Skill testing a three-dimensional global tide model to historical current meter records
| Autor: | Robert B. Scott, James G. Richman, Patrick G. Timko, Brian K. Arbic, E. Joseph Metzger, Alan J. Wallcraft |
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| Rok vydání: | 2013 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Scale (ratio) Meteorology 010505 oceanography Ocean current Structural basin Oceanography 01 natural sciences Tidal current Current (stream) Waves and shallow water Current meter Geophysics Space and Planetary Science Geochemistry and Petrology Climatology Earth and Planetary Sciences (miscellaneous) 14. Life underwater Oceanic basin Geology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Geophysical Research: Oceans. 118:6914-6933 |
| ISSN: | 2169-9275 |
| DOI: | 10.1002/2013jc009071 |
| Popis: | [1] We apply several skill tests to assess tidal currents within a three-dimensional, eddy resolving, global ocean circulation model compared to over 5000 observational velocity records spanning 40 years. We examine the skill of the HYbrid Coordinate Ocean Model (HYCOM) on a regional, basin, and global scale and in deep versus shallow water. On a global scale, we examine the model tidal kinetic energy (KE) compared to the tidal KE estimated from the observational velocity records. We examine the vertical structure of the model tidal KE by averaging over predetermined depth bins. We also investigate the ability of the model to satisfy the 95% confidence intervals of the individual tidal ellipse parameters. On a basin scale, we determine if any bias exists in model performance with regards to a particular part of the global ocean and further investigate if any variability of model skill exists within the ocean basins by testing the model against smaller subsets of the observations. Our results show that the skill of the nondata assimilative HYCOM is comparable to the skill of the altimetric-constrained model TPXO7.2. HYCOM is shown to have up to 20% higher skill in resolving the Greenwich phase of the tides on a global basis and demonstrates moderate skill in replicating the vertical structure of the tidal currents as represented by the current meters. HYCOM demonstrates up to 20% higher skill than TPXO7.2 for some ocean basins and some ocean regions but exhibits up to 20% weaker skill in the Southern Ocean. |
| Databáze: | OpenAIRE |
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