Time-variable gravity field due to continental hydrology
HGRA: Time-variable gravity field (as well as geocenter motions) due to
continental hydrology (soil-moisture and snow), up to degree 72.
HGRA directory is sub-divided into the different
ECMWF models used:
- ERA40: 40 year ECMWF
Reanalysis covering the 1970/01 - 2002/08 period.
- ERAin: ECMWF Interim
Reanalysis, starting in 1979/01, and run in almost real-time (a few
- OPERA: ECMWF operational
models, starting in 2000/12, and run in real-time (about one month
delay). The operational model has already experienced some changes in
2006/02, 2007/11 (only hydrology), 2010/01 and 2016/03.
List of data is available here