The solubility of gases in distilled water and sea water—II. Oxygen

Following the N<sub>2</sub>O consumption in the oxygen minimum zone of the eastern South Pacific

“…Apparent oxygen utilization (AOU) (Murray and Riley, 1969) was estimated by subtracting in-situ O 2 concentrations from the oxygen saturation value (as a function of temperature, salinity and depth), while apparent N 2 O production (Yoshinari, 1976) was computed by subtracting the N 2 O saturation concentration (Weiss and Price, 1980) as a function of depth and temperature from the in-situ N 2 O concentration. In order to obtain the N 2 O equilibrium concentrations at every depth, the age of the water mass and then the atmospheric N 2 O concentration during the year of the water mass formation was estimated by using CFC-11 and CFC-12 concentrations from the P19 and P21 transects of WOCE, according to Fine (2011).…”

Nitrous oxide distribution and its origin in the central and eastern South Pacific Subtropical Gyre

“…Phosphate was analyzed immediately on board by the method described in Tréguer and LeCorre (1975). The Apparent O 2 Utilization (AOU) value was obtained by subtracting the measured value of the O 2 concentration from the saturation value computed for the temperature and salinity of the seawater (Murray and Riley, 1969), whereas the difference between the N 2 O saturation concentration and its measured concentration ( N 2 O) in the seawater was used to infer its production (positive) or consumption (negative) (Yoshinari, 1976). …”

Oxygen solubility in seawater: Better fitting equations

“…Green ( 196 5 and references therein) reported measurements of O2 solubility in seawater. However, Carpenter (1966) and Murray and Riley (1969) obtained more precise results, and Benson and Krause (1984) published yet more precise O2 solubility data. For limnological work, Mortimer (198 1) proposed using the results of Benson andKrause (1980), andMiller0 (1986) recommended those of Benson and Krause (1984) for oceanographic work.…”

“…These formulae do not fit the data well at temperatures below -1°C and at high salinity. Based on the experimental values of Carpenter (1966) Murray and Riley (1969), and Benson and Krause (1984), we propose a high-precision formula for estimating Co* (at STP, real gas) by the method of least-squares; it covers oceanic ranges of temperature and salinity. This new fit is well behaved in the temperature and salinity ranges of the data and it does not appear to deviate significantly at the extremes of temperature and salinity of the measurements.…”

“…This new fit is well behaved in the temperature and salinity ranges of the data and it does not appear to deviate significantly at the extremes of temperature and salinity of the measurements. We provide formulae and solubility coefficients for estimating Co* in seawater as a function of temperature and salinity in cm3 dm-3 and pmol kg-l. Weiss (1970) proposed a least-squares regression (LSR) fit for computing O2 solubility (at STP, real gas) in seawater in the range (-1 2 t 1 40°C; 0 L S 2 407~) with the experimental data of Carpenter (1966) in the range (0.5 L t 2 36°C; 5.2 L Cl L 207~) and Murray and Riley (1969) Benson and Krause (1984) made measurements of the Henry's coefficient for O2 in seawater (K,) in the range (0.2 L t 1 45°C; 0 L S L 50?&), and proposed an LSR fit with an rms deviation from the measurements of +0.08%. They expressed Co* (at STP, real gas) in mol kg-1 as a function of K, at unit standard atmospheric concentration per unit mass of seawater:…”