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Sea level change along the Black Sea coast from satellite altimetry, tide gauge and GPS observations

Geodesy and Geodynamics 2016年第1期7卷 50-55页

作者： Nevin B. Avsar Shuanggen Jin Hakan Kutoglu ookhan ourbuz Department of Geomatics Engineering Bulent Eeevit University Zonguldak 67100 Turkey Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China

Sea level change affects human living conditions, particularly ocean coasts. However, sea level change is still unclear along the Black Sea coast due to lack of in-situ measurements and low resolution satellite data. In this paper, sea level change along the Black Sea coast is investigated from joint satellite altimetry, tide gauge {TG） and Global Positioning System （GPS） observations. The linear trend and seasonal components of sea level change are estimated at 8 TG stations （Amasra, Igneada, Trabzon-II, Sinop, Sile, Poti, Tuapse, and Batumi） located along the Black Sea coast, which are compared with Satellite Altimetry and GPS. At the tide gauge stations with long-term records such as Poti （about 21 years） and Tuapse （about 19 years）, the results obtained from the satellite altimetry and tide gauge observations show a remarkably good agreement. While some big differences are existed between Satellite Altimetry and TG at other stations, after adding vertical motion from GPS, correlation coefficients of the trend have been greatly improved from 0.37 to 0.99 at 3 co-located GPS and TG stations （Trabzon-II, Sinop and Sile）.

关键词： Sea level changeBlack seaSatellite altimetryTide gaugeGPS

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

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Geodesy and Geodynamics 2016年第1期7卷 32-38页

作者： ourbuz Gokhan Shuanggen Jin Department of Geomatics Engineering Bulent Eceuit University Zonguldak 67100 Turkey Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China

Global Positioning System （GPS） has been widely used to estimate the total zenith tropo- spheric delay （ZTD） and precipitable water vapour （PWV） for weather prediction and at- mospheric 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, NAO99b, 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 pre- cipitable 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.

关键词： Precipitable water vapour (PWV)Ocean tide modelsGPSRadiosonde

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维普期刊数据库

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