Functional Components of GODAE
The scope and international nature of GODAE involves distributed data assembly and serving, a variety of assimilation products, distributed product serving and archiving, and a multiplicity of application centres.
- NWP (Numerical Weather Prediction) centres
- Telecommunications and data assembly centres
- Measurement networks (in situ and remotely sensed)
- Data servers
- Modelling and assimilation groups or centres
- Product servers and delivery systems
- Computational resources
- Application centres or service providers
The relations between these components are not one-way. In fact, the communications and feedback between them is one of the crucial concepts of GODAE. For example, the goal of generating useful products requires interactions between providers and users in both design and assessment of the products. The organisation of and connections between the GODAE functional components are shown below:
NWP (Numerical Weather Prediction)
Several GODAE activities will rely on products from NWP centers. GODAE groups seek specialized surface wind vector analyses in order to preserve the full detail provided by scatterometry. Radiative flux products may also be derived directly. However, GODAE researchers recognise that forcing fields for short-range ocean forecasts must come from NWP forecasts.
Data Assembly Centres
Data assembly is a critical stage in the life of data, checking their health (quality) and providing order and consolidation in the data sets. For the purposes of GODAE, three classes of data assembly can be distinguished
(a) The first class involves "assembly" of Level 1 data into Level 2a data sets (see data definitions), with little value adding. Operational data holdings at, e.g. BMRC and the Met Office, based on the GTS, are typical. There may be some rudimentary quality checks.
(b) The next class involves some orderly assembly to ensure the data sets are more coherent and integrated (self-consistent). Though this assembly will often be by data type/platform, in some cases there may be merging of data from different sources. The MEDS GTSPP data might be an example. For our purposes, we will denote this as Level 2b data.
(c) In the final category there is non-trivial scientific input, e.g. delayed mode altimetry data with orbit corrections, scientific quality controlled UOT data, etc.: Level 2c
There will be several types of data assembly centres.
- Specialist (one field, e.g. SST)
- Real time, mostly with fully-automated procedures
- Delayed mode, usually involving scientific and/or technical input
- Consolidation (broader than one field and/or platform)
This includes the whole range of observation system facilities and devices, from tide gauges to satellite observations, from gliders to Argo floats. Delivery of effective ocean products and services requires sustained access to global data of known quality.
GODAE Data Servers
Facilities that provide processed oceanographic data via the internet. To ensure reliable, identifiable data flow to the Assimilation Centers and groups, GODAE-specific data servers have been established.
GODAE Data Assimilation Centres
Centres that will focus on the synthesis of the data with the ocean models.
GODAE Product Servers
Facility that provides 'operational' global, high-resolution nowcast and short-range forecast fields and global, consistent analyses for climate applications to a variety of users in an openly accessible system.
a. Service provider centres (who already have close links to end-users) which use GODAE products in their services to end-users
b. Research communities currently developing their own assimilation products for particular applications, such as in the coastal ocean.
Mid-level or intermediate users, who will enhance and emboss GODAE products for specific end users.
(Last Updated: 16-10-2007)