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## Determining of the atmospheric gravity corrections using numerical weather models

### Marcin Rajner

#### Abstract

The atmosphere, after the Earth tides, is the main source of disturbance in the gravity measurements. Atmospheric effect can easily reach the value of a few dozens of microgals (1μGal = 10−8ms−2), and cover a subtle geophysical and geodynamics phenomena contained in gravimetric signal. In order to take the advantage of the accuracy of the modern absolute and superconducting gravimeters (single microgal and at least one order better in frequency domain), one needs an accurate enough model of atmospheric impact on gravity. This thesis presents the different methods of computing the atmospheric gravity effects. This includes the classic statistical approach, as well as methods which reflect physical phenomena of the variable atmosphere mass distribution. The latter uses the surface or spatial distribution of meteorological parameters from numerical weather models. The proposed mathematical model is comprehensive description of direct and indirect effects. The advantages and disadvantages of particular method are depicted on the basis of a number of numerical experiments. The detailed description of the impact of selected phenomena, computation parameter selection, and accuracy of meteorological data, is given. The verification of the usefulness of physical methods was given by means of comparison with gravimetric data collected by the Head of Geodesy and Geodetic Astronomy of Warsaw University of Technology and obtained from the Global Geodynamics Project. The results showed that the simplest correction are sufficient in the majority of gravimetric task. However, the complex method are crucial if the microgal level of accuracy is required. This is especially important when periods of several months and longer are considered.
Record ID
WUTa94be57f85e248fe921332ab3d4696c1
Diploma type
Doctor of Philosophy
Author
Title in Polish
Wyznaczanie atmosferycznych poprawek grawimetrycznych na podstawie numerycznych modeli pogody
Title in English
Determining of the atmospheric gravity corrections using numerical weather models
Language
(pl) Polish
Certifying Unit
Faculty of Geodesy and Cartography (FGC)
Discipline
geodesy and cartography / (technology domain) / (technological sciences)
Status
Finished
Start date
18-03-2011
Defense Date
07-11-2014
Title date
07-11-2014
Supervisor
Jerzy Rogowski Jerzy Rogowski,, Chair of Geodesy and Geodetic Astronomy (FGC/CGGA)Faculty of Geodesy and Cartography (FGC)
Internal reviewers
Marcin Barlik Marcin Barlik,, Chair of Geodesy and Geodetic Astronomy (FGC/CGGA)Faculty of Geodesy and Cartography (FGC)
External reviewers
J. Kryński J. Kryński,, Undefined Affiliation
Honored
yes
Pages
117
Internal identifier
2/2014_praca_doktorska
Keywords in English
gravimetry, atmosphere, gravity, gravimetric corrections, numerical weather model
Abstract in English
The atmosphere, after the Earth tides, is the main source of disturbance in the gravity measurements. Atmospheric effect can easily reach the value of a few dozens of microgals (1μGal = 10−8ms−2), and cover a subtle geophysical and geodynamics phenomena contained in gravimetric signal. In order to take the advantage of the accuracy of the modern absolute and superconducting gravimeters (single microgal and at least one order better in frequency domain), one needs an accurate enough model of atmospheric impact on gravity. This thesis presents the different methods of computing the atmospheric gravity effects. This includes the classic statistical approach, as well as methods which reflect physical phenomena of the variable atmosphere mass distribution. The latter uses the surface or spatial distribution of meteorological parameters from numerical weather models. The proposed mathematical model is comprehensive description of direct and indirect effects. The advantages and disadvantages of particular method are depicted on the basis of a number of numerical experiments. The detailed description of the impact of selected phenomena, computation parameter selection, and accuracy of meteorological data, is given. The verification of the usefulness of physical methods was given by means of comparison with gravimetric data collected by the Head of Geodesy and Geodetic Astronomy of Warsaw University of Technology and obtained from the Global Geodynamics Project. The results showed that the simplest correction are sufficient in the majority of gravimetric task. However, the complex method are crucial if the microgal level of accuracy is required. This is especially important when periods of several months and longer are considered.
Project (archive)
Thesis file
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Reviews
• File: 1
recenzja prof. J. Kryński.pdf
• File: 2
recenzja prof. M. Barlik.pdf
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Other files
• File: 1
urn:pw-repo:WUTa94be57f85e248fe921332ab3d4696c1