Numerical Atmospheric dispersion Modeling Environment - an operational particle dispersion model using the Met Office Unified Model and ECMWF Numerical Weather Prediction meteorology data - raw, gridded SIPEX II data

This record contains the source, gridded data used to produce the maps described in the metadata record with the ID "SIPEX_II_NAME". See the provided URL. The UK Met Office's Numerical Atmospheric-dispersion Modelling Environment (NAME) is used to model a wide range of atmospheric dispersion events.These data were collected during the SIPEX II voyage of the Aurora Australis, 2012. The use of NAME and the NWP met data was provided by the UK Met Office for free for research purposes. The analysed wind fields used for the running of NAME are calculated using the Met Office's Unified Model (UM). These are calculated by incorporating all observational site data at six hourly intervals into a forecasting system +/- 3 hours of the observation time. This is continuously repeated to produce a 3D analysis of the state of the atmosphere defined by meteorological variables. It is these variables that are incorporated into NAME and are used to calculate wind vectors, particle position, etc. The global resolution for these fields is 25 km.Model DescriptorInert particles released for two hours each day between 01:00 - 03:00. The lat/lon for the ship was taken at 02:00 every day. The particles were tracked backwards in time for ten days. The NAME output grid comprised of 267 by 165 boxes of 0.5652 degrees longitude and 0.375 degrees latitude. The lat/lon minimum was 60.0,-85.0 and the max was 210,-23. The plots show the daily particle densities in g s m-3 per grid box for the whole of the back run. There are four different types of plots showing surface influence (0-100m), whole troposphere influence (0-16000m) and below the avg boundary layer (BL). The BL heights have also been plotted at the time of release for each of the backruns.

本数据集包含用于生成ID为"SIPEX_II_NAME"的元数据记录中所述地图的源网格化数据，详见所提供的URL。英国气象局（UK Met Office）的数值大气扩散模拟环境（Numerical Atmospheric-dispersion Modelling Environment，NAME）被用于模拟各类大气扩散事件。本次采集的数据来自2012年“极光南极号”（Aurora Australis）执行的SIPEX II科考航次。

NAME及数值天气预报（Numerical Weather Prediction，NWP）气象数据由英国气象局免费提供用于科研用途。用于运行NAME的分析风场由该局统一模式（Unified Model，UM）计算生成：每6小时将所有观测站点数据融入预报系统，覆盖观测时刻前后±3小时的时段，该流程持续迭代以生成由气象变量定义的大气状态三维分析场。此类变量被纳入NAME模型，用于计算风矢量、粒子位置等参数。此类分析场的全球分辨率为25公里。

### 模型说明
每日01:00至03:00之间释放惰性粒子，单次释放时长为2小时。每日02:00记录科考船的经纬度坐标。粒子将被反向追踪10天。NAME的输出网格包含267×165个格箱，每个格箱的经度跨度为0.5652°，纬度跨度为0.375°。格点经纬度范围最小值为60.0,-85.0，最大值为210,-23。

本次绘图展示了整个反向模拟过程中，每个格箱的日粒子密度（单位：g·s·m⁻³）。共包含四类绘图结果：地表影响（0-100米）、整个对流层影响（0-16000米）以及平均边界层（boundary layer，BL）以下的影响。同时还绘制了每次反向模拟粒子释放时刻的边界层高度。