Measurements of HOx during Trace-P
Abstract
OH is the major oxidant in the troposphere. While in polluted air masses it is involved in the removal of pollutants and the formation of ozone and aerosols, in unpolluted air it removes ozone. As OH is in a fast steady state with HO2, the sum of both is commonly addressed as HOx. We present OH and HO2 data from the DC8 during the Trace-P mission, which was focused on assessing the emissions from East Asia and study their chemical evolution into the pacific basin. During Trace-P a broad spectrum of conditions was observed. The changing photolysis frequencies during sunrise and sunsets can be used to test our understanding of photolytic HOx sources. We show how HOx evolves in the moderately polluted marine boundary layer and the clean free troposphere during sunrise. We also present the observed in situ O3 budget at different locations and altitudes and study the effects of aerosols on HOx during cloud and dust events.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2002
- Bibcode:
- 2002AGUFM.A62A0116H
- Keywords:
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- 0365 Troposphere: composition and chemistry