Open AccessEffects of ice number concentration on dynamics of a shallow mixed‐phase stratiform cloud
Author(s) -
Ovchinnikov Mikhail,
Korolev Alexei,
Fan Jiwen
Publication year - 2011
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2011jd015888
Subject(s) - sea ice growth processes , buoyancy , atmospheric sciences , liquid water path , environmental science , cloud base , radiative transfer , ice cloud , sea ice , radiative cooling , liquid water content , mechanics , arctic ice pack , geology , meteorology , sea ice thickness , physics , cloud computing , optics , computer science , operating system
Previous modeling studies have shown high sensitivity of mixed‐phase clouds to ice number concentration, Ni, with simulated clouds often transitioning from mixed‐phase to ice‐only regime within a narrow range of Ni. To better understand the mechanisms behind this transition, we analyze several simulations of a mixed‐phase stratiform Arctic cloud observed on 26 April 2008 during the Indirect and Semi‐Direct Aerosol Campaign (ISDAC). In the BASE run, Ni is constrained to match the measured value and a persistent mixed‐phase cloud is formed, with properties similar to those observed. When Ni is quadrupled (HI_ICE) the liquid water path is reduced by half within two hours. The changes in liquid water are accompanied by diminishing radiative cooling and slowing vertical mixing, exposing complex interactions among microphysics, radiation and dynamics. Deviations of BASE and HI_ICE from a simulation without ice are used to explore the linearity of the model response to variation in Ni. It is shown that early changes in cloud condensate amount and radiative cooling rate are proportional to Ni, while changes in the vertical buoyancy flux and dynamics are qualitatively different in HI_ICE compared to BASE. The nonlinear (with respect to Ni) reduction in buoyancy flux drives the initial response of the mixed layer dynamics to the appearance of ice and subsequently determines the sustainability of liquid water in the cloud in this case. Two additional sensitivity experiments link the decreased buoyancy production to the latent heat release from the depositional ice growth while confirming the importance of the cloud‐radiation feedback.