Updates on the NASA Team 2 sea ice concentration and snow depth algorithms
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Updates on the NASA Team 2 sea ice concentration and snow depth algorithms
Thorsten Marks, Don Cavalieri, Al Ivanoff, Ludovic BruckerNASA Goddard Space Flight Center
1 of 67
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The NASA Team 2 approach finds the best solution from a set of pre-calculated sea ice concentration – atmosphere conditions
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Sea ice concentration Uncertainty Error because of averaging
= 0 %= 1 - 2 %
>= 3 %
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Orbits per day
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Monthly distributions of uncertainty versus sea ice concentration
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Atmosphere index over uncertainty
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Snow depth on sea ice
With Operation IceBridge we, for the first time, have extensive validation data
The IceBridge plane has an FMCW radar that directly measures the snow depth on sea ice
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200 AMSR-E pixels that have OIB data
Arctic 2009
MY ice
ocean
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2009
2010
2011
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2009
2010
2011
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Mean (X) Min (X) Max (X) Mean (|X|) N
20090402 3.2 -4 10 4.3 1020090405 -1 -9 35 3.1 12820090425 10.7 -11 28 11.4 60
OIB Flight date
X =SDOIB - SDL3
Mean (X) Min (X) Max (X) Mean (|X|) N
20100323 020100326 5 -14.6 61.4 7.6 4920100402 -0.8 -9.7 27.5 3.6 16120100405 -2.5 -14.7 11.2 7.9 1020100412 -6.3 -21.3 20.7 13.8 1420100419 -1.6 -8.1 3.9 2.6 5820100420 2.2 -5.9 8.1 3.9 1920100421 -3.6 -13.7 5 4 30
OIB Flight date
Mean (X) Min (X) Max (X) Mean (|X|) N
20110316 020110317 020110318 020110322 -4.4 -4.4 -4.4 4.4 120110323 -4.2 -10.8 8 5.3 3020110325 020110326 020110328 -1.5 -15.7 10 5.3 2120110415 0
OIB Flight date
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Class Low limit High limit Min (X) Max (X) Mean(X) Mean (|X|) NSD -0.16 0.05 -0.05 0.05 49
> 0.09 -0.21 0.17 0.00 0.04 491> 0.21 -0.18 0.61 0.10 0.14 51
SD var. -0.16 0.02 -0.05 0.06 48> 0.05 -0.21 0.35 0.00 0.04 477> 0.14 -0.16 0.61 0.07 0.10 66
Surf. Roughness -0.15 0.61 0.05 0.08 65> 0.10 -0.21 0.35 0.01 0.05 347> 0.20 -0.18 0.13 -0.02 0.04 58
Ice thickness -0.04 0.28 0.09 0.10 52> 0.45 -0.21 0.61 0.01 0.05 234> 2.7 -0.13 0.13 0.00 0.04 46
AMSR-E SD -0.03 0.35 0.09 0.09 125> 0.10 -0.15 0.61 -0.01 0.04 402> 0.20 -0.21 0.13 -0.06 0.07 64
AMSR-E SIC 0.05 0.29 0.14 0.14 41> 90% -0.21 0.61 -0.01 0.04 550
0.09
0.21
0.05 0.14
0.10 0.20
0.45 2.7
0.10 0.20
90%
Classes per geophysical properties
X =SDOIB - SDL3
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ICEX 2011-03-23
16 16
16 16
17
18
18
20
AMSR-E (SD)12.5-km pixel
17
18
20
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Repetability of the SD retrievals& Spatial variations (East passes)
0.18 m
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1 K →5 cm
SD vs. SD w/ a 1 K TB noise
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Difference between IceBridge and AMSR-E snow depth (2009-2011)