Sensitivity analysis of an aerosol-aware microphysics scheme in Weather Research and Forecasting (WRF)  during case studies of fog in Namibia

Weston, Michael John; Piketh, Stuart John; Burnet, Frédéric; Broccardo, Stephen; Denjean, Cyrielle; Bourrianne, Thierry; Formenti, Paola

doi:https://doi.org/10.5194/acp-22-10221-2022

Articles | Volume 22, issue 15

https://doi.org/10.5194/acp-22-10221-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

New observations and related modelling studies of the aerosol–cloud–climate...

https://doi.org/10.5194/acp-22-10221-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 22, issue 15

Research article

|

10 Aug 2022

Research article |

| 10 Aug 2022

Sensitivity analysis of an aerosol-aware microphysics scheme in Weather Research and Forecasting (WRF) during case studies of fog in Namibia

Michael John Weston, Stuart John Piketh, Frédéric Burnet, Stephen Broccardo, Cyrielle Denjean, Thierry Bourrianne, and Paola Formenti

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Cumulative views and downloads (calculated since 16 Mar 2022)

Month	HTML	PDF	XML	Total
Mar 2022	140	39	4	183
Apr 2022	76	34	6	116
May 2022	22	7	2	31
Jun 2022	33	15	6	54
Jul 2022	10	9	0	19
Aug 2022	353	74	6	433
Sep 2022	110	30	0	140
Oct 2022	76	17	0	93
Nov 2022	95	18	0	113
Dec 2022	64	12	0	76
Jan 2023	29	13	0	42
Feb 2023	35	22	0	57
Mar 2023	35	29	2	66
Apr 2023	20	20	0	40
May 2023	36	23	0	59
Jun 2023	25	11	1	37
Jul 2023	29	24	1	54
Aug 2023	42	28	2	72
Sep 2023	49	16	2	67
Oct 2023	54	33	1	88
Nov 2023	36	12	0	48
Dec 2023	31	12	0	43
Jan 2024	23	14	0	37
Feb 2024	27	11	2	40
Mar 2024	43	37	1	81
Apr 2024	20	10	1	31

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Short summary

An aerosol-aware microphysics scheme is evaluated for fog cases in Namibia. AEROCLO-sA campaign observations are used to access and parameterise the model. The model cloud condensation nuclei activation is lower than the observations. The scheme is designed for clouds with updrafts, while fog typically forms in stable conditions. A pseudo updraft speed assigned to the lowest model levels helps achieve more realistic cloud droplet number concentration and size distribution in the model.