Improved Non-tidal Atmospheric and Oceanic De-aliasing for GRACE and SLR Satellites

Improved Non-tidal Atmospheric and Oceanic De-aliasing for GRACE and SLR Satellites
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改进 GRACE 和 SLR 卫星的非潮汐大气和海洋去混叠

DOI:
10.1007/978-3-642-10228-8_11
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发表时间:
2010
期刊:
影响因子:
--
通讯作者:
Dobslaw H.
Dobslaw H.
中科院分区:
--
文献类型:
--
作者:
Flechtner F;Thomas M;Dobslaw H.

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非潮汐高频大气和海洋质量变化模型是在GFZ波茨坦作为所谓的GRACE大气和海洋去混叠1B级(AOD1B)产品例行生成的。由于第0版(RL00)和第1版(RL01)中使用的正压海洋模式PPHA存在一些缺陷,因此最新版本的AOD1B是基于斜压海洋环流和潮汐模式(OMCT)的。在本章中,我们总结了操作AOD1B RL04生成的OMCT的配置和改进。由于AOD1B产品的时间分辨率为6 h,S2气潮信号可能无法得到正确的解释,因此,我们进行了一些试验,研究了3 h气象强迫对GRACE卫星轨道和重力场的影响。结果表明,用于校正插值误差的时不变大气潮汐模型是足够精确的,即使完全忽略大气潮汐所引起的误差也低于当前GRACE的误差水平。最后,AOD1B RL04模式已重新处理回1976年的SLR和随后的组合与GRACE数据的一致性处理。LAGEOS得出的C20值与GRACE得出的C20值的第一个结果表明,年度振幅的相关性较高,但也有半年信号的未知性质。
Non-tidal high-frequency atmospheric and oceanic mass variation models are routinely generated at GFZ Potsdam as so-called GRACE Atmosphere and Ocean De-aliasing Level-1B (AOD1B) products. As the barotropic ocean model PPHA used in release 0 (RL00) and 1 (RL01) has shown some deficiencies the latest versions of AOD1B are based on the baroclinic Ocean Model for Circulation and Tides (OMCT). In this chapter, we summarize the configuration and improvements of OMCT for operational AOD1B RL04 generation. As the temporal resolution of AOD1B products is 6 h and therefore S2 air tide signals may not be accounted for properly, some experiments have been made to investigate the influence of 3-hourly meteorological forcing on the resulting GRACE orbits and gravity fields. It turned out that the time-invariant atmospheric tide model used to correct interpolation errors is sufficiently accurate and even the error caused by a complete neglect of the atmospheric tides is below the current GRACE error level. Finally, the AOD1B RL04 model has been reprocessed back to 1976 for a consistent processing of SLR and subsequent combination with GRACE data. First results of LAGEOS derived C20 values with those from GRACE show higher correlations for the annual amplitudes but also semi-annual signals of unknown nature.
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DOI: 10.1111/j.1365-246x.2006.03247.x
发表时间: 2007
影响因子: 2.8
作者:
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通讯作者: Maik Thomas
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DOI: --
发表时间: 2006
期刊:
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