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Global Surface pCO2 (LDEO) Database V2008 online
The Global Surface pCO2 (LDEO) Database V2008 is now available online through
CDIAC web page:
http://cdiac.ornl.gov/oceans/LDEO_Underway_Database/LDEO_home.html

      Approximately 4.5 million measurements of surface water partial pressure
of CO2 obtained over the global oceans during 1968-2008 are listed in the
Lamont-Doherty Earth Observatory (LDEO) database, which includes open ocean
and coastal water measurements. The data assembled include only those
measured by equilibrator-CO2 analyzer systems and have been
quality-controlled based on the stability of the system performance, the
reliability of calibrations for CO2 analysis, and the internal consistency of
data. To allow re-examination of the data in the future, a number of measured
parameters relevant to pCO2 measurements are listed. The overall uncertainty
for the pCO2 values listed is estimated to be ± 2.5 uatm on the average.

         This version is referred to as Version 2008, and includes the data
collected through 31 December 2008. In this update, twenty six new
cruise/ship files are added to the previous version 2007. Dr. Nicolas Metzl
of Universite Pierre et Marie Curie, Paris, kindly called our attention to
discrepancies between his original and our data file listed in Version 2007.
The discrepancies were caused by applying temperature correction to his data
which were already corrected to SST. Affected are a total of 13,981 records
for the southern Indian Ocean in the file names OISO for years 1998 and 2000
(File Name OISO). The errors range from -29.6 μatm to + 1.3 uatm with an
average of -9.27 ± 3.43 uatm. In Version 2008, these errors are corrected,
and a total of 67,403 new OISO data spanning years 2000-2008 are added.

The documentation for the database can be found in NDP-088r which was updated
to the latest version.

Thank you,
Alex Kozyr.

*******************************************
Alex Kozyr
Carbon Dioxide Information Analysis Center
Environmental Sciences Division
Oak Ridge National Laboratory
U.S. Department of Energy
Building 1509, Mail Stop 6335
Oak Ridge, TN 37831-6335 U.S.A.

tel  1-865-576-8449
fax  1-865-574-2232

Electronic address:  kozyra@ornl.gov
Ocean CO2 WWW Page: http://cdiac.ornl.gov/oceans/home.html

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