Dynamics-aerosol-chemistry-cloud interactions in West Africa
Public Deliverables
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iid 1079
Name D1.1 Campaign (Boundary Layer Dynamics)
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Deliverable Category Boundary Layer Dynamics
Summary The document gives an overview of the conducted measurements including instrument availability and intensive observation period (IOP) overview, aims to inform data users and provides support for case study selection.
Full Information This report provides a summary document for the ground-based field campaign which took place during June and July 2016. The field campaign was conducted to address the scientific objectives of WP1: the structure of the atmospheric boundary layer (ABL) depends mainly on the energy exchange at the Earth’s surface. However, due to the high natural and anthropogenic emissions in Southwest Africa, gaseous and aerosol air pollutants also affect the diurnal cycle of the ABL, as do sea breeze and monsoon flows from the Gulf of Guinea. Characteristic features, for example nocturnal low-level jet (LLJs), deep daytime ABLs, and various types of boundary-layer clouds often occur. During the course of the day a transition from nocturnal low-level stratus to stratocumulus, cumulus, and sometimes congestus and possibly cumulonimbus clouds is observed. The atmospheric processes driving this transition are sensitive to the conditions mentioned above and although the nocturnal low-level stratus and the transition to broken clouds appear quite frequently, little attention has been paid to the phenomenon so far. In WP1 the intention is 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 observations 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 troposphere. The meteorological measurements were supplemented by aerosol and air chemical observations.
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