Updated OCTAS geoid in the northern North Atlantic- OCTAS07

• Main Authors: O. C. D. Omang, A. Hunegnaw, D. Solheim, D. I. Lysaker, K. Ghazavi, H. Nahav
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Geoid; MDT; MSSH; Adjusted Marine Gravity Data; New Airborne Gravity Data; Grav; North Atlantic
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.562.1308; http://www.geology.osu.edu/~jekeli.1/iag-commission2/IUGG2007_files/reviewed_papers/Omang_etal_11997_final.pdf

Abstract. A new gravimetric geoid (OCTAS07v2) is generated using Stokes ’ formula with gravity data as input. As local gravity data, a combination of land gravity data, new and old airborne gravity data, and adjusted marine gravity data has been used. All ma-rine gravity data has been error screened and quality assured by removing dubious data and adjusting the data when necessary. Voids in the gravity data distri-bution were patched with gravity data from satellite altimetry. The OCTAS07v2 geoid was estimated using the remove-compute-restore technique. The long-wave-length signal of the local gravity data was reduced using a Wong-Gore modified Stokes ’ function. The long-wavelength part was represented by a global grav-ity field model based on GRACE data. The OCTAS07v2 geoid model was combined with the OCTAS07 MSS model to create a synthetic Mean Dynamic Topography (MDT) model. In compari-son with the OCCAM MDT, our new synthetic MDT model gave a std. dev. of the residuals of 11 cm. A comparison to the main northern North Atlantic cur-rents show many similar features.