1. Department of Atmospheric Sciences, RSMAS, University of Miami, Miami, Florida 33149, USA
2. Department of Ocean Sciences, RSMAS, University of Miami, Miami, Florida 33149, USA
3. Institute for Mechanical Systems, ETH Zurich, Zurich, Switzerland
4. Department of Mathematics, ETH Zurich, Zurich, Switzerland
5. Physical Oceanography Division, AOML, NOAA, Miami, Florida 33149, USA