Synoptic-scale controls of fog and low-cloud  variability in the Namib Desert

Andersen, Hendrik; Cermak, Jan; Fuchs, Julia; Knippertz, Peter; Gaetani, Marco; Quinting, Julian; Sippel, Sebastian; Vogt, Roland

doi:10.5194/acp-20-3415-2020

Articles | Volume 20, issue 6

https://doi.org/10.5194/acp-20-3415-2020

© Author(s) 2020. 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-20-3415-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 6

Research article

|

24 Mar 2020

Research article |

| 24 Mar 2020

Synoptic-scale controls of fog and low-cloud variability in the Namib Desert

Hendrik Andersen, Jan Cermak, Julia Fuchs, Peter Knippertz, Marco Gaetani, Julian Quinting, Sebastian Sippel, and Roland Vogt

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Nov 2019	64	12	1	77
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Jan 2020	27	10	0	37
Feb 2020	30	8	1	39
Mar 2020	182	54	3	239
Apr 2020	81	35	2	118
May 2020	43	17	0	60
Jun 2020	28	21	0	49
Jul 2020	38	20	7	65
Aug 2020	36	15	3	54
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Oct 2020	15	21	0	36
Nov 2020	9	4	0	13
Dec 2020	8	12	0	20
Jan 2021	19	16	0	35
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Mar 2021	32	13	0	45
Apr 2021	27	15	0	42
May 2021	92	17	1	110
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Jul 2021	20	14	0	34
Aug 2021	18	13	1	32
Sep 2021	21	17	0	38
Oct 2021	20	40	0	60
Nov 2021	117	50	2	169
Dec 2021	30	13	1	44
Jan 2022	11	6	0	17
Feb 2022	22	9	1	32
Mar 2022	25	15	0	40
Apr 2022	12	7	1	20
May 2022	5	6	0	11
Jun 2022	5	1	0	6
Jul 2022	30	4	0	34
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Nov 2022	24	10	1	35
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Jan 2023	18	12	0	30
Feb 2023	23	10	2	35
Mar 2023	27	12	2	41
Apr 2023	10	7	0	17
May 2023	17	16	0	33
Jun 2023	38	16	4	58
Jul 2023	15	11	1	27
Aug 2023	19	16	2	37
Sep 2023	43	6	2	51
Oct 2023	86	10	3	99
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Dec 2023	73	7	4	84
Jan 2024	23	5	1	29
Feb 2024	49	13	0	62
Mar 2024	36	25	4	65
Apr 2024	35	11	3	49
May 2024	67	13	4	84
Jun 2024	57	9	2	68
Jul 2024	393	10	2	405
Aug 2024	27	20	2	49
Sep 2024	18	11	0	29
Oct 2024	35	8	0	43
Nov 2024	10	10	3	23
Dec 2024	41	7	2	50
Jan 2025	37	13	6	56
Feb 2025	43	10	4	57
Mar 2025	33	9	0	42
Apr 2025	28	16	1	45
May 2025	51	7	0	58
Jun 2025	101	28	8	137
Jul 2025	56	18	2	76
Aug 2025	58	24	0	82
Sep 2025	216	12	2	230
Oct 2025	46	30	0	76
Nov 2025	120	18	2	140

Cumulative views and downloads (calculated since 14 Oct 2019)

Month	HTML	PDF	XML	Total
Oct 2019	116	28	2	146
Nov 2019	64	12	1	77
Dec 2019	19	9	0	28
Jan 2020	27	10	0	37
Feb 2020	30	8	1	39
Mar 2020	182	54	3	239
Apr 2020	81	35	2	118
May 2020	43	17	0	60
Jun 2020	28	21	0	49
Jul 2020	38	20	7	65
Aug 2020	36	15	3	54
Sep 2020	33	14	0	47
Oct 2020	15	21	0	36
Nov 2020	9	4	0	13
Dec 2020	8	12	0	20
Jan 2021	19	16	0	35
Feb 2021	24	14	0	38
Mar 2021	32	13	0	45
Apr 2021	27	15	0	42
May 2021	92	17	1	110
Jun 2021	43	24	0	67
Jul 2021	20	14	0	34
Aug 2021	18	13	1	32
Sep 2021	21	17	0	38
Oct 2021	20	40	0	60
Nov 2021	117	50	2	169
Dec 2021	30	13	1	44
Jan 2022	11	6	0	17
Feb 2022	22	9	1	32
Mar 2022	25	15	0	40
Apr 2022	12	7	1	20
May 2022	5	6	0	11
Jun 2022	5	1	0	6
Jul 2022	30	4	0	34
Aug 2022	108	4	1	113
Sep 2022	22	6	0	28
Oct 2022	13	5	1	19
Nov 2022	24	10	1	35
Dec 2022	14	5	0	19
Jan 2023	18	12	0	30
Feb 2023	23	10	2	35
Mar 2023	27	12	2	41
Apr 2023	10	7	0	17
May 2023	17	16	0	33
Jun 2023	38	16	4	58
Jul 2023	15	11	1	27
Aug 2023	19	16	2	37
Sep 2023	43	6	2	51
Oct 2023	86	10	3	99
Nov 2023	41	4	0	45
Dec 2023	73	7	4	84
Jan 2024	23	5	1	29
Feb 2024	49	13	0	62
Mar 2024	36	25	4	65
Apr 2024	35	11	3	49
May 2024	67	13	4	84
Jun 2024	57	9	2	68
Jul 2024	393	10	2	405
Aug 2024	27	20	2	49
Sep 2024	18	11	0	29
Oct 2024	35	8	0	43
Nov 2024	10	10	3	23
Dec 2024	41	7	2	50
Jan 2025	37	13	6	56
Feb 2025	43	10	4	57
Mar 2025	33	9	0	42
Apr 2025	28	16	1	45
May 2025	51	7	0	58
Jun 2025	101	28	8	137
Jul 2025	56	18	2	76
Aug 2025	58	24	0	82
Sep 2025	216	12	2	230
Oct 2025	46	30	0	76
Nov 2025	120	18	2	140

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Short summary

Fog and low clouds (FLCs) are an essential but poorly understood element of Namib regional climate. Here, a satellite-based data set of FLCs in central Namib, reanalysis data, and back trajectories are used to systematically analyze conditions when FLCs occur. Synoptic-scale mechanisms are identified that influence the formation of FLCs and the onshore advection of marine boundary-layer air masses. The findings lead to a new conceptual model of mechanisms that drive FLC variability in the Namib.


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