TY - RPRT AU - Adrian Simmons AU - J. Chen CY - Shinfield Park, Reading DA - 07/1990 LA - eng M1 - 66 M3 - Technical Report PB - ECMWF PP - Shinfield Park, Reading PY - 1990 EP - 79 TI - The calculation of geopotential and the pressure gradient in the ECMWF atmospheric model: Influence on the simulation of the polar atmosphere and on temperature analyses. ER -