Autumn warming reduces the CO2 sink of a black spruce forest in interior Alaska based on a nine‐year eddy covariance measurement
Citations Over TimeTop 10% of 2013 papers
Abstract
Nine years (2003-2011) of carbon dioxide (CO2) flux were measured at a black spruce forest in interior Alaska using the eddy covariance method. Seasonal and interannual variations in the gross primary productivity (GPP) and ecosystem respiration (RE) were associated primarily with air temperature: warmer conditions enhanced GPP and RE. Meanwhile, interannual variation in annual CO2 balance was controlled predominantly by RE, and not GPP. During these 9 years of measurement, the annual CO2 balance shifted from a CO2 sink to a CO2 source, with a 9-year average near zero. The increase in autumn RE was associated with autumn warming and was mostly attributed to a shift in the annual CO2 balance. The increase in autumn air temperature (0.22 °C yr(-1)) during the 9 years of study was 15 times greater than the long-term warming trend between 1905 and 2011 (0.015 °C yr(-1)) due to decadal climate oscillation. This result indicates that most of the shifts in observed CO2 fluxes were associated with decadal climate variability. Because the natural climate varies in a cycle of 10-30 years, a long-term study covering at least one full cycle of decadal climate oscillation is important to quantify the CO2 balance and its interaction with the climate.
Related Papers
- → Comparing ecosystem and soil respiration: Review and key challenges of tower-based and soil measurements(2017)151 cited
- → Comparison of eddy covariance and chamber-based methods for measuring CO2 flux in a temperate mixed forest(2009)71 cited
- → Changing temperature response of respiration turns boreal forest from carbon sink into carbon source(2016)62 cited
- → CO<sub>2</sub> flux measurements in Russian Far East tundra using eddy covariance and closed chamber techniques(2003)38 cited
- → Using Eddy Covariance Sensors to Quantify Carbon Metabolism of Peatlands: A Case Study in Turkey(2011)8 cited