Stratosphere‐Troposphere Exchanges of Air Mass and Ozone Concentration in the Last Glacial Maximum
Name
JGR Atmospheres - 2022 - Wang - Stratosphere‐Troposphere Exchanges of Air Mass and Ozone Concentration in the Last Glacial.pdf
Description
Published version
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866.21 KB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Wang, Mingcheng
Fu, Qiang
Solomon, Susan
Alexander, Becky
White, Rachel H
Date Issued
May 9, 2022
Journal
Journal of Geophysical Research: Atmospheres
Publisher
American Geophysical Union
Citation
Wang, M., Fu, Q., Solomon, S., Alexander, B., & White, R. H. (2022). Stratosphere-troposphere exchanges of air mass and ozone concentration in the Last Glacial Maximum. Journal of Geophysical Research: Atmospheres, 127, e2021JD036327.
Version
Final published version
Abstract
Stratosphere‐troposphere exchange (STE) of ozone represents a significant source term in the tropospheric ozone budget and can impact surface ozone concentrations, tropospheric oxidation capacity, and methane lifetime. Using the Whole Atmosphere Community Climate Model 6, changes in the air mass and ozone STEs in the Last Glacial Maximum (LGM) as compared with preindustrial (PI) climate are investigated. We use dynamic isentropic surfaces that are determined by fitting to the tropical tropopauses as the upper boundary of the lowermost stratosphere in a mass budget approach, a method particularly suitable for estimating air mass and ozone STEs across different climates. Relative to the PI, the magnitude of ozone STE in the LGM is decreased by 14%–19%, 18%–24%, 18%–23%, 16%–21%, and 15%–21% over the Northern hemisphere extratropics, Southern hemisphere extratropics, the tropics, the extratropics, and the globe, respectively. The extratropical and global decreases are mainly caused by decreased ozone in the extratropical lower stratosphere associated with a weakening of Brewer‐Dobson circulation, while changes in air mass fluxes play a minor role because the effects of weakening Brewer‐Dobson circulation and increased isentropic density partly cancel each other. Analysis of the modeled tropospheric ozone budget indicates that the ozone STE in the LGM is 28% of the tropospheric ozone production rate, as compared to about 9% in the modern climate (year 2000) and 19% in the PI.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
10.1029/2021jd036327
