15:30 〜 16:30
[G02-P-19] CryoSat-2-only gravity model of the Arctic ocean: case study in Greenland Sea
The Arctic marine gravity has not been well mapped due to weather conditions or political interests. The polar orbiting satellite altimetry mission (e.g., CryoSat-2) covers the Arctic up to latitude 88 and has the great potential of achieving the Arctic marine gravity maps from altimetry. Combined with the dense across track and improved along track resolution achieved by synthetic aperture processing, the arctic sea ice freeboard and sea level can be achieved and further transformed to the gravity anomalies using the Least Square Collocation (LSC).
In this work, we will derive the marine gravity for Greenland Sea using the remove-compute-restore technique and LSC algorithm. The data preparation is challenging due to the changing operating mask of CryoSat-2 and presenting sea ice in the footprints. A careful data editing scheme combined with sea ice flags will addressed. The existing bathymetry chart of Arctic Ocean, known as IBCAO will be introduced to further reduce the altimetric data. Earlier studies show that using the FFT method, a 4 mGal accuracy can be achieved and with 6 years of data, a better accuracy is expected.
In this work, we will derive the marine gravity for Greenland Sea using the remove-compute-restore technique and LSC algorithm. The data preparation is challenging due to the changing operating mask of CryoSat-2 and presenting sea ice in the footprints. A careful data editing scheme combined with sea ice flags will addressed. The existing bathymetry chart of Arctic Ocean, known as IBCAO will be introduced to further reduce the altimetric data. Earlier studies show that using the FFT method, a 4 mGal accuracy can be achieved and with 6 years of data, a better accuracy is expected.