Reformulating the bromine alpha factor and equivalent effective stratospheric chlorine (EESC): evolution of ozone destruction rates of bromine and chlorine in future climate scenarios
Reformulating the bromine alpha factor and equivalent effective stratospheric chlorine (EESC): evolution of ozone destruction rates of bromine and chlorine in future climate scenarios
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DOI：
10.5194/acp-20-9459-2020
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发表时间：
2020-08-13
影响因子：
6.3
通讯作者：
Wilmouth, David M.
中科院分区：
文献类型：
--
作者：
Klobas, J. Eric;Weisenstein, Debra K.;Wilmouth, David M.
平流层痕量气体本底的未来轨迹将通过改变无机卤素库的划分和平流层的基本温度结构，改变溴和氯介导的催化臭氧破坏速率。溴α因子，即平流层溴原子相对于平流层氯原子的臭氧破坏能力，目前的表述方式不随气候状况而变化。在这里，我们重构溴α因子，引入标准化的基准化学气候状态，并制定等效平流层基准归一化氯（EESBnC），以反映溴和氯介导的臭氧损失催化率随时间的变化。我们表明，臭氧处理能力极外平流层显着扰动未来的气候假设。此外，我们表明，我们的EESBnC为基础的极外臭氧恢复日期的估计是在更接近的协议与极外臭氧恢复日期预测使用更复杂的3-D化学气候模型比预测使用等效平流层氯（EESC）。
Future trajectories of the stratospheric trace gas background will alter the rates of bromine- and chlorine-mediated catalytic ozone destruction via changes in the partitioning of inorganic halogen reservoirs and the underlying temperature structure of the stratosphere. The current formulation of the bromine alpha factor, the ozone-destroying power of stratospheric bromine atoms relative to stratospheric chlorine atoms, is invariant with the climate state. Here, we refactor the bromine alpha factor, introducing normalization to a benchmark chemistry-climate state, and formulate Equivalent Effective Stratospheric Benchmark-normalized Chlorine (EESBnC) to reflect changes in the rates of both bromine- and chlorine-mediated ozone loss catalysis with time. We show that the ozone-processing power of the extrapolar stratosphere is significantly perturbed by future climate assumptions. Furthermore, we show that our EESBnC-based estimate of the extrapolar ozone recovery date is in closer agreement with extrapolar ozone recovery dates predicted using more sophisticated 3-D chemistry-climate models than predictions made using equivalent effective stratospheric chlorine (EESC).