Measurements of the total CO[sub 2] concentration and partial pressure of CO[sub 2] in seawater during WOCE expeditions in the South Pacific Ocean Page: 11 of 17
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
points at about 1300, 2800 and 5100 meters in Fig. 3-A), the mean
difference between them is less than 2 uM/kg. Fig. 3-B also shows a
comparison between the data set obtained on August 8, 1991, at Station 179
of the WOCE P-17C expedition and that obtained on November 20, 1992, at
Station 119 of this expedition at about 33oS and 135-W. The magnitude of
differences between them is similar to that observed at the previous pair
of stations. Therefore, on the bases of these observations and the
consistency with the SIO Reference Solutions, we estimate that our total
CO2 data are precise to and coherent within +2 uM/kg.
Meridional distributions of total CO2 concentration along 135.0-W
(P-17) and 150.5-W (P-16) in the South Pacific are shown in Figs. 4 and 5
respectively. In the 135.00W section, the data north of about 33-S were
obtained during our previous expedition (P-17C) in 1991 and those south of
it represent the results of the present investigation. In the 150.5-W
(P-16) section, the data south of about 33-S represent the results of this
In Fig. 4, a mid-depth CO2 maximum which is centered about 2600
meters is obser /ed. The highest concentrations exceed 2330 uM/kg in the
northern extreme (about 6-S) of the section, and decrease to about 2280
uM/kg near 48-S, where the maximum disappears. This high CO2 tongue
appears to represent the southward return-flow from the North Pacific. The
mid-depth maximum is created by the northward intrusion of denser low-CO2
Southern Ocean waters along the floor of the ocean. The CO2 concentration
in the Southern Ocean deep waters below 500 meters is nearly uniform and
ranges between 2250 and 2260 uM/kg.
In Fig. 5, the feature of the mid-depth CO2 maximum is also observed.
However, in this section along 150.5-W, the highest concentration is about
2310 uM/kg and smaller than those observed along the 135.00W section.
Furthermore, the 2300 and 2310 uM/kg contours are closed both to the north
and south in the 150.5-W section, whereas they are open to the north in the
135.0-W section. These differences may be attributed to the presence of a
large topographic high, the Tuamotu Archipelago, located 15-S-25oS and
130-W-150-W, which diverted the southward flow of the high CO2 water.
Fig. 6-A shows the distribution of eight properties observed in
surface waters along the 135.0-W meridian between 31-S and 63 S during the
present investigation aboard the R/V Knorr in October-November, 1992. Fig.
6-B shows the same properties observed during our previous expedition in
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Takahashi, T.; Goddard, J. G.; Chipman, D. W. & Rubin, S. I. Measurements of the total CO[sub 2] concentration and partial pressure of CO[sub 2] in seawater during WOCE expeditions in the South Pacific Ocean, report, June 29, 1993; Palisades, New York. (https://digital.library.unt.edu/ark:/67531/metadc1104686/m1/11/: accessed May 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.