Reconstructions of paleo winter sea ice concentrations and revised age models for marine sediment cores SO136-111 and E27-23.

The Holocene sea-ice project brings together for the first time, records from the Antarctic continent and deep sea sediments that will allow us to calibrate three sea-ice extent surrogates, validate their use in contrast to satellite observations and explore climatic influence on the physio-ecological environment over the last 10,000 years.

Spreadsheet 1 (appendix A): Complete list of Accelerator Mass Spectrometry (AMS) dating completed on E27-23 from various identified sources with original 14CAge and reported error. Three dates identified as Burckle pers comm. here were provided by Dr Lloyd Burckle (LDEO) to Dr L. Armand for this work. Outlier attributions are identified; the term Averaged identifies the two samples where final calibrated dates were averaged in this work. All remaining AMS dates were converted to calendar ages using the linear-based CALIB07 (Stuiver and Reimer, 1993) with calibration to the Marine13 dataset (Reimer et al., 2013) at 95% confidence (sigma 2) and included a correction for the surface water reservoir age of ~752 years at the site of core E27-23 resolved from the marine radiocarbon reservoir correction database and software available from http://radiocarbon.LDEO.columbia.edu/ (Butzin et al., 2005). The percent Marine Carbon relative attribution is provided. The Median age (Cal Yr BP) used as the final age at each respective (mid) depth is provided.
In Appendix A the dates are all ages in years, however some are uncalibrated ages and others are Cal yr BP (= calendar years before present).
So in terms of headings in Table A:
Raw 14C age yr BP - is the raw age provided by radiocarbon dating without any corrections applied. It is in years before present.
Corrected raw age (RA=752) - is the raw age with a local RA (Reservoir Age) correction applied and is still in years before present.
The remaining ages are calendar years before present having been calibrated.
All formats follow recommendations for reporting raw 14C dates and their calibration ages.

Spreadsheet 2 (appendix B): Comparison of calibration output from the input of accepted 14C dates using OXCAL 4.2 (Bronk Ramsey 2009; Blaauw 2010), and CALIB07 (Stuiver and Reimer, 1993), both using the Marine13 calibration curve (Reimer et al., 2013) at 95.4% confidence (sigma 2) and including a correction for the surface water reservoir age of ~752 years at the site of core E27-23. The calibration output difference between the median Cal Yr BP, regardless of calibration method employed, was greater than or equal to 40 Cal Yr BP. Calibration data from the output of CALIB07 has been used in this paper to determine chronostratigraphy.

Spreadsheet 3 (appendix C): The foraminiferal stable isotope data from E27-23. Ratios of oxygen (delta 18O) measured from the planktonic foraminifer Neogloboquadrina pachyderma sinistral (greater than 150 microns). Isotope values are reported as per mil (%) deviations relative to the Vienna Peedee Belemnite (VPDB).

Spreadsheet 4 (appendix D): The paleo winter sea-ice concentration (wSIC) estimates for marine sediment core SO136-111. The calendar ages, in thousands of years before present (kyr BP), are provided for each sample from core SO136-111. For each of the samples in core SO136-111, we have provided the estimates winter sea-ice concentration (%), along with the associated lower and upper bounds for the 95% confidence interval around the estimated winter sea-ice concentration (%), for both GAM/WSI/13 and GAM/WSI/ETS. The final two columns provide the estimated average annual monthly sea-ice cover for each sample within core SO136-111, originally estimated using the Modern Analogue Technique, by Crosta et al. (2004). Finally, we provide the estimated summer sea surface temperature, again using the Modern Analogue Technique, from Crosta et al. 2004.

Spreadsheet 5 (appendix E): The paleo wSIC estimates for marine sediment core E27-23. The calendar ages, in thousands of years before present are provided for each sample from core E27-23. For each of the samples in core E27-23, we have provided the estimated winter sea-ice concentration (%), along with the associated lower and upper bounds for the 95% confidence interval around the estimates for winter sea-ice concentration (%).

