Sub-monthly Antarctica surface mass changes from GRACE Follow-On Laser Ranging Interferometer measurements
- 1School of Engineering, University of Newcastle, Newcastle, NSW, Australia (mehdi.roofiannaeeni@newcastle.edu.au;shin-chan.han@newcastle.edu.au)
- 2Faculty of Geodesy and Geomatics Engineering, Department of Geodesy, K. N. Toosi University of Technology (mfeizi@mail.kntu.ac.ir;mraoofian@kntu.ac.ir)
We present our on-going study of regional gravity field and surface mass change recovery with an example of Antarctica. We use new parameterization based on spherical cap harmonic (SCH) functions that is suitable for modelling gravitational potential over a spherical cap region. There are a few advantages of efficiency and flexibility in this approach. (1) The nearly identical potential field based on spherical harmonic (SH) functions can be expressed with a substantially less number of parameters in terms of SCH functions. (2) The region-specific constraints can be implemented. (3) Temporal resolution of the gravity recovery can be flexible and adjusted depending of the satellite coverage. We use the instantaneous gravitational data along the satellite orbit such as Line-of-sight Gravity Difference (LGD) time series that are computed directly from the laser ranging interferometer (LRI) measurements of range change between two satellites. We will discuss the methodology and show initial inversion results every 10 days over the Antarctica and discuss possible sub-monthly surface mass variability that we can find from our 10-daily regional surface mass solutions from 2019.
How to cite: Feizi, M., Roofian Naeeni, M., and Han, S.-C.: Sub-monthly Antarctica surface mass changes from GRACE Follow-On Laser Ranging Interferometer measurements, GRACE/GRACE-FO Science Team Meeting 2022, Potsdam, Germany, 18–20 Oct 2022, GSTM2022-83, https://doi.org/10.5194/gstm2022-83, 2022.