부산대학교 도서관

We report on the 15N/14N and 18O/16O ratio analysis of nitrate in accumulated winter snowpack and fresh spring snow collected near Ny lesund, Svalbard (79°N), in the early summers of 2001–2003. The presence of contaminant organic matter in the silver nitrate prepared for analysis must be carefully monitored to assess its effects on , and particularly results. values ranged to (versus air ) and values +60 to + (versus VSMOW). The values are in the reported range for atmospheric nitrate in other parts of the globe, and will tend to reflect the relationship between oxygen and in the troposphere immediately prior to nitrate deposition. values, however, are lower than those for atmospheric nitrate over most parts of the globe, but show similarities to 15N/14N ratios reported for atmospheric nitrate in the Antarctic. We discuss mechanisms for producing 15N-depleted nitrate in the troposphere, or the possibility that it reflects nitrogen derived from the stratosphere. [Copyright &y& Elsevier]