Optical and geometrical properties of cirrus clouds in Amazonia derived from 1 year of ground-based lidar measurements

Gouveia, Diego A.; Barja, Boris; Barbosa, Henrique M. J.; Seifert, Patric; Baars, Holger; Pauliquevis, Theotonio; Artaxo, Paulo

doi:https://doi.org/10.5194/acp-17-3619-2017

Articles | Volume 17, issue 5

https://doi.org/10.5194/acp-17-3619-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue:

Observations and Modeling of the Green Ocean Amazon (GoAmazon2014/5)...

https://doi.org/10.5194/acp-17-3619-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 17, issue 5

Research article

|

15 Mar 2017

Research article |

| 15 Mar 2017

Optical and geometrical properties of cirrus clouds in Amazonia derived from 1 year of ground-based lidar measurements

Diego A. Gouveia, Boris Barja, Henrique M. J. Barbosa, Patric Seifert, Holger Baars, Theotonio Pauliquevis, and Paulo Artaxo

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Month	HTML	PDF	XML	Total
Jun 2016	43	18	1	62
Jul 2016	18	3	1	22
Aug 2016	13	9	2	24
Sep 2016	30	6	0	36
Oct 2016	6	4	3	13
Nov 2016	5	2	0	7
Dec 2016	3	1	0	4
Jan 2017	18	5	2	25
Feb 2017	19	3	2	24
Mar 2017	247	87	9	343
Apr 2017	60	44	2	106
May 2017	51	32	2	85
Jun 2017	32	27	1	60
Jul 2017	22	16	0	38
Aug 2017	22	22	0	44
Sep 2017	16	25	1	42
Oct 2017	17	17	0	34
Nov 2017	21	15	0	36
Dec 2017	14	13	0	27
Jan 2018	35	20	2	57
Feb 2018	199	11	1	211
Mar 2018	168	14	2	184
Apr 2018	108	9	0	117
May 2018	14	12	0	26
Jun 2018	14	18	0	32
Jul 2018	8	12	4	24
Aug 2018	23	15	0	38
Sep 2018	10	15	4	29
Oct 2018	14	9	4	27
Nov 2018	19	13	6	38
Dec 2018	8	6	2	16
Jan 2019	10	9	0	19
Feb 2019	11	4	1	16
Mar 2019	11	11	1	23
Apr 2019	11	7	0	18
May 2019	4	11	2	17
Jun 2019	11	10	1	22
Jul 2019	6	8	0	14
Aug 2019	6	7	1	14
Sep 2019	7	9	0	16
Oct 2019	7	6	2	15
Nov 2019	9	9	0	18
Dec 2019	12	8	0	20
Jan 2020	8	11	0	19
Feb 2020	10	4	1	15
Mar 2020	8	6	0	14
Apr 2020	12	11	0	23
May 2020	11	7	1	19
Jun 2020	17	12	0	29
Jul 2020	13	14	6	33
Aug 2020	13	13	2	28
Sep 2020	11	5	2	18
Oct 2020	6	10	1	17
Nov 2020	8	3	0	11
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Jan 2021	11	6	0	17
Feb 2021	6	4	0	10
Mar 2021	7	5	1	13
Apr 2021	10	8	0	18
May 2021	10	5	1	16
Jun 2021	9	3	1	13
Jul 2021	6	7	0	13
Aug 2021	7	5	0	12
Sep 2021	11	14	0	25
Oct 2021	7	39	0	46
Nov 2021	15	28	2	45
Dec 2021	20	9	0	29
Jan 2022	10	8	0	18
Feb 2022	9	6	3	18
Mar 2022	10	9	0	19
Apr 2022	10	8	1	19
May 2022	4	8	1	13
Jun 2022	4	4	0	8
Jul 2022	4	3	0	7
Aug 2022	17	4	1	22
Sep 2022	9	6	0	15
Oct 2022	8	4	2	14
Nov 2022	14	10	1	25
Dec 2022	23	9	1	33
Jan 2023	8	12	0	20
Feb 2023	18	11	1	30
Mar 2023	22	13	2	37
Apr 2023	13	17	0	30
May 2023	33	13	0	46
Jun 2023	45	5	1	51
Jul 2023	41	16	2	59
Aug 2023	41	14	2	57
Sep 2023	54	7	0	61
Oct 2023	56	13	3	72
Nov 2023	43	6	0	49
Dec 2023	41	14	1	56
Jan 2024	40	24	0	64
Feb 2024	54	18	0	72
Mar 2024	49	15	1	65
Apr 2024	63	7	3	73
May 2024	33	17	3	53
Jun 2024	24	11	1	36
Jul 2024	22	11	5	38
Aug 2024	27	6	3	36
Sep 2024	15	6	0	21
Oct 2024	27	11	2	40
Nov 2024	13	5	2	20
Dec 2024	19	6	1	26
Jan 2025	19	7	4	30
Feb 2025	46	18	1	65
Mar 2025	17	16	0	33
Apr 2025	35	18	2	55
May 2025	34	14	0	48
Jun 2025	55	15	5	75
Jul 2025	25	22	1	48
Aug 2025	57	28	4	89
Sep 2025	74	12	2	88
Oct 2025	45	21	0	66
Nov 2025	10	3	0	13

