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Verfasst von:Parazoo, Nicholas C. [VerfasserIn]   i
 Butz, André [VerfasserIn]   i
Titel:Interpreting seasonal changes in the carbon balance of southern Amazonia using measurements of XCO2 and chlorophyll fluorescence from GOSAT
Verf.angabe: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, and Christoph Gerbig
E-Jahr:2013
Jahr:6 June 2013
Umfang:5 S.
Fussnoten:Im Titel ist die "2" tiefgestellt ; Gesehen am 14.08.2019
Titel Quelle:Enthalten in: Geophysical research letters
Ort Quelle:Hoboken, NJ : Wiley, 1974
Jahr Quelle:2013
Band/Heft Quelle:40(2013), 11, Seite 2829-2833
ISSN Quelle:1944-8007
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 (4 ppm versus 2 ppm), including enhanced dilution of 2.5 ppm in the wet season. Concomitant measurements of SIF, which are inversely correlated with XCO2 in southern Amazonia (r = −0.53, p < 0.001), indicate that the enhanced variability is driven by seasonal changes in GPP due to coupling of strong vertical mixing with seasonal changes in underlying carbon exchange. This finding is supported by forward simulations of the Goddard Chemistry Transport Model (GEOS-Chem) which show that local carbon uptake in the wet season and loss in the dry season due to emissions by ecosystem respiration and biomass burning produces best agreement with observed XCO2. We conclude that GOSAT provides critical measurements of carbon exchange in southern Amazonia, but more samples are needed to examine moist Amazon forests farther north.
DOI:doi:10.1002/grl.50452
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: http://dx.doi.org/10.1002/grl.50452
 Volltext: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/grl.50452
 DOI: https://doi.org/10.1002/grl.50452
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:amazon
 biomass burning
 carbon cycle
 chlorophyll fluorescence
 GOSAT
 satellite remote sensing
K10plus-PPN:1586234846
Verknüpfungen:→ Zeitschrift

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