Climate variables and oxygen isotope ratio in precipitation extracted at speleothem sites for three iHadCM3 climate model simulations over the last millennium (810CE-1850CE)

Here we provide time series of three isotope-enabled model simulations of the iHadCM3 Model in supplement to Bühler et al. (2021). Simulation output was extracted at SISAL v.2. sites for the last millennium (810-1850CE). The spatial resolution in the atmosphere is 2.5 by 3.75 degrees in the horizontal with 19 vertical levels, and 1.25 by 1.25 degrees in the ocean, with 20 irregularly spaced vertical levels. Details of the isotope-enabled model extension can be found in Tindall et al. (2009). The model simulations were performed with constant orbital forcing, and time-varying prescribed land cover changes, solar irradiance, volcanic aerosol optical depth and greenhouse gases (CO2, CH4, NO2). Changes in greenhouse gas forcings occur 50 years earlier than other forcings, which should not cause issues in interpretation due to the absence of large trends prior to 1800. We provide output for surface temperature, total precipitation and the precipitation-weighted oxygen isotope ratio extracted by bilinear interpolation at the cave site. To facilitate comparisons we provide both the temporally aggregated output (i.e. model output aggregated to the same temporal resolution as the speleothem data) as well as annual means.

本文提供iHadCM3模型的三组同位素增强型模型（isotope-enabled model）模拟时间序列，作为对Bühler等人（2021）研究的补充。模拟输出提取自SISAL v.2.站点的末次千年（公元810-1850年）数据。大气水平空间分辨率为2.5°×3.75°，含19个垂直层；海洋水平分辨率为1.25°×1.25°，含20个非规则间隔的垂直层。同位素增强型模型扩展的细节可参见Tindall等人（2009）的研究。模型模拟采用恒定轨道强迫，以及时变的预设土地覆盖变化、太阳辐照度、火山气溶胶光学厚度和温室气体（CO₂、CH₄、NO₂）。温室气体强迫的变化比其他强迫早50年发生；由于1800年前无显著趋势，这一差异不会对结果解读造成问题。我们提供通过双线性插值（bilinear interpolation）在洞穴站点提取的地表温度、总降水量及降水加权氧同位素比值（precipitation-weighted oxygen isotope ratio）数据。为便于比较，我们同时提供时间聚合输出（即与洞穴堆积物数据（speleothem data）时间分辨率一致的模型输出）及年平均值。