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Detecting moisture transport pathways to the subtropical North Atlantic free troposphere using paired H2O-δD in situ measurements

González, Yenny; Schneider, Matthias 1; Dyroff, Christoph 1; Rodríguez, Sergio; Christner, Emanuel 1; García, Omaira Elena; Cuevas, Emilio; Bustos, Juan Jose; Ramos, Ramon; Guirado-Fuentes, Carmen; Barthlott, Sabine ORCID iD icon 1; Wiegele, Andreas 1; Sepúlveda, Eliezer
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF), Karlsruher Institut für Technologie (KIT)


We present two years of in situ measurements of water vapour (H$_{2}$O) and its isotopologue ratio (δD, the standardized ratio between H$_{2}$$^{16}$O and HD$^{16}$O), made at two remote mountain sites on Tenerife in the subtropical North Atlantic. We show that the data – if measured during night-time – are well representative for the lower/middle free troposphere. We use the measured H$_{2}$O-δD pairs, together with dust measurements and back trajectory modelling for analysing the moisture pathways to this region. We can identify four principally different transport pathways. The air mass transport from high altitudes and high latitudes shows two different scenarios. The first scenario brings dry air masses to the stations, as the result of condensation events occurring at low temperatures. The second scenario brings humid air masses to the stations, due to cross-isentropic mixing with lower-level and more humid air during transport since last condensation (LC). The third pathway is transportation from lower latitudes and lower altitudes, whereby we can identify rain re-evaporation as an occasional source of moisture. The fourth pathway is linked to the African continent, where during summer, dry convection processes over the Sahara very effectively inject humidity from the boundary layer to higher altitudes. ... mehr

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DOI: 10.5445/IR/1000055545
DOI: 10.5194/acp-16-4251-2016
Zitationen: 26
Web of Science
Zitationen: 26
Zitationen: 27
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 1680-7316
KITopen-ID: 1000055545
HGF-Programm 12.03.01 (POF III, LK 01) Long term observations of tropospheric
Erschienen in Atmospheric Chemistry and Physics
Verlag European Geosciences Union (EGU)
Band 16
Heft 7
Seiten 4251-4269
Nachgewiesen in Dimensions
Web of Science
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