2013
DOI: 10.5194/bg-10-1337-2013
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Bulk partitioning the growing season net ecosystem exchange of CO<sub>2</sub> in Siberian tundra reveals the seasonality of its carbon sequestration strength

Abstract: Abstract. This paper evaluates the relative contribution of light and temperature on net ecosystem CO2 uptake during the 2006 growing season in a polygonal tundra ecosystem in the Lena River Delta in Northern Siberia (72°22´ N, 126°30´ E). The occurrence and frequency of warm periods may be an important determinant of the magnitude of the ecosystem's carbon sink function, as they drive temperature-induced changes in respiration. Hot spells during the early portion of the growing season, when the photosynthetic… Show more

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Cited by 57 publications
(62 citation statements)
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“…scale closed-chamber measurements Sachs et al, 2010) and later expanded by eddy covariance measurements Sachs et al, 2008;Wille et al, 2008;Runkle et al, 2013). The seasonally averaged methane emissions determined via closed-chamber measurements for polygon rims and centres lay between 4.3 and 28 mg CH 4 m −2 d −1 , and between 4.9 and 100 mg CH 4 m −2 d −1 , respectively (Sachs et al, 2010).…”
Section: Current Level Of Knowledge Of the Carbon Pool In Permafrost-mentioning
confidence: 99%
“…scale closed-chamber measurements Sachs et al, 2010) and later expanded by eddy covariance measurements Sachs et al, 2008;Wille et al, 2008;Runkle et al, 2013). The seasonally averaged methane emissions determined via closed-chamber measurements for polygon rims and centres lay between 4.3 and 28 mg CH 4 m −2 d −1 , and between 4.9 and 100 mg CH 4 m −2 d −1 , respectively (Sachs et al, 2010).…”
Section: Current Level Of Knowledge Of the Carbon Pool In Permafrost-mentioning
confidence: 99%
“…Lasslop et al (2010) has modified the hyperbolic LRC to account for the temperature sensitivity of respiration and the VPD limitation of photosynthesis. Further, Runkle et al (2013) proposed a time-sensitive multi-bulk fluxpartitioning model, where the NEE time series was analysed in 1-week increments as the combination of a temperaturedependent R eco flux and a PAR-dependent flux (GPP). However, it remains uncertain as to under which circumstances each partitioning approach is more appropriate, especially in the boundaries between low-and high-Arctic due to the lack of dark night during polar days (when light is not a limiting factor for plant growth).…”
Section: Data Processing and Qualitymentioning
confidence: 99%
“…Moreover, GPP and R eco estimates can be calculated in different ways. Some algorithms fit an instantaneous temperature-respiration curve to night-time data to calculate R eco and estimate GPP Reichstein et al, 2005); others calculate R eco from a light-response curve (Gilmanov et al, 2003;Lindroth et al, 2007;Lund et al, 2012;Mbufong et al, 2014;Runkle et al, 2013). Unfortunately, different interpretations of the flux gap filling and partitioning lead to different estimates of NEE, GPP and R eco as well as undefined uncertainties.…”
Section: Introductionmentioning
confidence: 99%
“…The main features of the annual energy balance are low net radiation, higher atmospheric latent heat flux than sensible heat flux, and a large proportion of soil heat flux Kutzbach, 2006; 2011a, b). Previous research has focused on energy and carbon cycling (Abnizova et al, 2012;Knoblauch et al, 2008;Kutzbach et al, 2004Kutzbach et al, , 2007Liebner et al, 2011;Runkle et al, 2013;Sachs et al, 2008Sachs et al, , 2010Wille et al, 2008), ecosystem C modelling (Zhang et al, 2012), land cover classification Schneider et al, 2009), spatial heterogeneity and upscaling of land surface temperature (Langer et al, 2010), biological and paleoenvironmental reconstruction (Wetterich et al, 2008), and the characteristics of microbial communities (Wagner et al, 2007).…”
Section: Site Description and Data Collection Facilities At The New Smentioning
confidence: 99%