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Evaluation of ocean tide loading effects on GPS-estimated precipitable water vapour in Turkey

Gurbuz Gokhan  Shuanggen Jin  
【摘要】:Global Positioning System(GPS) has been widely used to estimate the total zenith tropospheric delay(ZTD) and precipitable water vapour(PWV) for weather prediction and atmospheric research as a continuous and all-weather technique.However,estimations of ZTD and PWV are subject to effects of geophysical models with large uncertainties,particularly imprecise ocean tide models of inland seas in Turkey.In this paper,GPS data from Jan.1,2010 to Dec.31,2011 are processed using GAMIT/GLOBK at four co-located GPS stations(ISTN,ERZR,SAMN,and IZMI) with Radiosonde from the Turkish Met-Office together with several nearby IGS stations.Four widely used ocean tide models are adopted to evaluate their effects on GPS-estimated PWV,such as IERS recommended FES2004,NAO99 b,CSR4.0 and GOT00.Five different strategies are taken without ocean tide model and with four ocean tide models,respectively,which are used to evaluate ocean tide models effects on GPS-estimated PWV through comparing with co-located Radiosonde.Results showed that ocean tide models have greatly affected the estimation of the precipitable water vapour at stations near coasts.The ocean tide model FES2004 gave the best results when compared to Radiosonde with ±2.12 mm in PWV at stations near coastline.While other ocean tides models agree each other at millimeter level in PWV.However,at inland GPS stations,ocean tide models have less effect on GPS-estimated PWV.

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