The growing season greenhouse gas balance of a continental tundra site in the Indigirka lowlands, NE Siberia

• Main Authors: A. V. Kononov, S. V. Karsanaev, D. A. Suzdalov
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2007
• Subjects: Indigirka; Tundra; Siberia
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.391.4676; http://hal.archives-ouvertes.fr/docs/00/29/76/53/PDF/bg-4-985-2007.pdf

Abstract. Carbon dioxide and methane fluxes were measured at a tundra site near Chokurdakh, in the lowlands of the Indigirka river in north-east Siberia. This site is one of the few stations on Russian tundra and it is different from most other tundra flux stations in its continentality. A suite of methods was applied to determine the fluxes of NEE, GPP, Reco and methane, including eddy covariance, chambers and leaf cuvettes. Net carbon dioxide fluxes were high compared with other tundra sites, with NEE=−92 g C m−2 yr−1, which is composed of an Reco=+141 g C m−2 yr−1 and GPP=−232 g C m−2 yr−1. This large carbon dioxide sink may be explained by the continental climate, that is reflected in low winter soil temperatures (−14◦C), reducing the respiration rates, and short, relatively warm summers, stimulating high photosynthesis rates. Interannual variability