Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/15859
Title: Opposite OH reactivity and ozone cycles in the Amazon rainforest and megacity Beijing: Subversion of biospheric oxidant control by anthropogenic emissions
Authors: Williams, Jonathan C.
Keßel, Stephan U.
Nölscher, Anke C.
Yang, Yudong
Lee, Yue
Yáñez-Serrano, Ana Maria
Wolff, Stefan
Kesselmeier, Jürgen
Klüpfel, Thomas
Lelieveld, Jos
Shao, Min
Keywords: Air Quality
Biospherics
Carbon
Carbon Dioxide
Ecology
Ecosystems
Free Radicals
Nitrogen Oxides
Oxidants
Ozone
Volatile Organic Compounds
Amazon
Beijing
Megacities
Oh Reactivity
Rainforest
Atmospheric Chemistry
Carbon Dioxide
Hydroxyl Radical
Isoprene
Nitrogen Oxide
Ozone
Air Pollution
Air Quality
Biosphere
Carbon Footprint
China
City
Comparative Reactivity Method
Ecosystem Health
Mass Spectrometry
Measurement
Nitrous Oxide Emission
Ozone Layer
Photochemistry
Photooxidation
Priority Journal
Proton Transfer Reaction Mass Spectrometry
Seasonal Variation
Tropical Rain Forest
Issue Date: 2016
metadata.dc.publisher.journal: Atmospheric Environment
metadata.dc.relation.ispartof: Volume 125, Pags. 112-118
Abstract: The Amazon rainforest in Brazil and the megacity of Beijing in China are two of the most strongly contrasting habitats on Earth. In both locations, volatile chemicals are emitted into the atmosphere affecting the local atmospheric chemistry, air quality and ecosystem health. In this study, the total reactivity in air available for reaction with the atmosphere's primary oxidant the OH radical, has been measured directly in both locations along with individual volatile organic compounds(VOC), nitrogen oxides(NOx), ozone(O3) and carbon dioxide(CO2). Peak daily OH-reactivity in the Amazon 72 s-1, (min. 27 s-1) was approximately three times higher than Beijing 26 s-1 (min. 15 s-1). However, diel ozone variation in Amazonia was small (~5 ppb) whereas in Beijing ~70 ppb harmful photochemical ozone was produced by early afternoon. Amazon OH-reactivity peaked by day, was strongly impacted by isoprene, and anticorrelated to CO2, whereas in Beijing OH-reactivity was higher at night rising to a rush hour peak, was dominated by NO2 and correlated with CO2. These converse diel cycles between urban and natural ecosystems demonstrate how biosphere control of the atmospheric environment is subverted by anthropogenic emissions. © 2015 The Authors.
metadata.dc.identifier.doi: 10.1016/j.atmosenv.2015.11.007
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