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Degree‐2 harmonics of the Earth's mass load estimated from GPS and Earth rotation data
Author(s) -
Gross Richard S.,
Blewitt Geoffrey,
Clarke Peter J.,
Lavallée David
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl019589
Subject(s) - earth's rotation , geodesy , earth (classical element) , snow , geology , rotation (mathematics) , atmosphere (unit) , mass distribution , global positioning system , geophysics , environmental science , atmospheric sciences , meteorology , physics , geometry , geomorphology , telecommunications , mathematics , quantum mechanics , computer science , galaxy , mathematical physics
A fluid, mobile atmosphere and oceans surrounds the solid Earth and upon its land surface lays a continually changing distribution of ice, snow, and ground water. The changing distribution of mass associated with the motion of these surficial fluids changes the Earth's rotation by changing its inertia tensor and changes the Earth's shape by changing the load on the solid Earth. It has recently been demonstrated that large‐scale changes of the Earth's shape, and hence of the mass load causing the Earth's shape to change, can be measured using the global network of GPS receivers. Here, the degree‐2 mass load coefficients determined from GPS data are compared with those obtained from Earth orientation observations from which the effects of tides, winds, and currents have been removed. Good agreement is found between these two estimates of the degree‐2 mass load, particularly at seasonal frequencies.