World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

On the Choice of the Driving Temperature for Eddy-covariance Carbon Dioxide Flux Partitioning : Volume 9, Issue 7 (31/07/2012)

By Lasslop, G.

Click here to view

Book Id: WPLBN0003977033
Format Type: PDF Article :
File Size: Pages 45
Reproduction Date: 2015

Title: On the Choice of the Driving Temperature for Eddy-covariance Carbon Dioxide Flux Partitioning : Volume 9, Issue 7 (31/07/2012)  
Author: Lasslop, G.
Volume: Vol. 9, Issue 7
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Ibrom, A., Reichstein, M., Migliavacca, M., Bohrer, G., Wohlfahrt, G., Cescatti, A.,...Kolari, P. (2012). On the Choice of the Driving Temperature for Eddy-covariance Carbon Dioxide Flux Partitioning : Volume 9, Issue 7 (31/07/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Max Planck Institute for Biogeochemistry, Biogeochemical Model-Data Integration Group, Jena, Germany. Networks that merge and harmonise eddy-covariance measurements from many different parts of the world have become an important observational resource for ecosystem science. Empirical algorithms have been developed which combine direct observations of the net ecosystem exchange of carbon dioxide with simple empirical models to disentangle photosynthetic (GPP) and respiratory fluxes (Reco). The increasing use of these estimates for the analysis of climate sensitivities, model evaluation, and calibration demands a thorough understanding of assumptions in the analysis process and the resulting uncertainties of the partitioned fluxes. The semi-empirical models used in flux partitioning algorithms require temperature observations as input, but as respiration takes place in many parts of an ecosystem, it is unclear which temperature input – air, surface, bole, or soil at a specific depth – should be used. This choice is a source of uncertainty and potential biases.

In this study we analysed the correlation between different temperature observations and nighttime NEE (which equals nighttime respiration) across FLUXNET sites to understand the potential of the different temperature observations as input for the flux partitioning model. We found that the differences in the correlation between different temperature data streams and nighttime NEE are small and depend on the selection of sites. We investigated the effects of the choice of the temperature data by running two flux partitioning algorithms with air and soil temperature. We found the time lag (phase shift) between air and soil temperatures explains the differences in the GPP and Reco estimates when using either air or soil temperatures for flux partitioning. The impact of the source of temperature data on other derived ecosystem parameters was estimated, and the strongest impact was found for the temperature sensitivity. Overall, this study suggests that the choice between soil or air temperature must be made on site-by-site basis by analysing the correlation between temperature and nighttime NEE. We recommend using an ensemble of estimates based on different temperature observations to account for the uncertainty due to the choice of temperature and to assure the robustness of the temporal patterns of the derived variables.


Summary
On the choice of the driving temperature for eddy-covariance carbon dioxide flux partitioning

