TY - JOUR
T1 - Effects of a groundwater scheme on the simulation of soil moisture and evapotranspiration over southern South America
AU - Martinez, J. Alejandro
AU - Dominguez, Francina
AU - Miguez-Macho, Gonzalo
N1 - Funding Information:
Acknowledgments. We acknowledge the Research Applications Laboratory (RAL) from NCAR–UCAR for providing the Noah-MP code on their website http:// www.ral.ucar.edu/research/land/technology/noahmp_lsm. php. We also acknowledge Dr. Michael Barlage at NCAR for providing support to install and run the model. We acknowledge the ECMWF for providing the ERA-Interim data, GRCTellus for providing the GRACE data, and Landflux.org for providing the ET estimates. GRACE land data are available at http://grace.jpl.nasa.gov, supported by the NASA MEaSUREs Program. We also acknowledge the Land–Climate Dynamics Group at ETH for providing the LandFlux–EVAL data (http://www.iac.ethz.ch/group/land-climate-dynamics/research/landflux-eval.html). We are grateful to James Shuttleworth and Hoshin Gupta for their insightful comments. We also acknowledge the comments and suggestions from the reviewers for helping to improve the present work. This research was supported by NSF Grant AGS 1045260 and NSF CAREER Award AGS 1454089 (Martinez and Dominguez) and by the European Commission FP7 ‘‘EartH2Observe’’ project (Miguez-Macho).
Funding Information:
We acknowledge the Research Applications Laboratory (RAL) from NCAR-UCAR for providing the Noah-MP code on their website http:// www.ral.ucar.edu/research/land/technology/noahmp_lsm. php.We also acknowledge Dr. Michael Barlage at NCAR for providing support to install and run the model. We acknowledge the ECMWF for providing the ERA-Interim data, GRCTellus for providing the GRACE data, and Landflux.org for providing the ET estimates.GRACEland data are available at http://grace.jpl.nasa.gov, supported by theNASAMEaSUREs Program.We also acknowledge the Land-Climate Dynamics Group at ETH for providing the LandFlux-EVAL data (http://www.iac.ethz.ch/group/landclimate-dynamics/research/landflux-eval.html). We are grateful to James Shuttleworth and Hoshin Gupta for their insightful comments. We also acknowledge the comments and suggestions from the reviewers for helping to improve the present work. This researchwas supported byNSF Grant AGS 1045260 and NSF CAREER Award AGS 1454089 (Martinez and Dominguez) and by the European Commission FP7 ''EartH2Observe'' project (Miguez-Macho)
Publisher Copyright:
© 2016 American Meteorological Society.
PY - 2016
Y1 - 2016
N2 - The effects of groundwater dynamics on the representation ofwater 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 theMiguez-Macho and Fan groundwater scheme, anotherwith 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 southernAmazon are improved with one of the groundwater schemes.An increase in the moisture in the top 2m 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 20km. 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.
AB - The effects of groundwater dynamics on the representation ofwater 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 theMiguez-Macho and Fan groundwater scheme, anotherwith 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 southernAmazon are improved with one of the groundwater schemes.An increase in the moisture in the top 2m 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 20km. 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.
KW - Evapotranspiration
KW - Hydrometeorology
KW - Land surface model
KW - Soil moisture
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U2 - 10.1175/JHM-D-16-0051.1
DO - 10.1175/JHM-D-16-0051.1
M3 - Article
AN - SCOPUS:85020636472
SN - 1525-755X
VL - 17
SP - 2941
JO - Journal of Hydrometeorology
JF - Journal of Hydrometeorology
IS - 11
ER -