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Reanalysis-1 / Reanalysis-2

The National Centers for Environmental Prediction (NCEP) contributes to two global reanalysis projects in cooperation with the National Center for Atmospheric Research (NCAR) and the Department of Energy (DOE). Both reanalyses are global, gridded, and are initialized with source data from surface level instruments, upper air balloons, aircraft, and satellites.

Product Types

NCEI provides access to gridded data from Reanalysis-2 as both a 6-hourly reanalysis, and monthly means. 

Note: Reanalysis-2 ingest data at NCEI stopped with a complete, fixed period of record of 01 Jan 1979 through 30 Sep 2005. Additional Reanalysis-2 data is available through the Climate Prediction Center (CPC) Reanalysis-2 home page.

6-Hourly Reanalysis

ModelGrid/ScalePeriod of RecordModel CycleOutput TimestepData Access Links
6-Hourly Reanalysis-2Global, 2.5° by 2.5°01Jan1979 - 30Sep2005Monthly6-hourly, 00-18UTCHTTPS  HAS

Monthly Means

ModelGrid/ScalePeriod of RecordModel CycleOutput TimestepData Access Links
Reanalysis-2 Monthly MeansGlobal, 2.5° by 2.5°Jan1979 - Mar2006MonthlyMonthly
HTTPS  HAS

Specifications

NCEP/NCAR Reanalysis (Reanalysis-1)

Reanalysis-1 begins 1948, but the data assimilation pattern changes when satellite input (1979—present) is incorporated. This makes the reanalysis inconsistent, but still scientifically valid. 

Coordinates: 
Global

Time Frame: 
1948—Present

Resolution: 
2.5°x2.5° horizontal grid
Reanalysis-1 home Page

NCEP/DOE Reanalysis (Reanalysis-2)

Reanalysis-2 begins in 1979 to coincide with the start date of modern satellite weather ingest.

Coordinates: 
Global

Time Frame: 
1979—Present

Resolution: 
2.5°x2.5° horizontal grid
Reanalysis-2 home Page