High resolution dynamic ocean topography in the Southern Ocean from GOCE
High resolution dynamic ocean topography in the Southern Ocean from GOCE
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DOI：
10.1111/j.1365-246x.2012.05531.x
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发表时间：
2012-08-01
影响因子：
2.8
通讯作者：
Schroeter, J.
中科院分区：
文献类型：
--
作者：
Albertella, A.;Savcenko, R.;Schroeter, J.
利用高分辨率重力场和稳态海洋环流探测器(GOCE)重力模式和1992年10月至2010年4月卫星测高组合得到的新平均海面，计算了平均动态海洋地形(MDT)。所考虑的重力模型是GO-CONS-GCF-2-TIM-R3，它使用12个月的GOCE重力场数据计算大地水准面。GOCE重力数据允许对MDT进行更详细和准确的估计。这一点在南大洋得到了说明，与使用GRACE重力场模型ITG-GRACE2010计算的MDT相比，那里的委托误差从20厘米减少到5厘米。由于MDT更加详细和准确，利用MDT计算地转速度现在可以有更高的精度和空间分辨率，对南大洋的误差估计约为7厘米S-1。
A mean dynamic ocean topography (MDT) has been computed using a high resolution GOCE (Gravity field and steady-state Ocean Circulation Explorer) gravity model and a new mean sea surface obtained from a combination of satellite altimetry covering the period 1992 October till 2010 April. The considered gravity model is GO-CONS-GCF-2-TIM-R3, which computes geoid using 12 months of GOCE gravity field data. The GOCE gravity data allow for more detailed and accurate estimates of MDT. This is illustrated in the Southern Ocean where the commission error is reduced from 20 to 5 cm compared to the MDT computed using the GRACE gravity field model ITG-Grace2010. As a result of the more detailed and accurate MDT, the calculation of geostrophic velocities from the MDT is now possible with higher accuracy and spatial resolution, and the error estimate is about 7 cm s-1 for the Southern Ocean.