Reduction of tropical land region precipitation variability via transpiration
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Author(s)
Lee, Jung-Eun
Lintner, Benjamin R.
Neelin, J. David
Jiang, Xianan
Gentine, Pierre
Boyce, C. Kevin
Fisher, Joshua B.
Perron, J. Taylor
Kubar, Terence L.
Lee, Jeonghoon
Date Issued
October 2012
Journal
Geophysical Research Letters
Publisher
American Geophysical Union (AGU)
Citation
Lee, Jung-Eun, Benjamin R. Lintner, J. David Neelin, Xianan Jiang, Pierre Gentine, C. Kevin Boyce, Joshua B. Fisher, et al. “Reduction of Tropical Land Region Precipitation Variability via Transpiration.” Geophys. Res. Lett. 39, no. 19 (October 16, 2012): n/a–n/a. Copyright © 2012 American Geophysical Union
Version
Final published version
Abstract
Tropical rainforests are known to exhibit low intraseasonal precipitation variability compared with oceanic areas with similar mean precipitation in observations and models. In the present study, the potential role of transpiration for this difference in precipitation variability is investigated using the National Center for Atmospheric Research (NCAR) atmospheric general circulation model. Comparing model results with and without transpiration shows that in the absence of transpiration, mean precipitation decreases as may be expected. However the incidence of both higher daily total column water and more intense precipitation increases without transpiration; consequently the variability of precipitation increases substantially. These results can be understood in terms of the complex interplay of local near-surface and remote moist dynamical processes with both local positive (boundary-layer drying) and large-scale negative (increased large-scale convergence) feedbacks when transpiration is disabled in the model. It is also shown that surface turbulent fluxes over tropical rainforests are highly correlated with incoming solar energy but only weakly correlated with wind speed, possibly decoupling land precipitation from large-scale disturbances like the Madden-Julian Oscillation.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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DOI of Published Version
https://doi.org/10.1029/2012gl053417
