Numerical Simulations of Short-Term Non-tidal Ocean Mass Anomalies

Numerical Simulations of Short-Term Non-tidal Ocean Mass Anomalies
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短期非潮汐海洋质量异常的数值模拟

DOI:
10.1007/978-3-642-10228-8_10
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发表时间:
--
期刊:
影响因子:
--
通讯作者:
Thomas
Thomas
中科院分区:
--
文献类型:
--
作者:
Dobslaw;Thomas

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短期非潮汐海洋质量异常目前正在通过海洋环流和潮汐模式(OMCT)在标准GRACE重力场处理中减少。在确定用于大气-海洋去混叠产品(AOD)RL 04的模式配置时进行的数值敏感性试验包括考虑欧洲中期天气预报中心(ECMWF)的短期预报,包括累积风应力,考虑大气和大陆淡水通量,以及处理总海洋质量的时间变化。对模拟海洋质量异常的分析表明,累积风应力的好处并不超过相应分析的预测中所含的误差。淡水通量对海洋质量异常的影响一般很小。大陆淡水通量在月时间尺度和更长的时间尺度上特别占主导地位,因此可以忽略它们用于AOD目的。因此,在操作模拟中,海洋总质量在每一个时间步都被人为地保持恒定。合理的季节性变化只能在每年对数据进行去趋势化之后才能获得,而这在操作设置中无法执行。
Short-term non-tidal ocean mass anomalies are currently reduced within the standard GRACE gravity field processing by means of the Ocean Model for Circulation and Tides (OMCT). Numerical sensitivity tests performed while defining the model configuration to be used for the atmosphere-ocean de-aliasing product (AOD) RL04 include the consideration of the European Centre for Medium-Range Weather Forecasts (ECMWF) short-term forecasts including accumulated wind stresses, the consideration of atmospheric and continental freshwater fluxes, and the treatment of time-variations of the total oceanic mass. Analyses of simulated ocean mass anomalies suggest that benefits of accumulated wind stresses do not outweigh errors contained in the forecasts with respect to the corresponding analyses. The impact of freshwater fluxes is generally small on ocean mass anomalies. Continental freshwater fluxes are in particular dominant on monthly time-scales and longer, allowing to neglect them for AOD purposes. Consequently, the total ocean mass is artificially held constant at every time-step in the operational simulations. Reasonable seasonal variations could have been only obtained after a yearly de-trending of the data, which cannot be performed in an operational setup.
DOI: --
发表时间: 2008
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