Tight Coupling of Surface and In-Plant Biochemistry and Convection Governs Key Fine Particulate Components over the Amazon Rainforest
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- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Tsinghua Univ., Beijing (China)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Karlsruhe Inst. of Technology (KIT) (Germany)
- Max Planck Institute for Chemistry, Mainz (Germany)
- German Aerospace Center (DLR), Oberpfaffenhofen (Germany)
- Harvard Univ., Cambridge, MA (United States)
- Harvard Univ., Cambridge, MA (United States); Southern University of Science and Technology (SUSTech), Shenzhen (China)
- Univ. of California, Irvine, CA (United States)
- Amazonas State Univ., Manaus (Brazil)
- Univ. of Leipzig (Germany)
We report that throughout the troposphere over the Amazon rainforest, isoprene epoxydiol-secondary organic aerosols (IEPOX-SOA) are key components of submicrometer particle mass. IEPOX-SOA is thought to form by multiphase chemical pathways in the atmosphere, but using detailed model simulations, we show that these pathways are strongly inhibited by the solid particle phase state prevailing in the upper troposphere. We find that 2-methyltetrol gases formed by in-plant biochemical oxidation pathways, their partitioning to fine particles, and dissolution in cloud droplets can explain over 90% of IEPOX-SOA mass concentrations in the upper troposphere. In agreement with previous PM10 chiral measurements, our simulations indicate that plant biochemical processes are the dominant source of particulate 2-methyltetrols in the lower troposphere as well (>70%). Our results imply that in-plant biochemistry plays a central but previously unidentified role in aerosol processes and atmosphere-biosphere-climate interactions over the rainforest.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); Sao Paulo Research Foundation
- Grant/Contract Number:
- AC05-76RL01830; 2009/15235-8; 2013/05014-0
- OSTI ID:
- 1855401
- Report Number(s):
- PNNL-SA-163479
- Journal Information:
- ACS Earth and Space Chemistry, Vol. 6, Issue 2; ISSN 2472-3452
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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