On the hiatus in the acceleration of tropical upwelling since the beginning of the 21st century

Aschmann, J.; Burrows, J. P.; Gebhardt, C.; Rozanov, A.; Hommel, R.; Weber, M.; Thompson, A. M.

doi:10.5194/acp-14-12803-2014

Articles | Volume 14, issue 23

https://doi.org/10.5194/acp-14-12803-2014

© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/acp-14-12803-2014

© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 14, issue 23

Research article

|

05 Dec 2014

Research article |

| 05 Dec 2014

On the hiatus in the acceleration of tropical upwelling since the beginning of the 21st century

J. Aschmann, J. P. Burrows, C. Gebhardt, A. Rozanov, R. Hommel, M. Weber, and A. M. Thompson

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Total article views: 4,827 (including HTML, PDF, and XML)

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Views and downloads (calculated since 17 Apr 2014)

Month	HTML	PDF	XML	Total
Apr 2014	76	54	1	131
May 2014	46	51	6	103
Jun 2014	16	24	4	44
Jul 2014	14	13	0	27
Aug 2014	12	14	3	29
Sep 2014	20	17	3	40
Oct 2014	19	13	0	32
Nov 2014	17	21	4	42
Dec 2014	256	87	6	349
Jan 2015	65	38	2	105
Feb 2015	26	16	0	42
Mar 2015	28	10	2	40
Apr 2015	26	8	2	36
May 2015	17	19	2	38
Jun 2015	40	9	4	53
Jul 2015	29	11	3	43
Aug 2015	14	10	2	26
Sep 2015	11	15	1	27
Oct 2015	25	13	0	38
Nov 2015	36	25	7	68
Dec 2015	6	39	5	50
Jan 2016	33	20	2	55
Feb 2016	30	7	2	39
Mar 2016	18	9	0	27
Apr 2016	10	8	0	18
May 2016	10	3	0	13
Jun 2016	7	7	1	15
Jul 2016	11	2	2	15
Aug 2016	9	5	0	14
Sep 2016	15	7	0	22
Oct 2016	11	1	0	12
Nov 2016	9	1	0	10
Dec 2016	3	0	3
Jan 2017	15	3	1	19
Feb 2017	11	5	0	16
Mar 2017	20	12	1	33
Apr 2017	26	14	0	40
May 2017	44	8	0	52
Jun 2017	26	12	2	40
Jul 2017	15	4	0	19
Aug 2017	6	7	1	14
Sep 2017	12	8	0	20
Oct 2017	5	9	0	14
Nov 2017	5	9	3	17
Dec 2017	7	12	0	19
Jan 2018	6	8	0	14
