The Growth of Sweden in Rosby

19 19- 1920 He entered the famous Bergen Meteorological School and joined the cyclone theory research and weather forecast team led by Pieckness. Young Rosby experienced the exciting discovery of polar front theory and air mass theory, and put forward some good ideas as a team member. In the summer of 19 19, he first proposed to use red and blue to represent warm front and cold front respectively on the weather map, instead of the opposite scheme used at that time. At this time, he also foresaw his interests and strengths in theory. The knowledge of physics and mathematics learned in college is not useless in the field of meteorology, but it is far from enough. 192 1 year, he went to the university of Leipzig in Germany for a year with piety. 192 1 year, he returned to Stockholm University and got a position in the Swedish Meteorological and Hydrological Bureau. There, he participated in the establishment of the high-altitude balloon observation network, and together with four other forecasters, he analyzed the weather map three times a day and made a national weather forecast. For two summers, he also went out with the ship to provide weather forecast. He participated in marine scientific expeditions in Jan Mayen (between Greenland and Iceland), the British Isles, Portugal and Madeira Islands. At the same time, he continued to study mathematics and physics at Stockholm University, and obtained his degree at 1925.