据集）。此类重建的时间跨度同样为850年至2000年。 本数据集还包含两组真实代理重建结果，其代理网络分别自850年与1000年起冻结至2000年。