The impact of a non-tidal ocean loading model of high temporal resolution on geodetic GPS height time series
作者单位：National Oceanography CentreLiverpoolUK
会议名称：《第三届中国卫星导航学术年会》
会议日期：2012年
学科分类：081802[工学-地球探测与信息技术] 08[工学] 081105[工学-导航、制导与控制] 0818[工学-地质资源与地质工程] 0804[工学-仪器科学与技术] 0811[工学-控制科学与工程]
关 键 词：Non-tidal ocean loading GPS height time series Earth surface deformation Sea level change
摘 要：Non-tidal ocean loading （NTOL） is a crucial geophysical factor in resulting in the seasonal signals undermining geodetic GPS height time *** for the NTOL effects has thus been a critical prerequisite for estimating highly reliable secular rates of vertical crustal *** this study,we focus on whether a high temporal resolution model can benefit the correction for NTOL *** processed four years of GPS data from 26 stations around the North Sea of Europe and employed the Proudman Oceanographic Laboratory Storm Surge Model to correct the height *** and 12-hourly corrections were attempted *** generated 2-hourly heights to investigate the sub-daily signatures of NTOL effects,and also daily heights to assess the potential benefits of NTOL corrections of high temporal resolution to geophysical *** expected,hourly NTOL corrections lead to a reduction of the RMS of daily height residuals from 5.1 to 4.4 mm on average,and also a reduction of 21.2% for the integrated signal power over the seasonal to diurnal frequency ***,when applying the 12-hourly corrections instead,the RMS of daily height residuals is only slightly deteriorated by 0.01 mm on average and at most 0.06 mm,and the reduction of the integrated power for the seasonal to diurnal frequency band falls slightly to 20.4%.Therefore,we demonstrate that estimating the secular rates of vertical crustal motions will not benefit further from finer than 12-hourly NTOL corrections.