CIFEX Experiment #10
April 13, 2004.
Flight Scientist: Greg Roberts
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Flight # 14
Objective: Multiple cloud layers and profile developed cloud system.
Flight characterized by ice clouds. Flight track northwest then north.
Times are local time (GMT = Local Time + 7)
Take-off: 10:08
Land: 13:39
Trinidad Head fly-over - 10:12 @ 1300ft
o CN - 500
o PCASP - 166
o CCN - 100
o SMPS - broad spectrum with median diameter at ca. 150 nm
Climb to ca. 8500ft through multilple layers of clouds with lowest cloud
base at ca. 5000ft. Observed some drizzle.
Descended below clouds to < 4700ft - clean aerosol conditions
o CN - 200
o PCASP - 99
o SMPS - median diameter: 150 nm
10:53 - scattered low cumulus clouds with higher uniform stratus layer.
Clouds above 3600ft have ice particles.
11:24 - turn around and climb to 12000 ft
11:28 - High CN layers and particle number concentrated to less than 30nm
11:39 - enter cloud system at 12000ft - cloud top ca. 14500ft
11:53 - Begin vertical profile down at 500 ft/min - in & out of cloud
12:15 - at 3000ft below cloud base
o CN - 190
o pcasp - 50
12:17 - rise to 7k on return leg
12:35 - Another vertical sounding in mixed layer to 1000ft. Melting layer
observed again at 3600ft.
12:52 - lower cumulus cloud base at 1500ft
12:56 - Aerosol below cloud were clean at:
o CN 194
o PCASP 30
o SMPS: few particles > 60 nm indicating processed aerosol
13:34 - Trinidad Head fly-over
CN - 300 /cc
SMPS distribution indicates processed aerosol