Sample MERRA analysis

Sample analysis file from MERRA (Modern-Era Retrospective analysis for Research and Applications), produced by NASA (http://gmao.gsfc.nasa.gov/merra/). This contains historical analysed fields (i.e. output from data assimilation) from this global numerical weather prediction modeling system.- Dimensions: 144×288 grid-points in the horizontal with a global coverage on a 1.25 x 1.25 degree geographical grid. There are 42 vertical levels from 1000hPa to 0.1hPa. - There are 8 time-points, representing regular three-hourly snapshots from 2013-06-01 00:00:00 UTC.- There 11 variables with these four dimensions, including dynamical fields (wind components, pressure, temperature, vorticity, geopotential height) and composition (relative humidity, liquid water and ice mixing ratios, ozone mixing ratio).

本数据集为美国国家航空航天局（NASA）生产的现代时代回顾性分析研究与应用（MERRA）的样本分析文件。其中包含了全球数值天气预报模型系统中的历史分析字段（即数据同化输出）。- 数据维度：水平方向上为144×288个网格点，覆盖全球，地理网格分辨率为1.25 x 1.25度。垂直方向上包含42个层级，从1000hPa至0.1hPa。- 存有8个时间点，代表从2013年6月1日00:00:00 UTC起，每隔三小时的定期快照。- 数据包含11个变量，基于上述四个维度，包括动力学场（风速分量、气压、温度、涡度、位势高度）和组成成分（相对湿度、液态水与冰混合比、臭氧混合比）。