Methyl chloride as a tracer of tropical tropospheric air in the lowermost stratosphere inferred from IAGOS‐CARIBIC passenger aircraft measurements
Methyl chloride as a tracer of tropical tropospheric air in the lowermost stratosphere inferred from IAGOS‐CARIBIC passenger aircraft measurements
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根据 IAGOS-CARIBIC 客机测量推断，氯甲烷作为平流层最低层热带对流层空气的示踪剂
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
P. Velthoven
中科院分区：
文献类型：
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作者：
T. Umezawa;A. Baker;C. Brenninkmeijer;A. Zahn;D. Oram;P. Velthoven
我们介绍了2008-2012年期间全球观测系统民用飞机定期大气调查（IAGOS-CARIBIC）客机观测站收集的空气样品中最低平流层（LMS）中氯甲烷（CH 3Cl）和一氧化二氮（N2 O）的变化。为了校正大气中N2 O的时间增加，CARIBIC N2 O数据表示为与北方半球基线站夏威夷莫纳罗亚山长期趋势的偏差（Δ N2 O）。LMS中Δ N2 O具有明显的季节变化，春季最低。幅度增加到更深的LMS（高达40 K以上的热对流层顶的潜在温度），由于季节性变化的平流层overworld的空气沉降。对流层顶CH 3Cl的季节变化与Δ N2 O的季节变化具有相似的位相。从冬季到初夏，LMS中CH 3Cl和Δ N2 O之间存在显著的相关性，两者都受到平流层和对流层高层空气混合的影响。然而，这种相关性在夏末到秋季消失。在LMS中观察到的CH 3Cl-Δ N2 O相关性的斜率使我们能够确定CH 3Cl的平流层寿命为35 ± 7年。最后，我们研究了平流层空气和热带/热带对流层外的空气在LMS的基础上使用Δ N2 O和CH 3Cl的质量平衡方法的分区。这一分析清楚地表明，有效的流入热带对流层空气进入LMS在夏季，并证明了有用的CH 3Cl作为热带对流层空气的示踪剂。
We present variations of methyl chloride (CH3Cl) and nitrous oxide (N2O) in the lowermost stratosphere (LMS) obtained from air samples collected by the In‐service Aircraft for a Global Observing System‐Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container (IAGOS‐CARIBIC) passenger aircraft observatory for the period 2008–2012. To correct for the temporal increase of atmospheric N2O, the CARIBIC N2O data are expressed as deviations from the long‐term trend at the northern hemispheric baseline station Mauna Loa, Hawaii (ΔN2O). ΔN2O undergoes a pronounced seasonal variation in the LMS with a minimum in spring. The amplitude increases going deeper in the LMS (up to potential temperature of 40 K above the thermal tropopause), as a result of the seasonally varying subsidence of air from the stratospheric overworld. Seasonal variation of CH3Cl above the tropopause is similar in phase to that of ΔN2O. Significant correlations are found between CH3Cl and ΔN2O in the LMS from winter to early summer, both being affected by mixing between stratospheric air and upper tropospheric air. This correlation, however, disappears in late summer to autumn. The slope of the CH3Cl‐ΔN2O correlation observed in the LMS allows us to determine the stratospheric lifetime of CH3Cl to be 35 ± 7 years. Finally, we examine the partitioning of stratospheric air and tropical/extratropical tropospheric air in the LMS based on a mass balance approach using ΔN2O and CH3Cl. This analysis clearly indicates efficient inflow of tropical tropospheric air into the LMS in summer and demonstrates the usefulness of CH3Cl as a tracer of tropical tropospheric air.
影响因子：
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作者：
G. Berthet;J. G. Esler;P. Haynes
通讯作者：
G. Berthet;J. G. Esler;P. Haynes
基于观测的十种重要来源气体的平流层释放分数、寿命和臭氧消耗潜力的评估
影响因子：
6.3
作者：
Laube J
通讯作者：
Laube J