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contributor authorPhillips, Vaughan T. J.;Yano, Jun-Ichi;Formenton, Marco;Ilotoviz, Eyal;Kanawade, Vijay;Kudzotsa, Innocent;Sun, Jiming;Bansemer, Aaron;Detwiler, Andrew G.;Khain, Alexander;Tessendorf, Sarah A.
date accessioned2018-01-03T11:02:30Z
date available2018-01-03T11:02:30Z
date copyright6/15/2017 12:00:00 AM
date issued2017
identifier otherjas-d-16-0223.1.pdf
identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4246451
description abstractAbstractIn Part I of this two-part paper, a formulation was developed to treat fragmentation in ice?ice collisions. In the present Part II, the formulation is implemented in two microphysically advanced cloud models simulating a convective line observed over the U.S. high plains. One model is 2D with a spectral bin microphysics scheme. The other has a hybrid bin?two-moment bulk microphysics scheme in 3D. The case consists of cumulonimbus cells with cold cloud bases (near 0°C) in a dry troposphere.Only with breakup included in the simulation are aircraft observations of particles with maximum dimensions >0.2 mm in the storm adequately predicted by both models. In fact, breakup in ice?ice collisions is by far the most prolific process of ice initiation in the simulated clouds (95%?98% of all nonhomogeneous ice), apart from homogeneous freezing of droplets. Inclusion of breakup in the cloud-resolving model (CRM) simulations increased, by between about one and two orders of magnitude, the average concentration of ice between about 0° and ?30°C. Most of the breakup is due to collisions of snow with graupel/hail. It is broadly consistent with the theoretical result in Part I about an explosive tendency for ice multiplication.Breakup in collisions of snow (crystals >~1 mm and aggregates) with denser graupel/hail was the main pathway for collisional breakup and initiated about 60%?90% of all ice particles not from homogeneous freezing, in the simulations by both models. Breakup is predicted to reduce accumulated surface precipitation in the simulated storm by about 20%?40%.
publisherAmerican Meteorological Society
titleIce Multiplication by Breakup in Ice–Ice Collisions. Part II: Numerical Simulations
typeJournal Paper
journal volume74
journal issue9
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/JAS-D-16-0223.1
journal fristpage2789
journal lastpage2811
treeJournal of the Atmospheric Sciences:;2017:;Volume( 074 ):;issue: 009
contenttypeFulltext


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