A multi-scenario Lagrangian trajectory analysis to identify source regions of the Asian tropopause aerosol layer on the Indian subcontinent in August 2016

Jan Clemens, Bärbel Vogel, Lars Hoffmann, Sabine Griessbach, Nicole Thomas, Suvarna Fadnavis, Rolf Müller, Thomas Peter, and Felix Ploeger

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Cumulative views and downloads (calculated since 12 Apr 2023)

Month	HTML	PDF	XML	Total
Apr 2023	120	40	5	165
May 2023	65	16	3	84
Jun 2023	38	13	2	53
Jul 2023	19	7	1	27
Aug 2023	22	9	0	31
Sep 2023	16	10	1	27
Oct 2023	20	13	3	36
Nov 2023	12	4	4	20
Dec 2023	12	4	2	18
Jan 2024	219	31	2	252
Feb 2024	64	16	2	82
Mar 2024	37	12	3	52
Apr 2024	47	12	8	67
May 2024	39	23	7	69
Jun 2024	99	23	6	128
Jul 2024	204	14	9	227
Aug 2024	56	12	8	76
Sep 2024	93	13	2	108
Oct 2024	55	6	0	61
Nov 2024	64	11	3	78
Dec 2024	37	16	1	54
Jan 2025	31	25	2	58
Feb 2025	55	15	2	72
Mar 2025	41	4	3	48
Apr 2025	50	13	1	64
May 2025	84	25	2	111
Jun 2025	92	102	3	197
Jul 2025	64	41	5	110
Aug 2025	117	47	0	164
Sep 2025	479	44	7	530
Oct 2025	45	54	0	99
Nov 2025	125	60	4	189
Dec 2025	122	74	8	204
Jan 2026	174	136	6	316
Feb 2026	174	82	8	264
Mar 2026	103	219	22	344
Apr 2026	101	117	4	222
May 2026	72	84	5	161
Jun 2026	16	17	5	38
Jul 2026	110	45	18	173
Aug 2026	15	19	11	45

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Short summary

The source regions of the Asian tropopause aerosol layer (ATAL) are debated. We use balloon-borne measurements of the layer above Nainital (India) in August 2016 and atmospheric transport models to find ATAL source regions. Most air originated from the Tibetan plateau. However, the measured ATAL was stronger when more air originated from the Indo-Gangetic Plain and weaker when more air originated from the Pacific. Hence, the results indicate important anthropogenic contributions to the ATAL.