大气趋势与 CH3CCI3 和全球 OH 浓度的寿命。

Atmospheric Trends and Lifetime of CH3CCI3 and Global OH Concentrations.

出版信息

Science. 1995 Jul 14;269(5221):187-92. doi: 10.1126/science.269.5221.187.

DOI:10.1126/science.269.5221.187

Abstract

Determination of the atmospheric concentrations and lifetime of trichloroethane (CH(3)CCI(3)) is very important in the context of global change. This halocarbon is involved in depletion of ozone, and the hydroxyl radical (OH) concentrations determined from its lifetime provide estimates of the lifetimes of most other hydrogen-containing gases involved in the ozone layer and climate. Global measurements of trichloroethane indicate rising concentrations before and declining concentrations after late 1991. The lifetime of CH(3)CCI(3) in the total atmosphere is 4.8 +/- 0.3 years, which is substantially lower than previously estimated. The deduced hydroxyl radical concentration, which measures the atmosphere's oxidizing capability, shows little change from 1978 to 1994.

摘要

测定三氯乙烷（CH（3）CCI（3））在大气中的浓度和寿命对于全球变化来说非常重要。这种卤代烃参与了臭氧的消耗，而根据其寿命确定的羟基自由基（OH）浓度则提供了参与臭氧层和气候的大多数其他含氢气体的寿命估计值。全球范围内对三氯乙烷的测量表明，其浓度在 1991 年底之前上升，之后下降。CH（3）CCI（3）在整个大气中的寿命为 4.8 ± 0.3 年，远低于先前的估计值。羟基自由基浓度的推断值，该值衡量大气的氧化能力，从 1978 年到 1994 年几乎没有变化。