Computing the Marine Geoid Using Satellite Altimetry-Based Gravity Anomalies over the Eastern Mediterranean Sea
Abstract
The marine gravity anomaly can be measured directly using ships. The ship-borne gravity data is reliable. However it is spatially and temporally inadequate and time-consuming process. In contrast, marine gravity data, which is indirectly obtained from altimetry sea surface heights data, provides high temporal and spatial resolution with an accuracy of few mGal levels. In this study, a total of (200622) sea surface height data points from nine altimetry missions namely (Envisat, ERS-1, 2,GFO, SARAL/AltiKa, Jason-1, 2, 3, and TOPEX/Poseidon) is used to recover the marine gravity data in regular gird size of 11over the Eastern Mediterranean sea (3037N, 3237E).The altimetry-derived marine gravity data is validated with (6826) ship-borne data points obtained from International Gravimetric Bureau (BGI). Finally, the marine geoid is derived from the altimetry marine gravity data and compared to the global geoid model (EGM2008) and to the regional geoid model (SY20Geoid). The regional geoid is derived from the geometric approach (N= MSSMDT) using altimetry data and ocean models. KeywordsMarine geoid, Sea surface heights, Marine gravity, satellite altimetry, Mediterranean Sea
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2021
- Bibcode:
- 2021AGUFM.G33A..07M