Validation of GRACE Gravity Fields by In-Situ Data of Ocean Bottom Pressure

Validation of GRACE Gravity Fields by In-Situ Data of Ocean Bottom Pressure
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通过海底压力现场数据验证 GRACE 重力场

DOI:
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发表时间:
2010
期刊:
影响因子:
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通讯作者:
J. Schröter
J. Schröter
中科院分区:
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作者:
A. Macrander;C. Böning;O. Boebel;J. Schröter

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格蕾丝以前所未有的精确度观测地球时间变化的重力场。与大陆水文循环的重力信号相比,反映洋流、密度和海平面变化的局部海洋质量变化对GRACE任务来说是一个挑战。因此,用海底压力的现场观测来验证GRACE对于评估GRACE观测海洋质量再分布的能力是至关重要的。这里,GRACE数据与世界上所有大洋100个地点的现场海底压力进行了比较。展示了最近发布的GRACE产品所取得的进步,并比较了不同数据中心提供的重力场。在一些地区,特别是在海底气压变率较强和卫星覆盖密度较大的高纬度地区,GRACE很好地捕捉到了海洋变率。这是所有重力场解决方案的强大功能。相比之下,其他一些地区在不同的GRACE解决方案之间显示出非常大的差异,这表明去锯齿模型的差异在定义GRACE实际观测当地海洋质量变异性的技能方面发挥了重要作用。
GRACE observes the temporally changing gravity field of the Earth with unprecedented accuracy. Compared to the gravity signals of the continental hydrological cycle, local ocean mass variability reflecting ocean current, density and sea level changes are a challenge for the GRACE mission. Hence, validation of GRACE with in-situ observations of ocean bottom pressure is critical to evaluate the capability of GRACE to observe oceanic mass redistribution. Here, GRACE data is compared with in-situ ocean bottom pressure at a hundred sites located in all of the world’s oceans. The advances made by recent GRACE product releases are shown, and gravity fields provided from different data centres are compared. In some regions, particularly at high-latitude sites with comparatively strong ocean bottom pressure variability and dense satellite coverage, GRACE captures oceanic variability quite well. This is a robust feature for all gravity field solutions. In contrast, some other regions show remarkably large differences between different GRACE solutions, suggesting that discrepancies in de-aliasing models play a major role in defining the skill of GRACE to realistically observe local oceanic mass variability.
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
发表时间: 2010
期刊:
影响因子: --
作者:
Flechtner F;Thomas M;Dobslaw H.
通讯作者: Dobslaw H.
DOI: 10.1007/978-3-642-10228-8_4
发表时间: 2010
期刊: --
影响因子: --
作者:
F. Flechtner;C. Dahle;K. Neumayer;R. König;C. Förste
通讯作者: F. Flechtner;C. Dahle;K. Neumayer;R. König;C. Förste