What controls the isotopic composition of the African monsoon precipitation ? Insights from event-based precipitation collected during the 2006 AMMA field campaign

Camille Risi 1 Sandrine Bony 1 Françoise Vimeux 2 Luc Descroix 3 Boubacar Ibrahim 1 Eric Lebreton I. Mamadou 4 Benjamin Sultan 5 Ibrahim Ibrahim 6
1 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
2 GREATICE - Glaciers et ressources en eau d'altitude - Indicateurs climatiques et environnementaux
3 LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
4 LGP - Laboratoire de géographie physique : Environnements Quaternaires et Actuels
5 LOCEAN - Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
6 Helwan University [Caire]
Abstract : [1] The stable isotopic composition of the tropical precipitation constitutes a useful tool for paleoclimate reconstructions and to better constrain the water cycle. To better understand what controls the isotopic composition of tropical precipitation, we analyze the d 18 O and deuterium-excess of the precipitation of individual events collected in the Niamey area (Niger) during the monsoon season, as part of the 2006 AMMA field campaign. During the monsoon onset, the abrupt increase of convective activity over the Sahel is associated with an abrupt change in the isotopic composition. Before the onset, when convective activity is scarce, the rain composition records the intensity and the organization of individual convective systems. After the onset, on the contrary, it records a regional-scale intra-seasonal variability over the Sahel, by integrating convective activity both spatially and temporally over the previous days.
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Camille Risi, Sandrine Bony, Françoise Vimeux, Luc Descroix, Boubacar Ibrahim, et al.. What controls the isotopic composition of the African monsoon precipitation ? Insights from event-based precipitation collected during the 2006 AMMA field campaign. Geophysical Research Letters, American Geophysical Union, 2008, 35 (24), ⟨10.1029/2008GL035920⟩. ⟨ird-02153494⟩

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