Oceanic Particulate Inorganic Carbon as an Estimate of Calcification Measured during the JGOFS Equatorial Pacific Process Study (EQPAC)Entry ID: JGOFS_EQPAC_PIC
Abstract: The Equatorial Pacific Process Study (EQPAC) was conducted along 140 deg W
longitude during 1992.
Four cruises took place: February 3 - March 9, March 19 - April 15,
August 5 - September 18, and September 24 - October 21. A fifth benthic
cruise and sediment trap legs were added. During the first cruise
(TT007), 15 stations ... were occupied along 140 deg W longitude from
12 deg N latitude to 12 deg S latitude. During the second cruise
(TT008), data were collected at 8 stations along 140 deg W longitude
from 9 deg S latitude to 9 deg N latitude. During the third cruise
(TT011), data were collected at 15 stations along 140 deg W from 12 deg N
latitude to 12 deg S latitude. During the fourth cruise (TT012), data were
collected at 5 stations along 140 deg W longitude from 17 deg S
latitude to the equator.
During the third cruise (TT011), calcification (calcite
production) was measured at each site using carbon-14 techniques.
Particulate inorganic carbon (PIC) was used as an estimate of calcite.
Water was collected using the trace metal (TM) clean rosette,
inoculated with carbon-14 solution, incubated for 24 hours in situ,
split into two aliquots, and filtered. The replicate filters were
fumed in the presence of concentrated HCl to drive off activity due
to calcite. Radioactivity on the filters was measured in a liquid
scintillation counter. Calcification rates were calculated based on
the difference between unfumed filter counts and fumed filter counts.
In addition, primary production, chlorophyll, and phaeopigments were
The data is public domain and can be retrieved on-line at
[The information in this summary was taken from the JGOFS
World Wide Web pages.]
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Start Date: 1992-08-05Stop Date: 1992-09-18
Quality ATTRIBUTE ACCURACY REPORT: Not provided
LOGICAL CONSISTENCY REPORT: Unknown
COMPLETENESS REPORT: Completeness information not available.
PROCESS DESCRIPTION: Unknown
PROCESS DATE: Unknown
Access Constraints ACCESS CONSTRAINTS: None
DISTRIBUTION LIABILITY: Every effort has been made to ensure that these data are accurate and reliable within the limits of current NOAA quality control procedures. NOAA can only certify that the data provided to its customers is an authentic copy of the records which were accepted for inclusion in NOAA archives. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Use Constraints None
Data Set Progress
Role: DIF AUTHOR
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Postal Code: 28801-5001
Creation and Review Dates
DIF Creation Date: 2006-06-27
Last DIF Revision Date: 2009-04-20