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Impacts of a sudden stratospheric warming on the mesospheric metal layers

Feng, Wuhu and Kaifler, Bernd and Marsh, Daniel R. and Höffner, Josef and Hoppe, Ulf-Peter and Williams, Bifford P. and Plane, John M. C. (2017) Impacts of a sudden stratospheric warming on the mesospheric metal layers. Journal of Atmospheric and Solar-Terrestrial Physics. Elsevier. DOI: 10.1016/j.jastp.2017.02.004 ISSN 1364-6826

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Official URL: http://www.sciencedirect.com/science/article/pii/S1364682617300986

Abstract

We report measurements of atomic sodium, iron and temperature in the mesosphere and lower thermosphere (MLT) made by ground-based lidars at the ALOMAR observatory (69°N, 16°E) during a major sudden stratospheric warming (SSW) event that occurred in January 2009. The high resolution temporal observations allow the responses of the Na and Fe layers to the SSW at high northern latitudes to be investigated. A significant cooling with temperatures as low as 136 K around 90 km was observed on 22–23 January 2009, along with substantial depletions of the Na and Fe layers (an ~80% decrease in the column abundance with respect to the mean over the observation period). The Whole Atmosphere Community Climate Model (WACCM) incorporating the chemistry of Na, Fe, Mg and K, and nudged with reanalysis data below 60 km, captures well the timing of the SSW, although the extent of the cooling and consequently the depletion in the Na and Fe layers is slightly underestimated. The model also predicts that the perturbations to the metal layers would have been observable even at equatorial latitudes. The modelled Mg layer responds in a very similar way to Na and Fe, whereas the K layer is barely affected by the SSW because of the enhanced conversion of K+ ions to K atoms at the very low temperatures.

Item URL in elib:https://elib.dlr.de/111471/
Document Type:Article
Title:Impacts of a sudden stratospheric warming on the mesospheric metal layers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Feng, WuhuUniv. of Leeds, School of Chemistry, Leeds, UKhttps://orcid.org/0000-0002-9907-9120
Kaifler, BerndDLR, IPAhttps://orcid.org/0000-0002-5891-242X
Marsh, Daniel R.NCAR, Boulder, CO, USAhttps://orcid.org/0000-0001-6699-494X
Höffner, JosefUniv. RostockUNSPECIFIED
Hoppe, Ulf-PeterFFI, NorwayUNSPECIFIED
Williams, Bifford P.GATS Inc., Boulder, CO, USAUNSPECIFIED
Plane, John M. C.Univ. of Leeds, School of Chemistry, Leeds, UKhttps://orcid.org/0000-0003-3648-6893
Date:11 February 2017
Journal or Publication Title:Journal of Atmospheric and Solar-Terrestrial Physics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.jastp.2017.02.004
Publisher:Elsevier
ISSN:1364-6826
Status:Published
Keywords:Sudden stratospheric warming; Mesospheric metal layers; Lidar observations; Whole atmosphere model
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: Kaifler, Dr. Natalie
Deposited On:13 Mar 2017 20:32
Last Modified:30 May 2019 22:05

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