Regional atmospheric COsub(2) inversion reveals seasonal and geographic differences in Amazon net biome exchange
Carregando...
Data
2016
Data de publicação:
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
Global Change Biology
ODS
Resumo
Understanding tropical rainforest carbon exchange and its response to heat and drought is critical for quantifying the
effects of climate change on tropical ecosystems, including global climate–carbon feedbacks. Of particular importance
for the global carbon budget is net biome exchange of CO2 with the atmosphere (NBE), which represents nonfire carbon fluxes into and out of biomass and soils. Subannual and sub-Basin Amazon NBE estimates have relied heavily on
process-based biosphere models, despite lack of model agreement with plot-scale observations. We present a new
analysis of airborne measurements that reveals monthly, regional-scale (~1–8 9 106 km2
) NBE variations. We
develop a regional atmospheric CO2 inversion that provides the first analysis of geographic and temporal variability
in Amazon biosphere–atmosphere carbon exchange and that is minimally influenced by biosphere model-based first
guesses of seasonal and annual mean fluxes. We find little evidence for a clear seasonal cycle in Amazon NBE but do
find NBE sensitivity to aberrations from long-term mean climate. In particular, we observe increased NBE (more carbon emitted to the atmosphere) associated with heat and drought in 2010, and correlations between wet season NBE
and precipitation (negative correlation) and temperature (positive correlation). In the eastern Amazon, pulses of
increased NBE persisted through 2011, suggesting legacy effects of 2010 heat and drought. We also identify regional
differences in postdrought NBE that appear related to long-term water availability. We examine satellite proxies and
find evidence for higher gross primary productivity (GPP) during a pulse of increased carbon uptake in 2011, and
lower GPP during a period of increased NBE in the 2010 dry season drought, but links between GPP and NBE
changes are not conclusive. These results provide novel evidence of NBE sensitivity to short-term temperature and
moisture extremes in the Amazon, where monthly and sub-Basin estimates have not been previously available.
Como referenciar
ALDEN, CAROLINE B.; MILLER, JOHN B.; GATTI, LUCIANA V.; GLOOR, MANUEL M.; GUAN, KAIYU; MICHALAK, ANNA M.; LAAN LUIJKX, INGRID T. van der; TOUMA, DANIELLE; ANDREWS, ARLYN; BASSO, LUANA S.; CORREIA, CAIO S.; DOMINGUES, LUCAS G.; JOINER, JOANNA; KROL, MAARTEN C.; LYAPUSTIN, ALEXEI I.; PETERS, WOUTER; SHIGA, YOICHI P.; THONING, KIRK; VALDE, IVAR R. van der; LEEUWEN, THIJS T. van; YADAV, VINEET; DIFFENBAUGH, NOAH S. Regional atmospheric COsub(2) inversion reveals seasonal and geographic differences in Amazon net biome exchange. Global Change Biology, v. 22, p. 3427-3443, 2016. DOI: 10.1111/gcb.13305. Disponível em: http://repositorio.ipen.br/handle/123456789/26546. Acesso em: 10 May 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.