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Torri, Giuseppe; Kuang, Zhiming; Tian, Yang
Geophysical research letters, 28 March 2015, Letnik: 42, Številka: 6Journal Article
Cold pools are fundamental ingredients of deep convection. They contribute to organizing the subcloud layer and are considered key elements in triggering convective cells. It was long known that this could happen mechanically, through lifting by the cold pools' fronts. More recently, it has been suggested that convection could also be triggered thermodynamically, by accumulation of moisture around the edges of cold pools. A method based on Lagrangian tracking is here proposed to disentangle the signatures of both forcings and quantify their importance in a given environment. Results from a simulation of radiative‐convective equilibrium over the ocean show that parcels reach their level of free convection through a combination of both forcings, each being dominant at different stages of the ascent. Mechanical forcing is an important player in lifting parcels from the surface, whereas thermodynamic forcing reduces the inhibition encountered by parcels before they reach their level of free convection. Key Points Thermodynamic effect of cold pools crucial in the inhibition layer Gust front lifting is necessary for lifting parcels from the surface No forcing mechanism by cold pools is entirely dominant; cooperation is needed
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