We are grateful to Martin Leutbecher for useful comments. Heini Wernli provided the Lagrangian analysis tool (Wernli and Davis 1997) and help in its implementation. Hans Hersbach kindly provided QuikSCAT data. PBR is grateful for support from the Arctic Research Office of NOAA, the Office of Polar Programs of National Science Foundation, and to the Department of Meteorology, University of Reading, where a pleasant and musical sabbatical-year collaboration began. We thank Pinngortitaleriffik, the Greenland Institute for Natural Resources, Nuuk, for support during our Seaglider launching mission to Greenland.
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