Water vapour and methane coupling in the stratosphere observed using SCIAMACHY solar occultation measurements
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Published:2018-04-03
Issue:7
Volume:18
Page:4463-4476
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Noël StefanORCID, Weigel KatjaORCID, Bramstedt KlausORCID, Rozanov Alexei, Weber Mark, Bovensmann Heinrich, Burrows John P.ORCID
Abstract
Abstract. An improved stratospheric water vapour data set has been retrieved from SCIAMACHY/ENVISAT solar
occultation measurements. It is similar to that successfully applied to
methane and carbon dioxide. There is now a consistent set of data products
for the three constituents covering the altitudes 17–45 km, the
latitude range between about 50 and 70∘ N, and the period August
2002 to April 2012. The new water vapour concentration profiles agree with collocated results
from ACE-FTS and MLS/Aura to within ∼ 5 %. A significant positive
linear change in water vapour for the time 2003–2011 is observed at lower
stratospheric altitudes with a value of about 0.015 ± 0.008 ppmv year−1
around 17 km. Between 30 and
37 km the changes become significantly negative (about −0.01 ± 0.008 ppmv year−1); all errors are 2σ values. The combined analysis of the SCIAMACHY methane and water vapour time series
shows the expected anti-correlation between stratospheric methane and water
vapour and a clear temporal variation related to the Quasi-Biennial Oscillation
(QBO).
Above about 20 km most of the additional water vapour is attributed to the
oxidation of methane.
In addition short-term fluctuations and longer-term variations on a timescale
of 5–6 years are observed.
The SCIAMACHY data confirm that at lower altitudes the amount of water vapour
and methane are transported from the tropics to higher latitudes via the
shallow branch of the Brewer–Dobson circulation.
Funder
Deutsches Zentrum für Luft- und Raumfahrt European Space Agency
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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