NCEP FNL Operational Model Global Tropospheric Analyses, April 1997 through June 2007

The Final (FNL) global tropospheric analyses archived here were produced by NCEP's Global Forecast System (GFS), which was run operationally at 12-hour intervals to make multiple-day weather forecasts, from April 1997 through June 2007. FNLs are analyses that are produced after the model has completed the forecast cycle, and they include the most complete set of observations available for a given cycle. The FNL from a given cycle, which is the best available analysis, is then used in the initialization of the next cycle.

FNL Data are available on pairs of 2.5-degree hemispheric grids (North and South) at the Earth's surface, sixteen vertical levels from 1000 millibars up to 10 millibars, the tropopause, boundary layer, two subsurface levels, and a few others. Parameters include surface pressure, sea level pressure, geopotential height, temperature, sea surface temperature, potential temperature, relative humidity, snow depth (weekly, Northern Hemisphere only) precipitable water, u- and v- winds, and vertical motion.

本数据集中存储的最终（FNL）全球对流层分析由美国国家环境预报中心（NCEP）的全球预报系统（GFS）生成，该系统自1997年4月至2007年6月以12小时为周期进行运行，以进行多日天气预报。FNL分析是在模型完成预报周期后生成的，并包含了给定周期内可用的最完整观测数据集。特定周期的FNL分析，即最佳可用分析，随后被用于下一周期的初始化中。
FNL数据以地球表面的2.5度半球网格（北半球和南半球）对的形式提供，包括从1000百帕到10百帕的十六个垂直层次，直至对流层顶、边界层、两个次地表层以及其他一些层次。参数包括地表气压、海平面气压、大地水准面高度、气温、海表温度、潜在温度、相对湿度、积雪深度（仅北半球，每周更新）、降水量、u向和v向风速以及垂直运动。