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- Title
Contrasting the Biophysical and Radiative Effects of Rising CO<sub>2</sub> Concentrations on Ozone Dry Deposition Fluxes.
- Authors
Silva, Sam J.; Burrows, Susannah M.; Calvin, Katherine; Cameron‐Smith, Philip J.; Shi, Xiaoying; Zhou, Tian
- Abstract
The dry deposition of ozone from the atmosphere to ecosystems is an important coupling mechanism between atmospheric chemistry and terrestrial biogeochemical processes. In most Earth system models, dry deposition is simulated using a resistor‐in‐series approach that aims to parameterize the governing biological, chemical, and physical processes through a series of functional approximations. Here, we evaluate the influence of carbon cycle‐climate responses on this parameterization using the results of the Energy Exascale Earth System Model v1.1 Biogeochemistry simulation campaign. This simulation campaign was designed in part to explore the biophysical and radiative effects of rising historical CO2 concentrations on the Earth system. We find that while the global annual ozone dry deposition is relatively insensitive to these effects, regionally the influence can be up to 10%. The strongest regional sensitivities in ozone dry deposition are predominantly in higher latitudes over land in the northern hemisphere and are dominated by the radiative effect of CO2, with little net influence of biophysical responses. Of all the impacts of the radiative effect of CO2, we point to the potential importance of accurately representing ozone deposition to snow in Earth System Models and provide recommendations for future simulation campaigns. Plain Language Summary: Ozone is removed from the atmosphere through a process known as "dry deposition." Most climate and air quality models use a similar method to predict ozone dry deposition. Here, we evaluate the impact of rising CO2 concentrations on ozone dry deposition using this widely used prediction method and a global climate model. We find that the global total amount of ozone deposition doesn't change much with rising CO2 concentrations. However, regionally the changes can be large. Using a set of computer simulation experiments we find that most of these changes are driven by the interactions of rising CO2 with radiation, as opposed to the interactions of CO2 with plants. Key Points: We evaluate the influence of historical carbon cycle‐climate responses on simulated ozone dry depositionThe net effect of carbon‐cycle climate responses on ozone deposition is small on the global average, but regionally can be up to 10%The radiative effect of CO2 dominates the sensitivity of ozone dry deposition to rising CO2 concentrations
- Subjects
CARBON cycle; CLIMATE change models; OZONE; ATMOSPHERIC chemistry
- Publication
Journal of Geophysical Research. Atmospheres, 2023, Vol 128, Issue 6, p1
- ISSN
2169-897X
- Publication type
Article
- DOI
10.1029/2022JD037668