Intra- and interannual changes in isoprene  emission from central Amazonia

Abstract. Isoprene emissions are a key component in biosphere–atmosphere interactions, and the most significant global source is the Amazon
rainforest. However, intra- and interannual variations in biological and environmental factors that regulate isoprene emission from Amazonia are
not well understood and, thereby, are poorly represented in models. Here, with datasets covering several years of measurements at the Amazon Tall Tower
Observatory (ATTO) in central Amazonia, Brazil, we (1) quantified canopy profiles of isoprene mixing ratios across seasons of normal and anomalous
years and related them to the main drivers of isoprene emission – solar radiation, temperature, and leaf phenology; (2) evaluated the effect of
leaf age on the magnitude of the isoprene emission factor (Es) from different tree species and scaled up to canopy with intra- and
interannual leaf age distribution derived by a phenocam; and (3) adapted the leaf age algorithm from the Model of Emissions of Gases
and Aerosols from Nature (MEGAN) with observed changes in Es
across leaf ages. Our results showed that the variability in isoprene mixing ratios was higher between seasons (max during the dry-to-wet
transition seasons) than between years, with values from the extreme 2015 El Niño year not significantly higher than in normal years. In
addition, model runs considering in situ observations of canopy Es and the modification on the leaf age algorithm with leaf-level
observations of Es presented considerable improvements in the simulated isoprene flux. This shows that MEGAN estimates of isoprene
emission can be improved when biological processes are mechanistically incorporated into the model.

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Published: Jul 21, 2023
Vol/Issue: 23(14)
Pages: 8149-8168
License: View

Authors

Cléo Quaresma Dias-Junior

Ana Maria Yáñez-Serrano

J

Jürgen Kesselmeier

E

Efstratios Bourtsoukidis

J

Jonathan Williams

From the Division of Endocrinology, Diabetes, and Hypertension, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA.

P

Pedro Ivo Lembo Silveira de Assis

Sérgio Duvoisin Júnior

Atmospheric Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany.

M

Matthias Sörgel

Atmospheric Chemistry Department Max Plank Institute for Chemistry Mainz Germany

Viviana Londoño Lemos

M

Maria Paula Contreras

Iván Mauricio Cely Toro

Funding

National Science Foundation Award: NSF-PRFB-1711997

Bundesministerium für Bildung und Forschung Award: 01LB1001A

Cite This Article

Eliane Gomes Alves, Raoni Aquino Santana, Cléo Quaresma Dias-Junior, et al. (2023). Intra- and interannual changes in isoprene emission from central Amazonia. Atmospheric Chemistry and Physics, 23(14), 8149-8168. https://doi.org/10.5194/acp-23-8149-2023

Intra- and interannual changes in isoprene emission from central Amazonia

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