Climate Control of Terrestrial Ecosystem CO2 Exchanges
Relationships between climate and the net exchange of carbon dioxide (CO2) between the atmosphere and biosphere on yearly to decadal scales are poorly known. This is a critical knowledge gap for models used to estimate long-term climate change impacts on both the biosphere and the rate of change of CO2 in the atmosphere. Here we present data describing the relationships between net ecosystem exchange of carbon (NEE) and climate factors as measured using the eddy covariance method at 125 unique sites in various ecosystems over 6 continents with a total of 559 site-years. We find that NEE observed at eddy covariance sites is (1) a strong function of mean annual temperature at mid- and high-latitudes, (2) a strong function of dryness at mid- and low-latitudes, and (3) a function of both temperature and dryness around the mid-latitudinal belt (45oN). The sensitivity of NEE to mean annual temperature also breaks down at a threshold value of ~16oC, above which no further increase of CO2 uptake with temperature was observed and dryness influence overrules temperature influence.
This was supported by U.S. National Science Foundation (NSF-DEB-0949637)
Yi, C., D. Ricciuto, R. Li, J. Wolbeck, X. Xu, M. Nilsson, L. Aires, J. D. Albertson, C. Ammann, M. A. Arain, A. C. de Araujo, M. Aubinet, M. Aurela, Z. Barcza, A. Barr, P. Berbigier, J. Beringer, C. Bernhofer, A. T. Black, P. V. Bolstad, F. C. Bosveld, M. S. J. Broadmeadow, N. Buchmann, S. P. Burns, P. Cellier, J.M. Chen, J.Q. Chen, P. Ciais, R. Clement, B. D. Cook, P. S. Curtis, D. B. Dail, E. Dellwik, N. Delpierre, A. R. Desai, S. Dore, D. Dragoni, B. G. Drake, E. Dufrêne, A. Dunn, J. Elbers, W. Eugster, M. Falk, C. Feigenwinter, L. B. Flanagan, T. Foken, J. Frank, J. Fuhrer, D. Gianelle, A. Goldstein, M. Goulden, A. Granier, T. Grünwald, L. Gu, H. Guo, A. Hammerle, S. Han, N. P Hanan, L. Haszpra, B. Heinesch, C. Helfter, D. Hendriks, L. B. Hutley, A. Ibrom, C. Jacobs, T. Johansson, M. Jongen, G. Katul, G. Kiely, K. Klumpp, A. Knohl, T. Kolb, W. L. Kutsch, P. Lafleur, T. Laurila, R. Leuning, A. Lindroth, H. Liu, B. Loubet, G. Manca, M. Marek, H. A. Margolis, T. A. Martin, W. J Massman, R. Matamala, G. Matteucci, H. McCaughey, L. Merbold, T. Meyers, M. Migliavacca, F. Miglietta, L. Misson, M. Mölder, J. Moncrieff, R. K. Monson, L. Montagnani, M. Montes-Helu, E. Moors, Ch. Moureaux, M. M Mukelabai, J. W. Munger, M. Myklebust, Z. Nagy, A. Noormets, W. Oechel, R. Oren, S. G. Pallardy, K. T. Paw U, J. S. Pereira, K. Pilegaard, K. Pintér, C. Pio, G. Pita, T. L. Powell, S. Rambal, J. T. Randerson, C. von Randow, C. Rebmann, J. Rinne, F. Rossi, N. Roulet, R. J. Ryel, J. Sagerfors, N. Saigusa, M. J. Sanz, G.S. Mugnozza, H. P. Schmid, G. Seufert, M. Siqueira, J. F. Soussana, G. Starr, M. A. Sutton, J. Tenhunen, Z. Tuba, J. P. Tuovinen, R.Valentini, C. S. Vogel, J. Wang, S. Wang, W. Wang, L. R. Welp, X. Wen, S. Wharton, M. Wilkinson, C. A. Williams, G. Wohlfahrt, S. Yamamoto, G. Yu, R. Zampedri, B. Zhao, X. Zhao, Climate control of terrestrial carbon exchange across biomes and continents, Environmental Research Letters, 5, doi: 10.1088/1748-9326/5/3/034007, 2010.
Ecosystem carbon flux linked to climate