edu.ucar.opensky::articles:25999 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T19:57:29.261286 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7tx3k8n Dependencies of four mechanisms of secondary ice production on cloud-top temperature in a continental convective storm 2022-12-01T00:00:00Z publication https://n2t.org/ark:/85065/d7tx3k8n https://doi.org/10.1175/JAS-D-21-0278.1 Waman, D. author Patade, S. author Jadav, A. author Deshmukh, A. author Gupta, A. K. author Phillips, V. T. J. author Bansemer, Aaron R. author DeMott, P. J. author UCAR/NCAR - Library publisher Various mechanisms of secondary ice production (SIP) cause multiplication of numbers of ice particle, after the onset of primary ice. A measure of SIP is the ice enhancement ratio ("IE ratio") defined here as the ratio between number concentrations of total ice (excluding homogeneously nucleated ice) and active ice-nucleating particles (INPs). A convective line observed on 11 May 2011 over the Southern Great Plains in the Mesoscale Continental Convective Cloud Experiment (MC3E) campaign was simulated with the "Aerosol-Cloud" (AC) model. AC is validated against coincident MC3E observations by aircraft, ground-based instruments, and satellite. Four SIP mechanisms are represented in AC: the Hallett-Mossop (HM) process of rime splintering, and fragmentation during ice-ice collisions, raindrop freezing, and sublimation. The vertical profile of the IE ratio, averaged over the entire simulation, is almost uniform (10(2) to 10(3)) because fragmentation in ice-ice collisions dominates at long time scales, driving the ice concentration toward a theoretical maximum. The IE ratio increases with both the updraft (HM process, fragmentation during raindrop freezing, and ice-ice collisions) and downdraft speed (fragmentation during ice-ice collisions and sublimation). As reported historically in aircraft sampling, IE ratios were predicted to peak near 10(3) for cloud-top temperatures close to the -12 degrees C level, mostly due to the HM process in typically young clouds with their age less than 15 min. At higher altitudes with temperatures of -20 degrees to -30 degrees C, the predicted IE ratios were smaller, ranging from 10 to 10(2), and mainly resulted from fragmentation in ice-ice collisions. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2022 American Meteorological Society (AMS). None eng geoscientificInformation