A new high-resolution model of non-tidal atmosphere and ocean mass variability for de-aliasing of satellite gravity observations: AOD1B RL06
A new high-resolution model of non-tidal atmosphere and ocean mass variability for de-aliasing of satellite gravity observations: AOD1B RL06
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DOI：
10.1093/gji/ggx302
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发表时间：
2017-10
影响因子：
2.8
通讯作者：
H. Dobslaw;I. Bergmann-Wolf;R. Dill;L. Poropat;Maik Thomas;C. Dahle;S. Esselborn;R. König;F. Flechtner
中科院分区：
文献类型：
--
作者：
H. Dobslaw;I. Bergmann-Wolf;R. Dill;L. Poropat;Maik Thomas;C. Dahle;S. Esselborn;R. König;F. Flechtner
重力恢复和气候实验大气和海洋去混叠1B级产品的第06版（RL 06）已准备好用作全球重力研究中的时变背景模型。自1976年以来，该产品的时间分辨率为3小时，斯托克斯系数高达180度。RL 06将潮汐和非潮汐信号分离，由于在大陆区域引入了时不变的参考地形，因此具有改进的长期一致性。方差减少测试与全球distributedin situocean海底压力记录和海面高度异常从Jason-2在一系列不同的频带进行表明RL 06相比，其前身的性能普遍改善。两颗测高卫星的轨道测试仍不确定，但GRACEK波段残差在全球平均值中减少了0.031 nm s-2，在沿着西伯利亚大陆架的许多地方，当应用最新的AOD 1B释放时，减少了0.5 nm s-2以上。因此，我们建议将AOD 1B RL 06用于任何即将进行的卫星重力测量再处理工作。
The release 06 (RL06) of the Gravity Recovery and Climate Experiment (GRACE) Atmosphere and Ocean De-Aliasing Level-1B (AOD1B) product has been prepared for use as a time-variable background model in global gravity research. Available since the year 1976 with a temporal resolution of 3 hr, the product is provided in Stokes coefficients up to degree and order 180. RL06 separates tidal and non-tidal signals, and has an improved long-term consistency due to the introduction of a time-invariant reference orography in continental regions. Variance reduction tests performed with globally distributedin situocean bottom pressure recordings and sea-surface height anomalies from Jason-2 over a range of different frequency bands indicate a generally improved performance of RL06 compared to its predecessor. Orbit tests for two altimetry satellites remain inconclusive, but GRACEK-band residuals are reduced by 0.031 nm s−2in a global average, and by more than 0.5 nm s−2at numerous places along the Siberian shelf when applying the latest AOD1B release. We therefore recommend AOD1B RL06 for any upcoming satellite gravimetry reprocessing effort.