Iodine Oxoacids Formed in Oceans Have Major Impact on Climate and Human Health

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Marine Atmosphere Simulation in CLOUD Chamber

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Iodine produced from the sea and ice is transformed by ozone and sunshine into iodic acid and other substances. These form brand-new particles and increase clouds, warming the polar environment. Cosmic rays highly boost the particle development rates. Credit: Helen Cawley

Molecular iodine, a significant emission from the ocean, can rapidly transform to iodic oxoacids even under weak daytime conditions. These oxoacids lead quickly to aerosol particles that considerably impact environment and human health.

Iodine-consisting of vapors that are produced from oceans are a significant source of aerosol particles. “Despite their importance to the climate, the formation of marine particles has been poorly understood,” states Siddharth Iyer, Postdoctoral Researcher in Aerosol Physics Laboratory at Tampere University.

In this research study, the development of aerosol particles form from iodine-containing vapours under marine border layer conditions were studied. The experiments were performed in the ultra-clean CLOUD chamber in CERN, where the nucleation and development rates in addition to the structure of newly formed particles from iodic oxoacids (iodic acid and iodous acid) were determined.

These vapours stem from photolysis and oxidation of molecular iodine, for which the ocean surface area is a significant source. The conversion to iodine oxoacids were discovered to be very quickly, even under weak daytime conditions. Although iodic acid was recognized as the crucial vapour, an associated types – iodous acid – was likewise discovered to play an essential supporting function in the preliminary actions of neutral (uncharged) particle development.

“Sulfuric acid is known to be key player in new particle formation, but our results indicate that iodine oxoacid particle formation can compete with sulfuric acid in pristine regions of the atmosphere. This significantly advances our understanding of aerosol formation,” Iyer summarize.

The post Role of iodine oxoacids in climatic aerosol nucleation was released in Science.

Reference: “Role of iodine oxoacids in atmospheric aerosol nucleation” by Xu-Cheng He, Yee Jun Tham, Lubna Dada, Mingyi Wang, Henning Finkenzeller, Dominik Stolzenburg, Siddharth Iyer, Mario Simon, Andreas Kürten, Jiali Shen, Birte Rörup, Matti Rissanen, Siegfried Schobesberger, Rima Baalbaki, Dongyu S. Wang, Theodore K. Koenig, Tuija Jokinen, Nina Sarnela, Lisa J. Beck, João Almeida, Stavros Amanatidis, António Amorim, Farnoush Ataei, Andrea Baccarini, Barbara Bertozzi, Federico Bianchi, Sophia Brilke, Lucía Caudillo, Dexian Chen, Randall Chiu, Biwu Chu, António Dias, Aijun Ding, Josef Dommen, Jonathan Duplissy, Imad El Haddad, Loïc Gonzalez Carracedo, Manuel Granzin, Armin Hansel, Martin Heinritzi, Victoria Hofbauer, Heikki Junninen, Juha Kangasluoma, Deniz Kemppainen, Changhyuk Kim, Weimeng Kong, Jordan E. Krechmer, Aleksander Kvashin, Totti Laitinen, Houssni Lamkaddam, Chuan Ping Lee, Katrianne Lehtipalo, Markus Leiminger, Zijun Li, Vladimir Makhmutov, Hanna E. Manninen, Guillaume Marie, Ruby Marten, Serge Mathot, Roy L. Mauldin, Bernhard Mentler, Ottmar Möhler, Tatjana Müller, Wei Nie, Antti Onnela, Tuukka Petäjä, Joschka Pfeifer, Maxim Philippov, Ananth Ranjithkumar, Alfonso Saiz-Lopez, Imre Salma, Wiebke Scholz, Simone Schuchmann, Benjamin Schulze, Gerhard Steiner, Yuri Stozhkov, Christian Tauber, António Tomé, Roseline C. Thakur, Olli Väisänen, Miguel Vazquez-Pufleau, Andrea C. Wagner, Yonghong Wang, Stefan K. Weber, Paul M. Winkler, Yusheng Wu, Mao Xiao, Chao Yan, Qing Ye, Arttu Ylisirniö, Marcel Zauner-Wieczorek, Qiaozhi Zha, Putian Zhou, Richard C. Flagan, Joachim Curtius, Urs Baltensperger, Markku Kulmala, Veli-Matti Kerminen, Theo Kurtén, Neil M. Donahue, Rainer Volkamer, Jasper Kirkby, Douglas R. Worsnop and Mikko Sipilä, 5 February 2021, Science.
DOI: 10.1126/science.abe0298 



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