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Biogeochemistry

, Volume 116, Issue 1–3, pp 241–259 | Cite as

Spatial and temporal variability of pCO2 and CO2 efflux in seven Amazonian Rivers

  • Maria de Fátima F. L. RaseraEmail author
  • Alex V. Krusche
  • Jeffrey E. Richey
  • Maria V. R. Ballester
  • Reynaldo L. Victória
Article

Abstract

Current estimates of CO2 outgassing from Amazonian rivers and streams have considerable uncertainty since they are based on limited-time surveys of pCO2 measurements along the Amazon mainstem and mouths of major tributaries, using conservative estimates of gas exchange velocities. In order to refine basin-scale CO2 efflux estimates from Amazonian rivers, we present a long time (5-year) dataset of direct measurements of CO2 fluxes, gas transfer velocities and pCO2 measurements in seven representative rivers of the lowland Amazon basin fluvial network, six non-tidal (Negro, Solimões, Teles Pires, Cristalino, Araguaia and Javaés) and one tidal river (Caxiuanã), with sizes ranging from 4th to 9th order. Surveys were conducted from January 2006 to December 2010, in a total of 389 campaigns covering all stages of their hydrographs. CO2 fluxes and gas transfer velocities (k) were measured using floating chambers and pCO2 was measured simultaneously by headspace extraction followed by gas chromatography analysis. Results show high CO2 flux rate variability among rivers and hydrograph stages, ranging from −0.8 to 15.3 μmol CO2 m−2 s−1, with unexpected negative fluxes in clear-water rivers during low waters. Non-tidal rivers showed marked seasonal CO2 flux patterns, with significantly higher exchange during high waters. Seasonality was modulated by pCO2, which was positive and strongly correlated with discharge. In these rivers k was well correlated with wind speed, which allowed the use of wind data to model k. We estimate a release of 360 ± 60 Tg C year−1 from Amazonian rivers and streams within a 1.47 million km2 quadrant in the central lowland Amazon. Extrapolating these values to the basin upstream of Óbidos, results in an outgassing of 0.8 Pg C to the atmosphere each year. Our results are a step forward in achieving more accurate gas emission values for Amazonian rivers and their role in the annual carbon budget of the Amazon basin.

Keywords

Amazon Rivers Carbon cycling CO2 efflux Air–water gas exchange 

Notes

Acknowledgments

Funding for this study was provided by FAPESP Grants 08/58089-9, 10/19091-8 and MCT through LBA, and NASA LBA (NCC5-345 and NCC5-689). We thank especially the members of the Rede Beija Rio sampling network, Kelly Munhoz (FAPEMAT, MT), Soraya Rodrigues da Silva (UFT, TO), Maria Emília Sales (MPEG, PA), Hilândia Brandão (INPA, AM), Alexandra Montebelo, and the numerous students and employees who helped in the field.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Maria de Fátima F. L. Rasera
    • 1
    Email author
  • Alex V. Krusche
    • 1
  • Jeffrey E. Richey
    • 2
  • Maria V. R. Ballester
    • 1
  • Reynaldo L. Victória
    • 1
  1. 1.Environmental Analysis and Geoprocessing LaboratoryCenter for Nuclear Energy in Agriculture, University of São PauloPiracicabaBrazil
  2. 2.School of Oceanography, University of WashingtonSeattleUSA

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