Sensitivity of Precipitation Accumulation in Elevated Convective Systems to Small Changes in Low-Level Moisture

摘要: AbstractUsing a method for initiating quasi-stationary, heavy-rain-producing elevated mesoscale convective system in an idealized numerical modeling framework, series of experiments is conducted which shallow layer drier air introduced within the near-surface stable layer. The environment still very moist experiments, with changes to column-integrated water vapor only 0.3%–1%. timing and general evolution simulated systems are similar, but rainfall accumulation at surface changed by much larger fraction than reduction moisture, point precipitation maxima reduced up 29% domain-averaged accumulations 15%. differences partially attributed increases evaporation rate subcloud layer, though this found be secondary effect. More importantly, even has strong inhibition all simulations co...