UCI CTM model simulations used for deriving the spillover of tropospheric ozone into the stratosphere

The world has made great strides in phasing out the halocarbons that drive ozone loss, such as the chlorofluorocarbons 11 and 12. While living with the well-documented depletion of the ozone layer, we are now watching the slow recovery (increase) of stratospheric ozone over this century after our phaseout of halocarbon production and use. Projecting this recovery date also depends on the impact of other changing greenhouse gases on stratospheric chemistry as well as changes in tropospheric ozone. Both observations and models identify tropospheric ozone as increasing due to air-quality pollution in the lower atmosphere. Here, using a global chemistry-transport model, we find that this ozone increase carries over into the stratosphere at rates affecting the recovery expected from the decay of atmospheric halocarbons. This process is inherently included in our chemistry-climate models but is not diagnosed as such. The ozone assessments need to consider that what happens in the troposphere ..., This dataset was calculated using the UC Irvine Chemistry-Transport Model (CTM). The ozone simulations with this model are documented further in recent publications noted below.
The calculations used monthly snapshot 3D data on dry-air mass, O3 mass, and e90 mass (to determine tropospheric cells as e90 > 90 ppb). The 4D data sets (longitude/320, latitude/160, pressure level/57, and month/12) are archived here as NetCDF files.
References:

Prather, M.J. and Xin Zhu (2024) Lifetimes and timescales of tropospheric ozone, Elementa: Science of the Anthropocene, 12 (1): 00112, doi: 10.1525/elementa.2023.00112
Sand, Maria, R. B. Skeie, M. Sandstad, S. Krishnan, G. Myhre, H. Bryant, R. Derwent, D. Hauglustaine, F. Paulot, M. Prather & D. Stevenson (2023) A multi-model assessment of the Global Warming Potential of hydrogen, Nature Communications: Earth & Environment, 4:203, doi: 10.1038/s43247-023-00857-8.
, , # UCI CTM model simulations used for deriving the spillover of tropospheric ozone into the stratosphere

[https://doi.org/10.5061/dryad.dr7sqvb66](https://doi.org/10.5061/dryad.dr7sqvb66)

These datasets are used in the derivation of the spillover of tropospheric ozone into the stratosphere as discussed in the manuscript: *Prather, M. J. (2024) The Spillover of Tropospheric Ozone Increases has hidden the Extent of Stratospheric Ozone Depletion by Halogens, AGU Advances, ms#: 2023AV001154R*

The goal of these model simulations with the UCI CTM is to separate the effect of tropospheric chemistry-driven increases in ozone from stratospheric. Hence some ozone tracers have only stratospheric chemistry, while the primary ozone calculation uses tropospheric-plus-stratospheric chemistry. The datasets include the CTM output necessary to separate ozone into stratospheric and tropospheric with a set of monthly samples over the final year of the calculation.

## Description of the data and file str...

全球在逐步淘汰导致臭氧损耗的卤代烃（halocarbons）方面已取得重大进展，例如氟氯烃11（chlorofluorocarbon 11）和氟氯烃12（chlorofluorocarbon 12）。尽管我们仍需面对有据可查的臭氧层损耗问题，但在淘汰卤代烃生产与使用后，本世纪平流层臭氧（stratospheric ozone）正呈现缓慢恢复（增长）的趋势。预测这一恢复日期还取决于其他变化中的温室气体对平流层化学过程的影响，以及对流层臭氧（tropospheric ozone）的变化。观测与模型均表明，由于低层大气的空气质量污染，对流层臭氧浓度正在上升。本研究利用全球化学传输模型（global chemistry-transport model）发现，这种臭氧增长会以一定速率渗透至平流层，从而影响大气卤代烃衰减所预期的臭氧恢复进程。这一过程本质上已包含在我们的化学-气候模型（chemistry-climate model）中，但尚未被明确诊断。臭氧评估需考虑对流层中发生的过程...

本数据集通过加州大学欧文分校化学传输模型（UC Irvine Chemistry-Transport Model，CTM）计算生成。该模型的臭氧模拟结果在下文提及的近期出版物中有更详细的记录。

参考文献：

Prather, M.J. 与Xin Zhu（2024）：对流层臭氧的寿命与时间尺度，《Elementa：人类世科学》，12（1）：00112，DOI：10.1525/elementa.2023.00112
Sand, Maria, R. B. Skeie, M. Sandstad, S. Krishnan, G. Myhre, H. Bryant, R. Derwent, D. Hauglustaine, F. Paulot, M. Prather & D. Stevenson（2023）：氢的全球变暖潜能值多模型评估，《自然通讯：地球与环境》，4：203，DOI：10.1038/s43247-023-00857-8.

# 用于推导对流层臭氧向平流层溢出的加州大学欧文分校CTM模型模拟

[https://doi.org/10.5061/dryad.dr7sqvb66](https://doi.org/10.5061/dryad.dr7sqvb66)

这些数据集用于推导对流层臭氧向平流层的溢出效应，相关内容已在以下手稿中讨论：*Prather, M.J.（2024）：对流层臭氧增长的溢出效应掩盖了卤素对平流层臭氧损耗的程度，《AGU进展》，稿件编号：2023AV001154R*

加州大学欧文分校CTM模型模拟的目标是分离对流层化学过程驱动的臭氧增长效应与平流层的效应。因此，部分臭氧示踪剂（ozone tracers）仅包含平流层化学过程，而主要臭氧计算则同时采用对流层与平流层化学过程。数据集包含将臭氧分离为平流层与对流层组分所需的CTM输出结果，以及计算最后一年的月度样本集。

数据与文件结构描述...