Noctilucent clouds and the mesospheric water vapour: the past decade
International audience The topic of this paper is the expected (from modelling) and observed sensitivity of the brightness ? of noctilucent clouds (NLC) on the ambient water vapour mixing ratio f (H 2 O). Firstly, we show that state-of-the-art models of NLC layer formation predict that in the Arctic...
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ftccsdartic:oai:HAL:hal-00301283v1 2023-11-12T04:12:01+01:00 Noctilucent clouds and the mesospheric water vapour: the past decade von Zahn, U. Berger, U. Fiedler, J. Hartogh, P. Leibniz-Institute of Atmospheric Physics (AIP) Max Planck Institute for Aeronomy (MPAe) Max-Planck-Gesellschaft 2004-06-04 https://hal.science/hal-00301283 https://hal.science/hal-00301283/document https://hal.science/hal-00301283/file/acpd-4-3045-2004.pdf en eng HAL CCSD European Geosciences Union hal-00301283 https://hal.science/hal-00301283 https://hal.science/hal-00301283/document https://hal.science/hal-00301283/file/acpd-4-3045-2004.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00301283 Atmospheric Chemistry and Physics Discussions, 2004, 4 (3), pp.3045-3076 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2004 ftccsdartic 2023-10-21T23:13:31Z International audience The topic of this paper is the expected (from modelling) and observed sensitivity of the brightness ? of noctilucent clouds (NLC) on the ambient water vapour mixing ratio f (H 2 O). Firstly, we show that state-of-the-art models of NLC layer formation predict that in the Arctic summer, a 10% increase of f (H 2 O) in the upper mesosphere should lead to a 22% increase in ?. Secondly, we review observations of episodic changes in f (H 2 O) and those in ?, the former being available since 1992, the latter since 1979. We also add a new series of observations of f (H 2 O) in the Arctic summer, performed at the ALOMAR observatory (69° N). Thirdly, we show that an increase in daily averaged f (H 2 O) observed in the Arctic summer since 1996, when introduced into the NLC models, comes close to explaining the observed increase in ?. In contrast to this gratifying situation for the summer means of f (H 2 O) and ? (the latter being available only in summer anyway), the behaviour of annual means of f (H 2 O) is quite different. Those indicate that since 1996 significant decreases of annually averaged upper mesospheric water vapour have occurred at low, mid, and high latitude which can not be used to explain the observed near-stability in NLC brightness over this time period. We close with comments on the very different character of decadal variations in NLC brightness and occurrence rate. Article in Journal/Newspaper Arctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Alomar ENVELOPE(-67.083,-67.083,-68.133,-68.133) Arctic |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere von Zahn, U. Berger, U. Fiedler, J. Hartogh, P. Noctilucent clouds and the mesospheric water vapour: the past decade |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience The topic of this paper is the expected (from modelling) and observed sensitivity of the brightness ? of noctilucent clouds (NLC) on the ambient water vapour mixing ratio f (H 2 O). Firstly, we show that state-of-the-art models of NLC layer formation predict that in the Arctic summer, a 10% increase of f (H 2 O) in the upper mesosphere should lead to a 22% increase in ?. Secondly, we review observations of episodic changes in f (H 2 O) and those in ?, the former being available since 1992, the latter since 1979. We also add a new series of observations of f (H 2 O) in the Arctic summer, performed at the ALOMAR observatory (69° N). Thirdly, we show that an increase in daily averaged f (H 2 O) observed in the Arctic summer since 1996, when introduced into the NLC models, comes close to explaining the observed increase in ?. In contrast to this gratifying situation for the summer means of f (H 2 O) and ? (the latter being available only in summer anyway), the behaviour of annual means of f (H 2 O) is quite different. Those indicate that since 1996 significant decreases of annually averaged upper mesospheric water vapour have occurred at low, mid, and high latitude which can not be used to explain the observed near-stability in NLC brightness over this time period. We close with comments on the very different character of decadal variations in NLC brightness and occurrence rate. |
author2 |
Leibniz-Institute of Atmospheric Physics (AIP) Max Planck Institute for Aeronomy (MPAe) Max-Planck-Gesellschaft |
format |
Article in Journal/Newspaper |
author |
von Zahn, U. Berger, U. Fiedler, J. Hartogh, P. |
author_facet |
von Zahn, U. Berger, U. Fiedler, J. Hartogh, P. |
author_sort |
von Zahn, U. |
title |
Noctilucent clouds and the mesospheric water vapour: the past decade |
title_short |
Noctilucent clouds and the mesospheric water vapour: the past decade |
title_full |
Noctilucent clouds and the mesospheric water vapour: the past decade |
title_fullStr |
Noctilucent clouds and the mesospheric water vapour: the past decade |
title_full_unstemmed |
Noctilucent clouds and the mesospheric water vapour: the past decade |
title_sort |
noctilucent clouds and the mesospheric water vapour: the past decade |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00301283 https://hal.science/hal-00301283/document https://hal.science/hal-00301283/file/acpd-4-3045-2004.pdf |
long_lat |
ENVELOPE(-67.083,-67.083,-68.133,-68.133) |
geographic |
Alomar Arctic |
geographic_facet |
Alomar Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00301283 Atmospheric Chemistry and Physics Discussions, 2004, 4 (3), pp.3045-3076 |
op_relation |
hal-00301283 https://hal.science/hal-00301283 https://hal.science/hal-00301283/document https://hal.science/hal-00301283/file/acpd-4-3045-2004.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782330810607599616 |