[1] Although the oceans are a significant source of the greenhouse gas nitrous oxide (N 2 O) to the atmosphere, the magnitude and characteristics of this source are poorly constrained. We present here stable isotope and isotopomer (intramolecular distribution of 15

[1] We measured the intramolecular distribution of 15 N as well as conventional nitrogen and oxygen isotope ratios in oceanic nitrous oxide (N 2 O) in the western North Pacific for the first time. In contrast to a nearly homogeneous vertical distribution of a bulk nitrogen isotope ratio, a wide variation in site preference for intramolecular 15 N distribution was found, suggesting the subsurface and deep source mixing and the production mechanism in the ocean. The oceanic composition of N 2 O isotopomers quantitatively outlines the ocean as the most significant source after the terrestrial one.

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The electrodeposition of Zn-Mg alloy was investigated in a nonaqueous solution using ethylene glycol (EG) as solvent at 393 K. ZnCl 2 and MgCl 2 were used as Zn and Mg ion sources and could be dissolved in EG. Zn electrodeposits containing a certain amount of Mg were obtained in EG-ZnCl 2 -MgCl 2 baths. 8.8 mol% of Mg was coelectrodeposited with Zn in the EG-ZnCl 2 -MgCl 2 (85.0-7.5-7.5 mol%) bath at the cathodic current density of 300 Am -2 , and Mg in this specimen was electrodeposited as Zn-Mg intermetallic compound of Mg 2 Zn 11 . The red rust occurrence time of Zn-8.8 mol%Mg alloy plated steel in 5 mass% NaCl aqueous solution at 308 K was about 16.0 times longer than that of Zn plated steel.

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