Daly, SM orcid.org/0000-0001-7957-4514, Feng, W, Mangan, TP orcid.org/0000-0001-7053-5594 et al. (2 more authors) (2020) The Meteoric Ni Layer in the Upper Atmosphere. Journal of Geophysical Research: Space Physics. ISSN 2169-9380
Abstract
The first global atmospheric model of Ni (WACCM‐Ni) has been developed to understand recent observations of the mesospheric Ni layer by ground‐based resonance lidars. The three components of the model comprise: the Whole Atmospheric Community Climate Model (WACCM6); a meteoric input function 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 pertinent to the chemistry of Ni in the upper atmosphere. In order to achieve closure on the chemistry, the reaction kinetics of three important reactions were first studied using a fast flow tube with pulsed laser ablation of a Ni target, yielding k (NiO + O) = (4.6 ± 1.4) × 10‐11, k (NiO + CO) = (3.0 ± 0.5) × 10‐11, and k (NiO2 + O) = (2.5 ± 1.2) × 10‐11 cm3 molecule‐1 s‐1 at 294 K. The photodissociation rate of NiOH was computed to be J (NiOH) = 0.02 s‐1. WACCM‐Ni simulates satisfactorily the observed neutral Ni layer peak height and width, and Ni+ measurements from rocket‐borne mass spectrometry. The Ni layer is predicted to have a similar seasonal and latitudinal variation as the Fe layer, and its usually broad bottom‐side compared with Fe is caused by the relatively fast NiO + CO reaction. The quantum yield for photon emission from the Ni + O3, observed in the nightglow, is estimated to be between 6 and 40%.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | ©2019 American Geophysical Union. All rights reserved. |
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) |
Funding Information: | Funder Grant number NERC (Natural Environment Research Council) NE/P001815/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 10 Jul 2020 15:23 |
Last Modified: | 10 Jul 2020 15:23 |
Status: | Published online |
Publisher: | American Geophysical Union (AGU) |
Identification Number: | 10.1029/2020ja028083 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:162915 |
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