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Mid-tropospheric supercooled liquid water observation consistent with nucleation induced by a mountain lee wave

TitoloMid-tropospheric supercooled liquid water observation consistent with nucleation induced by a mountain lee wave
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2009
AutoriMadonna, F., Russo Felicita, Ware R., and Pappalardo G.
RivistaGeophysical Research Letters
Parole chiaveArtificial Neural Network, Atmospheric humidity, atmospheric moisture, Atmospherics, Boulder, Colorado, Cryogenic liquids, Ground level, Landforms, lee wave, Lee waves, Liquid water, Liquid water paths, Microwave devices, microwave radiometer, Microwave radiometer profilers, Microwave retrieval, Microwaves, Moisture, Neural network algorithm, Neural networks, North America, Nucleation, radiometry, Relative humidities, relative humidity, Sky condition, Supercooled droplets, Supercooled liquid water, Supercooling, Temperature and relative humidity, troposphere, twilight, Twilight zone, United States, USA, Vertical profile, Water analysis, Wave activity

A case study relative to the observation of unexpected liquid water in an apparently cloudless atmosphere is presented. Microwave radiometer profiler observations on 14 April 2008 at Boulder, Colorado, USA, showed an increase in the liquid water path with values higher than 0.05 mm and corresponding relative humidity saturation from 4.75 to 6.75 km above the ground level in profiles retrieved using a neural network algorithm. The formation of small supercooled droplets identified in the microwave retrieval of the temperature and relative humidity vertical profiles may result from nucleation stimulated by a mountain lee wave. The presented analysis reveals the existence of supercooled liquid water in the mid troposphere related to a wave activity that occurred in a sky condition classifiable as "clear" and describes an atmospheric scenario consistent with the observation of the so-called twilight zone. Copyright 2009 by the American Geophysical Union.


cited By 4

Citation KeyMadonna2009