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Low atmospheric dynamics and low-level cloud (LLC) macrophysical properties are analyzed using in situ and remote sensing data collected from 20 June to 30 July at Savè, Benin, during the DACCIWA field campaign in 2016. We find that the low-level jet (LLJ), LLCs, monsoon flow, and maritime inflow reveal a day-to-day variability. LLCs form at the same level as the jet core height. The cloud base height is stationary at night and remains below the jet. The cloud top height is found above the jet.
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ACP | Articles | Volume 19, issue 13
Atmos. Chem. Phys., 19, 8979–8997, 2019
https://doi.org/10.5194/acp-19-8979-2019

Special issue: Results of the project "Dynamics–aerosol–chemistry–cloud...

Atmos. Chem. Phys., 19, 8979–8997, 2019
https://doi.org/10.5194/acp-19-8979-2019

Research article 16 Jul 2019

Research article | 16 Jul 2019

Low-level stratiform clouds and dynamical features observed within the southern West African monsoon

Cheikh Dione et al.

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Abdou, K., Parker, D. J., Brooks, B., Kalthoff, N., and Lebel, T.: The diurnal cycle of lower boundary-layer wind in the West African monsoon, Q. J. Roy. Meteor. Soc., 136, 66–76, https://doi.org/10.1002/qj.536, 2010. a
Adler, B., Kalthoff, N., and Gantner, L.: Nocturnal low-level clouds over southern West Africa analysed using high-resolution simulations, Atmos. Chem. Phys., 17, 899-910, https://doi.org/10.5194/acp-17-899-2017, 2017. a, b
Adler, B., Babić, K., Kalthoff, N., Lohou, F., Lothon, M., Dione, C., Pedruzo-Bagazgoitia, X., and Andersen, H.: Nocturnal low-level clouds in the atmospheric boundary layer over southern West Africa: an observation-based analysis of conditions and processes, Atmos. Chem. Phys., 19, 663–681, https://doi.org/10.5194/acp-19-663-2019, 2019. a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p
Andreas, E. L., Claffey, K. J., and Makshtas, A. P.: Low-level atmospheric jets and inversions over the Western Weddell Sea, Bound.-Lay. Meteorol., 97, 459–486, 2000. a
Baas, P., Bosveld, C., and Klein Baltink, H.,and Holtlag, A. A. M.: A climatology of Nocturnal Low-Level Jets at more frequent occurrence of the LLC during the monsoon Cabauw, J. Appl. Meteorol. Clim., 48, 1627–1642, 2009. a
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Short summary
Low atmospheric dynamics and low-level cloud (LLC) macrophysical properties are analyzed using in situ and remote sensing data collected from 20 June to 30 July at Savè, Benin, during the DACCIWA field campaign in 2016. We find that the low-level jet (LLJ), LLCs, monsoon flow, and maritime inflow reveal a day-to-day variability. LLCs form at the same level as the jet core height. The cloud base height is stationary at night and remains below the jet. The cloud top height is found above the jet.
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