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北京白家疃台站重力非潮汐量变化及水储量影响的初步研究
徐伟民,陈石,高孟潭,石磊,卢红艳
Author NameAffiliationE-mail
XU Wei-min Institute of Geophysics CEA xuweimin@cea-igp.ac.cn 
CHEN Shi Institute of Geophysics CEA  
GAO Meng-tan Institute of Geophysics CEA  
Shi Lei Institute of Geophysics CEA  
LU Hong-yan Institute of Geophysics CEA  
摘要:
台站重力非潮汐量变化反映了该区域的连续重力变化规律,本文以北京白家疃台站两台不同类型的连续重力仪的观测记录为基础,研究2008-2011三年间该区域的连续重力变化。引入标准的潮汐预处理软件对观测数据预处理,剔除观测数据中各类干扰信号的影响,同时对连续重力数据中的漂移采用分段曲线拟合,最后滤除各类潮汐分量获取重力非潮汐量。进一步地,通过计算非潮汐量的功率谱密度分析重力非潮汐量中的主要成分;针对其中显著的季节性信号,考虑到陆地水对重力场的影响,引入GRACE卫星重力和CMAP水模型来研究该台站及其他台站地区水储量和重力场变化的相关性。
关键词:  台站重力仪,重力非潮汐量,Tsoft软件,GRACE卫星重力,CMAP水储量模型
DOI:
分类号:
基金项目:中国地震局地球物理研究所基本科研业务专项(DQJB12B20, DQJB12C03, DQJB12B14)
Preliminary analysis of non-tidal variation in Beijing Baijiatuan gravity station and the relevance of gravity changes and water storage
XU Wei-min,CHEN Shi,GAO Meng-tan,Shi Lei,LU Hong-yan
Abstract:
The non-tidal variation gained from continuous gravity observation in station usually reflects the regional continuous gravity changes, in this paper we focus on studying the non-tidal variation of Beijing baijiatuan station, where there are two different gravimeters(namely L R-804 and PET-031). Based on the original raw tidal records of two gravimeters from 2008 to 2011, we first remove various interferences from raw data by the standard procedure software –Tsoft; then we model the solid earth tides, ocean tidal loading and pole tide through related parameters; after that we adopt a new segmented polynomial fitting methods based on Tsoft to fit the complex drift of spring gravimeter; at last we calculate the atmospheric loading effects by a linear regression model. After series of processing we gain the non-tidal variation of two gravimeters at Beijing baijiatuan site. Furthermore, to analyze the non-tidal variation preliminarily, we study the main component of related tidal data by power spectral density. Comparing the non-tidal variation of two different gravimeters and we find seasonal fluctuations in non-tidal results, which are in accordance with the water storage. So we consider the relevance of gravity changes and water storage based on the gravity data of GRACE and water data of CMAP model from 2003 to 2011 at different sites in mainland China (Beijing, Chengdu, Shenyang and Shiquanhe), and make a preliminary analysis on the relationship of gravity changes and water storage.
Key words:  gravimeter  non-tidal variation  Tsoft software  GRACE  CMAP model