GRACE > DEALIASING

Groupe de Recherche de Géodésie Spatiale Centre national d’études spatiales

DEALIASING

These dealiasing products contain the time-variable 3D gravitational potential of the atmosphere and ocean masses. A mean value of the original grids based on 10 years of data (2001-2010) has been subtracted from the time series, therefore these products represent only the time-variable part of the atmosphere and ocean masses attraction.

They were computed from:

  • The ERA-interim reanalysis of ECMWF (60 model levels, every 3 hours ) for the atmospheric part;
  • The TUGO barotropic model (Florent Lyard, LEGOS/CNRS) for the oceanic response to the ERA-interim pressure and wind forcing (every 3 hours).

The computation was performed by Pascal Gégout (GET/CNRS), integrating the gravitational potential at each model level in order to obtain the total gravitational effect outside the atmospheric masses; this is why it is called a "3D" gravitational potential.

The solid Earth response to this time-variable atmosphere & ocean potential has been taken into account through the use of the kp Love numbers (Gégout P., article in preparation).

Click on the link below to access the dealiasing products (125 Mb/year).

♦ Warning: This service is for the moment in a test phase and is only open to authorized persons. A password is required.

affiche