Irrigation impact on precipitation during a heatwave event using WRF-ARW: The summer 2015 Po Valley case

Valmassoi, Arianna; Dudhia, Jimy; Sabatino, Silvana Di; Pilla, Francesco

doi:10.1016/j.atmosres.2020.104951

Cited by 13 publications

(13 citation statements)

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“…The influences of irrigation on precipitation were also uncertain. The specific reason as follows: the wetting and cooling effects of irrigation exerted positive and negative influences on local precipitation, respectively (Harding & Snyder, 2012; Marcella & Eltahir, 2014; Valmassoi et al., 2020b; Wu et al., 2018; B. Yang et al., 2016; X. Zhang et al., 2017), and the final influences were closely related to the local climatic background and geographical conditions. Because of the complexity of climate system, the spatial distributions of regional precipitation changes caused by irrigation were very heterogeneous and had no obvious regularity (Qian et al., 2013; Wu et al., 2018; X. Zhang et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

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Regional Climate Effects of Irrigation Over Central Asia Using Weather Research and Forecasting Model

2022

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has special geomorphology features of mountains and basins, where the primary water resources (snow, glaciers, etc.) are distributed in the mountainous areas, which are called as the "water tower of Central Asia" (Sorg et al., 2012). Rivers like Syr Darya and Amu Darya, which are formed by the melting water of mountains snow-glaciers, flow into low-altitude areas and provide important water sources for the croplands widely distributed in arid regions of Central Asia. The precipitation in Central Asia is mainly concentrated in mountainous areas and is scarce in the low-lying deserts and oases (Bohner, 2006). Therefore, the croplands of Central Asia must be irrigated to meet the normal growth of crops. Irrigation not only increases the water vapor content in boundary layer, but also affects the partitioning of surface energy, which produces important impacts on local and regional climate (

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Section: Introductionmentioning

confidence: 99%

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Regional Climate Effects of Irrigation Over Central Asia Using Weather Research and Forecasting Model

2022

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“…The height of the convective mixed layer is reduced by a third, from an averaged value of 1.5 km (in the control simulation) to less than 1 km (for case shown, Figure 7b). Such a reduction impacts the atmospheric dynamics, as well as the convection, and this is analysed in depth in Valmassoi et al [58]. However, these changes also affect the mixing height and the local dispersion.…”

Section: Atmospheric Pollutionmentioning

confidence: 99%

“…From July 2015 output, all the irrigated grid points with low precipitation differences from the control (less than |30 mm|) are considered. The threshold, 30 mm, is a value close to the upper limit of the July accumulated precipitation in the control run [58]. The fields are then spatially averaged for the irrigated region to avoid auto-correlations.…”

Section: On the Role Of Soil Moisturementioning

confidence: 99%

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Regional Climate Impacts of Irrigation in Northern Italy Using a High Resolution Model

et al. 2020

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Irrigation is crucial for sustaining agriculture in certain regions; however, there are effects on the local climate. Previous studies discussed that the irrigation signal might depend on the geographical region as well as the synoptic and climatic conditions. The work presented here aims to investigate the mechanisms behind changes in the irrigation impact on the local conditions depending on synoptic changes. Different to previous works, this employs convection-permitting simulations. Irrigation processes are parameterized in three different ways depending on the evaporative loss. The region of focus is in northern Italy (Po Valley), which is of interest for both the soil-atmosphere coupling strength and widely used irrigation. The simulation period is Summer 2015 (May–July), which includes a heatwave month (July) and an average month (June). The results show how irrigation prevented the drying out of the soil layers during the heatwave. This influences the surface flux partition differently, by increasing moisture flux and decreasing the sensible heat flux. In general, the irrigation impact magnitude, with respect to the control simulation, is more than double in July compared to June. This study discusses climate implications for the region, such as the impact of widespread irrigation on the vegetation health, the heatwave feedback mechanism, atmospheric pollution, and human heat discomfort.

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Irrigation impact on boundary layer and precipitation characteristics in Weather Research and Forecasting model simulations during LIAISE‐2021

Udina,

Peinó,

Polls

et al. 2024

Quart J Royal Meteoro Soc

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The Land Surface Interactions with the Atmosphere over the Iberian Semi‐arid Environment (LIAISE) campaign examined the impact of anthropization on the water cycle in terms of land–atmosphere–hydrology interactions. The objective of this study is to assess the effects of irrigation on the atmosphere and on precipitation in Weather Research and Forecasting model simulations during the LIAISE special observation period in July 2021. Comparisons between simulations and observations show better verification scores for air temperature, humidity, and wind speed and direction when the model included the irrigation parametrization, improving the model warm and dry bias at 2 m over irrigated areas. Other changes found are the weakening of the sea breeze circulation and a more realistic surface energy partitioning representation. The boundary‐layer height is lowered in the vicinity of irrigated areas, causing a decrease in the lifting condensation level and the level of free convection, which induce increases in convective available potential energy and convective inhibition. Precipitation differences between simulations become relevant for smaller areas, close to the irrigated land. When convection is parametrized, simulations including irrigation tend to produce a decrease in rainfall (negative feedback), whereas convection‐permitting simulations produce an increase (positive feedback), although the latter underestimates substantially the observed precipitation field. In addition, irrigation activation decreases the areas exceeding moderate hourly precipitation intensities in all simulations. There is a local impact of irrigated land on model‐resolved precipitation accumulations and intensities, although including the irrigation parametrization did not improve the representation of the observed precipitation field, as probably the precipitation systems during the LIAISE special observation period in July 2021 were mostly driven by larger scale perturbations or mesoscale systems, more than by local processes. Results reported here not only contribute to enhance our understanding of irrigation effects upon precipitation but also demonstrate the need to include irrigation parametrizations in numerical forecasts to overcome the biases found.

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Irrigation impact on precipitation during a heatwave event using WRF-ARW: The summer 2015 Po Valley case

Cited by 13 publications

References 30 publications

Regional Climate Effects of Irrigation Over Central Asia Using Weather Research and Forecasting Model

Regional Climate Effects of Irrigation Over Central Asia Using Weather Research and Forecasting Model

Regional Climate Impacts of Irrigation in Northern Italy Using a High Resolution Model

Irrigation impact on boundary layer and precipitation characteristics in Weather Research and Forecasting model simulations during LIAISE‐2021

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