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首页> 外文会议>Third International Symposium on Non-Co_2 Greenhouse Gases: Scientific Understanding, Control Options and Policy Aspects Jan 21-23, 2002 Maastricht, The Netherlands >Direct Measurements of the Long-Term Global Increase in Tropospheric Nitrous Oxide
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Direct Measurements of the Long-Term Global Increase in Tropospheric Nitrous Oxide

机译：对流层一氧化二氮长期全球总增长的直接测量

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摘要

Measurements of the background temporal and spatial distributions of nitrous oxide (N_2O) in the global troposphere have continued since 1976, using flask samples collected primarily at the South Pole, Mauna Loa, Hawaii, and Point Barrow, Alaska clean-air stations. The increase in global N_2O first detected by these measurements in 1981 has continued at an annual rate which has risen from a mean of about 0.6 ppb (parts-per-billion, or dry air mole fraction x 10~9) yr~(-1) in 1976 to a mean of about 0.8 ppb yr~(-1) in 2000. The global mean abundance has increased from about 298 ppb in early 1976 to about 315 ppb 25 years later. There has also been a gradual increase in the interhemispheric N_2O gradient. These observations are consistent with an increasing anthropogenic source strength that is located primarily in the northern hemisphere and currently is equivalent to about 20 x 10~(10) moles per year, or about half of the total natural source strength. Based on modeling the distribution of N_2O in the world oceans, about 40% of the natural source strength is estimated to be oceanic, with the remainder being terrestrial.
机译：自1976年以来，对对流层一氧化二氮（N_2O）的背景时空分布的测量一直在进行，使用的采样瓶主要是在夏威夷的莫纳罗亚火山和阿拉斯加的Point Barrow清洁空气站收集的。 1981年通过这些测量首次发现的全球N_2O的增长以每年6％的平均速率继续增长，从每年约6％ppb（十亿分之一，或干燥空气摩尔分数x 10〜9）yr〜（-1 ）在1976年达到年均0.8 ppb yr〜（-1）。全球平均丰度已从19​​76年初的约298 ppb增加到25年后的约315 ppb。半球间N_2O梯度也逐渐增加。这些观察结果与人为源强度的增加相一致，人为源强度主要位于北半球，目前相当于每年约20 x 10〜（10）摩尔，约占自然源总强度的一半。根据世界海洋中N_2O分布的模型，估计约40％的自然资源强度是海洋性的，其余的则是陆地的。

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