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Home > Research > Era > ERA-40

ERA-40

ERA Project
Reanalysis at ECMWF
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ERA-40
ERA-15
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Background


The new reanalysis project ERA-40 will cover the period from mid-1957 to 2001 including the earlier ECMWF reanalysis ERA-15, 1979-1993.



The main objective is to promote the use of global analyses of the state of the atmosphere, land and surface conditions over the period.



The three dimensional variational technique will be applied using the T159L60 version of the Integrated Forecasting System to produce the analyses every six hours. Analysis involves comprehensive use of satellite data, starting from the early Vertical Temperature Profile Radiometer data in 1972, then later including TOVS, SSM/I, ERS and ATOVS data. Cloud Motion Winds will be used from 1979 onwards.



ERA-40 products will also revitalize the use of data from past field experiments such as the 1974 Atlantic Tropical Experiment of the Global Atmospheric Research Program, GATE, 1979 FGGE, 1982 Alpine Experiment, ALPEX and more recent 1992-1993 TOGA-COARE.



Most of the older observations for ERA-40 have been made available by NCAR.



ERA-40 will provide a new potential for studying longer term trends and fluctuations such as ENSO and QBO.


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