Eddy covariance measurements of CO2 exchange from agro-ecosystems located in subtropical (India) and boreal (Finland) climatic conditions

2020 ◽  
Vol 129 (1) ◽  
Author(s):  
Pramit Kumar Deb Burman ◽  
Narasinha J Shurpali ◽  
Subharthi Chowdhuri ◽  
Anandakumar Karipot ◽  
Supriyo Chakraborty ◽  
...  
Keyword(s):  
Eddy Covariance ◽  
Co2 Exchange ◽  
Climatic Conditions ◽  
Eddy Covariance Measurements

Cross validation of open-top chamber and eddy covariance measurements of ecosystem CO2 exchange in a Florida scrub-oak ecosystem

2002 ◽  
Vol 9 (1) ◽  
pp. 84-95 ◽  
Author(s):  
Sabina Dore ◽  
Graham J. Hymus ◽  
David P. Johnson ◽  
C. R. Hinkle ◽  
Riccardo Valentini ◽  
...  
Keyword(s):  
Eddy Covariance ◽  
Cross Validation ◽  
Co2 Exchange ◽  
Open Top Chamber ◽  
Florida Scrub ◽  
Scrub Oak ◽  
Eddy Covariance Measurements ◽  
Oak Ecosystem

Legacy effects of drought on gross primary productivity from eddy-covariance measurements

2021 ◽  
Author(s):  
Xin Yu ◽  
René Orth ◽  
Markus Reichstein ◽  
Ana Bastos
Keyword(s):  
Eddy Covariance ◽  
Primary Productivity ◽  
Carbon Balance ◽  
Climatic Conditions ◽  
Gross Primary Productivity ◽  
Legacy Effects ◽  
Ecosystem Carbon ◽  
Ecosystem Carbon Balance ◽  
Eddy Covariance Measurements ◽  
Effects Of Drought

<p>The frequency and severity of droughts are expected to increase in the wake of climate change. Drought events not only cause direct impacts on the ecosystem carbon balance but also result in legacy effects during the following years. These legacies result from, for example, drought damage to the xylem or the crown which causes impaired growth, or from higher vulnerability to pests and diseases. To understand how droughts might affect the carbon cycle in the future, it is important to consider both direct and legacy effects. Such effects likely affect interannual variability in C fluxes but are challenging to detect in observations, and poorly represented in models. Therefore, the patterns and mechanisms inducing the legacy effects of drought on ecosystem carbon balance are necessarily needed to improve.</p><p>In this study, we analyze gross primary productivity (GPP) from eddy-covariance measurements in Germany to detect legacy effects from recent droughts. We follow a data-driven modeling approach using a random forest model trained in different sets of drought and non-drought periods. This approach allows quantifying legacy effects as deviations of observed GPP from modeled GPP in legacy years, which indicates a change in the vegetation response to hydro-climatic conditions as compared with the training period.</p>

scholarly journals Towards a more harmonized processing of eddy covariance CO<sub>2</sub> fluxes: algorithms and uncertainty estimation

2006 ◽  
Vol 3 (4) ◽  
pp. 961-992 ◽  
Author(s):  
D. Papale ◽  
M. Reichstein ◽  
E. Canfora ◽  
M. Aubinet ◽  
C. Bernhofer ◽  
...  
Keyword(s):  
Eddy Covariance ◽  
Ecosystem Respiration ◽  
Gross Primary Production ◽  
Terrestrial Ecosystem ◽  
Uncertainty Estimation ◽  
Climatic Conditions ◽  
High Temporal Resolution ◽  
Forest Sites ◽  
European Database ◽  
Eddy Covariance Measurements

Abstract. Eddy covariance technique to measure CO2, water and energy fluxes between biosphere and atmosphere is widely spread and used in various regional networks. Currently more that 250 eddy covariance sites are active around the world measuring carbon exchange at high temporal resolution for different biomes and climatic conditions. These data are usually acquired using the same method but they need a set of corrections that are often differently applied to each site and in a subjective way. In this paper a new standardized set of corrections are proposed and the uncertainties introduced by these corrections are assessed for 8 different forest sites in Europe with a total of 12 yearly datasets. The uncertainties introduced on the two components GPP (Gross Primary Production) and TER (Terrestrial Ecosystem Respiration) are also discussed and a quantitative analysis presented . The results show that a standardized data processing is needed for an effective comparison across biomes and for underpinning inter-annual variability. The methodology presented in this paper has also been integrated in the European database of the eddy covariance measurements.

scholarly journals Preserving the variance in imputed eddy-covariance measurements: Alternative methods for defensible gap filling

2017 ◽  
Vol 232 ◽  
pp. 635-649 ◽  
Author(s):  
Sujit Kunwor ◽  
Gregory Starr ◽  
Henry W. Loescher ◽  
Christina L. Staudhammer
Keyword(s):  
Eddy Covariance ◽  
Alternative Methods ◽  
Gap Filling ◽  
Eddy Covariance Measurements

scholarly journals Global trends in air-water CO2 exchange over seagrass meadows revealed by atmospheric Eddy Covariance

2020 ◽  
Author(s):  
Bryce R Van Dam ◽  
Pierre Polsenaere ◽  
Aylin Barreras-Apodaca ◽  
Christian Lopes ◽  
Zulia Mayari Sanchez-Mejia ◽  
...  
Keyword(s):  
Eddy Covariance ◽  
Co2 Exchange ◽  
Global Trends ◽  
Seagrass Meadows

Application of an alternative method to derive reliable estimates of nighttime respiration from eddy covariance measurements in moderately complex topography

2008 ◽  
Vol 148 (6-7) ◽  
pp. 1174-1180 ◽  
Author(s):  
Eva van Gorsel ◽  
Ray Leuning ◽  
Helen A. Cleugh ◽  
Heather Keith ◽  
Miko U.F. Kirschbaum ◽  
...  
Keyword(s):  
Eddy Covariance ◽  
Complex Topography ◽  
Alternative Method ◽  
Eddy Covariance Measurements
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