Dataset Information

A meteorological dataset of the West African monsoon during the 2016 DACCIWA campaign.

ABSTRACT: As part of the Dynamics-Aerosol-Chemistry-Cloud Interactions in West Africa (DACCIWA) project, extensive in-situ measurements of the southern West African atmospheric boundary layer (ABL) have been performed at three supersites Kumasi (Ghana), Savè (Benin) and Ile-Ife (Nigeria) during the 2016 monsoon period (June and July). The measurements were designed to provide data for advancing our understanding of the relevant processes governing the formation, persistence and dissolution of nocturnal low-level stratus clouds and their influence on the daytime ABL in southern West Africa. An extensive low-level cloud deck often forms during the night and persists long into the following day strongly influencing the ABL diurnal cycle. Although the clouds are of a high significance for the regional climate, the dearth of observations in this region has hindered process understanding. Here, an overview of the measurements ranging from near-surface observations, cloud characteristics, aerosol and precipitation to the dynamics and thermodynamics in the ABL and above, and data processing is given. So-far achieved scientific findings, based on the dataset analyses, are briefly overviewed.

SUBMITTER: Kohler M

PROVIDER: S-EPMC9010450 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature

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A meteorological dataset of the West African monsoon during the 2016 DACCIWA campaign.

Kohler Martin M Bessardon Geoffrey G Brooks Barbara B Kalthoff Norbert N Lohou Fabienne F Adler Bianca B Olawale Jegede Oluwagbemiga O Altstädter Barbara B Amekudzi Leonard Kofitse LK Aryee Jeffrey Nii Armah JNA Atiah Winifred Ayinpogbilla WA Ayoola Muritala M Babić Karmen K Bärfuss Konrad K Bezombes Yannick Y Bret Guillaume G Brilouet Pierre-Etienne PE Cayle-Aethelhard Fred F Danuor Sylvester S Delon Claire C Derrien Solene S Dione Cheikh C Durand Pierre P Fosu-Amankwah Kwabena K Gabella Omar O Groves James J Handwerker Jan J Jambert Corinne C Kunka Norbert N Lampert Astrid A Leclercq Jérémy J Lothon Marie M Medina Patrice P Miere Arnaud A Pätzold Falk F Pedruzo-Bagazgoitia Xabier X Reinares Martínez Irene I Sharpe Steven S Smith Victoria V Wieser Andreas A

Scientific data 20220414 1

As part of the Dynamics-Aerosol-Chemistry-Cloud Interactions in West Africa (DACCIWA) project, extensive in-situ measurements of the southern West African atmospheric boundary layer (ABL) have been performed at three supersites Kumasi (Ghana), Savè (Benin) and Ile-Ife (Nigeria) during the 2016 monsoon period (June and July). The measurements were designed to provide data for advancing our understanding of the relevant processes governing the formation, persistence and dissolution of nocturnal lo ...[more]

PMID: 35422487

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Project description:The second West African Monsoon Modeling and Evaluation Project Experiment (WAMME II) is designed to improve understanding of the possible roles and feedbacks of sea surface temperature (SST), land use land cover change (LULCC), and aerosols forcings in the Sahel climate system at seasonal to decadal scales. The project's strategy is to apply prescribed observationally based anomaly forcing, i.e., "idealized but realistic" forcing, in simulations by climate models. The goal is to assess these forcings' effects in producing/amplifying seasonal and decadal climate variability in the Sahel between the 1950s and the 1980s, which is selected to characterize the great drought period of the last century. This is the first multi-model experiment specifically designed to simultaneously evaluate such relative contributions. The WAMME II models have consistently demonstrated that SST forcing is a major contributor to the 20th century Sahel drought. Under the influence of the maximum possible SST forcing, the ensemble mean of WAMME II models can produce up to 60% of the precipitation difference during the period. The present paper also addresses the role of SSTs in triggering and maintaining the Sahel drought. In this regard, the consensus of WAMME II models is that both Indian and Pacific Ocean SSTs greatly contributed to the drought, with the former producing an anomalous displacement of the Intertropical Convergence Zone (ITCZ) before the WAM onset, and the latter mainly contributes to the summer WAM drought. The WAMME II models also show that the impact of LULCC forcing on the Sahel climate system is weaker than that of SST forcing, but still of first order magnitude. According to the results, under LULCC forcing the ensemble mean of WAMME II models can produces about 40% of the precipitation difference between the 1980s and the 1950s. The role of land surface processes in responding to and amplifying the drought is also identified. The results suggest that catastrophic consequences are likely to occur in the regional Sahel climate when SST anomalies in individual ocean basins and in land conditions combine synergistically to favor drought.

Dataset Information

A meteorological dataset of the West African monsoon during the 2016 DACCIWA campaign.

Publications

A meteorological dataset of the West African monsoon during the 2016 DACCIWA campaign.

Similar Datasets

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