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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2021
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ftleibnizopen:oai:oai.leibnizopen.de:tkmiqIgBdbrxVwz6uPt4 2023-07-02T03:31:24+02:00 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 2023-06-11T23:20:04Z 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 LeibnizOpen (The Leibniz Association) Arctic |
institution |
Open Polar |
collection |
LeibnizOpen (The Leibniz Association) |
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 |
_version_ |
1770270801902174208 |