How Atmospheric Chemistry and Transport Drive Surface Variability of N <sub>2</sub> O and CFC?11
نویسندگان
چکیده
Nitrous oxide (N2O) is a long-lived greenhouse gas that affects atmospheric chemistry and climate. In this work, we use satellite measurements of N2O, ozone (O3), temperature from the Aura Microwave Limb Sounder (MLS) instrument to calculate stratospheric loss thus its lifetime. Using three transport models simulating period 2005–2017, verify sink using MLS data follow signal down surface compare with observations. Stratospheric has strong seasonal cycle further modulated by Quasi-Biennial Oscillation (QBO); these cycles are seen equally in both observations models. When filtered for interannual variability, modeled QBO-caused, it reproduces observed pattern, highlighting potential role QBO tropospheric composition, as well model evaluation. The annual northern hemisphere matches run without emissions, indicating driven mostly stratosphere-troposphere exchange (STE) flux N2O-depleted air not N2O emissions. southern (SH), all disagree provide no guidance, except modeling STE SH remains major uncertainty. Parallel simulations CFCl3, which greater possibly surreptitious show variations parallel those variability can identify component CFCl3 variability.
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ژورنال
عنوان ژورنال: Journal Of Geophysical Research: Atmospheres
سال: 2021
ISSN: ['2169-8996', '2169-897X']
DOI: https://doi.org/10.1029/2020jd033979