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INTERGOVERNMENTAL OCEANOGRAPHIC COMMISSION (OF UNESCO) ___________WORLD METEOROLOGICAL ORGANIZATION _____________JCOMM Observations
Coordination Group (OCG)
Fifth SESSION
Silver Spring, USA
5-7 SEPTEMBER 2013 FORMTEXT OCG-5/ Doc. 2.1
(14-Aug-2013)
_______
ITEM: 2.1
ENGLISH ONLY
JCOMM-GOOS-IODE Data Flow Architecture Assessment
(Submitted by Robert Keeley)
Summary and purpose of the document
This document provides information on the JCOMM-GOOS-IODE data flow architecture assessment being conducted by consultant Robert Keeley.
ACTION PROPOSED
The Group will review the information contained in this report and comment and make decisions or recommendations as appropriate.
_______________
JCOMM-GOOS-IODE Data Flow Architecture Assessment
Objective
In May 2013, the JCOMM Management Committee discussed data flow. An excerpt of the report:
In view of multiple programmes engaged in data management activities and the need to ensure flow from observations through data management into science and services, the Committee also noted the combined JCOMM-GOOS-IODE effort to improve interoperability and consistent data management for all OCG observing networks, including real-time, quality control, metadata collection, and climate quality archive issues. Bob Keeley (Canada) is assessing the current system and will make recommendations by the end of 2013, taking into account existing community data architecture.
Methods
The prime focus of the work is real-time data systems coordinated by The Observations Programme Area of JCOMM and related programmes. However, since data in both real-time and delayed mode contribute to climate archives, some consideration must be paid to other contributions from internationally governed as well as disparate ocean data collection programmes. The work considers the degree of accessibility of data and recognizes constraints there may be on access. It is an assessment of the data management systems largely, though information about instruments and sampling strategies are recorded.
In compiling this report, I am using a number of sources. A primary source has been documents available from JCOMM, IODE and Observing system websites. The documents consulted are meeting reports, meeting documents, monitoring information, etc. As well, individuals associated with the programmes under consideration have been consulted. References and links are provided so that a reader can follow up if more details are wanted.
By Observing System
To provide consistency in this report, information on each of the programmes is divided into discussions of data providers, data assembly, processing and archiving, dissemination. Within each of these categories a set of attributes to investigate and describe has been created derived from the four documents concerning data management presented at the OceanObs'09 conference held in Venice in 2009.
After this is summary of the differences between the data set that are available, a short discussion of user communities, monitoring and performance metrics, and comments about the observing programme relative to GCOS-IP Actions. Recommendations relevant to the specific observing programme are then presented.
The observing programmes treated are SOT (VOS, SOOP, TSG), DBCP (surface drifters, TIP, OceanSITES), GLOSS, Argo. GO-SHIP and IOCCP.
By ECV
I was also asked to review observing systems from the perspective of how well objectives for observing ECVs are met. ECVs, rather than EOVs, were chosen for 2 reasons. First, a comprehensive list of these exists, whereas no such list exists for EOVs. No doubt, many if not all of the ECVs will also appear as EOVs. Second, the WMO has a database, called OSCRA, with a comprehensive set of requirements for each ECV and application area. I under stand that there are some reservations about the suitability of some of the criteria that appear, but at least the list is clear.
The discussions of each EOV, about 18 in all, first reviews instrument characteristics, since measurement differences between instruments for a single ECV impacts how the data may be combined in analyses. I then review characteristics of the observing systems for the ECV, including references to routine observation programmes outside of JCOMM. Next comes a statement about the Framework on Ocean Observations and the readiness Levels discussed. Only the data management part is included. Next is presentation of the OSCAR requirements by application area for the ECV. It should be noted that a few odd entries were found that should be checked. I make a qualitative assessment of whether or not the composite of all observing systems meet the 5 criteria in OSCAR. This is qualitative because of the different sampling strategies for each observing programme and different instruments used. Kent, et. al. have described a method for a quantitative way to assess this, and one recommendation I have is for an appropriate group or individual to undertake similar assessments for other ECVs where this is sensible to do.
It struck me that the way the OSCAR database is built, it focuses on uniform spacial coverage. This is an issue for oceanography in that for many variables, the resources are just not available or come close to such coverage. Oceanographers sample on sections and at reference sites. With proper choice of these, it is expected that conclusions drawn from these are applicable more widely. This perspective is not well represented in OSCAR, and perhaps OOPC needs to figure out how to address this so that more realistic sampling objectives can be set for EOVs.
The final comment is to use the data management column of the FOO Readiness Level table to provide my overall impression of where the composite observing system sits.
Summary
The report wraps up with a set of more global recommendations. These include such things as the need for each observing system to provide better information, perhaps just easier to find, on the variables they collect, how the data are assembled, and so on. It was also quite clear that not enough is being done to ensure documentation of instruments and measurement uncertainty/accuracy is being recorded with observations. Data processing methods are not well described in all cases, and this means a data user does not know what has been done to the data and therefore what built in features of the data may impact intended analyses.
It is also clear that it is not a simple matter to go to a JCOMM programme website and easily find out what variables are collected and available. In fact it is easier for some programmes than others. But some readily obvious table on each home page would be very convenient.
Programmes such as TIP, OceanSITES, IOCCP point potential users to a variety of component sites or Action Groups. This is expedient, but it makes it harder for some trying to get an overview of just what each does and what they contribute. It can leave an impression that the programme is just a convenient umbrella rather than one that is well coordinated.
Other comments crafted as recommendations to be considered will be drafted and will act as a summary for the report.
All of the writing of the report will be completed by the end of September. The report will need to be reviewed, certainly to correct factual errors or mis-statements. How this is to be done is still undecided (as of mid August). I will then take comments, modify text appropriately and deliver the final version as soon as possible after reviews are completed. A target of the end of 2013 still appears to be in reach.
_______________
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