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Some Challenges and Advances in Regional Ocean Data Assimilation
| Content Provider | Semantic Scholar |
|---|---|
| Author | Moore, Andrew M. T. |
| Copyright Year | 2012 |
| Abstract | Since the early attempts at ocean data assimilation in the 1980’s (e.g. Robinson and Leslie, 1985; Moore et al, 1987) the field has matured considerably, and a diverse array of ocean data assimilation systems now exist. Global ocean data assimilation efforts have been propelled in part by the coordinated efforts of the Global Ocean Data Assimilation Experiment (GODAE), the growing need for seasonal forecasts, as well as growing concerns over climate change. There are a growing number of groups producing global ocean analyses of the circulation of the past (see for example http://www.godae.org/Ocean-products.html). In addition, some operational centres routinely generate analyses for current conditions. Global ocean data assimilation, however, presents a considerable challenge because of the size of the inverse problem involved, so the resolution (horizontal and vertical) of global assimilation products is often limited. The highest resolution products currently available are performed on grids with horizontal grid-spacing typically ~1/4-1/6 degree, so the effective resolutions are 2-3 times lower than this, which is marginal for resolving much of the important mesoscale variability in the open ocean, and certainly inadequate for capturing important circulation features of the coastal regions. For this reason, there has also been a push to develop regional ocean data assimilation systems which utilize higher resolution grids. Two approaches to regional ocean data assimilation are typically used: either the regional model is nested within a global data assimilating model, or the regional model is run stand-alone and boundary condition information is provided by a global assimilating model. While there are clear advantages and disadvantages to both approaches, the stand-alone approach offers greater flexibility since the analyses can be produced using a variety of global circulation estimates as boundary conditions, thus providing a range of uncertainty estimates. Some current regional ocean data assimilation efforts can also be found at http://www.godae.org/Ocean-products.html. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.ecmwf.int/sites/default/files/elibrary/2012/11231-some-challenges-and-advances-regional-ocean-data-assimilation.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
