TY - SLIDE KW - annual seminar KW - Jülich Forschungszentrum AU - P. Preusse BT - ECMWF Annual Seminar 2015 C1 - Events DA - 2015 LA - eng PY - 2015 T2 - ECMWF Annual Seminar 2015 T3 - ECMWF Annual Seminar TI - Gravity waves: introduction and global view ER -