TY - RPRT AU - M. Tiedtke CY - Shinfield Park, Reading DA - 06/1977 LA - eng M1 - 10 M3 - Internal Report PB - ECMWF PP - Shinfield Park, Reading PY - 1977 EP - 21 TI - Numerical tests of parameterization schemes at an actual case of transformation of Arctic air ER -