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Journal Article: BibTeX citation key:  Kafando2015
Kafando, P., Chane Ming, F. & Petitdidier, M. (2015) Stratospheric variability of wave activity and parameters in equatorial coastal and tropical sites during the West African monsoon. IN Climate Dynamics, .
Added by: Fabrice Chane Ming 2015-09-15 15:24:00
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Categories: Monsoon system and its variability
Keywords: Dynamics
Creators: Chane Ming, Kafando, Petitdidier
Collection: Climate Dynamics

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Abstract
Recent numerical studies in stratospheric
dynamics and its variability as well as climate, have
highlighted the need of more observational analyses
to improve simulation of the West African monsoon
(WAM). In this paper, activity and spectral characteristics
of short-scale vertical waves (wavelengths <4 km) are
analysed in equatorial coastal and tropical lower stratosphere during the WAM. A first detailed description of
such waves over West Africa is derived from high-resolution vertical profiles of temperature and horizontal wind
obtained during Intensive Observation Period of the African Monsoon Multidisciplinary Analyses (AMMA) Campaign 2006. Monthly variation of wave energy density is
revealed to trace the progression of the inter-tropical convergence zone (ITCZ) over West Africa. Mesoscale inertia gravity-waves structures with vertical and horizontal
wavelengths of 1.5–2.5 and 400–1100 km respectively
and intrinsic frequencies of 1.1–2.2 f or periods <2 days
Added by: Fabrice Chane Ming