NCEP FNL Operational Model Global Tropospheric Analyses, continuing from July 1999

These NCEP FNL (Final) Operational Global Analysis data are on 1-degree by 1-degree grids prepared operationally every six hours. This product is from the Global Data Assimilation System (GDAS), which continuously collects observational data from the Global Telecommunications System (GTS), and other sources, for many analyses. The FNLs are made with the same model which NCEP uses in the Global Forecast System (GFS), but the FNLs are prepared about an hour or so after the GFS is initialized. The FNLs are delayed so that more observational data can be used. The GFS is run earlier in support of time critical forecast needs, and uses the FNL from the previous 6 hour cycle as part of its initialization. The analyses are available on the surface, at 26 mandatory (and other pressure) levels from 1000 millibars to 10 millibars, in the surface boundary layer and at some sigma layers, the tropopause and a few others. Parameters include surface pressure, sea level pressure, geopotential height, temperature, sea surface temperature, soil values, ice cover, relative humidity, u- and v- winds, vertical motion, vorticity and ozone. The archive time series is continuously extended to a near-current date. It is not maintained in real-time.本数据集为美国国家环境预测中心（NCEP）最终业务全球分析数据，采用1度×1度网格，每六小时进行一次业务性准备。该产品源自全球数据同化系统（GDAS），该系统持续收集全球电信系统（GTS）及其他来源的观测数据，以支持多种分析。FNL数据采用与NCEP全球预报系统（GFS）相同的模型生成，但FNL的制备时间大约在GFS初始化后约一小时，以延迟准备以便使用更多观测数据。GFS的运行时间较早，以支持时间敏感的预报需求，并使用前一个6小时周期的FNL作为其初始化的一部分。 分析数据可在地表、从1000百帕至10百帕的26个强制（及其他气压）层面上获取，包括地表边界层和某些sigma层、对流层顶以及少数其他层。参数包括地表气压、海平面气压、位势高度、温度、海表温度、土壤值、冰覆盖、相对湿度、u向和v向风速、垂直运动、涡度和臭氧。 归档的时间序列数据持续扩展至接近当前日期，并不进行实时维护。

搜集汇总

背景与挑战

背景概述

该数据集是NCEP FNL全球对流层分析数据，时间跨度为1999年7月至2026年4月，提供全球1度×1度网格的六小时一次的分析数据，包含多种气象参数，数据格式为WMO GRIB1和GRIB2，总数据量约为902.19 GB。