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    Effects of a Groundwater Scheme on the Simulation of Soil Moisture and Evapotranspiration over Southern South America

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    Author
    Martinez, J. Alejandro
    Dominguez, Francina
    Miguez-Macho, Gonzalo
    Affiliation
    Univ Arizona, Dept Atmospher Sci
    Issue Date
    2016-11
    
    Metadata
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    Publisher
    AMER METEOROLOGICAL SOC
    Citation
    Effects of a Groundwater Scheme on the Simulation of Soil Moisture and Evapotranspiration over Southern South America 2016, 17 (11):2941 Journal of Hydrometeorology
    Journal
    Journal of Hydrometeorology
    Rights
    © 2016 American Meteorological Society
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The effects of groundwater dynamics on the representation of water storage and evapotranspiration (ET) over southern South America are studied from simulations with the Noah-MP land surface model. The model is run with three different configurations: one including the Miguez-Macho and Fan groundwater scheme, another with the Simple Groundwater Model (SIMGM), and the other with free drainage at the bottom of the soil column. The first objective is to assess the effects of the groundwater schemes using a grid size typical of regional climate model simulations at the continental scale (20 km). The phase and amplitude of the fluctuations in the terrestrial water storage over the southern Amazon are improved with one of the groundwater schemes. An increase in the moisture in the top 2 m of the soil is found in those regions where the water table is closer to the land surface, including the western and southern Amazon and the La Plata basin. This induces an increase in ET over the southern La Plata basin, where ET is water limited. There is also a seasonal increase in ET during the dry season over parts of the southern Amazon. The second objective is to assess the role of the horizontal resolution on the effects induced by the Miguez-Macho and Fan groundwater scheme using simulations with grid sizes of 5 and 20 km. Over the La Plata basin, the effect of groundwater on ET is amplified at the 5-km resolution. Notably, over parts of the Amazon, the groundwater scheme increases ET only at the higher 5-km resolution.
    Note
    Published Online: 29 November 2016; 6 Month Embargo.
    ISSN
    1525-755X
    1525-7541
    DOI
    10.1175/JHM-D-16-0051.1
    Version
    Final published version
    Sponsors
    NSF [AGS 1045260]; NSF CAREER [AGS 1454089]; European Commission
    Additional Links
    http://journals.ametsoc.org/doi/10.1175/JHM-D-16-0051.1
    ae974a485f413a2113503eed53cd6c53
    10.1175/JHM-D-16-0051.1
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