مورد إلكتروني
Accuracy Assessment of Global Barotropic Ocean Tide Models
| العنوان: | Accuracy Assessment of Global Barotropic Ocean Tide Models |
|---|---|
| المصدر: | DTIC |
| بيانات النشر: | 2014-08-07 |
| تفاصيل مُضافة: | NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV Stammer, D Ray, R D Andersen, O B Arbic, B K Bosch, W Carrere, L Cheng, Y Chinn, D S Dushaw, B D Egbert, G D |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | The accuracy of state-of-the-art global barotropic tide models is assessed using bottom pressure data, coastal tide gauges, satellite altimetry, various geodetic data on Antarctic ice shelves, and independent tracked satellite orbit perturbations. Tide models under review include empirical, purely hydrodynamic (forward), and assimilative dynamical, i.e., constrained by observations. Ten dominant tidal constituents in the diurnal, semidiurnal, and quarter-diurnal bands are considered. Since the last major model comparison project in 1997, models have improved markedly, especially in shallow-water regions and also in the deep ocean. The root-sum-square differences between tide observations and the best models for eight major constituents are approximately 0.9, 5.0, and 6.5 cm for pelagic, shelf, and coastal conditions, respectively. Large intermodel discrepancies occur in high latitudes, but testing in those regions is impeded by the paucity of high-quality in situ tide records. Long-wavelength components of models tested by analyzing satellite laser ranging measurements suggest that several models are comparably accurate for use in precise orbit determination, but analyses of GRACE intersatellite ranging data show that all models are still imperfect on basin and subbasin scales, especially near Antarctica. For the M2 constituent, errors in purely hydrodynamic models are now almost comparable to the 1980-era Schwiderski empirical solution, indicating marked advancement in dynamical modeling. Assessing model accuracy using tidal currents remains problematic owing to uncertainties in in situ current meter estimates and the inability to isolate the barotropic mode. Velocity tests against both acoustic tomography and current meters do confirm that assimilative models perform better than purely hydrodynamic models. Published in Reviews of Geophysics, v52 p243-282, 2014. The original document contains color images. |
| مصطلحات الفهرس: | Physical and Dynamic Oceanography, OCEAN MODELS, ACCURACY, ERRORS, OCEAN TIDES, TIDAL CURRENTS, IMPROVED ACCURACIES, TIDAL CURRENT ESTIMATES, TIDE MODELS, ACCURACY ASSESSMENT, PE0602435N, WU73-6777-04-5, Text |
| URL: | |
| الإتاحة: | Open access content. Open access content Approved for public release; distribution is unlimited. |
| ملاحظة: | text/html English |
| أرقام أخرى: | DTICE ADA613432 913595664 |
| المصدر المساهم: | From OAIster®, provided by the OCLC Cooperative. |
| رقم الأكسشن: | edsoai.ocn913595664 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |