NCEP/DOE Reanalysis 2 (R2)

This dataset contains products from the NCEP/DOE Reanalysis 2 (R2) Project. The resolution of the R2 model is the same as NCEP/NCAR Reanalysis (R1) project, T62 Gaussian grids with 28 vertical sigma levels. The output fields are saved 4 times a day as in R1. The main objective of the R2 project is to correct known errors in the R1 project and update the parameterizations of the physical processes. Improvements are seen in surface flux fields, hydrological budget, short wave radiation flux, etc. There are also drawbacks found in the outgoing longwave radiation over tropical warm pool and upper-level tropical moisture. R2 plans to reanalyze the data starting from 1979 and going forward only.The main R2 products archived at NCAR consitute of 6 subgroups: pressure level analysis, sigma level analysis, flux term analysis, diagnostic analysis and 6-hour forecasts of flux term and diagnostic terms. All data files are in GRIB format and archived by month.This dataset is updated once a month. Limited amount of recent data are also available at NCEP (https://ftp.cpc.ncep.noaa.gov/wd51we/reanalysis-2/). Earth System Research Laboratory's Physical Sciences Division of NOAA has the same data in netCDF format at https://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis2.html [https://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis2.html].

本数据集包含美国国家环境预报中心/美国能源部（NCEP/DOE）第二套再分析（Reanalysis 2，简称R2）项目的相关产品。R2模式的分辨率与美国国家环境预报中心/国家大气研究中心（NCEP/NCAR）第一套再分析（Reanalysis 1，简称R1）项目一致，采用T62高斯格点，包含28个垂直σ层。其输出场的输出频次与R1项目相同，为每日4次。R2项目的核心目标是修正R1项目中已发现的误差，并更新物理过程参数化方案。该项目在地表通量场、水文收支、短波辐射通量等方面均取得了改进，但也存在缺陷：在热带暖池区的向外长波辐射以及热带高层水汽模拟方面存在不足。R2项目仅对1979年及之后的气象数据开展再分析工作。美国国家大气研究中心（NCAR）归档的主要R2产品分为6个子类：等压层分析场、σ层分析场、通量项分析场、诊断分析场、通量项6小时预报场以及诊断项6小时预报场。所有数据文件均采用GRIB格式，并按月归档。本数据集每月更新一次。用户也可在美国国家环境预报中心（NCEP）的公开地址（https://ftp.cpc.ncep.noaa.gov/wd51we/reanalysis-2/）获取少量近期数据。美国国家海洋和大气管理局（NOAA）地球系统研究实验室物理科学分部提供了该数据集的netCDF格式版本，获取地址为https://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis2.html [https://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis2.html]。

搜集汇总

背景与挑战

背景概述

NCEP/DOE Reanalysis 2 (R2)数据集是一个历史再分析数据集，主要用于辅助研究，包含1979年至2026年的全球大气数据，分辨率为T62高斯网格，28个垂直层。数据集分为6个子组，涵盖压力层、sigma层、通量项和诊断项的分析及预报，数据以GRIB格式按月归档。