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首页> 外文期刊>Ocean Dynamics >Assessing the impact of various wind forcing on INCOIS-GODAS simulated ocean currents in the equatorial Indian Ocean
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Assessing the impact of various wind forcing on INCOIS-GODAS simulated ocean currents in the equatorial Indian Ocean

机译：评估各种风力对赤道印度洋对INCOIS-GODAS模拟洋流的影响

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摘要

The Global Ocean Data Assimilation System configured at Indian National Centre for Ocean Information Services (INCOIS-GODAS) has been forced with satellite-based QuikSCAT gridded winds (QSCAT) to obtain accurate operational ocean analysis, particularly ocean currents, as compared to the default National Centers for Environmental Prediction-Reanalysis 2 (NCEP-R2) wind forcing in the tropical Indian Ocean (TIO). However, after termination of QuikSCAT mission in November 2009, an alternate wind forcing was required for providing operational ocean analysis. The present study examines the suitability of an Advanced Scatterometer (ASCAT)-based daily gridded wind product (DASCAT) for the INCOIS-GODAS. Experiments were performed by forcing INCOIS-GODAS with three different momentum fluxes derived from QSCAT, DASCAT, and NCEP-R2 wind products. Simulated ocean currents from these experiments are validated with respect to in situ current measurements from Research Moored Array for African-Asian-Australian Monsoon Analysis and Prediction (RAMA) buoys. Results suggested that the quality of simulated ocean currents from the daily DASCAT forcing is on par with the QSCAT forcing in the TIO, except for the equatorial Indian Ocean (EIO). Although QSCAT-forced current simulations are slightly better than DASCAT-forced simulations, both QSCAT and DASCAT provide a much better result than NCEP-R2. Our analysis shows that the better simulations of currents over the EIO, with the QSCAT forcing compared to DASCAT forcing, can be attributed to the smoothening of the wind field in the DASCAT compared to QSCAT. The impact of the error in the DASCAT on ocean current analysis is, however, limited to local scales and upper 100 m of water column only. Thus, our study demonstrated that, in the absence of QSCAT, DASCAT is a better alternative for INCOIS-GODAS ocean analysis than the NCEP-R2.
机译：与默认的国家标准相比，印度国家海洋信息服务中心（INCOIS-GODAS）配置的全球海洋数据同化系统已被强制使用基于卫星的QuikSCAT网格风（QSCAT），以获得准确的操作海洋分析，尤其是洋流。热带印度洋（TIO）的环境预测-再分析中心2（NCEP-R2）强迫风。但是，在2009年11月QuikSCAT任务终止后，需要备用风强迫来提供运行中的海洋分析。本研究研究了基于高级散射仪（ASCAT）的日常网格风产品（DASCAT）对于INCOIS-GODAS的适用性。通过用来自QSCAT，DASCAT和NCEP-R2风产品的三种不同动量通量强迫INCOIS-GODAS进行实验。这些实验的模拟洋流已针对非亚澳-澳大利亚季风分析和预测（RAMA）浮标的研究系泊阵列的原位海流测量进行了验证。结果表明，除了赤道印度洋（EIO）以外，每日DASCAT强迫产生的模拟洋流的质量与TIO中的QSCAT强迫具有可比性。尽管QSCAT强制的电流仿真比DASCAT强制的仿真稍好，但是QSCAT和DASCAT都比NCEP-R2提供更好的结果。我们的分析表明，与QSCAT相比，QSCAT强迫与DASCAT强迫相比，EIO上更好的电流模拟可以归因于DASCAT中风场的平滑化。但是，DASCAT中的误差对洋流分析的影响仅限于局部尺度和仅100 m以上的水柱。因此，我们的研究表明，在没有QSCAT的情况下，与NCEP-R2相比，DASCAT是INCOIS-GODAS海洋分析的更好替代方案。

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