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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
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Observational evidence for interhemispheric hydroxyl-radical parity.

P K Patra1, M C Krol2, S A Montzka3

  • 11] Department of Environmental Geochemical Cycle Research, JAMSTEC, Yokohama 236 0001, Japan [2] CAOS, Graduate School of Studies, Tohoku University, Sendai 980 8578, Japan.

Nature
|September 12, 2014
PubMed
Summary
This summary is machine-generated.

The hydroxyl radical (OH) ratio between the Northern and Southern Hemispheres is crucial for estimating greenhouse gas emissions. This study estimates this ratio to be 0.97 ± 0.12, suggesting some emission estimates may be too high.

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Area of Science:

  • Atmospheric Chemistry
  • Climate Science
  • Environmental Monitoring

Background:

  • The hydroxyl radical (OH) is a primary atmospheric oxidant controlling the lifetime of many pollutants and greenhouse gases.
  • The ratio of OH concentrations between the Northern Hemisphere (NH) and Southern Hemisphere (SH) is critical for accurately estimating emissions of species like methane and nitrogen oxides.
  • Existing estimates for the NH/SH OH ratio vary widely, indicating a significant knowledge gap.

Purpose of the Study:

  • To determine a more precise NH/SH ratio of hydroxyl radical (OH) concentrations.
  • To refine understanding of interhemispheric transport and its influence on atmospheric oxidant distribution.
  • To assess the implications of the NH/SH OH ratio for top-down emission inventories.

Main Methods:

  • Utilized methyl chloroform data as a proxy for OH concentrations.
  • Employed an atmospheric transport model to simulate interhemispheric transport and emissions.
  • Optimized global emissions and mean OH abundance to match methyl chloroform measurements from surface and aircraft networks.

Main Results:

  • Established a linear relationship between the modeled NH-SH gradient of methyl chloroform and the modeled NH/SH OH ratio.
  • Estimated the NH/SH OH ratio to be 0.97 ± 0.12 for the 2004-2011 period.
  • Demonstrated that methyl chloroform data can effectively constrain the NH/SH OH ratio.

Conclusions:

  • The study provides a constrained estimate for the NH/SH OH ratio, improving our understanding of atmospheric oxidant distribution.
  • Findings suggest that top-down emission estimates for nitrogen oxides in the NH, relying on NH/SH OH ratios > 1, might be overestimated.
  • This research highlights the importance of accurate OH distribution for reliable emission calculations.