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Assessing the Spatial Variability in Peak Season Co2 Exchange Characteristics Across the Arctic Tundra Using a Light Response Curve Parameterization : Volume 11, Issue 17 (15/09/2014)

By Mbufong, H. N.

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Book Id: WPLBN0003988931
Format Type: PDF Article :
File Size: Pages 16
Reproduction Date: 2015

Title: Assessing the Spatial Variability in Peak Season Co2 Exchange Characteristics Across the Arctic Tundra Using a Light Response Curve Parameterization : Volume 11, Issue 17 (15/09/2014)  
Author: Mbufong, H. N.
Volume: Vol. 11, Issue 17
Language: English
Subject: Science, Biogeosciences
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Aurela, M., Lund, M., Christensen, T. R., Friborg, T., Rasse, D. P., Rocha, A. V.,...Kutzbach, L. (2014). Assessing the Spatial Variability in Peak Season Co2 Exchange Characteristics Across the Arctic Tundra Using a Light Response Curve Parameterization : Volume 11, Issue 17 (15/09/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: Arctic Research Center, Department of Bioscience, Aarhus University, Roskilde, Denmark. This paper aims to assess the spatial variability in the response of CO2 exchange to irradiance across the Arctic tundra during peak season using light response curve (LRC) parameters. This investigation allows us to better understand the future response of Arctic tundra under climatic change. Peak season data were collected during different years (between 1998 and 2010) using the micrometeorological eddy covariance technique from 12 circumpolar Arctic tundra sites, in the range of 64–74° N.

The LRCs were generated for 14 days with peak net ecosystem exchange (NEE) using an NEE–irradiance model. Parameters from LRCs represent site-specific traits and characteristics describing the following: (a) NEE at light saturation (Fcsat), (b) dark respiration (Rd), (c) light use efficiency (Α), (d) NEE when light is at 1000 μmol m−2 s−1 (Fc1000), (e) potential photosynthesis at light saturation (Psat) and (f) the light compensation point (LCP).

Parameterization of LRCs was successful in predicting CO2 flux dynamics across the Arctic tundra. We did not find any trends in LRC parameters across the whole Arctic tundra but there were indications for temperature and latitudinal differences within sub-regions like Russia and Greenland. Together, leaf area index (LAI) and July temperature had a high explanatory power of the variance in assimilation parameters (Fcsat, Fc1000 and Psat, thus illustrating the potential for upscaling CO2 exchange for the whole Arctic tundra. Dark respiration was more variable and less correlated to environmental drivers than were assimilation parameters. This indicates the inherent need to include other parameters such as nutrient availability, substrate quantity and quality in flux monitoring activities.


Summary
Assessing the spatial variability in peak season CO2 exchange characteristics across the Arctic tundra using a light response curve parameterization

Excerpt
Hugelius, G., Bockheim, J. G., Camill, P., Elberling, B., Grosse, G., Harden, J. W., Johnson, K., Jorgenson, T., Koven, C. D., Kuhry, P., Michaelson, G., Mishra, U., Palmtag, J., Ping, C.-L., O'Donnell, J., Schirrmeister, L., Schuur, E. A. G., Sheng, Y., Smith, L. C., Strauss, J., and Yu, Z.: A new data set for estimating organic carbon storage to 3 m depth in soils of the northern circumpolar permafrost region, Earth Syst. Sci. Data, 5, 393–402, doi:10.5194/essd-5-393-2013, 2013.; Humphreys, E. R., Lafleur, P. M., Flanagan, L. B., Hedstrom, N., Syed, K. H., Glenn, A. J., and Granger, R.: Summer carbon dioxide and water vapor fluxes across a range of northern peatlands, J. Geophys. Res.-Biogeo., 111, G04011, doi:10.1029/2005JG000111, 2006.; IPCC: Summary for policymakers, in: Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Stocker, T. F., Qin, D., Plattner, G.-K., Tignor, M., Allen, S. K., Boschung, J., Nauels, A., Xia, Y., Bex, V., and Midgley, P. M., Cambridge, 1–29, 2013.; Jacovides, C. P., Tymvios, F. S., Asimakopoulos, D. N., Theofilou, K. M., and Pashiardes, S.: Global photosynthetically active radiation and its relationship with global solar radiation in the Eastern Mediterranean basin, Theor. Appl. Climatol., 74, 227–233, 2003.; Jones, M. H., Fahnestock, J. T., and Welker, J. M.: Early and late winter CO2 efflux from arctic tundra in the Kuparuk River watershed, Alaska, USA, Arct. Antarct. Alp. Res., 31, 187–190, 1999.; Kiepe, I., Friborg, T., Herbst, M., Johansson, T., and Soegaard, H.: Modeling Canopy CO2 Exchange in the European Russian Arctic, Arc. Antarc. Alp. Res., 45, 50–63, 2013.; Kuhry, P., Ping, C. L., Schuur, E. A. G., Tarnocai, C., and Zimov, S.: Report from the International Permafrost Association: carbon pools in permafrost regions, Permafrost Periglac., 20, 229–234, 2009.; Lafleur, P. M. and Humphreys, E. R.: Spring warming and carbon dioxide exchange over low Arctic tundra in central Canada, Glob. Change Biol., 14, 740–756, 2008.; Kutzbach, L., Wille, C., and Pfeiffer, E.-M.: The exchange of carbon dioxide between wet arctic tundra and the atmosphere at the Lena River Delta, Northern Siberia, Biogeosciences, 4, 869–890, doi:10.5194/bg-4-869-2007, 2007.; Kwon, H. J., Oechel, W. C., Zulueta, R. C., and Hastings, S. J.: Effects of climate variability on carbon sequestration among adjacent wet sedge tundra and moist tussock tundra ecosystems, J. Geophys. Res.-Biogeo., 111, G03014, doi:10.1029/2005JG000036, 2006.; Lafleur, P. M., Humphreys, E. R., St Louis, V. L., Myklebust, M. C., Papakyriakou, T., Poissant, L., Barker, J. D., Pilote, M., and Swystun, K. A.: Variation in peak growing season net ecosystem production across the Canadian Arctic, Environ. Sci. Technol., 46, 7971–7977, 2012.; Laurila, T., Soegaard, H., Lloyd, C. R., Aurela, M., Tuovinen, J. P., and Nordstroem, C.: Seasonal variations of net CO2 exchange in European Arctic ecosystems, Theor. Appl. Climatol., 70, 183–201, 2001.; Lindroth, A., Lund, M., Nilsson, M., Aurela, M., Christensen, T. R., Laurila, T., Rinne, J., Riutta, T., Sagerfors, J., Strom, L., Tuovinen, J. P., and Vesala, T.: Environmental controls on the CO2 exchange in north European mires, Tellus B, 59, 812–825, 2007.; Loranty, M. M., Goetz, S. J., Rastetter, E. B., Rocha, A. V., Shaver, G. R., Humphreys, E. R., and Lafleur, P. M.: Scaling an instantaneous model of Tundra NEE to the Arctic landscape, Ecosystems, 14, 76–93, 2011.; Lund, M., Falk, J. M., Friborg, T., Mbufong, H. N., Sigsgaard, C., Soegaard, H., and Ta

 

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