260
J. Kjellsson et al.
Fig. 8.3 (a) SVP drifter trajectories coloured by their total Lagrangian velocities. The colour range
is from 0 to 0.4 m/s. (b) SVP drifter trajectories coloured by the Lagrangian integral time scales.
Calculations of Lagrangian time scales yielded one value per drifter segment (256 hours). Colours
range from 0 to 2 days
Fig. 8.4 The sea surface
temperature measured by
each SVP drifter. Horizontal
time axis is days from the first
deployment, 14 July 2010, up
to December 2011 when the
data collection was stopped.
The SSTs were constantly
above 0 °C, suggesting
ice-free conditions
8.5.2 Model Evaluation
The years 2010–2011 were not available in our RCO data set and thus a direct comparison of measured and modelled statistical features of drift was not possible. Also,
the first and last years (1961 and 2005) in the RCO data set were incomplete and
could therefore not be used. Statistics extracted from the SVP drifter segments was
therefore compared to statistics derived from the motion of simulated drifters in
1962–2004. This comparison is not exactly straightforward because the SVP drifter
data in 2010–2011 were collected under ice-free conditions but large parts of the
J. Kjellsson et al.
Fig. 8.3 (a) SVP drifter trajectories coloured by their total Lagrangian velocities. The colour range
is from 0 to 0.4 m/s. (b) SVP drifter trajectories coloured by the Lagrangian integral time scales.
Calculations of Lagrangian time scales yielded one value per drifter segment (256 hours). Colours
range from 0 to 2 days
Fig. 8.4 The sea surface
temperature measured by
each SVP drifter. Horizontal
time axis is days from the first
deployment, 14 July 2010, up
to December 2011 when the
data collection was stopped.
The SSTs were constantly
above 0 °C, suggesting
ice-free conditions
8.5.2 Model Evaluation
The years 2010–2011 were not available in our RCO data set and thus a direct comparison of measured and modelled statistical features of drift was not possible. Also,
the first and last years (1961 and 2005) in the RCO data set were incomplete and
could therefore not be used. Statistics extracted from the SVP drifter segments was
therefore compared to statistics derived from the motion of simulated drifters in
1962–2004. This comparison is not exactly straightforward because the SVP drifter
data in 2010–2011 were collected under ice-free conditions but large parts of the