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GRACE / GRACE-FO monthly solutions

The monthly gravity field solutions in terms of normalized spherical harmonic coefficients up to degree and order n = 80 are computed at IfE and provided here. The solutions are obtained using the GRACE-SIGMA software which is designed and developed in the Institute of Geodesy at Leibniz Universität Hannover.

The GRACE-SIGMA is a completely MATLAB-based program and estimates the orbit and gravity field parameters using the direct method or the classical variational approach. A brief overview about the processing details and parameterization can be found here. More details of the processing chain can be found in our EGU 2018 presentation.

The LUH-GRACE solutions are unconstrained monthly gravity field models and are based on the analysis of the K-band range rate observations on board GRACE and span the time period between January 2003 until December 2009 (The solution set will be updated soon for the whole GRACE mission time). The models are individually validated and compared and show full agreement with the solutions provided by the three official centers, CSR, JPL and the GFZ.

 

 

GRACE monthly solutions (download the whole solutions here)

2003

Jan

Feb

Mar

Apr

May

 

Jul

Aug

Sep

Oct

Nov

Dec

2004

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

2005

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

2006

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

2007

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

2008

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

2009

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

 

  

 

GRACE-FO solutions

....coming soon....

 

References:

Naeimi M, Koch I, Khami A. and Flury J. (2018): IfE monthly gravity field solutions using the variational equations, EGU 2018, 8-13 April 2018, Vienna, Austria.

Koch I, Naeimi M, Khami A. and Flury J. (2018): Assessment of force models in the context of gravity field recovery at IfE, EGU 2018, 8-13 April 2018, Vienna, Austria.

Naeimi M.: A modified Gauss-Jackson method for the numerical integration of the variational equations, EGU 2018, 8-13 April 2018, Vienna, Austria.

 

Contact:

Dr. Ing. Majid Naeimi: naeimiife.uni-hannover.de

M.Sc. Igor Koch: kochife.uni-hannover.de