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Titel Quantification of the fraction of recycled moisture at the forested southern slopes of Kilimanjaro (Tanzania)
VerfasserIn Insa Otte, Florian Detsch, Thomas Nauss, Tim Appelhans
Konferenz EGU General Assembly 2016
Medientyp Artikel
Sprache en
Digitales Dokument PDF
Erschienen In: GRA - Volume 18 (2016)
Datensatznummer 250133365
Publikation (Nr.) Volltext-Dokument vorhandenEGU/EGU2016-13969.pdf
 
Zusammenfassung
Understanding the isotopic variability of oxygen (δ18O) and hydrogen (δD) of precipitation has become essential for determining sources of precipitation by using the stable isotope composition as hydrological tracer. Isotopic composition of precipitation was collected weekly for a period of two years along an elevation (950 to 3,880 m a.s.l.) and disturbance transect at the southern slopes of Mt. Kilimanjaro, resulting in 2,156 samples. Additionally, two intensive sampling campaigns have been conducted during the transition between dry and wet season. The research area is characterized by a bimodal rainfall regime with two distinct rainy seasons, the "long rains" from March to May and the "short rains" from October to December. Results from a previous study revealed mixed isotopic signals in precipitation that are interpreted as different moisture sources. This study analysis the fraction of recycled moisture at the forested southern slopes of Kilimanjaro with a modified Craig-Gordon model to assess the contributions of (i) regional (advection) and (ii) local (transpiration and evaporation) moisture sources. The seasonal variations in δ18O and deuterium excess are caused by the variations in precipitation sources. Results indicates that transpiration contributes for the majority of recycled moisture whereas evaporation accounts to a lesser extent to the local precipitation sources.