Feb 2018	12	5	1	18
Mar 2018	13	11	0	24
Apr 2018	10	7	0	17
May 2018	13	7	0	20
Jun 2018	5	13	0	18
Jul 2018	6	8	0	14
Aug 2018	14	8	0	22
Sep 2018	11	13	0	24
Oct 2018	15	9	6	30
Nov 2018	17	10	1	28
Dec 2018	14	7	1	22
Jan 2019	5	12	1	18
Feb 2019	7	6	0	13
Mar 2019	8	10	0	18
Apr 2019	8	9	0	17
May 2019	8	7	0	15
Jun 2019	8	5	0	13
Jul 2019	4	7	0	11
Aug 2019	8	5	0	13
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Oct 2019	9	3	1	13
Nov 2019	9	7	0	16
Dec 2019	12	3	2	17
Jan 2020	12	8	0	20
Feb 2020	8	3	0	11
Mar 2020	2	4	0	6
Apr 2020	2	4	1	7
May 2020	6	4	0	10
Jun 2020	15	4	1	20
Jul 2020	20	6	5	31
Aug 2020	21	8	5	34
Sep 2020	14	4	0	18
Oct 2020	22	6	1	29
Nov 2020	16	10	4	30
Dec 2020	23	9	0	32
Jan 2021	28	7	2	37
Feb 2021	27	5	0	32
Mar 2021	35	9	0	44
Apr 2021	36	8	1	45
May 2021	33	8	1	42
Jun 2021	20	9	0	29
Jul 2021	26	12	0	38
Aug 2021	30	8	1	39
Sep 2021	33	40	0	73
Oct 2021	25	35	0	60
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Dec 2021	13	4	1	18
Jan 2022	20	11	0	31
Feb 2022	16	2	1	19
Mar 2022	11	4	1	16
Apr 2022	12	3	2	17
May 2022	6	5	0	11
Jun 2022	14	2	2	18
Jul 2022	8	3	0	11
Aug 2022	18	4	0	22
Sep 2022	4	2	0	6
Oct 2022	14	6	4	24
Nov 2022	17	4	0	21
Dec 2022	12	6	0	18
Jan 2023	7	12	1	20
Feb 2023	14	3	0	17
Mar 2023	13	11	0	24
Apr 2023	16	11	1	28
May 2023	32	9	1	42
Jun 2023	36	4	1	41
Jul 2023	41	8	1	50
Aug 2023	45	10	3	58
Sep 2023	39	9	1	49
Oct 2023	45	9	2	56
Nov 2023	25	0	25
Dec 2023	51	5	5	61
Jan 2024	46	1	1	48
Feb 2024	46	6	3	55
Mar 2024	53	13	2	68
Apr 2024	48	7	3	58
May 2024	24	16	1	41
Jun 2024	22	8	1	31
Jul 2024	12	14	4	30
Aug 2024	37	8	1	46
Sep 2024	22	4	0	26
Oct 2024	19	4	0	23
Nov 2024	12	3	2	17
Dec 2024	14	10	3	27
Jan 2025	28	6	7	41
Feb 2025	37	5	2	44
Mar 2025	36	8	7	51
Apr 2025	23	11	1	35
May 2025	35	8	0	43
Jun 2025	54	6	0	60
Jul 2025	40	15	1	56
Aug 2025	62	9	2	73
Sep 2025	79	11	2	92
Oct 2025	27	12	0	39
Nov 2025	32	21	3	56

