TY - CPAPER AU - C. Snyder BT - Seminar on Data assimilation for atmosphere and ocean, 6-9 September 2011 CY - Shinfield Park, Reading DA - 2012 LA - eng PB - ECMWF PP - Shinfield Park, Reading PY - 2012 SP - 161 EP - 170 T2 - Seminar on Data assimilation for atmosphere and ocean, 6-9 September 2011 TI - Particle filters, the optimal proposal and high-dimensional systems ER -