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Quantifying the Imprints of Stratospheric Contributions to Interhemispheric Differences in Tropospheric CFC‐11, CFC‐12, and N 2 O Abundances
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2021
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Source: Geophysical Research Letters, 48(15)
[PDF-780.07 KB]
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Journal Title:Geophysical Research Letters
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Description:For trace gases destroyed in the stratosphere, mass flux across the tropopause can substantially influence observed surface hemispheric differences (NH-SH). Here, we quantify associations between observed stratospheric and tropospheric NH-SH growth rate anomalies of CFC-11, CFC-12, and N2O. We employ a chemistry climate model along with satellite and global surface station observations. Our model explains 60% of observed N 2O NH-SH growth rate variability from 2005 to 2019, compared to 30% for CFC-11% and 40% for CFC-12, supporting evidence that unexpected anthropogenic emissions caused sustained positive NH-SH anomalies in these CFCs from 2012 to 2017. Between 2012 and 2015,
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Source:Geophysical Research Letters, 48(15)
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DOI:
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ISSN:0094-8276;1944-8007;
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Rights Information:Other
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Compliance:Library
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