Data supporting Nica, Anna et al. (2025) "Impact of Galactic Cosmic Rays on Earth's Climate During an Encounter with the Local Lynx Cold Clouds 2-3 Myr Ago"

<Version 1> Data from the GSFC 2D climate chemistry and dynamics model and implementation of version 3 of the CRAC:CRII model developed by Usoskin et al. (2024) supporting Nica, Anna et al. (2025) "Impact of Galactic Cosmic Rays on Earth’s Climate During an Encounter with the Local Lynx Cold Clouds 2-3 Myr Ago". For our implementation of version 3 of the CRAC:CRII model (Usoskin et al. 2024), we provide the Jupyter notebook CRAC3_Nica1.ipynb (in Python 3.8.8) which generates cosmic ray-induced ion pair production profiles dependent on heliospheric modulation, geomagnetic shielding, and geographic latitude. This Jupyter notebook implements functions from the file CRACin.py, which calculates the altitude profiles, and creates and writes to a file called 'F40GCRMM.DAT'. This file contains the GCR-induced ion pair production (in units ion pairs/cm3/s) at altitudes between 85 degrees South to 85 degrees North. Versions of this file for each case are contained in the following .zip files, and then passed into the GSFC 2D model: the solar minimum case (GCRions_phi325.zip) the LIS case, which includes atmospheric ionization from GCRs outside the heliosphere (GCRions_phi0.zip) the LIS-GM case, which includes GCRs from outside the heliosphere and removes geomagnetic shielding of cosmic rays (GCRions_phi0_noRc.zip) We run the GSFC 2D climate chemistry and dynamics model, which we have modified slightly to vary the input of ion pair production induced by GCRs based on our output from the CRAC:CRII model. The following zip files contain the ncl file output by the NASA GSFC 2D atmosphere model in three cases: the solar minimum case (CRAC3phi325_s.zip) the LIS case (CRAC3phi0_s.zip) the LIS-GM case (CRAC3phi0_noRc_s.zip) The Jupyter notebook plot_GSFC_specoutnc_Nica1.ipynb (in Python 3.11.5) plots the output of these runs. - <Version 2> This version adds the file Rc_plots.ipynb, which plots the geomagnetic cutoff rigidity for Earth's dipole magnetic field (using modern day conditions) and during a pole reversal.<版本1> 本数据集采用戈达德太空飞行中心（GSFC）二维气候化学与动力学模型的数据，以及由Usoskin等人（Usoskin et al., 2024）开发的CRAC:CRII模型第3版实现代码，用以支撑Nica、Anna等人（Nica, Anna et al., 2025）的研究论文《2-3百万年前遭遇本地天猫座冷云期间银河宇宙射线对地球气候的影响》。 针对我们所实现的CRAC:CRII模型第3版（Usoskin et al., 2024），我们提供了Python 3.8.8环境下的Jupyter Notebook文件`CRAC3_Nica1.ipynb`，该脚本可生成依赖于日球层调制、地磁屏蔽与地理纬度的银河宇宙射线诱导离子对产生剖面。此Notebook调用了`CRACin.py`中的函数以计算高度剖面，并生成并写入名为`F40GCRMM.DAT`的文件。该文件存储了南纬85°至北纬85°区间内，银河宇宙射线诱导的离子对产生量（单位：离子对/立方厘米·秒）。各工况下的该文件均封装于以下压缩包中，并将作为输入传入GSFC二维模型： 1. 太阳极小期工况：`GCRions_phi325.zip` 2. 局域星际介质（LIS）工况：包含来自日球层外的银河宇宙射线产生的大气电离过程，对应压缩包`GCRions_phi0.zip` 3. LIS-GM工况：包含来自日球层外的银河宇宙射线，且移除了宇宙射线的地磁屏蔽效应，对应压缩包`GCRions_phi0_noRc.zip` 我们对GSFC二维气候化学与动力学模型进行了小幅修改，使其可基于CRAC:CRII模型的输出结果调整银河宇宙射线诱导的离子对产生输入参数。以下压缩包包含了NASA GSFC二维大气模型在三种工况下的ncl输出文件： 1. 太阳极小期工况：`CRAC3phi325_s.zip` 2. LIS工况：`CRAC3phi0_s.zip` 3. LIS-GM工况：`CRAC3phi0_noRc_s.zip` 此外，我们提供了Python 3.11.5环境下的Jupyter Notebook文件`plot_GSFC_specoutnc_Nica1.ipynb`，用于可视化上述模型运行的输出结果。 <版本2> 本版本新增了`Rc_plots.ipynb`文件，用于绘制基于现代地磁条件与磁极反转时期的地球偶极磁场地磁截止刚度曲线。