English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. An improved stratospheric water vapour data set has been retrieved from SCIAMACHY/ENVISAT solaroccultation measurements. It is similar to that successfully applied tomethane and carbon dioxide. There is now a consistent set of data productsfor the three constituents covering the altitudes 17–45  km , thelatitude range between about 50 and 70 ∘  N, and the period August2002 to April 2012. The new water vapour concentration profiles agree with collocated resultsfrom ACE-FTS and MLS/Aura to within ∼  5 %. A significant positivelinear change in water vapour for the time 2003–2011 is observed at lowerstratospheric altitudes with a value of about 0.015  ±  0.008  ppmv year−1 around 17  km . Between 30 and37  km the changes become significantly negative (about − 0.01  ±  0.008  ppmv year−1 ); all errors are 2 σ values. The combined analysis of the SCIAMACHY methane and water vapour time seriesshows the expected anti-correlation between stratospheric methane and watervapour 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 theoxidation of methane.In addition short-term fluctuations and longer-term variations on a timescaleof 5–6 years are observed.The SCIAMACHY data confirm that at lower altitudes the amount of water vapourand methane are transported from the tropics to higher latitudes via theshallow branch of the Brewer–Dobson circulation.

Water vapour and methane coupling in the stratosphere observed using SCIAMACHY solar occultation measurements