Interpreting seasonal changes in the carbon balance of southern Amazonia using measurements of XCO2 and chlorophyll fluorescence from GOSAT

Nicholas C. Parazoo*, Kevin Bowman, Christian Frankenberg, Jung-Eun Lee, Joshua B. Fisher, John Worden, Dylan B. A. Jones, Joseph Berry, G. James Collatz, Ian T. Baker, Martin Jung, Junjie Liu, Gregory Osterman, Chris O'Dell, Athena Sparks, Andre Butz, Sandrine Guerlet, Yukio Yoshida, Huilin Chen, Christoph Gerbig

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Amazon forests exert a major influence on the global carbon cycle, but quantifying the impact is complicated by diverse landscapes and sparse data. Here we examine seasonal carbon balance in southern Amazonia using new measurements of column-averaged dry air mole fraction of CO2 (XCO2) and solar induced chlorophyll fluorescence (SIF) from the Greenhouse Gases Observing Satellite (GOSAT) from July 2009 to December 2010. SIF, which reflects gross primary production (GPP), is used to disentangle the photosynthetic component of land-atmosphere carbon exchange. We find that tropical transitional forests in southern Amazonia exhibit a pattern of low XCO2 during the wet season and high XCO2 in the dry season that is robust to retrieval methodology and with seasonal amplitude double that of cerrado ecosystems to the east (4ppm versus 2ppm), including enhanced dilution of 2.5ppm in the wet season. Concomitant measurements of SIF, which are inversely correlated with XCO2 in southern Amazonia (r=-0.53, p

Original languageEnglish
Pages (from-to)2829-2833
Number of pages5
JournalGeophysical research letters
Volume40
Issue number11
DOIs
Publication statusPublished - 16-Jun-2013

Keywords

  • carbon cycle
  • amazon
  • satellite remote sensing
  • GOSAT
  • chlorophyll fluorescence
  • biomass burning
  • CO2 RETRIEVAL ALGORITHM
  • ATMOSPHERIC CO2
  • RAIN-FOREST
  • DROUGHT
  • DIOXIDE
  • DIEBACK
  • SPACE
  • LAND

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