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Proc Natl Acad Sci U S A

Title:		Intermediate-scale horizontal isoprene concentrations in the near-canopy forest atmosphere and implications for emission heterogeneity
Author(s):		Batista CE; Ye J; Ribeiro IO; Guimaraes PC; Medeiros ASS; Barbosa RG; Oliveira RL; Duvoisin S; Jardine KJ; Gu D; Guenther AB; McKinney KA; Martins LD; Souza RAF; Martin ST;
Address:		"Post-graduate Program in Climate and Environment, National Institute of Amazonian Research, 69060-001 Manaus, Amazonas, Brazil. School of Technology, Amazonas State University, 69065-020 Manaus, Amazonas, Brazil. School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138; jye@seas.harvard.edu souzaraf@gmail.com scot_martin@harvard.edu. Advanced Study Center at Tefe, Amazonas State University, 69553-100 Tefe, Amazonas, Brazil. Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720. Department of Earth System Science, University of California, Irvine, CA 92697. Department of Chemistry, Colby College, Waterville, ME 04901. Department of Chemistry, Federal University of Technology-Parana, 86047-125 Londrina, Parana, Brazil. Post-graduate Program in Climate and Environment, National Institute of Amazonian Research, 69060-001 Manaus, Amazonas, Brazil; jye@seas.harvard.edu souzaraf@gmail.com scot_martin@harvard.edu. Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138"
Journal Title:		Proc Natl Acad Sci U S A
Year:		2019
Volume:		20190909
Issue:		39
Page Number:		19318 - 19323
DOI:		10.1073/pnas.1904154116
ISSN/ISBN:		1091-6490 (Electronic) 0027-8424 (Print) 0027-8424 (Linking)
Abstract:		"The emissions, deposition, and chemistry of volatile organic compounds (VOCs) are thought to be influenced by underlying landscape heterogeneity at intermediate horizontal scales of several hundred meters across different forest subtypes within a tropical forest. Quantitative observations and scientific understanding at these scales, however, remain lacking, in large part due to a historical absence of canopy access and suitable observational approaches. Herein, horizontal heterogeneity in VOC concentrations in the near-canopy atmosphere was examined by sampling from an unmanned aerial vehicle (UAV) flown horizontally several hundred meters over the plateau and slope forests in central Amazonia during the morning and early afternoon periods of the wet season of 2018. Unlike terpene concentrations, the isoprene concentrations in the near-canopy atmosphere over the plateau forest were 60% greater than those over the slope forest. A gradient transport model constrained by the data suggests that isoprene emissions differed by 220 to 330% from these forest subtypes, which is in contrast to a 0% difference implemented in most present-day biosphere emissions models (i.e., homogeneous emissions). Quantifying VOC concentrations, emissions, and other processes at intermediate horizontal scales is essential for understanding the ecological and Earth system roles of VOCs and representing them in climate and air quality models"
Keywords:		Atmosphere/*chemistry Brazil Butadienes/*analysis *Forests Hemiterpenes/*analysis Seasons Trees/classification/physiology Volatile Organic Compounds/*analysis Amazon tropical forest UAV measurements intermediate horizontal scales isoprene emissions landsc;
Notes:		"MedlineBatista, Carla E Ye, Jianhuai Ribeiro, Igor O Guimaraes, Patricia C Medeiros, Adan S S Barbosa, Rafael G Oliveira, Rafael L Duvoisin, Sergio Jr Jardine, Kolby J Gu, Dasa Guenther, Alex B McKinney, Karena A Martins, Leila D Souza, Rodrigo A F Martin, Scot T eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2019/09/11 Proc Natl Acad Sci U S A. 2019 Sep 24; 116(39):19318-19323. doi: 10.1073/pnas.1904154116. Epub 2019 Sep 9"