Cumulative views and downloads (calculated since 22 Jun 2016)

Month	HTML	PDF	XML	Total
Jun 2016	43	18	1	62
Jul 2016	18	3	1	22
Aug 2016	13	9	2	24
Sep 2016	30	6	0	36
Oct 2016	6	4	3	13
Nov 2016	5	2	0	7
Dec 2016	3	1	0	4
Jan 2017	18	5	2	25
Feb 2017	19	3	2	24
Mar 2017	247	87	9	343
Apr 2017	60	44	2	106
May 2017	51	32	2	85
Jun 2017	32	27	1	60
Jul 2017	22	16	0	38
Aug 2017	22	22	0	44
Sep 2017	16	25	1	42
Oct 2017	17	17	0	34
Nov 2017	21	15	0	36
Dec 2017	14	13	0	27
Jan 2018	35	20	2	57
Feb 2018	199	11	1	211
Mar 2018	168	14	2	184
Apr 2018	108	9	0	117
May 2018	14	12	0	26
Jun 2018	14	18	0	32
Jul 2018	8	12	4	24
Aug 2018	23	15	0	38
Sep 2018	10	15	4	29
Oct 2018	14	9	4	27
Nov 2018	19	13	6	38
Dec 2018	8	6	2	16
Jan 2019	10	9	0	19
Feb 2019	11	4	1	16
Mar 2019	11	11	1	23
Apr 2019	11	7	0	18
May 2019	4	11	2	17
Jun 2019	11	10	1	22
Jul 2019	6	8	0	14
Aug 2019	6	7	1	14
Sep 2019	7	9	0	16
Oct 2019	7	6	2	15
Nov 2019	9	9	0	18
Dec 2019	12	8	0	20
Jan 2020	8	11	0	19
Feb 2020	10	4	1	15
Mar 2020	8	6	0	14
Apr 2020	12	11	0	23
May 2020	11	7	1	19
Jun 2020	17	12	0	29
Jul 2020	13	14	6	33
Aug 2020	13	13	2	28
Sep 2020	11	5	2	18
Oct 2020	6	10	1	17
Nov 2020	8	3	0	11
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Apr 2021	10	8	0	18
May 2021	10	5	1	16
Jun 2021	9	3	1	13
Jul 2021	6	7	0	13
Aug 2021	7	5	0	12
Sep 2021	11	14	0	25
Oct 2021	7	39	0	46
Nov 2021	15	28	2	45
Dec 2021	20	9	0	29
Jan 2022	10	8	0	18
Feb 2022	9	6	3	18
Mar 2022	10	9	0	19
Apr 2022	10	8	1	19
May 2022	4	8	1	13
Jun 2022	4	4	0	8
Jul 2022	4	3	0	7
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Sep 2022	9	6	0	15
Oct 2022	8	4	2	14
Nov 2022	14	10	1	25
Dec 2022	23	9	1	33
Jan 2023	8	12	0	20
Feb 2023	18	11	1	30
Mar 2023	22	13	2	37
Apr 2023	13	17	0	30
May 2023	33	13	0	46
Jun 2023	45	5	1	51
Jul 2023	41	16	2	59
Aug 2023	41	14	2	57
Sep 2023	54	7	0	61
Oct 2023	56	13	3	72
Nov 2023	43	6	0	49
Dec 2023	41	14	1	56
Jan 2024	40	24	0	64
Feb 2024	54	18	0	72
Mar 2024	49	15	1	65
Apr 2024	63	7	3	73
May 2024	33	17	3	53
Jun 2024	24	11	1	36
Jul 2024	22	11	5	38
Aug 2024	27	6	3	36
Sep 2024	15	6	0	21
Oct 2024	27	11	2	40
Nov 2024	13	5	2	20
Dec 2024	19	6	1	26
Jan 2025	19	7	4	30
Feb 2025	46	18	1	65
Mar 2025	17	16	0	33
Apr 2025	35	18	2	55
May 2025	34	14	0	48
Jun 2025	55	15	5	75
Jul 2025	25	22	1	48
Aug 2025	57	28	4	89
Sep 2025	74	12	2	88
Oct 2025	45	21	0	66
Nov 2025	10	3	0	13

Latest update: 07 Nov 2025

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Short summary

We derive the first comprehensive statistics of cirrus clouds over a tropical rain forest. Monthly frequency of occurrence can be as high as 88 %. The diurnal cycle follows that of precipitation, and frequently cirrus is found in the tropopause layer. The mean values of cloud top, base, thickness, optical depth and lidar ratio were 14.3 km, 12.9 km, 1.4 km, 0.25, and 23 sr respectively. The high fraction (42 %) of subvisible clouds may contaminate satellite measurements to an unknown extent.