全新世海冰项目（Holocene sea-ice project）首次整合了来自南极大陆与深海沉积物的相关记录，借此可对3种海冰范围代用指标进行校准，结合卫星观测数据验证其应用有效性，并探索过去10000年间气候对生理生态环境的影响。

电子表格1（附录A）：岩芯E27-23的加速器质谱（Accelerator Mass Spectrometry, AMS）测年完整清单，涵盖各已知来源的原始14C年龄与报告误差。其中3个标注为Burckle pers comm.的测年数据由劳埃德·伯克尔博士（LDEO）为本次研究向L·阿尔芒博士提供。异常值已标注；术语"Averaged"指代本研究中最终校准年龄取平均值的两个样品。其余所有AMS测年数据均通过基于线性模型的CALIB07程序（Stuiver与Reimer, 1993）转换为日历年龄，并以95%置信度（2σ）结合Marine13数据集（Reimer等, 2013）进行校准，同时针对岩芯E27-23站位的表层水储层年龄（约752年）进行校正，该校正值通过海洋放射性碳储层校正数据库与配套软件获取，来源为http://radiocarbon.LDEO.columbia.edu/（Butzin等, 2005）。本数据集同时提供了海洋碳相对占比。各对应（中间）深度的最终年龄采用中位日历年龄（Cal Yr BP，即距现在日历年）标注。
附录A中所有年龄均以年为单位，但部分为未校准年龄，其余为Cal Yr BP（距现在日历年）。
就表格A的表头而言：
"Raw 14C age yr BP"：指未经任何校正的放射性碳测年原始年龄，单位为距现在年。
"Corrected raw age (RA=752)"：指经过本地RA（储层年龄，Reservoir Age）校正的原始年龄，单位仍为距现在年。
其余年龄均为经校准的距现在日历年。
所有格式均遵循放射性碳原始测年数据及其校准年龄的报告规范。

电子表格2（附录B）：采用两种方法对已确认的14C测年数据进行校准的结果对比：一是OXCAL 4.2程序（Bronk Ramsey 2009; Blaauw 2010），二是CALIB07程序（Stuiver与Reimer, 1993）；两种方法均以95.4%置信度（2σ）结合Marine13校准曲线（Reimer等, 2013），并针对岩芯E27-23站位的表层水储层年龄（约752年）进行校正。不同校准方法得到的中位Cal Yr BP差值大于或等于40个距现在日历年。本研究采用CALIB07程序的校准结果构建年代地层框架。

电子表格3（附录C）：岩芯E27-23的有孔虫稳定同位素数据。测量对象为粒径大于150微米的左旋厚壁新方球虫（Neogloboquadrina pachyderma sinistral）的氧同位素比值（δ18O），同位素值以相对于维也纳佩德雷贝箭石标准（Vienna Peedee Belemnite, VPDB）的千分比偏差形式报告。

电子表格4（附录D）：海洋沉积岩芯SO136-111的古冬季海冰浓度（winter sea-ice concentration, wSIC）估算结果。岩芯每个样品均标注了距今千年（kyr BP，即千年前至今）的日历年龄。针对SO136-111岩芯的每个样品，本研究提供了冬季海冰浓度（%）估算值，以及GAM/WSI/13和GAM/WSI/ETS两种模型下该估算值的95%置信区间上下限。最后两列提供了SO136-111岩芯各样品的年平均月海冰覆盖度估算值，该数据最初由Crosta等（2004）采用现代类比法（Modern Analogue Technique）估算得到。此外，本研究还提供了Crosta等（2004）通过现代类比法估算的夏季海表温度。

电子表格5（附录E）：海洋沉积岩芯E27-23的古wSIC估算结果。岩芯每个样品均标注了距今千年的日历年龄。针对E27-23岩芯的每个样品，本研究提供了冬季海冰浓度（%）估算值，以及该估算值对应的95%置信区间上下限。