Impacts of a Groundwater Scheme on Hydroclimatological Conditions over Southern South America

Martínez, J. Alejandro; Domínguez, Francina; Míguez-Macho, Gonzalo

doi:10.1175/jhm-d-16-0052.1

Cited by 15 publications

(22 citation statements)

References 52 publications

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“…Since the ERA-Interim biases are likely to affect our simulations with different model configurations in a similar way, the differences between simulations are expected to be mostly due to the model configurations. Our subsequent study with a coupled land-atmosphere system (WRF-Noah-MP; Martinez et al 2016) supports this hypothesis.…”

Section: Model Configurationmentioning

confidence: 55%

“…Our study suggests that, taking into account the strong coupling of surface conditions and precipitation over the La Plata basin (Sörensson and Menéndez 2011), a groundwater scheme could also impact the simulation of the rainy season in climate simulations, including the precipitation recycling during droughts. This is the focus of our companion paper (Martinez et al 2016). …”

Section: Summary and Discussionmentioning

confidence: 89%

“…The LPB extends over parts of five countries, is the second-largest system in South America, and its water resources are a key component of the economy of the region, which is one of the most densely populated areas in South America (Berbery and Barros 2002). The southern Amazon and centraleastern Brazil play important roles in the local and regional climate, in particular because of its connection with the South American monsoon system (e.g., Marengo et al 2012;Collini et al 2008;Vera et al 2006) and the transport of water vapor to the La Plata basin (e.g., Marengo et al 2004;Martinez and Dominguez 2014).…”

Section: A Region Of Studymentioning

confidence: 99%

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

Martínez

Domínguez²,

Míguez-Macho

2016

Journal of Hydrometeorology

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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.

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Section: Model Configurationmentioning

confidence: 55%

Section: Summary and Discussionmentioning

confidence: 89%

Section: A Region Of Studymentioning

confidence: 99%

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

Martínez

Domínguez²,

Míguez-Macho

2016

Journal of Hydrometeorology

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“…At larger scales, enhanced terrestrial moisture can increase atmospheric specific humidity through evapotranspiration (ET) and later contribute to precipitation as this moisture is advected to other regions. The role of ET as a source of moisture for precipitation has been investigated for many regions of the world (Brubaker et al 1993;Brubaker 2006, 2007;Gimeno et al 2010Gimeno et al , 2012van der Ent et al 2010van der Ent et al , 2013Martinez and Dominguez 2014;Dominguez et al 2016;Hu and Dominguez 2015). The pioneering work of Salati et al (1979) highlighted the importance of the Amazon forest transpiration for precipitation.…”

Section: Introductionmentioning

confidence: 99%

Investigating Land Surface Effects on the Moisture Transport over South America with a Moisture Tagging Model

Yang

Domínguez²

2019

Journal of Climate

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Land–atmosphere interactions are a critical component of precipitation processes within the Amazon basin and La Plata River basin (LPRB) in South America. Two of the possible pathways through which the land surface can affect precipitation are 1) by changing the amount of moisture available for precipitation (moisture recycling) and 2) by changing the atmospheric thermal structure and consequently affecting circulation patterns. In this study, the Weather Research and Forecasting (WRF) Model with embedded water vapor tracers (WVT) is used to disentangle these relative contributions, with a particular focus on the precipitation of LPRB. Using WRF-WVT we track the moisture that originates from the Amazon basin over a 10-yr period. It is estimated that Amazon evapotranspiration (ET) contributes to around 30% of the total precipitation over the Amazon and around 16% over the LPRB. Focusing on large-scale circulation patterns that transport moisture into the LPRB, we show that land surface conditions in northwestern Argentina are critical for the meridional transport of moisture to higher latitudes via Chaco jet events (CJEs). Warm surface air temperature associated with dry soil moisture over northwestern Argentina is linked to enhanced CJE northerly low-level winds that intensify moisture transport by changing continental-scale circulation patterns. WRF sensitivity tests confirm that soil moisture variations over this region affect meridional moisture transport.

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“…The shallower the groundwater table depth was, the earlier a high‐moisture zone formed and with a higher soil moisture content (Miao et al, 2017). The effect of groundwater on soil moisture content in the root zone depends on the GTD (Chen and Hu, 2004), and shallower groundwater tables lead to upward capillary fluxes over parts of the central and southern La Plata basin, which leads to an increase in simulated moisture in the root zone (Martinez et al, 2016). Groundwater has an important effect on soil moisture variation, while soil moisture variations are closely related to the process of soil freezing and thawing.…”

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confidence: 99%

Simulation of Soil Freezing and Thawing for Different Groundwater Table Depths

Chen

Gao

Zheng

et al. 2019

Vadose Zone Journal

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Core Ideas The SHAW model was used to simulate the freeze–thaw process during freeze–thaw periods. It revealed the effects of soil texture and groundwater table depth on soil freezing and thawing. The frost depth and accumulated negative soil surface temperature relationship was determined. During freeze–thaw periods, the transformation between phreatic water and soil water will change the soil hydrothermal properties and affect the soil freezing and thawing in shallow groundwater areas. The purpose of this study was to determine the effect of four different groundwater table depths (GTDs) and two soil textures on the process of soil freezing and thawing during two successive freeze–thaw periods using the Simultaneous Heat and Water (SHAW) model. The results show that the frost depth was the maximum when the GTD was 1.0 m, and the maximum frost depths of sandy loam and fine sand were 97.6 and 98.9 cm, respectively. When the GTD was larger than 1.5 m, the maximum frost depth decreased with an increase in GTD, and the maximum frost depth of the soil profile was more sensitive to changes in the air temperature. The frost depth of the soil profile was linear with the square root of the accumulated negative soil surface temperature (ANST) under different GTDs. The ANST was influenced by the phreatic evaporation, and the soil freezing rate increased with an increase in GTD under the same ANST. This research is significant for the rational development of soil water and heat resources and the study of soil water–heat transfer in shallow groundwater areas.

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Impacts of a Groundwater Scheme on Hydroclimatological Conditions over Southern South America

Cited by 15 publications

References 52 publications

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

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

Investigating Land Surface Effects on the Moisture Transport over South America with a Moisture Tagging Model

Simulation of Soil Freezing and Thawing for Different Groundwater Table Depths

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