Reconstruction of Paleofire Emissions Over the Past Millennium From Measurements of Ice Core Acetylene
Reconstruction of Paleofire Emissions Over the Past Millennium From Measurements of Ice Core Acetylene
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DOI：
10.1029/2019gl085101
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发表时间：
2020-02
影响因子：
5.2
通讯作者：
M. R. Nicewonger;M. Aydin;M. Prather;E. Saltzman
中科院分区：
文献类型：
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作者：
M. R. Nicewonger;M. Aydin;M. Prather;E. Saltzman
乙炔是一种在化石燃料、生物质和生物燃料燃烧过程中产生的短寿命痕量气体。生物质燃烧可能是工业化前大气中乙炔的唯一主要来源，这使得冰芯乙炔成为重建古火排放的有力工具。在这里，我们提出了一个2,000年的乙炔大气记录重建从分析气泡被困在格陵兰岛和南极冰芯和推断热解乙炔排放使用化学传输模型。从0到1500年，南极洲的乙炔平均值为36 ± 1 pmol mol − 1（平均值± 1 SE），大约是今天南极洲年平均值的两倍。在小冰期期间，南极的乙炔减少了50%，从1650年到1750年减少到17 ± 2 pmol mol − 1。同期格陵兰岛上空的乙炔下降幅度较小。模拟结果表明，1000 - 1500 CE期间的热解乙炔排放量持续的速度显着大于现代，并在1650 - 1750 CE期间下降了50%以上。
Acetylene is a short‐lived trace gas produced during combustion of fossil fuels, biomass, and biofuels. Biomass burning is likely the only major source of acetylene in the preindustrial atmosphere, making ice core acetylene a powerful tool for reconstructing paleofire emissions. Here we present a 2,000‐year atmospheric record of acetylene reconstructed from analysis of air bubbles trapped in Greenland and Antarctic ice cores and infer pyrogenic acetylene emissions using a chemistry transport model. From 0 to 1500 CE, Antarctic acetylene averages 36 ± 1 pmol mol−1 (mean ± 1 SE), roughly double the annual mean over Antarctica today. Antarctic acetylene declines during the Little Ice Age by over 50% to 17 ± 2 pmol mol−1 from 1650 to 1750 CE. Acetylene over Greenland declines less dramatically over the same period. Modeling results suggest that pyrogenic acetylene emissions during 1000–1500 CE were sustained at rates significantly greater than modern day and declined by over 50% during the 1650–1750 CE period.