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Interpreting seasonal changes in the carbon balance of southern Amazonia using measurements of XCO_2 and chlorophyll fluorescence from GOSAT

Parazoo, Nicholas C. and Bowman, Kevin and Frankenberg, Christian and Lee, Jung-Eun and Fisher, Joshua B. and Worden, John and Jones, Dylan B. A. and Berry, Joseph and Collatz, G. James and Baker, Ian T. and Jung, Martin and Liu, Junjie and Osterman, Gregory and O'Dell, Chris and Sparks, Athena and Butz, Andre and Guerlet, Sandrine and Yoshida, Yukio and Chen, Huilin and Gerbig, Christoph (2013) Interpreting seasonal changes in the carbon balance of southern Amazonia using measurements of XCO_2 and chlorophyll fluorescence from GOSAT. Geophysical Research Letters, 40 (11). pp. 2829-2833. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20160219-154725847

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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 CO_2 (XCO_2) 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 XCO_2 during the wet season and high XCO_2 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 XCO_2 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 XCO_2. 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.


Item Type:Article
Related URLs:
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http://onlinelibrary.wiley.com/doi/10.1002/grl.50452/abstractPublisherArticle
http://dx.doi.org/10.1002/grl.50452DOIArticle
ORCID:
AuthorORCID
Frankenberg, Christian0000-0002-0546-5857
Alternate Title:Interpreting seasonal changes in the carbon balance of southern Amazonia using measurements of XCO2 and chlorophyll fluorescence from GOSAT
Additional Information:©2013. American Geophysical Union. Received 7 March 2013; revised 4 April 2013; accepted 5 April 2013; published 6 June 2013. ACOS b2.9 XCO_2 data were produced by the ACOS/OCO-2 project at the Jet Propulsion Laboratory, CalTech, and obtained from the ACOS/OCO-2 data archive maintained at the NASA GES DISC. Development of RemoTeC algorithm is partly funded from ESA's CCI on GHGs and the European Commission's seventh framework program under grant agreement 218793 and by the Emmy-Noether programme of DFG through grant BU2599/1-1. CarbonTracker 2011 results provided by NOAA ESRL, Boulder, Colorado, USA from the website at http://carbontracker.noaa.gov. We thank Prof. Dr. Paulo Artaxo, Dr. Kenia Wiedemann, Fernando Morais, Alcides Ribeiro, University of Saõ Paulo, Brazil, and Livia Oliveira, INPA, Brazil, for their assistance and support in installing and operating the Picarro instrument at the TT34 tower. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. The Editor thanks an anonymous reviewer for his/her assistance in evaluating this paper.
Group:Keck Institute for Space Studies
Funders:
Funding AgencyGrant Number
European Space Agency (ESA)UNSPECIFIED
European Research Council (ERC)218793
Deutsche Forschungsgemeinschaft (DFG)BU2599/1-1
Keck Institute for Space Studies (KISS)UNSPECIFIED
Record Number:CaltechAUTHORS:20160219-154725847
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160219-154725847
Official Citation:Parazoo, N. C., et al. (2013), Interpreting seasonal changes in the carbon balance of southern Amazonia using measurements of XCO2 and chlorophyll fluorescence from GOSAT, Geophys. Res. Lett., 40, 2829–2833, doi:10.1002/grl.50452.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64616
Collection:CaltechAUTHORS
Deposited By: Colette Connor
Deposited On:20 Feb 2016 00:36
Last Modified:06 Feb 2017 22:49

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