Cross validation of in situ, airborne and remote
sensing data from East Antarctica
A. Pfaffling 1 , T. Worby 2 &
R. Massom 2
(1) formerly AWI, now Consultant, Germany.
(2) Australian Antarctic Division & ACE CRC, Australia.
Sea Ice data X-Validation
• Database & Sensors
• in-situ validation
• Remote sensing
03.08.2006 Pfaffling et.al. Sea Ice X-Validation 3
ARISE 03 Expedition
Cruise track
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Ice station layout
Flight map ARISE
110°
110°
112°
112°
114°
114°
116°
116°
118°
118°
-66°30' -66° 0' -65°30' -65° 0' -64°30'
030929 NNW/2 031002_1 NNE/3 031002_2 SSE/7 031003_1
021003_2 NE/4 031008 SE/8 031018
031019 031020_1 031020_2
03.08.2006 Pfaffling et.al. Sea Ice X-Validation 7
Sea Ice data X-Validation
• Database & Sensors
• in-situ validation
• Remote sensing
Gadgets
• AWI HEM sensor total thickness
• Aerial photogr.
• IR thermometer
classification
03.08.2006 Pfaffling et.al. Sea Ice X-Validation 9
Sea Ice data X-Validation
• Database & Sensors
• In-situ validation
• Remote sensing
Expedtition “ARISE”
Sep/Oct 2003
RSV “Aurora Australis”
Ice Station 4 3 days
999 drillings
20 m 500 m
B A
C
03.08.2006 Pfaffling et.al. Sea Ice X-Validation 11
6.0 5.0 4.0 3.0 2.0 1.0 0.0
total thickness [m]
500 400
300 200
100 0
profile [m]
drillings
Drilled total thickness
6.0 5.0 4.0 3.0 2.0 1.0 0.0
total thickness [m]
500 400
300 200
100 0
profile [m]
drillings
200 150 100 50 0
Depth [m]
10 100
Bulk conductivity [mS/m]
50 0
Depth [m]
10 100
Bulk conductivity [mS/m]
Drilled total thickness
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4 3 2 1 0
Ice thickness [m]
500 400
300 200
100 0
Profile [m]
Drilled thickness 3.68 kHz IP 3.68 kHz Q
Heli-EM thickness
0.16
0.12
0.08
0.04
0.00
1.2 1.0
0.8 0.6
0.4 0.2
0.0 0.0 0.2 0.4 0.6 0.8 1.0 1.2
0.4 0.3 0.2 0.1 0.0
3.0 2.5
2.0 1.5
1.0 0.5
0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0
unfilterd TTem smooth f1 IP smooth f1 Q drillings Probability vs. ice thickness
03.08.2006 Pfaffling et.al. Sea Ice X-Validation 15
HEM precision & accuracy
25 m
doughnut foot-
print 10…50 cm
Point-by- Point
thickness
≥ 500 m
“swath”
profile subset 1…5 cm
Level ice
thickness
Sea Ice data X-Validation
• Database & Sensors
• in-situ validation
• Remote sensing
03.08.2006 Pfaffling et.al. Sea Ice X-Validation 17
MODIS
scene plus EM track
145 km
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MODIS +
HEM +
aerial photos
155 km
03.08.2006 Pfaffling et.al. Sea Ice X-Validation 21
03.08.2006 Pfaffling et.al. Sea Ice X-Validation 23
