TY - GEN AU - Simmons, A. AU - Jiabin, Chen TI - The calculation of geopotential and the pressure gradient in the ECMWF atmospheric model: inflence on the simulation of the polar atmosphere and on temperature analysis T2 - Technical report VL - 66 PY - 1990/// CY - Reading PB - ECMWF KW - ECWMF KW - INMG KW - MODELOS DE PREVISÃO KW - 551.5 KW - med KW - fre ER -