TY - JOUR AU - Armani, Fernando Augusto Silveira AU - Dias, Nelson Luís AU - Vissotto Junior, Dornelles PY - 2020/08/28 Y2 - 2024/03/28 TI - Similarity between turbulent fluctuations of scalars in lake environment JF - Ciência e Natura JA - CeN VL - 42 IS - 0 SE - Special Edition DO - 10.5902/2179460X45355 UR - https://periodicos.ufsm.br/cienciaenatura/article/view/45355 SP - e13 AB - <p>This paper presents an evaluation of scalar similarity and scalar flux similarity of measurements above the water surface of the Itaipu hydroelectric reservoir. The scalars studied were: CO<sub>2 </sub>mixing ratio (<em>r<sub>c</sub></em>), air temperature (<em>θ</em>), specific air humidity (<em>q</em>) and the vertical wind velocity (<em>w</em>). With the variance method it was found that the vertical wind velocity is in agreement with Monin-Obukhov Similarity Theory. On the other hand, the other scalars presented larger deviations in relation to the theoretical prediction. The worst results were for air temperature and mixing ratio of CO<sub>2</sub>. The most similar scalars were <em>θ</em> and <em>q</em>, with the most frequent correlation coefficient varying in the range [0.55:0.64] for measurements in unstable atmospheric conditions and in the [−0.85:−0.75] range for measurements under stable atmospheric conditions. Regarding the scalar fluxes, they presented greater similarity to each other than the scalars themselves.</p> ER -