Monthly mean of short periodic atmosphere and ocean mass variations
Atmosphere and ocean mass variations with periods much shorter than one month cannot be represented by the monthly gravity fields. These mass variations are taken into account during the orbit and parameter determination process by background models (AOD1B: Atmosphere and ocean dealiasing Level 1B product). Consequently the monthly gravity fields do not include these mass variations.
The monthly mean of the short periodic atmosphere and ocean variations is different from zero. The monthly mean of the dealiasing model therefore has to be added back to reconstruct full signal content in the monthly fields. In case of the combined gravity fields the monthly means of the different analysis centers are combined on solution level applying the weights also used for the combination of the individual gravity fields.
The atmosphere and ocean dealiasing products are typically given in 6 hour intervals. The monthly means provided by the individual analysis centers are defined as the mean over all 6 hour intervals within the specific time period considered (in most cases first to last day of the month). Data gaps are not taken into account, assuming that the users will not thin out their observational data to perfectly match the availability of the GRACE data.
The analysis centers AIUB, GFZ and ITSG all use the official AOD1B dealiasing products, therefore only the monthly means of AIUB are shown. GRGS is using MOG2D (???). In the following the monthly AOD1B and MOG2D means for atmosphere (ATM) and ocean (OCN) are visualized.
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