global estimote of geoid's potential, sst and marine geoid based on satellite altimetry data

نویسندگان

علیرضا آزموده اردلان

حسن هاشمی فراهانی

چکیده

using satellite altimetry derived mean sea level (msl), geopotential coefficients in terms of ellipsoidal harmonics from recent satellite gravimetry missions, gravity potential values over a grid consisting of 33,486 points at global sea areas are computed and the mean value of the gravity potential at msl is calculated as a new geoid’s potential value. in this way we have exactly followed the gauss-listing definition of geoid for computation of geoid’s potential value and arrived at the value as the main product of this study. knowing, (1) coordinates of the grid points over msl, (2) the geoid’s potential value, and (3) the potential values at the msl, made it possible to compute the potential difference between msl and geoid potential value, which was next transformed into height difference via bruns formula to arrive at sea surface topography (sst) and a global marine geoid as the second and third products of the study.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

تخمین جهانی پتانسیل ژئوئید، توپوگرافی سطح دریا و ژئوئید بر اساس مشاهدات ارتفاع‌سنجی ماهواره‌ای

Using satellite altimetry derived mean sea level (MSL), geopotential coefficients in terms of ellipsoidal harmonics from recent satellite gravimetry missions, gravity potential values over a grid consisting of 33,486 points at global sea areas are computed and the mean value of the gravity potential at MSL is calculated as a new geoid’s potential value. In this way we have exactly followed the ...

متن کامل

Gravity acceleration at the sea surface derived from satellite altimetry data using harmonic splines

Gravity acceleration data have grand pursuit for marine applications. Due to environmental effects, marine gravity observations always hold a high noise level. In this paper, we propose an approach to produce marine gravity data using satellite altimetry, high-resolution geopotential models and harmonic splines. On the one hand, harmonic spline functions have great capability for local gravity ...

متن کامل

the evaluation of sea surface topography models based on the combination of the satellite altimetry and the global geoid models in the persian gulf

one of the difficulties in using absolute altitudes is the separation between the mean open sealevel and geoid. theoretically, geoid is the base level in absolute altitudes, but practically, the mean open sealevel is used as a base level for absolute altitudes. the difference between these two levels is called as the seasurface topography. in this research, it is dealt the mean sea level modeli...

متن کامل

the evaluation of sea surface topography models based on the combination of the satellite altimetry and the global geoid models in the persian gulf

one of the difficulties in using absolute altitudes is the separation between the mean open sealevel and geoid. theoretically, geoid is the base level in absolute altitudes, but practically, the mean open sealevel is used as a base level for absolute altitudes. the difference between these two levels is called as the seasurface topography. in this research, it is dealt the mean sea level modeli...

متن کامل

Marine gravity anomaly from Geosat and ERS 1 satellite altimetry

Closely spaced satellite altimeter profiles collected during the Geosat Geodetic Mission (-6 km) and the ERS 1 Geodetic Phase (8 km) are easily converted to grids of vertical gravity gradient and gravity anomaly. The long-wavelength radial orbit error is suppressed below the noise level of the altimeter by taking the along-track derivative of each profile. Ascending and descending slope profile...

متن کامل

Deriving 2hz Ers-1 Geodetic Mission Altimetry for Gravity and Marine Geoid Purposes

In the coastal zone (<25 km to the coast) altimetric gravity field determination degrades due to a combination of several factors, where the main reason is the degradation of the quality of the altimeter data. By starting out from the original waveform data and retracking the entire ERS1 GM mission using a highly advanced expert based system of multiple retrackers, the return time from both ope...

متن کامل

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023