Publication: Thermally-driven mesoscale flows and their interaction with atmospheric boundary layer turbulence
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2019-04-29
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Universidad Complutense de Madrid
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Abstract
Los movimientos atmosféricos se clasifican de acuerdo a su escala espacial y temporal de mayor a menor en macroescalares, mesoescalares y microescalares. Entre los procesos mesoescalares encontramos los flujos térmicos, producidos por contrastes térmicos horizontales en escalas que abarcan entre 1 y 100–200 km aproximadamente, y que ocurren en forma de circulaciones cerradas. Estos flujos juegan un papel críticoen la transferencia de energía entre la macroescala y microescala. En esta tesis investigamos las brisas marinas (SBs) y de montaña (MBs). Además de ser ubicuas, juegan un papel fundamental en el complejo decaimiento de la turbulencia que tiene lugar durante la transición vespertina (AET) de la capa límite atmosférica (ABL). Íntimamenterelacionado con la interacción entre los flujos mesoescalares y la turbulencia en la ABL, la concentración de escalares relevantes como el CO2 puede verse significativamente alterada por el establecimiento de circulaciones térmicas. Modelos mesoescalares tales como el Weather Research & Forecasting (WRF) muestran deficiencias en reproducir el decaimiento de turbulencia durante la AET y la influencia de los flujos mesoescalares en el balance de CO2...
Atmospheric motions are classified according to their spatial and time scales from largest to smallest into macroscales, mesoscales and microscales. Among mesoscale motions we find the thermally-driven flows, which are driven by horizontal thermal contrasts in scales between around 1 and 100–200 km, and occur in the form of closed circulations. They have a critical role in transferring energy between the macroscales and microscales. In this thesis we investigate sea breezes (SBs) and mountain breezes(MBs). Apart from being ubiquitous, they play a fundamental role in the complex turbulent decay during the afternoon and evening transition (AET) of the atmospheric boundary layer (ABL). Intimately linked with the interaction between mesoscale flowsand ABL turbulence, relevant scalars such as CO2 can also be significantly affected by the onset of thermally-driven circulations. Mesoscale models such as Weather Research& Forecasting (WRF) have shown deficiencies in reproducing the turbulent decay during the AET and the influence of mesoscale flows on the CO2 budget...
Atmospheric motions are classified according to their spatial and time scales from largest to smallest into macroscales, mesoscales and microscales. Among mesoscale motions we find the thermally-driven flows, which are driven by horizontal thermal contrasts in scales between around 1 and 100–200 km, and occur in the form of closed circulations. They have a critical role in transferring energy between the macroscales and microscales. In this thesis we investigate sea breezes (SBs) and mountain breezes(MBs). Apart from being ubiquitous, they play a fundamental role in the complex turbulent decay during the afternoon and evening transition (AET) of the atmospheric boundary layer (ABL). Intimately linked with the interaction between mesoscale flowsand ABL turbulence, relevant scalars such as CO2 can also be significantly affected by the onset of thermally-driven circulations. Mesoscale models such as Weather Research& Forecasting (WRF) have shown deficiencies in reproducing the turbulent decay during the AET and the influence of mesoscale flows on the CO2 budget...
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Tesis de la Universidad Complutense de Madrid, Facultad de Ciencias Físicas, Departamento de Física de la Tierra y Astrofísica, leída el 11-01-2019