Seasonal changes in isoprene emission and deposition in central Amazonia
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2017
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ILEAPS SCIENCE CONFERENCE, 5th
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Isoprene fluxes vary seasonally with changes in environmental factors as light and
temperature, and biological factors as leaf phenology. But, our understanding of isoprene
seasonal dependency to these factors is still limited in Amazonia. It has been indicated that
the dry season shows higher emissions than the wet season, because there is more light
available and higher temperature. Also, leaf phenology was recently suggested to drive
ecosystem isoprene emissions, but local seasonal observations were scarce or not available.
Here, we present canopy isoprene flux measured in two sites of primary rainforest in central
Amazonia and compare to changes in light, temperature, and leaf phenology. The highest
emissions were during the dry and dry-to-wet transition seasons, and the wet and the wet-to
dry transition seasons revealed net deposition for one site. Leaf phenology, referred as
changes in observed mature Leaf Area Index, was the most correlated factor and explained up
to 59% of seasonal isoprene emissions. Attempting to represent this with modeling, the
MEGAN 2.1 leaf age algorithm was driven by inputs resulted from a leaf demography64
ontogeny model that uses leaf flushing observed in the fields. However, model emissions
were overestimated and did not capture the seasonal behavior observed. Using the leaf
phenology from the field as inputs for the leaf age algorithm of MEGAN 2.1, improved
estimates of the proportion of leaves in different leaf age categories for each site, but did not
change the relative isoprene emission capacity used for each age class. This study hightlights
the importance of accounting for differential isoprene emission capacity across canopy leaf
age classes and of identifying the forest adaptive mechanisms that underly seasonal variation
of emission, and potentially deposition, of isoprene in Amazonia.
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ALVES, ELIANE G.; TOTA, JULIO; TURNIPSEED, ANDREW; VEGA BUSTILLOS, JOSE O.W.; SANTANA, RAONI A.; LOPES, PAULA R.C.; CIRINO, GLAUBER G.; TAVARES, JULIA V.; LOPES, ALINE; NELSON, BRUCE; ROSA, DIOGO; VALE, DALTON; SOUZA, RODRIGO de; GU, DASA; STAVRAKOU, TRISSEVGENI; ADAMS, DAVID; WU, JIN; SALESKA, SCOTT; DIAS-JUNIOR, CLEO; YANEZ-SERRANO, ANA M.; KESSELMEIER, JURGEN; KARL, THOMAS; MANZI, ANTONIO; GUENTHER, ALEX. Seasonal changes in isoprene emission and deposition in central Amazonia. In: ILEAPS SCIENCE CONFERENCE, 5th, September 11-14, 2017, Oxford, UK. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/29201. Acesso em: 08 Feb 2025.
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