Long term trends of mesopheric ice layers: A model study

Trends derived from the Leibniz-Institute Middle Atmosphere Model (LIMA) and the MIMAS ice particle model (Mesospheric Ice Microphysics And tranSport model) are presented for a period of 138 years (1871–2008) and for middle, high, and arctic latitudes, namely 58°N, 69°N, and 78°N, respectively. We f...

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Main Authors: Lübken, Franz-Josef, Baumgarten, Gerd, Berger, Uwe
Format: Article in Journal/Newspaper
Language:English
Published: Amsterdam [u.a.] : Elsevier Science 2021
Subjects:
530
Online Access:https://oa.tib.eu/renate/handle/123456789/8176
https://doi.org/10.34657/7215
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spelling ftleibnizopen:oai:oai.leibnizopen.de:KSePVYsBBwLIz6xGggWM 2023-11-12T04:12:30+01:00 Long term trends of mesopheric ice layers: A model study Lübken, Franz-Josef Baumgarten, Gerd Berger, Uwe 2021 application/pdf https://oa.tib.eu/renate/handle/123456789/8176 https://doi.org/10.34657/7215 eng eng Amsterdam [u.a.] : Elsevier Science CC BY-NC-ND 4.0 Unported https://creativecommons.org/licenses/by-nc-nd/4.0/ Journal of atmospheric and solar-terrestrial physics 214 (2021) Noctilucent clouds Summer mesopause region Trends in the middle atmosphere 530 article Text 2021 ftleibnizopen https://doi.org/10.34657/7215 2023-10-22T23:18:35Z Trends derived from the Leibniz-Institute Middle Atmosphere Model (LIMA) and the MIMAS ice particle model (Mesospheric Ice Microphysics And tranSport model) are presented for a period of 138 years (1871–2008) and for middle, high, and arctic latitudes, namely 58°N, 69°N, and 78°N, respectively. We focus on the analysis of mesospheric ice layers (NLC, noctilucent clouds) in the main summer season (July) and on yearly mean values. Model runs with and without an increase of carbon dioxide and water vapor (from methane oxidation) concentrations are performed. Trends are most prominent after ~1960 when the increase of both CO2 and H2O accelerates. It is important to distinguish between tendencies on geometric altitudes and on given pressure levels converted to altitudes (‘pressure altitudes’). Negative trends of (geometric) NLC altitudes are primarily due to cooling below NLC altitudes caused by CO2 increase. Increases of ice particle radii and NLC brightness with time are mainly caused by an enhancement of water vapor. Several ice layer and background parameter trends are similar at high and arctic latitudes but are substantially different at middle latitudes. This concerns, for example, occurrence rates, ice water content (IWC), and number of ice particles in a column. Considering the time period after 1960, geometric altitudes of NLC decrease by approximately 260 m per decade, and brightness increases by roughly 50% (1960–2008), independent of latitude. NLC altitudes decrease by approximately 15–20 m per increase of CO2 by 1 ppmv. The number of ice particles in a column and also at the altitude of maximum backscatter is nearly constant with time. At all latitudes, yearly mean NLC appear at altitudes where temperatures are close to 145±1 K. Ice particles are present nearly all the time at high and arctic latitudes, but are much less common at middle latitudes. Ice water content and maximum backscatter (βmax) are highly correlated, where the slope depends on latitude. This allows to combine data sets from satellites ... Article in Journal/Newspaper Arctic Unknown Arctic
institution Open Polar
collection Unknown
op_collection_id ftleibnizopen
language English
topic Noctilucent clouds
Summer mesopause region
Trends in the middle atmosphere
530
spellingShingle Noctilucent clouds
Summer mesopause region
Trends in the middle atmosphere
530
Lübken, Franz-Josef
Baumgarten, Gerd
Berger, Uwe
Long term trends of mesopheric ice layers: A model study
topic_facet Noctilucent clouds
Summer mesopause region
Trends in the middle atmosphere
530
description Trends derived from the Leibniz-Institute Middle Atmosphere Model (LIMA) and the MIMAS ice particle model (Mesospheric Ice Microphysics And tranSport model) are presented for a period of 138 years (1871–2008) and for middle, high, and arctic latitudes, namely 58°N, 69°N, and 78°N, respectively. We focus on the analysis of mesospheric ice layers (NLC, noctilucent clouds) in the main summer season (July) and on yearly mean values. Model runs with and without an increase of carbon dioxide and water vapor (from methane oxidation) concentrations are performed. Trends are most prominent after ~1960 when the increase of both CO2 and H2O accelerates. It is important to distinguish between tendencies on geometric altitudes and on given pressure levels converted to altitudes (‘pressure altitudes’). Negative trends of (geometric) NLC altitudes are primarily due to cooling below NLC altitudes caused by CO2 increase. Increases of ice particle radii and NLC brightness with time are mainly caused by an enhancement of water vapor. Several ice layer and background parameter trends are similar at high and arctic latitudes but are substantially different at middle latitudes. This concerns, for example, occurrence rates, ice water content (IWC), and number of ice particles in a column. Considering the time period after 1960, geometric altitudes of NLC decrease by approximately 260 m per decade, and brightness increases by roughly 50% (1960–2008), independent of latitude. NLC altitudes decrease by approximately 15–20 m per increase of CO2 by 1 ppmv. The number of ice particles in a column and also at the altitude of maximum backscatter is nearly constant with time. At all latitudes, yearly mean NLC appear at altitudes where temperatures are close to 145±1 K. Ice particles are present nearly all the time at high and arctic latitudes, but are much less common at middle latitudes. Ice water content and maximum backscatter (βmax) are highly correlated, where the slope depends on latitude. This allows to combine data sets from satellites ...
format Article in Journal/Newspaper
author Lübken, Franz-Josef
Baumgarten, Gerd
Berger, Uwe
author_facet Lübken, Franz-Josef
Baumgarten, Gerd
Berger, Uwe
author_sort Lübken, Franz-Josef
title Long term trends of mesopheric ice layers: A model study
title_short Long term trends of mesopheric ice layers: A model study
title_full Long term trends of mesopheric ice layers: A model study
title_fullStr Long term trends of mesopheric ice layers: A model study
title_full_unstemmed Long term trends of mesopheric ice layers: A model study
title_sort long term trends of mesopheric ice layers: a model study
publisher Amsterdam [u.a.] : Elsevier Science
publishDate 2021
url https://oa.tib.eu/renate/handle/123456789/8176
https://doi.org/10.34657/7215
geographic Arctic
geographic_facet Arctic
genre Arctic
genre_facet Arctic
op_source Journal of atmospheric and solar-terrestrial physics 214 (2021)
op_rights CC BY-NC-ND 4.0 Unported
https://creativecommons.org/licenses/by-nc-nd/4.0/
op_doi https://doi.org/10.34657/7215
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