An Expanded Definition of the Odd Oxygen Family for Tropospheric Ozone Budgets: Implications for Ozone Lifetime and Stratospheric Influence
An Expanded Definition of the Odd Oxygen Family for Tropospheric Ozone Budgets: Implications for Ozone Lifetime and Stratospheric Influence
复制标题
DOI：
10.1029/2019gl084486
复制
发表时间：
2020-02
影响因子：
5.2
通讯作者：
K. Bates;D. Jacob
中科院分区：
文献类型：
--
作者：
K. Bates;D. Jacob
为了计算对流层臭氧的收支和寿命，对流层臭氧模型通常定义“奇氧”族(Ox)，包括臭氧及其快速循环的物种。Ox的一个主要损失是O(1D)+H2O→2OH反应，但这可能不是实际的损失，因为产生的氢氧化物(HOX)自由基在氮氧化物存在的情况下再生臭氧。在这里，我们介绍一个扩展的单氧族，Oy≡Ox+Oz，包括Ox和一个附加的亚家族Oz，Oz由Hox及其储集层组成。我们将这一新的核算纳入到GEOS-Chem模型中，揭示了在当前条件下，与标准Ox预算相比，全球平均臭氧寿命(73天比24天)和平流层贡献(26%比9%)更长。跟踪臭氧消耗预算可能有助于更好地了解全球模型在计算臭氧层源和臭氧层汇时的差异。
Models of tropospheric ozone commonly define an “odd oxygen” family (Ox), comprising ozone and species with which it rapidly cycles, in order to compute tropospheric ozone budgets and lifetimes. A major Ox loss is the O(1D) + H2O → 2OH reaction, but this may not be an actual loss because the resulting hydrogen oxide (HOx) radicals regenerate ozone in the presence of nitrogen oxides. Here we introduce an expanded odd oxygen family, Oy≡ Ox + Oz, to include both Ox and an additional subfamily, Oz, consisting of HOx and its reservoirs. We incorporate this new accounting into the GEOS‐Chem model, revealing a longer global mean ozone lifetime (73 days vs. 24 days) and greater stratospheric contribution (26% vs. 9%) under present‐day conditions than derived from the standard Ox budget. Tracking the Oy budget may provide better understanding of the discrepancies between global models in their computations of ozone sources and sinks.