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Overview of the DACCIWA ground-based field campaign in southern West Africa

During June and July 2016, a ground-based field campaign took place in southern West Africa within the frame- work of the Dynamics-aerosol-chemistry-cloud interactions in West Africa (DACCIWA) project. In the investi- gated region, extended low-level stratus clouds form very frequently during night-time and persist long into the following day influencing the diurnal cycle of the atmospheric boundary layer and, hence, the regional climate. The motivation for the measurements was to identify the meteorological controls on the whole process chain from the formation of nocturnal stratus clouds, via the daytime transition to convective clouds and the formation of deep precipitating clouds. During the measurement period, extensive remote sensing and in-situ measurements were performed at three supersites in Kumasi (Ghana), Savè (Benin) and Ile-Ife (Nigeria). The gathered obser- vations included the energy-balance components at the Earth’s surface, the mean and turbulent conditions in the nocturnal and daytime ABL as well as the de- and entrainment processes between the ABL and the free tropo- sphere. The meteorological measurements were supplemented by aerosol and air-chemistry observations. We will give an overview of the conducted measurements including instrument availability and strategy during intensive observation periods.

DACCIWA ; West Africa ; low-level clouds ; field campaign

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