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Plane, JMC orcid.org/0000-0003-3648-6893, Daly, SM orcid.org/0000-0001-7957-4514, Feng, W orcid.org/0000-0002-9907-9120 et al. (2 more authors) (2021) Meteor-ablated Aluminum in the Mesosphere-Lower Thermosphere. Journal of Geophysical Research: Space Physics, 126 (2). e2020JA028. ISSN 2169-9380
Abstract
The first global atmospheric model (WACCM-Al) of meteor-ablated aluminum was constructed from three components: The Whole Atmospheric Community Climate Model (WACCM6); a meteoric input function for Al derived by coupling an astronomical model of dust sources in the solar system with a chemical meteoric ablation model; and a comprehensive set of neutral, ion-molecule and photochemical reactions relevant to the chemistry of Al in the upper atmosphere. The reaction kinetics of two important reactions that control the rate at which Al+ ions are neutralized were first studied using a fast flow tube with pulsed laser ablation of an Al target, yielding k(AlO+ + CO) = (3.7 ± 1.1) × 10−10 and k(AlO+ + O) = (1.7 ± 0.7) × 10−10 cm3 molecule−1 s−1 at 294 K. The first attempt to observe AlO by lidar was made by probing the bandhead of the B2Σ+(v′ = 0) ← X2Σ+(v″ = 0) transition at λair = 484.23 nm. An upper limit for AlO of 60 cm−3 was determined, which is consistent with a night-time concentration of ∼5 cm−3 estimated from the decay of AlO following rocket-borne grenade releases. WACCM-Al predicts the following: AlO, AlOH and Al+ are the three major species above 80 km; the AlO layer at mid-latitudes peaks at 89 km with a half-width of ∼5 km, and a peak density which increases from a night-time minimum of ∼10 cm−3 to a daytime maximum of ∼60 cm−3; and that the best opportunity for observing AlO is at high latitudes during equinoctial twilight.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021. 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: | aluminum oxide; cosmic dust; lidar; meteoric ablation; reaction kinetics |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds) 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: | 15 Jan 2021 10:34 |
Last Modified: | 10 Jul 2024 10:38 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1029/2020JA028792 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:170006 |
Available Versions of this Item
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Meteor-ablated Aluminum in the Mesosphere-Lower Thermosphere. (deposited 10 Jul 2024 10:38)
- Meteor-ablated Aluminum in the Mesosphere-Lower Thermosphere. (deposited 15 Jan 2021 10:34) [Currently Displayed]