摘要
THK N<sub>2</sub>O is an important greenhouse gas. In the steady state the stable isotopic composition of nitrogenand oxygen in tropospheric N<sub>2</sub>O is balanced by isotopically light N<sub>2</sub>O emitted from soils and oceans andisotopically heavy N<sub>2</sub>O as return flux from the stratosphere. However, no such balance was reached incalculations given by Kim and Craig. This serious discrepancy lied in the fact that only soil and oceanic sources were considered in Kim and Craig’s calculation and N<sub>2</sub>O emission from tropical forest soil wastaken as the global soil contribution. Progress since the 1990s in identifying additional sources of atmospheric N<sub>2</sub>O as well as in the estimation from various types of soil allows us to make more realistic assessment of nitrogen and oxygen isotope balance budgets in tropospheric N<sub>2</sub>O. In this note, modification willbe proposed of atmospheric N<sub>2</sub>O nitrogen and oxygen isotope budgets to Kim and Craig’s calculation. The static balance of nitrogen and oxygen isotopes in tropospheric N<sub>2</sub>O is expressed
