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Title: Intermediate-scale horizontal isoprene concentrations in the near-canopy forest atmosphere and implications for emission heterogeneity
Authors: Batista, Carla E.
Ye, Jianhuai
Ribeiro, Igor Oliveira
Guimarães, Patrícia Costa
Medeiros, Adan Sady S.
Barbosa, Rafael G.
Oliveira, Rafael L.
Duvoisin, Sérgio Jr
Jardine, Kolby J.
Gu, Dasa
Guenther, Alex B.
McKinney, Karena A.
Martins, Leila Droprinchinski
Souza, Rodrigo Augusto Ferreira de
Martinc, Scot T.
Keywords: Isoprene
Air Quality
Concentration (parameter)
Controlled Study
Environmental Parameters
Isoprene Emission
Landscape Heterogeneity
Priority Journal
Transport Kinetics
Unmanned Aerial Vehicle
Issue Date: 2019
metadata.dc.publisher.journal: Proceedings of the National Academy of Sciences of the United States of America
metadata.dc.relation.ispartof: Volume 116, Número 39, Pags. 19318-19323
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 nearcanopy 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. © 2019 National Academy of Sciences. All rights reserved.
metadata.dc.identifier.doi: 10.1073/pnas.1904154116
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