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PIKNMIX-D
Cirrus fallstreak
Steven Abel and Richard Cotton
© Crown copyright Met Office
Obtaining ice particle model parameters with
in-situ aircraft observations
•Often requires unique flight path.
•Lagrangian descent following an
evolving population of ice particles
falling through the depth of cirrus.
•Measure just nucleated small ice
crystals near top, to large snow
aggregates near base.
•Extract directly from observations,
model parameters that define the
ice particle fall-speed as a function
of size.
© Crown copyright Met Office

race-track where the straights are orientated across the mean horizontal wind.
o straight and level run [3 min]
o -other side - profile descent [3 min] arriving at level 1000ft below (eg. 500ft/min for 2
min, then 1 min level).
o Turns are 20° [2 min]. [10 min per level]
© Crown copyright Met Office
Instrumentation
Key Instruments
Temperature, Total Water, AIMMS-20, Turbulence probe, Cloud physics (all),
WVSS-II, General Eastern/Buck, Nevzorov.
Extremely useful
LIDAR.
D
© Crown copyright Met Office
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