Ocean output of NorESM-OC simulation of the Last Glacial Maximum (21 kya)

Output of the sea ice, marine biogeochemistry and physical fields of the last 30 years (year 5571-5600) of a Last Glacial Maximum (LGM) simulation. This simulation was performed with NorESM-OC and includes a sea ice model, ocean circulation model as well as full biogeochemistry with the carbon isotopes (Tjiputra et al., 2020, Geoscientific Model Development). In order to obtain the LGM state, several adjustments were made to the model forcing: 1) use of a glacial atmospheric dust field (Lambert et al., 2015), 2) tuning of the surface salinity restoring (procedure described in Climate of the Past - Morée et al., 2020 and its supplement) 3) adjustment of the land-ocean mask by reducing the ocean volume with ~116m (procedure described in Climate of the Past - Morée et al., 2020 and its supplement), and 4) adjustment of the atmospheric Normal Year Forcing fields to an LGM approximation by applying the atmospheric LGM-PI anomalies of Morée and Schwinger (2020, Earth System Science Data, version 1) to the models original ('pre-industrial') atmospheric forcing. The directory tree is organized in an ice/hist/ folder which contains the monthly sea ice simulation files for all years and an ocn/hist/ which contains annual mean marine biogeochemical (*.hbgcy.*) and physical (*.hy.*) output fields for all years.

本数据集包含末次冰盛期（Last Glacial Maximum, LGM）模拟试验最后30年（模拟年份5571至5600年）的海冰、海洋生物地球化学及物理场输出结果。该模拟采用NorESM-OC模式完成，耦合了海冰模式、海洋环流模式，并完整搭载了包含碳同位素的生物地球化学模块（Tjiputra等，2020，《Geoscientific Model Development》）。为获取末次冰盛期的模式平衡态，需对模式强迫场开展四项调整：1）采用冰期大气尘埃场（Lambert等，2015）；2）调整表层盐度恢复方案（具体流程见《Climate of the Past》——Morée等，2020及其补充材料）；3）通过将海洋体积缩减约116米来修正海陆掩码（具体流程见《Climate of the Past》——Morée等，2020及其补充材料）；4）将Morée与Schwinger（2020，《Earth System Science Data》第1版）提出的大气LGM-工业革命前（Pre-industrial, PI）异常场应用于模式原始的"工业革命前"大气强迫场，以此将常规大气强迫场修正为LGM近似场。该数据集的目录树组织形式如下：ice/hist/文件夹存储所有年份的逐月海冰模拟文件，ocn/hist/文件夹则存储所有年份的年均海洋生物地球化学（*.hbgcy.*）与物理场（*.hy.*）输出字段。