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(a)
Biased FYI
Biased MYI
Lead
MYI
FYI
(b)
MYI
FYI
Fig. 4 a Geolocated CryoSat-2 surface elevations after retracking with a 40 % threshold and
subtraction of the mean sea-surface height which has been interpolated along the CryoSat-2
ground track. Highlighted points belong to the waveforms in Fig. 2 . b Right- and left-peakiness
along the CryoSat-2 ground track. The dashed vertical line marks the boundary between rst- and
multi-year ice
Table 2 Values of left-peakiness (PPl) l ) and right-peakiness (PPl) l ) for the different surface types
that are shown in Fig. 2
Waveform parameter
Mean FYI
Mean MYI
Lead
Biased FYI
Biased MYI
PP l
32.0
9.0
87.2
21.5
38.7
PP r
10.1
5.6
109.0
15.1
5.2
ections
from leads that can either bias the interpolation of the sea-surface, if classi
This
finding has direct consequences for the classi
cation of off-nadir re
fl
ed as
leads, or affect the surface elevations of the sea ice, if classi
ed as sea ice. In the
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