Cumulative views and downloads (calculated since 17 Apr 2014)

Month	HTML	PDF	XML	Total
Apr 2014	76	54	1	131
May 2014	46	51	6	103
Jun 2014	16	24	4	44
Jul 2014	14	13	0	27
Aug 2014	12	14	3	29
Sep 2014	20	17	3	40
Oct 2014	19	13	0	32
Nov 2014	17	21	4	42
Dec 2014	256	87	6	349
Jan 2015	65	38	2	105
Feb 2015	26	16	0	42
Mar 2015	28	10	2	40
Apr 2015	26	8	2	36
May 2015	17	19	2	38
Jun 2015	40	9	4	53
Jul 2015	29	11	3	43
Aug 2015	14	10	2	26
Sep 2015	11	15	1	27
Oct 2015	25	13	0	38
Nov 2015	36	25	7	68
Dec 2015	6	39	5	50
Jan 2016	33	20	2	55
Feb 2016	30	7	2	39
Mar 2016	18	9	0	27
Apr 2016	10	8	0	18
May 2016	10	3	0	13
Jun 2016	7	7	1	15
Jul 2016	11	2	2	15
Aug 2016	9	5	0	14
Sep 2016	15	7	0	22
Oct 2016	11	1	0	12
Nov 2016	9	1	0	10
Dec 2016	3	0	3
Jan 2017	15	3	1	19
Feb 2017	11	5	0	16
Mar 2017	20	12	1	33
Apr 2017	26	14	0	40
May 2017	44	8	0	52
Jun 2017	26	12	2	40
Jul 2017	15	4	0	19
Aug 2017	6	7	1	14
Sep 2017	12	8	0	20
Oct 2017	5	9	0	14
Nov 2017	5	9	3	17
Dec 2017	7	12	0	19
Jan 2018	6	8	0	14
Feb 2018	12	5	1	18
Mar 2018	13	11	0	24
Apr 2018	10	7	0	17
May 2018	13	7	0	20
Jun 2018	5	13	0	18
Jul 2018	6	8	0	14
Aug 2018	14	8	0	22
Sep 2018	11	13	0	24
Oct 2018	15	9	6	30
Nov 2018	17	10	1	28
Dec 2018	14	7	1	22
Jan 2019	5	12	1	18
Feb 2019	7	6	0	13
Mar 2019	8	10	0	18
Apr 2019	8	9	0	17
May 2019	8	7	0	15
Jun 2019	8	5	0	13
Jul 2019	4	7	0	11
Aug 2019	8	5	0	13
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Nov 2019	9	7	0	16
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Jan 2020	12	8	0	20
Feb 2020	8	3	0	11
Mar 2020	2	4	0	6
Apr 2020	2	4	1	7
May 2020	6	4	0	10
Jun 2020	15	4	1	20
Jul 2020	20	6	5	31
Aug 2020	21	8	5	34
Sep 2020	14	4	0	18
Oct 2020	22	6	1	29
Nov 2020	16	10	4	30
Dec 2020	23	9	0	32
Jan 2021	28	7	2	37
Feb 2021	27	5	0	32
Mar 2021	35	9	0	44
Apr 2021	36	8	1	45
May 2021	33	8	1	42
Jun 2021	20	9	0	29
Jul 2021	26	12	0	38
Aug 2021	30	8	1	39
Sep 2021	33	40	0	73
Oct 2021	25	35	0	60
Nov 2021	26	19	0	45
Dec 2021	13	4	1	18
Jan 2022	20	11	0	31
Feb 2022	16	2	1	19
Mar 2022	11	4	1	16
Apr 2022	12	3	2	17
May 2022	6	5	0	11
Jun 2022	14	2	2	18
Jul 2022	8	3	0	11
Aug 2022	18	4	0	22
Sep 2022	4	2	0	6
Oct 2022	14	6	4	24
Nov 2022	17	4	0	21
Dec 2022	12	6	0	18
Jan 2023	7	12	1	20
Feb 2023	14	3	0	17
Mar 2023	13	11	0	24
Apr 2023	16	11	1	28
May 2023	32	9	1	42
Jun 2023	36	4	1	41
Jul 2023	41	8	1	50
Aug 2023	45	10	3	58
Sep 2023	39	9	1	49
Oct 2023	45	9	2	56
Nov 2023	25	0	25
Dec 2023	51	5	5	61
Jan 2024	46	1	1	48
Feb 2024	46	6	3	55
Mar 2024	53	13	2	68
Apr 2024	48	7	3	58
May 2024	24	16	1	41
Jun 2024	22	8	1	31
Jul 2024	12	14	4	30
Aug 2024	37	8	1	46
Sep 2024	22	4	0	26
Oct 2024	19	4	0	23
Nov 2024	12	3	2	17
Dec 2024	14	10	3	27
Jan 2025	28	6	7	41
Feb 2025	37	5	2	44
Mar 2025	36	8	7	51
Apr 2025	23	11	1	35
May 2025	35	8	0	43
Jun 2025	54	6	0	60
Jul 2025	40	15	1	56
Aug 2025	62	9	2	73
Sep 2025	79	11	2	92
Oct 2025	27	12	0	39
Nov 2025	32	21	3	56

Latest update: 26 Nov 2025

Short summary

This study compares observations and simulation results of ozone in the lower tropical stratosphere. It shows that ozone in this region decreased from 1985 up to about 2002, which is consistent with an increase in tropical upwelling predicted by climate models. However, the decrease effectively stops after 2002, indicating that significant changes in tropical upwelling have occurred. The most important factor appears to be that the vertical ascent in the tropics is no longer accelerating.