Aircraft observations suggest an important contribution of methanesulfonic and sulfuric acids to tropical Indo-Pacific aerosol

Klebach, Hannah; Heinritzi, Martin; Kaiser, Katharina; Beck, Lisa; Ruhl, Samuel; Atabakhsh, Samira; Bhattacharyya, Nirvan; Caudillo-Plath, Lucía; Joppe, Philipp; Klimach, Thomas; Lloyd, Peter; Pöhlker, Mira; Pöschl, Ulrich; Richter, Sarah; Russell, Douglas M.; Schneider, Johannes; Zauner-Wieczorek, Marcel; Curtius, Joachim

doi:10.5194/acp-26-12355-2026

Articles | Volume 26, issue 17

https://doi.org/10.5194/acp-26-12355-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-26-12355-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 26, issue 17

Research article

|

01 Sep 2026

Research article |

| 01 Sep 2026

Aircraft observations suggest an important contribution of methanesulfonic and sulfuric acids to tropical Indo-Pacific aerosol

Hannah Klebach, Martin Heinritzi, Katharina Kaiser, Lisa Beck, Samuel Ruhl, Samira Atabakhsh, Nirvan Bhattacharyya, Lucía Caudillo-Plath, Philipp Joppe, Thomas Klimach, Peter Lloyd, Mira Pöhlker, Ulrich Pöschl, Sarah Richter, Douglas M. Russell, Johannes Schneider, Marcel Zauner-Wieczorek, and Joachim Curtius

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Cumulative views and downloads (calculated since 23 Apr 2026)

Month	HTML	PDF	XML	Total
Apr 2026	175	99	11	285
May 2026	111	85	11	207
Jun 2026	17	13	3	33
Jul 2026	60	43	6	109
Aug 2026	22	14	8	44

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Short summary

Marine atmospheric aerosols remain a major uncertainty in climate models. We report gas and particle phase measurements of two important aerosol forming vapours, sulfuric acid and methanesulfonic acid in the Indo-Pacific. We find that the latter typically dominates over sulfuric acid and contributes significantly to free tropospheric aerosol. Deep convection transports the precursor of both acids to the upper troposphere, providing a key aerosol source in the pristine remote Pacific Ocean.


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