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Amplified Trace Gas Removal in the Troposphere.

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Title: Amplified Trace Gas Removal in the Troposphere.
Authors: Hofzumahaus, Andreas, Rohrer, Franz, Keding Lu, Bohn, Birger, Brauers, Theo, Chih-Chung Chang, Fuchs, Hendrik, Holland, Frank, Kita, Kazuyuki, Kondo, Yutaka, Xin Li, Shengrong Lou, Min Shao, Limin Zeng, Wahner, Andreas, Yuanhang Zhang
Source: Science (pre-March 2025). 6/26/2009, Vol. 324 Issue 5935, p1702-1704. 3p.
Subjects: Trace gases, Troposphere, Pollutants, Environmental degradation, Hydroxyl group, Reactivity (Chemistry), Photochemical research, Oxidation, Ozone
Abstract: The degradation of trace gases and pollutants in the troposphere is dominated by their reaction with hydroxyl radicals (OH). The importance of OH rests on its high reactivity, its ubiquitous photochemical production in the sunlit atmosphere, and most importantly on its regeneration in the oxidation chain of the trace gases. In the current understanding, the recycling of OH proceeds through HO2 reacting with NO, thereby forming ozone. A recent field campaign in the Pearl River Delta, China, quantified tropospheric OH and HO2 concentrations and turnover rates by direct measurements. We report that concentrations of OH were three to five times greater than expected, and we propose the existence of a pathway for the regeneration of OH independent of NO, which amplifies the degradation of pollutants without producing ozone. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: <searchLink fieldCode="AR" term="%22Hofzumahaus%2C+Andreas%22">Hofzumahaus, Andreas</searchLink><br /><searchLink fieldCode="AR" term="%22Rohrer%2C+Franz%22">Rohrer, Franz</searchLink><br /><searchLink fieldCode="AR" term="%22Keding+Lu%22">Keding Lu</searchLink><br /><searchLink fieldCode="AR" term="%22Bohn%2C+Birger%22">Bohn, Birger</searchLink><br /><searchLink fieldCode="AR" term="%22Brauers%2C+Theo%22">Brauers, Theo</searchLink><br /><searchLink fieldCode="AR" term="%22Chih-Chung+Chang%22">Chih-Chung Chang</searchLink><br /><searchLink fieldCode="AR" term="%22Fuchs%2C+Hendrik%22">Fuchs, Hendrik</searchLink><br /><searchLink fieldCode="AR" term="%22Holland%2C+Frank%22">Holland, Frank</searchLink><br /><searchLink fieldCode="AR" term="%22Kita%2C+Kazuyuki%22">Kita, Kazuyuki</searchLink><br /><searchLink fieldCode="AR" term="%22Kondo%2C+Yutaka%22">Kondo, Yutaka</searchLink><br /><searchLink fieldCode="AR" term="%22Xin+Li%22">Xin Li</searchLink><br /><searchLink fieldCode="AR" term="%22Shengrong+Lou%22">Shengrong Lou</searchLink><br /><searchLink fieldCode="AR" term="%22Min+Shao%22">Min Shao</searchLink><br /><searchLink fieldCode="AR" term="%22Limin+Zeng%22">Limin Zeng</searchLink><br /><searchLink fieldCode="AR" term="%22Wahner%2C+Andreas%22">Wahner, Andreas</searchLink><br /><searchLink fieldCode="AR" term="%22Yuanhang+Zhang%22">Yuanhang Zhang</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 6/26/2009, Vol. 324 Issue 5935, p1702-1704. 3p.
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  Data: The degradation of trace gases and pollutants in the troposphere is dominated by their reaction with hydroxyl radicals (OH). The importance of OH rests on its high reactivity, its ubiquitous photochemical production in the sunlit atmosphere, and most importantly on its regeneration in the oxidation chain of the trace gases. In the current understanding, the recycling of OH proceeds through HO2 reacting with NO, thereby forming ozone. A recent field campaign in the Pearl River Delta, China, quantified tropospheric OH and HO2 concentrations and turnover rates by direct measurements. We report that concentrations of OH were three to five times greater than expected, and we propose the existence of a pathway for the regeneration of OH independent of NO, which amplifies the degradation of pollutants without producing ozone. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=pbh&AN=43083978
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        Value: 10.1126/science.1164566
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        Text: English
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        PageCount: 3
        StartPage: 1702
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      – SubjectFull: Trace gases
        Type: general
      – SubjectFull: Troposphere
        Type: general
      – SubjectFull: Pollutants
        Type: general
      – SubjectFull: Environmental degradation
        Type: general
      – SubjectFull: Hydroxyl group
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      – SubjectFull: Reactivity (Chemistry)
        Type: general
      – SubjectFull: Photochemical research
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      – SubjectFull: Oxidation
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      – SubjectFull: Ozone
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      – TitleFull: Amplified Trace Gas Removal in the Troposphere.
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              Text: 6/26/2009
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