Zhou, X., Mann, G.W., Feng, W. orcid.org/0000-0002-9907-9120 et al. (2 more authors) (Cover date: 16 October 2023) The Influence of Internal Climate Variability on Stratospheric Water Vapor Increases After Large-Magnitude Explosive Tropical Volcanic Eruptions. Geophysical Research Letters, 50 (19). e2023GL103076. ISSN 0094-8276
Abstract
Substantial and prolonged enhancements in stratospheric water vapor (SWV) have occurred after large-magnitude explosive tropical volcanic eruptions, with modified tropopause entry caused by aerosol-absorptive heating. Here, we analyze the timing and longevity of heating-driven post-eruption SWV changes within CMIP6-VolMIP short-term climate-response experiments with the UK Earth System Model (UKESM1). We find aerosol-absorptive heating causes peak SWV increases of 17% (∼1 ppmv) and 10% (0.5 ppmv) at 100 and 50 hPa, at ∼18 and ∼23 months after a Pinatubo-like eruption, respectively. We track the temperature response in the tropical lower stratosphere and identify the main SWV increase occurs only after the descending aerosol heating reaches the tropopause, suggesting a key role for aerosol microphysical processes (sedimentation rate). We explore how El Niño–Southern Oscillation variability modulates this effect. Post-eruption SWV increases are ∼80% stronger for the La Nina phase compared to the ensemble mean. Tropical upwelling strongly mediates this effect.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | volcanic eruption; stratospheric water vapor; cold-point temperature; aerosol heating; tropical upwelling; ENSO |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > National Centre for Atmos Science (NCAS) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 10 Oct 2023 07:45 |
Last Modified: | 26 Oct 2023 14:59 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1029/2023GL103076 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:203259 |