Millennial‐Scale Changes in Terrestrial and Marine Nitrous Oxide Emissions at the Onset and Termination of Marine Isotope Stage 4

Millennial‐Scale Changes in Terrestrial and Marine Nitrous Oxide Emissions at the Onset and Termination of Marine Isotope Stage 4
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海洋同位素第四阶段开始和结束时陆地和海洋一氧化二氮排放的千禧年规模变化

DOI:
10.1029/2020gl089110
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发表时间:
2020
影响因子:
5.2
通讯作者:
Petrenko, V. V.
Petrenko, V. V.
中科院分区:
地球科学1区
文献类型:
--
作者:
Menking, J. A.;Brook, E. J.;Schilt, A.;Shackleton, S.;Dyonisius, M.;Severinghaus, J. P.;Petrenko, V. V.

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对74,000 - 59,000年前大气一氧化二氮(N2 O)的浓度和稳定同位素组成的冰芯测量限制了海洋和陆地排放。这些数据包括两个主要的Dansgaard‐Oeschger(D‐O)事件和海洋同位素阶段(MIS)5a‐4过渡期间全球冷却期间的N2 O减少。与D-O 19(~73-71.5 ka)相关的N2 O增加是由海洋和陆地排放的同等贡献驱动的。在过渡到MIS 4(~71.5-67.5 ka)的N2 O的减少是由海洋和陆地来源的类似幅度的逐渐减少造成的。在MIS 4末期,N2 O浓度增加了50 ppb,这是由于海洋和陆地排放在~64和61 ka之间逐渐增加,随后在D‐O 16/17(59.5 ka)开始时海洋排放突然增加造成的。这表明,海洋与陆地排放在控制千年尺度N2 O波动方面的重要性随时间而变化。
Ice core measurements of the concentration and stable isotopic composition of atmospheric nitrous oxide (N2O) 74,000–59,000 years ago constrain marine and terrestrial emissions. The data include two major Dansgaard‐Oeschger (D‐O) events and the N2O decrease during global cooling at the Marine Isotope Stage (MIS) 5a‐4 transition. The N2O increase associated with D‐O 19 (~73–71.5 ka) was driven by equal contributions from marine and terrestrial emissions. The N2O decrease during the transition into MIS 4 (~71.5–67.5 ka) was caused by gradual reductions of similar magnitude in both marine and terrestrial sources. A 50 ppb increase in N2O concentration at the end of MIS 4 was caused by gradual increases in marine and terrestrial emissions between ~64 and 61 ka, followed by an abrupt increase in marine emissions at the onset of D‐O 16/17 (59.5 ka). This suggests that the importance of marine versus terrestrial emissions in controlling millennial‐scale N2O fluctuations varied in time.
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