Improvements in Precise Orbits of Altimetry Satellites and Their Impact on Mean Sea Level Monitoring
Improvements in Precise Orbits of Altimetry Satellites and Their Impact on Mean Sea Level Monitoring
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DOI：
10.1109/tgrs.2017.2670061
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发表时间：
2017-03
影响因子：
8.2
通讯作者：
S. Rudenko;K. Neumayer;D. Dettmering;S. Esselborn;T. Schöne;J. Raimondo
中科院分区：
文献类型：
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作者：
S. Rudenko;K. Neumayer;D. Dettmering;S. Esselborn;T. Schöne;J. Raimondo
最近，GFZ德国地球科学研究中心使用改进的模型，在扩展的ITRF2008地面参考框架中推导出了新的、精确的、一致的轨道（VER11），包括ERS-1、ERS-2、TOPEX/Poseidon、Envisat、Jason-1和Jason-2。与2013年获得的GFZ先前（VER6）轨道相比，这些轨道的质量有所提高。改进的宏观模型将TOPEX/Poseidon、Jason-1和Jason-2卫星激光测距（SLR）观测的均方根拟合值分别降低2.6%、6.9%和7%。用Vienna Mapping Functions 1代替Hopfield模式对卫星多普勒轨道和无线电定位（DORIS）观测对流层进行校正，Envisat和Jason卫星的SLR观测的均方根拟合降低2% ~ 2.4%，DORIS观测的均方根拟合降低2.6%。从2012年7月到2013年7月，使用卫星真姿态代替模型使Jason-1单反RMS拟合提高了41%。VER11轨道表明，不同任务的SLR均方根值在1.2到2.1厘米之间。内部轨道在径向上的一致性在0.5 ~ 1.9 cm之间。使用GFZ VER6和VER11轨道，TOPEX、Jason-1和Jason-2的1993-2014年全球平均海平面趋势分别为2.8和3.0 mm/年。从区域上看，GFZ VER11和外轨道的年代际变化趋势在1 mm/年的量级上变化。
New, precise, consistent orbits (VER11) of altimetry satellites ERS-1, ERS-2, TOPEX/Poseidon, Envisat, Jason-1, and Jason-2 have been recently derived at the GFZ German Research Centre for Geosciences in the extended ITRF2008 terrestrial reference frame using improved models and covering the time span 1991–2015. These orbits show improved quality, as compared with GFZ previous (VER6) orbits derived in 2013. Improved macromodels reduce root mean square (RMS) fits of satellite laser ranging (SLR) observations by 2.6%, 6.9%, and 7% for TOPEX/Poseidon, Jason-1, and Jason-2, respectively. Applying Vienna Mapping Functions 1 instead of Hopfield model for tropospheric correction of Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) observations reduces RMS fits of SLR observations by 2%–2.4% and those of DORIS observations by 2.6% for Envisat and Jason satellites. Using satellite true attitude instead of models improves Jason-1 SLR RMS fits by 41% from July 2012 until July 2013. The VER11 orbits indicate the mean values of the SLR RMS fits between 1.2 and 2.1 cm for the different missions. The internal orbit consistency in the radial direction is between 0.5 and 1.9 cm. The global mean sea level trend for the period 1993–2014 from TOPEX, Jason-1, and Jason-2 is 2.8 and 3.0 mm/year using GFZ VER6 and VER11 orbits, respectively. Regionally, the decadal trends from GFZ VER11 and external orbits vary in the order of 1 mm/year.