Earth System Science Data
www.earth-syst-sci-data.net
1866-3508
1866-3516
2
1
2010
10.5194/essd-2-133-2010
http://www.earth-syst-sci-data.net/2/133/2010/
http://www.earth-syst-sci-data.net/2/133/2010/essd-2-133-2010.html
http://www.earth-syst-sci-data.net/2/133/2010/essd-2-133-2010.pdf
133
155
2010-05-11
CARINA data synthesis project: pH data scale unification and cruise adjustments
A. Velo
avelo@iim.csic.es
F. F. Pérez
X. Lin
R. M. Key
T. Tanhua
M. de la Paz
A. Olsen
S. van Heuven
S. Jutterström
A. F. Ríos
Instituto de Investigaciones Marinas, CSIC, Eduardo Cabello, 6, 36208 Vigo, Spain
Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, NJ, USA
Leibniz-Institute für Meereswissenschaften, Marine Biogeochemie, Kiel, Germany
Netherlands Institute for Sea Research, Texel, The Netherlands
Institutionen för kemi, Göteborgs universitet, Göteborg, Sweden
Bjerknes Centre for Climate Research, UNIFOB AS, Allégaten 55, 5007 Bergen, Norway
Data on carbon and carbon-relevant hydrographic and hydrochemical parameters
from 188 previously non-publicly available cruise data sets in the Artic
Mediterranean Seas (AMS), Atlantic Ocean and Southern Ocean have been
retrieved and merged to a new database: CARINA (CARbon IN the Atlantic
Ocean).
<br><br>
These data have gone through rigorous quality control (QC) procedures to
assure the highest possible quality and consistency. The data for most of
the measured parameters in the CARINA database were objectively examined in
order to quantify systematic differences in the reported values. Systematic
biases found in the data have been corrected in the data products, three
merged data files with measured, calculated and interpolated data for each
of the three CARINA regions; AMS, Atlantic Ocean and Southern Ocean. Out of
a total of 188 cruise entries in the CARINA database, 59 reported pH
measured values. All reported pH data have been unified to the Sea-Water
Scale (SWS) at 25 °C.
<br><br>
Here we present details of the secondary QC of pH in the CARINA database and
the scale unification to SWS at 25 °C. The pH scale has been converted
for 36 cruises. Procedures of quality control, including crossover analysis
between cruises and inversion analysis are described. Adjustments were
applied to the pH values for 21 of the cruises in the CARINA dataset. With
these adjustments the CARINA database is consistent both internally as well
as with the GLODAP data, an oceanographic data set based on the World
Hydrographic Program in the 1990s. Based on our analysis we estimate the
internal consistency of the CARINA pH data to be 0.005 pH units. The CARINA
data are now suitable for accurate assessments of, for example, oceanic
carbon inventories and uptake rates, for ocean acidification assessment and
for model validation.
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