2024-03-28T21:22:38Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1700372019-07-31T00:57:10Zcom_10261_47com_10261_8col_10261_678
2018-09-21T11:32:05Z
urn:hdl:10261/170037
Carbon dioxide, Hydrographic and chemical data obtained during the R/V Maurice Ewing cruise in the Atlantic Ocean (WOCE section A17, 4 January – 21 March 1994)
Ríos, Aida F.
Johnson, K. M.
Álvarez-Salgado, Xosé Antón
Arlen, L.
Billant, A.
Bingler, L. S.
Branellec, Pierre
Castro, Carmen G.
Chipman, D. W.
Wallace, D. W. R.
Carbon dioxide, TCO2
Total alkalinity
pH, partial pressure of CO2
Carbon cycle
Coulometry
Potentiometry
Hydrographic measurements
World Ocean Circulation Experiment
Meridional section
South Atlantic Ocean
27 pages, 8 tables, 6 figures
This documentation discusses the procedures and methods used to measure total carbon dioxide
(TCO2), total alkalinity (TALK), and pH at hydrographic stations during the R/V Maurice Ewing cruise in
the South Atlantic Ocean on the A17 WOCE section. Conducted as part of the World Ocean Circulation
Experiment (WOCE), this cruise was also a part of the French WOCE program consisting of three
expeditions (CITHER 1, 2, and 3) focused on the South Atlantic Ocean. The A17 section was occupied
during the CITHER 2 expedition, which began in Montevideo, Uruguay, on January 4, 1994 and finished
in Cayenne, French Guyana, on March 21, 1994. During this period the ship stopped in Salvador de Bahia
and Recife, Brazil, to take on supplies and exchange personnel. Upon completion of the cruise the ship
transited to Fort de France, Martinique. Instructions for accessing the data are provided.
TCO2 was measured using a single-operator multiparameter metabolic analyzer (SOMMA) coupled
to a coulometer for extracting and detecting CO2 from seawater samples. The overall precision and
accuracy of the TCO2 analyses was ±1.6 μmol/kg. A second carbon system variable, TALK, was
determined by potentiometric titration with an overall precision of ±1.7 μmol/kg. During the A17 cruise
the carbon system was overdetermined because a third carbonate system variable, pH, was also measured
potentiometrically with an overall precision of ±0.003. The underway partial pressure of CO2 (pCO2) in
surface waters was also continuously measured along the cruise track.
A comparison of A17 TALK with recent data in the South Atlantic Ocean confirms that A17 TALK
data need a downward correction of 8 μmol/kg that was integrated in the CDIAC database. The internal
consistency study carried out among the four carbon system variables led us to adjust the pH
measurements by stations in order to eliminate the difference between TCO2 measured and TCO2
calculated from pH and TALK.
The R/V Maurice Ewing A17 data set is available free of charge as a numeric data package (NDP)
from the Carbon Dioxide Information Analysis Center. The NDP consists of three oceanographic data
files, one FORTRAN 77 data retrieval routine file, and this printed documentation, which describes the
contents and format of all files as well as the procedures and methods used to obtain the data
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2018-09-21T11:32:05Z
2005
informe técnico
http://hdl.handle.net/10261/170037
eng
Sí
openAccess
Carbon dioxide Information Analysis Center