Data Summary

Eight ASCII text files are provided including this documentation file (ndp029.txt), one fortran (ndp029.for) and three SAS (ndp029w.sas, ndp029e.sas, and ndp029n.sas) retrieval programs to read and print the data files containing carbonate data obtained from 3 different cruises (2 NOAA CO₂ dynamics cruises, and the Norpax Hawaii-Tahiti Shuttle Experiment) of the North Pacific Ocean. The number of stations occupied and the carbonate data available vary for each cruise.

NDP029E.DAT - EASTERN NORTH PACIFIC

Alkalinity, calcium, pH, salinity, and water temperature values are provided from NOAA's CO₂ Dynamics Cruise of the Eastern North Pacific aboard the R/V Miller Freeman. The ship departed Kodiak, Alaska on June 14, 1981, and arrived at Hilo, Hawaii, on July 4th after occupying nine stations along the 150 ° W vertical transect. After reaching the southernmost point of the cruse tract (8° N), the R/V Miller Freeman occupied seven stations while returning to Seattle, Washington. Data from all sixteen stations are provided.

Alkalinity was determined using the method of Culberson et al., (1970) at 25 ±0.02°C. Calcium samples were stored and brought back to Oregon State University where determinations were made using the method of Tsunogai et al., (1968) and Olson and Chen (1981). Measurements for pH were done at 25 ±0.02°C using a combination electrode.

NDP029W.DAT - WESTERN NORTH PACIFIC

The second source of data, NOAA's CO₂ Dynamics Cruise in the Western North Pacific aboard R/V Discoverer, departed Kwajalein, Alaska, on May 27, 1982, and arrived at Adak, Alaska, on the 29th of June. During the cruise, ten stations were occupied with all roughly along the 165° E vertical transect. Total alkalinity and pH measurements were determined at 25 ±0.02° C using a radiometer TTT61 digital titrator and a combination electrode, respectively.

NDP029N.DAT

For the Norpax Hawaii-Tahiti Shuttle Experiment, samples were collected during legs 3 (April 1979) and 13 (March-April 1980). Alkalinity was determined using the method of Culberson et al., (1970), Calcium was measured using the method of Tsunogai et al., (1968) and Olson and Chen (1981), and salinities were determined using an autosal inductive salinometer.

Based on these data, Chen et al., (1986) concluded that overall the North Pacific Ocean contains 14.7 ± 4 X 10¹⁵ g excess carbon and that the deep water of the eastern North Pacific is older than that of the western North Pacific. They also estimated that about a 25% increase in total inorganic CO₂ of deep water, after leaving the Southern Ocean surface, is contributed by inorganic CACO₃ dissolution.

The header information and carbonate chemistry data from NOAA's CO₂ Dynamics Cruise of the eastern North Pacific Ocean (NDP029E.DAT) including; sample depth (DEPTH), water temperature (TEMP), salinity (SALIN), concurrent pH (PH), total alkalinity (TOTALK), and normalized calcium (NCA) are formatted as follows:

       READ(UNIT,10) STANUM,LATDEG,LATMIN,LATTEN,HEMLAT,LONDEG,                 
     1  LONMIN,LONTEN,HEMLON,DATE                                               
 10    FORMAT(2A3,1X,I2,1X,I2,2X,I1,A1,2X,I3,1X,I2,2X,I1,A1,1X,2A4,/)           
       READ(UNIT,20,END=99) DEPTH,TEMP,SALIN,PH,TOTALK,NCA                      
 20    FORMAT(1X,I4,2X,F5.2,3X,F6.3,3X,F5.3,3X,I4,3X,I5)                        

For this data file, there are 208 water temperature and salinity values, 126 pH readings, 207 total alkalinity esitmates, and 197 calcium measurements. These data have been colledted at 16 stations and from sample depths ranging from the surface to 2767 meters in depth. All missing values are represented in the data file as a blank field.

The header information and carbonate chemistry data from NOAA's CO₂ Dynamics Cruise of the western North Pacific Ocean (NDP029W.dat) including; sample depth (DEPTH), water temperature (TEMP), salinity (SALIN), concurrent pH (PH), total alkalinity (TOTALK), and normalized calcium (NCA) are formatted as follows:

       READ(UNIT,110) STANUM,LATDEG,LATMIN,LATTEN,HEMLAT,LONDEG,                
     1  LONMIN,LONTEN,HEMLON,DATE                                               
110    FORMAT(2A3,1X,I2,1X,I2,2X,I1,A1,2X,I3,1X,I2,2X,I1,A1,1X,2A4,/)           
       READ(UNIT,120,END=199) DEPTH,TEMP,SALIN,PH,TOTALK                        
 20    FORMAT(1X,I4,2X,F5.2,3X,F6.3,3X,F5.3,3X,I4)                              

For this data file, there are 199 water temperature, salinity, and pH values, and 197 total alkalinity estimates. These data have been collected at 10 stations and from sample depths ranging from the surface to 3038 meters in depth. All missing values are represented in the data file as a blank field.

The header information and carbonate chemistry data from legs 3 and 13 of the Norpax Hawaii-Tahiti Shuttle Experiment in the north Pacific Ocean (NDP029N.DAT) including; sample depth (DEPTH), water temperature (TEMP), salinity (SALIN), normalized calcium (NCA), total alkalinity (TOTALK), and duplicate calcium analyses (NCAREP) are formatted as follows:

      READ(UNIT,210) STATN,LEG,NUM,LAT,LONG,DATE                                
210   FORMAT(2A4,I2,1X,I2,1X,2A3,1X,2A3,1X,2A4,/)                               
      READ(UNIT,220,END=299) DEPTH,TEMP,SALIN,NCA,TOTALK,NCAREP                 
220   FORMAT(1X,I4,2X,F5.2,3X,F6.3,3X,I5,3X,I4,3X,I5)                           

For this data file, there are 171 water temperature and salinity values, 160 total alkalinity estimates, 164 calcium measurements, and 12 duplicate calcium analyses. These data have been collected at 15 stations and from sample depths ranging from 2 meters to 1021 meters in depth. All missing values are represented in the data file as a blank field.