Articles | Volume 24, issue 11
https://doi.org/10.5194/hess-24-5579-2020
https://doi.org/10.5194/hess-24-5579-2020
Research article
 | 
24 Nov 2020
Research article |  | 24 Nov 2020

Rapid reduction in ecosystem productivity caused by flash droughts based on decade-long FLUXNET observations

Miao Zhang and Xing Yuan

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Cited articles

Baldocchi, D., Wilson, K., Valentini, R., Law, B., Munger, W., Davis, K., Wofsy, S., Pilegaard, K., Goldstein, A., Falge, E., Vesala, T., Hollinger, D., Running, S., Fuentes, J., Katul, G., Gu, L., Verma, S., Paw, K. T., Malhi, Y., Anthoni, P., Oechel, W., Schmid, H. P., Bernhofer, C., Meyers, T., Evans, R., Olson, R., and Lee, X.: FLUXNET: A New Tool to Study the Temporal and Spatial Variability of Ecosystem–Scale Carbon Dioxide, Water Vapor, and Energy Flux Densities, B. Am. Meteorol. Soc., 82, 2415–2434, https://doi.org/10.1038/s41597-020-0534-3, 2002. 
Banerjee, O., Bark, R., Connor, J., and Crossman, N. D.: An ecosystem services approach to estimating economic losses associated with drought, Ecol. Econ., 91, 19–27, https://doi.org/10.1016/j.ecolecon.2013.03.022, 2013. 
Barnes, M. L., Moran, M. S., Scott, R. L., Kolb, T. E., Ponce-Campos, G. E., Moore, D. J. P., Ross, M. A., Mitra, B., and Dore, S.: Vegetation productivity responds to sub-annual climate conditions across semiarid biomes, Ecosphere, 7, 1–20, https://doi.org/10.1002/ecs2.1339, 2016. 
Basara, J. B., Christian, J. I., Wakefield, R. A., Otkin, J. A., Hunt, E. H. H., and Brown, D. P.: The evolution, propagation, and spread of flash drought in the Central United States during 2012, Environ. Res. Lett., 14, 084025, https://doi.org/10.1088/1748-9326/ab2cc0, 2019. 
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Short summary
We identify flash drought events by considering the decline rate of soil moisture and the drought persistency, and we detect the response of ecosystem carbon and water fluxes to flash droughts based on FLUXNET observations. We find rapid declines in carbon assimilation within 16–24 d of flash drought onset, where savannas show the highest sensitivity. Water use efficiency increases for forests but decreases for herbaceous ecosystems during the recovery stage of flash droughts.