SG-WEx: Unified Model output for July 2015 over South Georgia, without island orography (run: u-ab978)

This dataset contains modelling output from the u-ab978 run of a high-resolution (1.5 km horizontal grid, 118 vertical levels up to around 75 km altitude, 30 s timestep) local-area configuration of the Met Office Unified Model run in a box over the island of South Georgia (54S, 36W), as part of the South Georgia Wave Experiment (SG-WEx) project. This run was for the time period July 2015 with a flat orography file for the island. See related dataset for output from a complementary run with the island's orography included for the same time period. These were part of a group of 6 model runs for the SG-WEx project. The aim of the modelling runs was to examine gravity wave generation and deep vertical propagation over this mountainous island. Three model time periods are archived within the SG-WEx dataset collection: January 2015, June 2015 and July 2015, each containing two runs, one including the island's orography and one without. Initial and boundary conditions are supplied by a global forecast to ensure that conditions over the island remain realistic. Meteorological fields such as wind, temperature, pressure etc were outputted and saved in hourly steps. These runs also coincided with radiosonde campaigns launched from the island. Technical details regarding the configuration of these runs is described Vosper (2015, doi:10.1002/qj.2566). Further information and science results can be found in Jackson et al. (2018, doi:10.1175/BAMS-D-16-0151.1) and Hindley (2021, doi:10.5194/acp-2020-465). See online resources linked to this record for further details.

本数据集包含英国气象局统一模型（Met Office Unified Model）u-ab978实验的模拟输出结果。该模型采用高分辨率局域配置：水平网格分辨率1.5 km，垂直层数118层，最高探测高度约75 km，时间步长30 s，模拟区域为以南乔治亚岛（54°S，36°W）为中心的矩形海域。本次模拟作为南乔治亚浪试验（South Georgia Wave Experiment, SG-WEx）项目的一部分开展。本次模拟的时段为2015年7月，使用了该岛屿的平坦地形文件。相关数据集包含同期采用该岛屿真实地形的互补模拟结果。本次模拟属于SG-WEx项目的6组模型模拟任务之一。本次模拟的研究目标为探究这座多山岛屿上空的重力波生成过程与垂直深传播特征。SG-WEx数据集合集中共归档了3个模拟时段：2015年1月、2015年6月及2015年7月；每个时段均包含两组模拟，分别对应启用岛屿真实地形与使用平坦地形的情景。模拟的初始场与边界场由全球预报场提供，以确保岛屿周边的气象条件真实可信。模拟逐小时输出并保存了风场、温度场、气压场等气象场数据。本次模拟与该岛屿开展的无线电探空观测计划同步进行。关于本次模拟配置的技术细节详见Vosper(2015, doi:10.1002/qj.2566)。更多相关信息与科学研究成果可参考Jackson等(2018, doi:10.1175/BAMS-D-16-0151.1)以及Hindley(2021, doi:10.5194/acp-2020-465)。更多细节可查阅本数据集记录关联的在线资源。