Summary
High-resolution model simulations were performed with the quadruple-nested version of the mesoscale model KAMM to investigate the impact of the new storage lake ‘Embalse Puclaro’ on the arid environment. The storage lake covers an area of 1 to 2 km in width and about 7 km in length. Model simulations were performed for a summer and a winter day.
Due to a change in the surface properties, the installation of the storage lake resulted in a modification of the energy balance. Above the lake area, a stably stratified atmosphere establishes during the day and unstable stratification during the night. During the day, the latent heat flux is similar to that of the replaced cultivated ground, but is higher at the night. The influence of the storage lake on temperature and humidity can be seen to a height of about 300 m above ground level. During the night, water vapour accumulation results in relative humidity values of 100%, as a result a greater number of days with fog above the storage lake is likely when compared to the surrounding area. The storage lake does not produce its own lake breeze during the day, because the larger-scale up-valley wind is too dominant. However, a significant modification of the nocturnal down-valley wind above the lake area can be observed, especially in summer. As a consequence of the larger-scale valley wind system, the influence of the storage lake on the temperature, humidity, and wind field can be identified up to about 4 km on the downwind side.
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Bischoff-Gauß, I., Kalthoff, N. & Fiebig-Wittmaack, M. The influence of a storage lake in the Arid Elqui Valley in Chile on local climate. Theor. Appl. Climatol. 85, 227–241 (2006). https://doi.org/10.1007/s00704-005-0190-8
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DOI: https://doi.org/10.1007/s00704-005-0190-8