Atmospheric effects on measurements of the Earth gravity field /
- 出版日期：2013.
- 语种：eng
- 出版者：Dep. of Geodesy and Geoinformation of the Vienna Univ. of Technology,
- 页数：141 p. :
- 出版地：Vienna, Austria :
- 第一责任说明：Maria Karbon.
- 尺寸：29 cm.
- 分类号：a810
- ISBN：(pbk.) :
MARC全文
02h0062824 20141115093231.0 101102s2013 au a frb |000|||eng | (pbk.) : CNY209.00 NGL NGL NGL eng eng ; ger a810 Karbon, Maria. Atmospheric effects on measurements of the Earth gravity field / Maria Karbon. Vienna, Austria : Dep. of Geodesy and Geoinformation of the Vienna Univ. of Technology, 2013. 141 p. : ill. ; 29 cm. Geowissenschaftliche Mitteilungen : Veröffentlichung des Departments für Geodäsie und Geoinformation, 1811-8380 ; Heft Nr. 94 "Schriftenreihe der studienrichtung Vermessung und Geoinformation". Includes bibliographic reference. Atmospheric pressure variations are one of the major sources of surface gravity perturbations. The varying atmosphere introduces two disturbing forces in the gravity signal, the so called direct effect or Newtonian attraction, where the measuring object is attracted by the atmospheric mass itself, and secondly the indirect effect or atmospheric loading, where the masses deform the Earth's surface, what again influences the measured gravity signal due to the slightely chnages gravity field.In satellite gravity missions such signals are referred to as aliasing.To eliminate them, the determination of accurate atmospheric gravity field coefficients (AGC) is indispensable. For the determination of AGC it is state of the art to use high resolution numerical weather models which take into account the time-variable three-dimensional distribution of the atmospheric mass. By subtracting the gravity spherical harmonics of the instantaneous atmosphere from the ones of a long term mean field, the residual gravity spherical harmonic series is obtained. It describe the deviation of the actual gravity field from the mean gravity field due to atmospheric mass variations.Ground based gravimetric measurements encounter the same difficulty of eliminating the disturbing signal introduced by the atmosphere.Superconducting gravimeters are usually corrected using the local air pressure, which reduces up to 90-95 % of the atmospheric signal.However, modern superconducting gravimeters require an even better atmospheric correction if small signals are to be identified. For this task the use of three-dimensional modeling of atmospheric mass attraction based on operational numerical weather models has shown promising results. Text in English, abstract in English and German. Geodesy. ; Gravity field. ; Atmosphere. Geowissenschaftliche Mitteilungen ; Heft Nr. 94. aCN b010001 010001 P 206.6 G29w v94 ; h1 ; rCNY209.00 gljx1404