Measurements of HCFC‐142b and HCFC‐141b in the Cape Grim air Archive: 1978–1993
Measurements of HCFC‐142b and HCFC‐141b in the Cape Grim air Archive: 1978–1993
复制标题
格里姆角空气档案中 HCFC-142b 和 HCFC-141b 的测量结果：1978-1993 年
DOI：
10.1029/95gl02849
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发表时间：
1995
影响因子：
5.2
通讯作者：
P. Fraser
中科院分区：
文献类型：
--
作者：
D. Oram;C. Reeves;S. Penkett;P. Fraser
自1978年以来在塔斯马尼亚州格里姆角收集的储存空气样本已通过GC-MS进行分析，以调查对流层HCFC-142 b和HCFC-141 b浓度在过去15年中的变化。1978年4月至1993年9月期间，HCFC-142 b的浓度从0.20±0.02 pptv上升到3.0±0.3 pptv，其中大部分增加发生在1989年以后。到1993年年中，增长率达到每年0.9±0.1 pptv。从1982年到1991年，HCFC-141 b的平均浓度为0.08±0.01 pptv。然而，浓度从1992年开始急剧上升，到1993年9月达到0.46±0.05 pptv。使用2-D模型的大气化学，这些观测的约束下，这两种化合物的全球排放量进行了计算，发现不同于其他估计。这部分是由于在其他估计排放量开始之前存在的背景浓度水平。
Stored air samples collected at Cape Grim, Tasmania since 1978, have been analyzed by GC-MS to investigate the change in the tropospheric concentration of HCFC-142b and HCFC-141b over the past 15 years. Between April 1978 and September 1993 the concentration of HCFC-142b rose from 0.20±0.02 pptv to 3.0±0.3 pptv, with the majority of this increase occurring from 1989 onwards. By mid-1993 the rate of increase had reached 0.9±0.1 pptv/yr. From 1982 to 1991 the average concentration of HCFC-141b was 0.08±0.01 pptv. A very sharp increase in concentration began in 1992 however, such that it reached 0.46±0.05 pptv by September 1993. Using a 2-D model of atmospheric chemistry, constrained by these observations, global emissions of these two compounds have been calculated and found to differ from other estimates. This is partly due to the background concentration levels which existed prior to the start of the other estimated emissions.