an introduction to the argo data sytem south pacific workshop 11 – 14 october 2005 mark...
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An Introduction to the Argo Data Sytem
South Pacific Workshop
11 – 14 October 2005
Mark Ignaszewski
FNMOC
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South Pacific Workshop 11-14 October 2005
Outline
• Data system features
• Data system overview
• Available data
• Data access
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South Pacific Workshop 11-14 October 2005
Argo: A global collaboration
• Participating countries: 20– Principle investigators: over 30
• National data centers: 9• Float manufacturers: 6
Goal of the data system• Provide a globally consistent data set• Freely and easily available• Meet the needs of the operational (real-time) and
research communities
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South Pacific Workshop 11-14 October 2005
Data Consistency
• Data are distributed in controlled formats– GTS data are in the TESAC code form– Server data are in standardized netCDF files
• File format and data consistency are checked for every file before distribution
• Standardized quality control procedures are used by all data providers
• Meta-data for each float must be available before data for the float can be distributed
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South Pacific Workshop 11-14 October 2005
Data Availability
• Data is distributed on the GTS for operational centers
• Two global data servers– One in France, the other in the US– Both servers offer open access to all data via
• FTP
• Web interfaces
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South Pacific Workshop 11-14 October 2005
Communities Served
Operational (real-time) community• Standard automated QC checks detect and flag bad data• Data available on GTS and on the global servers• Data are distributed within 24 hours of observation
Research community• Standardized delayed-mode QC techniques have been
developed to calibrate Argo data (primarily salinity)– data are available 6 months to 1 year after observation
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South Pacific Workshop 11-14 October 2005
Data System Schematic
UsersUsers
Global ArgoData Repository
ArgoInformation
Center
Data Assembly Centers
ArgoInformationGlobal
Data Assembly Centers
PrincipleInvestigators
Regional Data Assembly Centers
GTS
< 24 hrs
< 24 hrs
< 24 hrs
Within hours
6 months -1 year
> 1 year
AIC• Notify coastal states of floats that might enter their EEZ• Clearinghouse for Argo information
www.argo.net• Encourage participation by new countries• Provide international coordination
DACs• Receive data from floats• Apply standardized automated QC checks• Insert data on the GTS• Submit data to the GDACs• Within 24 hours of observation
• 9 DACs (currently)
• Archive raw data
RDACs• Build high-quality reference datasets for their regions from all available data
• for use in delayed-mode QC process• Perform basin-scale delayed-mode QC
• Produce regional products based on Argo dataPIs
• Retrieve data from DACs• Perform standardized delayed-mode QC• Send delayed-mode data to the DACs
GDACs• Validate data format and consistency• Provide ftp and Web access to ALL users
• 2 Global data centers (synchronized)
Official source of Argo data
GADR• Permanently archive Argo data• “Register” data with data inventories• Provide data on hardcopy media for distribution• Provide data transformation and integration tools• NODC
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South Pacific Workshop 11-14 October 2005
Argo Data Coverage
1 – 30 September 2005:
5981 Argo observations2031 Active floats
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South Pacific Workshop 11-14 October 2005
Combined Data Coverage
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South Pacific Workshop 11-14 October 2005
Data: By Year
0
10000
20000
30000
40000
50000
60000
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
Year
Ob
se
rva
tio
ns
Delayed-mode
Real-time
Total Observations: 181,345Delayed-mode QC: 24,769
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South Pacific Workshop 11-14 October 2005
Data Access: FTP
• US GDAC: ftp://usgodae1.fnmoc.navy.mil/pub/outgoing/argo
• French GDAC: ftp://ftp.ifremer.fr/ifremer/argo
• Index files: “Index” of all files on the GDAC – text files– Includes additional information for easy searching (positions, times, etc)
• 3 “views”– DAC view: float files as provided by the DACs (“dac” directory)
– Geographic view: files arranged by basin (Atlantic, Pacific, Indian) and day of observation (“geo” directory)
– Latest-data view: files arranged by day of receipt at the GDAC (“latest_data” directory)
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South Pacific Workshop 11-14 October 2005
French GDACwww.coriolis.eu.org//cdc/argo.htm
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South Pacific Workshop 11-14 October 2005
French GDACwww.coriolis.eu.org//cdc/argo.htm
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South Pacific Workshop 11-14 October 2005
French GDAC: Data Selection Tool
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South Pacific Workshop 11-14 October 2005
French GDACwww.coriolis.eu.org//cdc/argo.htm
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South Pacific Workshop 11-14 October 2005
US GDAC: Web interfacewww.usgodae.org/argo/argo.html
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South Pacific Workshop 11-14 October 2005
US GDAC: Argo Data Browser
www.usgodae.org/argo/argo.html
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South Pacific Workshop 11-14 October 2005
US GDAC: Argo Data Browserwww.usgodae.org/argo/argo.html
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South Pacific Workshop 11-14 October 2005
US GDAC: OPeNDAP
OPeNDAP Functionality• Export to binary or
ASCII• Subset• Subsample• Browse
www.usgodae.org/argo/argo.html
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South Pacific Workshop 11-14 October 2005
US GDAC: LAS
• Select profile data by:• Time Period• Region• Depth Range
• Additionally constrain by• Float ID• DAC• Real-Time/Delayed
Mode• QC Values
www.usgodae.org/argo/argo.html
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South Pacific Workshop 11-14 October 2005
US GDAC: LAS
LAS
Gaussian
Metadata
Pie
Waterfall
Comma Separated
HTML Text
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South Pacific Workshop 11-14 October 2005
Important Addresses
• AIC Entry Page: www.argo.net
• Argo Project Office: www.argo.ucsd.edu• Argo Information Center: argo.jcommops.org
• French GDAC: www.coriolis.eu.org/cdc/argo.htm• US GDAC: www.usgodae.org/argo/argo.html
• Data Guide: www.coriolis.eu.org/cdc/argo/example/Argo_data_guide.pdf
Please Provide Feedback!
• Argo mailing list service: listes.cls.fr/wws/info/argo