MSLP (Mean Sea Level Pressure) field of the Antarctic Mesoscale Prediction System (AMPS) dataset

Data are the MSLP (Mean Sea Level Pressure) field of the Antarctic Mesoscale Prediction System (AMPS) (http://www2.mmm.ucar.edu/rt/amps/) available to download via www.earthsystemgrid.org. Data are 45km resolution for the domain d001 (lower left lat/lon = -24.72209 N, 38.30463 E, upper right lat/lon = -21.82868 N, -144.07805 E). Data are 3-hourly forecasts (t=0 to t=120) made every 12 hours using the Polar Weather Research and Forecasting (WRF) model. Data has been converted from grib to nc, 45km resolution polar stereographic to a 0.5 degree resolution latlon grid and concatenated into a single continuous dataset using the first 4 forecasts from each 12-hours. Where data was missing forecasts from the previous 12-hours are used.Data available: 28/10/2008 to 31/12/2012.Data were processed in this manner to be usable by the Melbourne University cyclone tracking scheme (Murray, R. J., and I. Simmonds (1991) A numerical scheme for tracking cyclone centres from digital data. Part I: Development and operation of the scheme, Australian Meteorological Magazine, 39, 155-166.) to investigate Antarctic polar lows.Data are 3-hourly forecasts (from t=0 to t=120) made every 12 hours, which have been processed into a continuous 3-hourly dataset using the first 4 forecasts of every 12 hours. Missing data are filled by previous forecasts.

本数据集包含南极中尺度预报系统（Antarctic Mesoscale Prediction System, AMPS）的平均海平面气压（Mean Sea Level Pressure, MSLP）场数据，可通过www.earthsystemgrid.org网站下载获取。该数据集针对d001计算区域的分辨率为45km，其左下角经纬度为南纬24.72209度、东经38.30463度，右上角经纬度为南纬21.82868度、西经144.07805度。数据为每12小时生成一组时效范围为t=0至t=120的3小时间隔预报序列，采用极地天气研究与预报（WRF）模型完成计算。原始数据已从GRIB（GRIB）格式转换为NetCDF（nc）格式，并将原极射赤面投影的45km分辨率网格重采样至0.5度分辨率的经纬度网格；同时选取每12小时生成的前4组预报结果进行拼接，得到单份连续完整的数据集。对于存在数据缺失的时段，采用前12小时生成的预报数据进行填补。数据集的时间覆盖范围为2008年10月28日至2012年12月31日。经过上述处理后，本数据集可直接用于墨尔本大学气旋追踪方案（Murray, R. J. 与 I. Simmonds 1991年发表于《澳大利亚气象杂志》第39卷155-166页的《基于数字数据追踪气旋中心的数值方案 第一部分：方案的开发与运行》），用于开展南极极地低压的相关研究。本数据集同样为每12小时生成一组时效范围为t=0至t=120的3小时间隔预报序列，并通过选取每12小时生成的前4组预报结果拼接为连续的3小时数据集，数据缺失时段均采用前序预报数据进行填补。