Excerpt
Akaike, H.: Information theory and an extention of the maximum likelihood principle, 2nd International Symposium on Information Theory, 267–281, http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.55.71%81, 1973.; Allison, V. J., Miller, R. M., Jastrow, J. D., Matamala, R., and Zak, D. R.: Changes in soil microbial community structure in a tallgrass prairie chronosequence, Soil Sci. Soc. Am. J., 69, 1412–1421, 2005.; Anderson, D., Burnham, K., and Thompson, W.: Null hypothesis testing: problems, prevalence, and an alternative, Journal of Wildlife Management, 64, 912–923, 2000.; Anthoni, P. M., Knohl, A., Rebmann, C., Freibauer, A., Mund, M., Ziegler, W., Kolle, O., and Schulze, E. D.: Forest and agricultural land-use-dependent CO2 exchange in Thuringia, Germany, Glob. Change Biol., 10, 2005–2019, 2004.; Arain, M. A. and Restrepo-Coupe, N.: Net ecosystem production in a temperate pine plantation in southeastern Canada, Agr. Forest Meteorol., 128, 223–241, 2005.; Aubinet, M., Chermanne, B., Vandenhaute, M., Longdoz, B., Yernaux, M., and Laitat, E.: Long term carbon dioxide exchange above a mixed forest in the Belgian Ardennes, Agr. Forest Meteorol., 108, 293–315, 2001.; Aurela, M., Riutta, T., Laurila, T., Tuovinen, J. P., Vesala, T., Tuittila, E. S., Rinne, J., Haapanala, S., and Laine, J.: CO2 exchange of a sedge fen in southern Finland - The impact of a drought period, Tellus B, 59, 826–837, 2007.; Beer, C., Reichstein, M., Tomelleri, E., Ciais, P., Jung, M., Carvalhais, N., Rodenbeck, C., Arain, M. A., Baldocchi, D., Bondeau, G. B. B. A., Cescatti, A., Lasslop, G., Lindroth, A., Lomas, M., Luyssaert, S., Margolis, H., Oleson, K. W., Roupsard, O., Veenendaal, E., Viovy, N., Williams, C., Woodward, F. I., and Papale, D.: Terrestrial Gross Carbon Dioxide Uptake: Global Distribution and Covariation with Climate, Science, 329, 834–838, doi:10.1126/science.1184984, 2010.; Bergeron, O., Margolis, H., Black, T., Coursolle, C., Dunn, A., Barr, A., and Wofsy, S.: Comparison of carbon fluxes over three boreal black spruce forests in Canada, Glob. Change Biol., 13, 89–107, 2007.; Black, T. A., Chen, W. J., Barr, A. G., Arain, M. A., Chen, Z., Nesic, Z., Hogg, E. H., Neumann, H. H., and Yang, P. C.: Increased carbon sequestration by a boreal deciduous forest in years with a warm spring, Geophys. Res. Lett., 27, 1271–1274, 2000.; Bolstad, P., Davis, K., Martin, J., Cook, B., and Wang, W.: Component and whole-system respiration fluxes in northern deciduous forests, Tree Physiol., 24, 493–504, 2004.; Bonan, G. B., Lawrence, P. J., Oleson, K. W., Levis, S., Jung, M., Reichstein, M., Lawrence, D. M., and Swenson, S. C.: Improving canopy processes in the Community Land Model version 4 (CLM4) using global flux fields empirically inferred from FLUXNET data, J. Geophys. Res., 116, G02014, doi:10.1029/2010JG001593, 2011.; Bracho, R., Starr, G., Gholz, H., Martin, T., Cropper Jr., W., and Loescher, H.: Controls on carbon dynamics by ecosystem structure and climate for southeastern U.S. slash pine plantations, Ecol. Monographs, 82, 101–128, 2012.; Chiesi, M., Maselli, F., Bindi, M., Fibbi, L., Cherubini, P., Arlotta, E., Tirone, G., Matteucci, G., and Seufert, G.: Modelling carbon budget of Mediterranean forests using ground and remote sensing measurements, Agricultural and Forest Meteorology, 135, 22–34, 2005.; Cook, B. D., Davis, K. J., Wang, W. G., Desai, A., Berger, B. W., Teclaw, R. M., Martin, J. G., Bolstad, P. V., Bakwin, P. S., Yi, C. X.


 

Click To View

Additional Books


  • An Empirical Model Simulating Long-term ... (by )
  • Dust Deposition: Iron Source or Sink? a ... (by )
  • Spatial and Temporal Aspects of Greenhou... (by )
  • Relationship Between N : P : Si Ratio an... (by )
  • Mats of Psychrophilic Thiotrophic Bacter... (by )
  • A Comparison of the Variability of Biolo... (by )
  • Deep-sea Benthic Ecosystem Collapse and ... (by )
  • Distribution of Methane in the Lena Delt... (by )
  • Effect of Ocean Acidification on the Fat... (by )
  • Estimating Temporal and Spatial Variatio... (by )
  • Current State and Future Scenarios of th... (by )
  • Soil Organic Carbon in the Sanjiang Plai... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.