Reflectivity (dBZ) from the MilliMeter Wave Radar (MMCR), fall velocity (ms -1 ) of the slowest falling particles determined from the Doppler velocity power spectra, and the linear depolarization (log(Percentage Depolarization)) from the Arctic High Spectral Resolution Lidar (AHRSL) over Barrow, Alaska on 6 October 2004. 

Contexts in source publication

Context 1

... precipitation, it is the fall velocity of the slowest precipitation particles added to an unknown air vertical velocity. Figure 3 presents the reflectivity, velocity of the slowest hydrometeor, and lidar linear depolarization for the selected three minute period. Comparing to the same period in Fig. 2c, one see that the slanted multi-mode structure is associated with the slanting higher reflectivity feature, a precipitation shower, whereas the linear multi-mode structure has no perceptible reflectivity structure associated with it. ...

Context 2

... at the velocity field (Fig. 3b) more features can be distinguished. Updrafts, here identified as negative velocities, are visible in the small reflectivity structure at cloud top. This 500 m deep cloud has a tilted updraft structure, with the precipitation falling on the down shear (~12.2 min) side of the cloud. The jump in velocity along the horizontal line between ...

Context 3

... m are evidence of turbulence. This can be seen as shifts in the spectra for successive times, particularly in the positive (downward) extensions of the waves. The profiles of spectra and the atmospheric thermodynamic sounding suggest that the cloud is not a single continuous layer, but rather several, thin layers. Evidence of this can be seen in Fig. 3b, where in the gravity wave downward displacement (12.4 -13.2 min) pixels with higher downward velocities are evident. When such layers are vertically displaced, the atmosphere may develop absolute instabilities because of differences in the dry and moist adiabatic lapse rates, giving rise to convective overturning in those ...