Temporal variations of the atmospheric nitrous oxide concentration and its δ15N and δ18O for the latter half of the 20th century reconstructed from firn air analyses
Temporal variations of the atmospheric nitrous oxide concentration and its δ15N and δ18O for the latter half of the 20th century reconstructed from firn air analyses
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DOI：
10.1029/2006jd007208
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发表时间：
2007-02-10
影响因子：
4.4
通讯作者：
Nakazawa, Takakiyo
中科院分区：
文献类型：
--
作者：
Ishijima, Kentaro;Sugawara, Satoshi;Nakazawa, Takakiyo
利用1952-2001年格陵兰北格陵兰冰芯项目（NGRIP）和南极洲富士山冰穹（Dome Fuji）和H72冰穹（H72）的雪气资料，对1952-2001年期间大气N2 O浓度及其δ N-15和δ O-18的历史进行了重建。（NO）-O-2浓度从1952年的290 ppbv增加到2001年的316 ppbv，这与大气观测和极地冰芯分析的结果一致。δ N-15和δ O-18呈长期下降趋势，1952年分别为千分之8.9和21.5，2001年分别为千分之7.0和20.5。它们的变化率也各不相同，N-15的变化率从20世纪50年代的约-0.02% yr（-1）到1960-2001年的约-0.04% yr（-1），O-18的变化率从约0 ppm/yr（-1）到-0.02 ppm/yr（-1）。利用双箱模型计算的同位素收支结果表明，工业化后土壤人为N2 O排放对大气N2 O的增加起主要作用，人为N2 O的平均同位素比值也可能发生变化。
Histories of atmospheric N2O concentration and its delta N-15 and delta O-18 were reconstructed for the period 1952-2001 on the basis of the analyses of firn air collected at the North Greenland Ice Core Project (NGRIP), Greenland, and Dome Fuji and H72, Antarctica. The (NO)-O-2 concentration increased from 290 ppbv in 1952 to 316 ppbv in 2001, which agrees well with the results from atmospheric observations and polar ice core analyses. The delta N-15 and delta O-18 showed a secular decrease, the respective values being 8.9 and 21.5 parts per thousand in 1952 and 7.0 and 20.5 parts per thousand in 2001. Their rates of change also varied, from about -0.02% yr(-1) in the 1950s to about -0.04% yr(-1) in 1960-2001 for delta N-15, and from about 0 parts per thousand yr(-1) to -0.02 parts per thousand yr(-1) for delta O-18. The isotopic budgetary calculations using a two-box model indicated that anthropogenic N2O emission from soils played a main role in the atmospheric N2O increase after industrialization, as well as that the average isotopic ratio of anthropogenic N2O has potentially been changed temporally.