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Title: Highly reactive light‐dependent monoterpenes in the Amazon

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2014GL062573· OSTI ID:1240455
 [1];  [2];  [3];  [4];  [1];  [1];  [1];  [1];  [1];  [5]
  1. Climate and Environment DepartmentInstituto Nacional de Pesquisas da Amazônia Manaus Brazil
  2. Climate Science Department, Earth Science DivisionLawrence Berkeley National Laboratory Berkeley California USA
  3. Department of Meteorology, College of Earth and Mineral SciencesPennsylvania State University University Park Pennsylvania USA
  4. School of Engineering and Applied Sciences and Department of Earth and Planetary SciencesHarvard University Cambridge Massachusetts USA
  5. Climate Science Department, Earth Science DivisionLawrence Berkeley National Laboratory Berkeley California USA, Department of GeographyUniversity of California Berkeley California USA

© 2015. The Authors. Despite orders of magnitude difference in atmospheric reactivity and great diversity in biological functioning, little is known about monoterpene speciation in tropical forests. Here we report vertically resolved ambient air mixing ratios for 12 monoterpenes in a central Amazon rainforest including observations of the highly reactive cis-β-ocimene (160 ppt), trans-β-ocimene (79 ppt), and terpinolene (32 ppt) which accounted for an estimated 21% of total monoterpene composition yet 55% of the upper canopy monoterpene ozonolysis rate. All 12 monoterpenes showed a mixing ratio peak in the upper canopy, with three demonstrating subcanopy peaks in 7 of 11 profiles. Leaf level emissions of highly reactive monoterpenes accounted for up to 1.9% of photosynthesis confirming light-dependent emissions across several Amazon tree genera. These results suggest that highly reactive monoterpenes play important antioxidant roles during photosynthesis in plants and serve as near-canopy sources of secondary organic aerosol precursors through atmospheric photooxidation via ozonolysis.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02‐05CH11231; AC02-05CH11231
OSTI ID:
1240455
Alternate ID(s):
OSTI ID: 1213451; OSTI ID: 1295978; OSTI ID: 1512175
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Vol. 42 Journal Issue: 5; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 53 works
Citation information provided by
Web of Science

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