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Surface Marine DataInternational Comprehensive Ocean-Atmosphere Data Set
(ICOADS)
Steven Worley, NCAR
Scott Woodruff, NOAA/ERSL
Eric Freeman, NOAA/NCDC
Joey Comeaux, NCAR
NOAA-Roshydromet Bilateral Program, NCDC, 30 Nov. – 1 Dec. 2011 2
Topics
ICOADS Release 2.5 Russian Contributions Data analysis and QC Opportunity for Collaboration Development of Bias-free Global Marine Data
NOAA-Roshydromet Bilateral Program, NCDC, 30 Nov. – 1 Dec. 2011 3
ICOADS Release 2.5
Complete in 2009 Period 1662-2007 Many new data sources added
Near-real-time, based on GTS 2008 – October 2011
Project web portal: http://icoads.noaa.gov/
Woodruff, S.D., S.J. Worley, S.J. Lubker, Z. Ji, J.E. Freeman, D.I. Berry, P. Brohan, E.C. Kent, R.W. Reynolds, S.R. Smith, and C. Wilkinson, 2011: ICOADS Release 2.5: Extensions and Enhancements to Sfc Marine Met. Archive. Int. J. Climatol., 31, 951-967.
Data Exchange:• NCAR prepared a TB drive with ICOADS archive• All observations and monthly summaries• All documentation and software
Recent marine platform mixture Voluntary Observing Ships (VOS) Drifting and moored buoys, and other marine platform types Plus VOS metadata (with help from UK NOCS)
WMO Pub. 47 VOS metadata 1966-2007
MORMET Archive25 million records, delivered 1989-1991Period, 1888-1990
Russian R/V Digitization Project Alex, Svetlana, Vera @ RIHMIPeriod, 1936 – 2000 (met. and actinometric data)2 million records
Major Russian Contribution to ICOADS
Data Analysis and QCWorld Ocean Database 2009 Air Temperature
Unrealistic distribution of Air Temperature Anticipating a correction from NODC
Data work takes time and is constantly challenging!
Realistic distribution of AT with latitude from WOD
Error in one component of WOD
Data Analysis and QC - ImpactFrom:Kennedy, J.J., N.A. Rayner, R.O. Smith, D.E. Parker, and M. Saunby (2011), Reassessing biases and other uncertainties in sea surface temperature observations measured in situ since 1850: 2. Biases and homogenization, J. Geophys. Res., 116, D14104 (doi:10.1029/2010JD015220) [http://www.agu.org/pubs/crossref/2011/2010JD015220.shtml].
“A manual scan of the data was performed after gridding the observations at monthly 1 degree latitude by 1 degree longitude resolution. Some observations from deck 732 between 1958 and 1974 were identified as being incorrectly located. A number of these areas were identified …... Seventeen 5-degree areas or blocks of 5-degree areas were obviously artificially warm or cold relative to neighboring areas and relative to other observations within the areas. Data from deck 732 were not used from the areas specified in Table 1 at the times specified in Table 2.”
NOAA-Roshydromet Bilateral Program, NCDC, 30 Nov. – 1 Dec. 2011 12
Opportunity for Collaboration
NCAR Visiting Scientist Program Host a Russian Scientist or Data Technician at NCAR
Purpose: Analyze and Improve Quality of MORMET Results:
New high quality MORMET for ICOADS New version of MORMET for RIHMI
NCAR Provides Living expenses, 2-3 Months Office and Computing Support Work within Data Support Section at NCAR
Need written work plan and approval from NCAR management
ICOADS Release 2.6.0, Date: October 2012
Data preparation cutoff approx. April 2012 ICOADS IMMA data format improvements
Including UID on each record New attachments:
Physical oceanography – near-surface T&S Value-added, bias adjustments Platform tracking Historical data, e.g. Beaufort wind force/Wx
codes Reanalysis feedbacks
Development of Bias-free Global Marine Data
Development of Bias-free Global Marine Data
ICOADS Value-Added Database (IVAD) http://icoads.noaa.gov/ivad/
Project aim: to trace value-added improvements back to individual ICOADS observations
How: Establish a DBMS to support development of value-added
records and facilitate user access Implement modifications to the International Maritime
Meteorological Archive (IMMA) data format Scientifically demonstrate the impact of value-added
records on air-sea flux estimates
New ProjectPartners: NCAR, NOAA (ESRL, NCDC), Florida State University
Development of Bias-free Global Marine Data
IVAD Process International partners/contributors assess and
determine bias adjustments Adjustments are submitted to the IVAD team Linkage is through the UID Adjustment added to the records in the DBMS User Access
1. Through interface get original and adjusted values
2. Version controlled IMMA data file are systematically output
Conclusions
ICOADS remains the global marine surface reference dataset Russian partners have the newest version Russian partners have contributed important
observations
There is an opportunity to do U.S./Russia collaborative data quality work at NCAR
Through the IVAD project ICOADS is advancing toward a bias-free global marine dataset