Designing Earth Gravity Field Missions for the Future: A Case Study
Designing Earth Gravity Field Missions for the Future: A Case Study
复制标题
设计未来的地球重力场任务：案例研究
DOI：
10.1007/978-3-642-10634-7_18
复制
发表时间：
2010
影响因子：
2.6
通讯作者：
P. Visser
中科院分区：
文献类型：
--
作者：
P. Visser
GRACE使命成功地观测到了地球系统质量变化引起的重力场变化。像GRACE这样的单一串联限制了在时间和空间上观察这种质量变化的可实现分辨率。进行了一项模拟研究，以初步评估不同重力卫星编队对时间重力反演的影响，在这种情况下是由水文引起的。这些地层包括一个、两个和四个GRACE型串联的极性地层，以及包括一个极性和一个非极性串联的地层。一个全面的力模型，包括重力场的变化，由于海洋潮汐和水文，大气，海洋学，固体地球和冰的质量变化过程。评估了这些模型中的误差以及星载重力仪观测误差的影响。第一个结果表明，有一个以上的串联有助于减少背景模型，如海洋潮汐误差的影响，仪器观测误差足够低。
Gravity field changes due to mass changes in the Earth system have been observed successfully by the GRACE mission. Having a single tandem like GRACE limits the achievable resolution of observing such mass changes both in time and space. A simulation study was carried out to make a first assessment of the impact of different gravity satellite formations on the retrieval of temporal gravity, in this case caused by hydrology. These formations include polar formations of one, two and four GRACE-type tandems and a formation that includes one polar and one non-polar tandem. A comprehensive force modeling was used including gravity field changes due to ocean tides and hydrological, atmospheric, oceanographic, solid-earth and ice mass change processes. The impact of errors in these models in conjunction with observation errors by the space-borne gravity instruments was assessed. First results indicate that having more than one tandem helps to reduce the impact of errors in background models such as ocean tides, provided that instrument observation errors are sufficiently low.