Geography in the second day of junior high school, when our teacher talked about the monsoon climate in China, he said that the summer monsoon came early and left late, which would cause "northern wat

Geography in the second day of junior high school, when our teacher talked about the monsoon climate in China, he said that the summer monsoon came early and left late, which would cause "northern waterlogging and southern drought"; Be late and leave early. Your question involves a little knowledge of high school geography. The summer monsoon refers to the southeast monsoon, that is, the warm and humid airflow in the northern part of the western Pacific. The summer monsoon comes early and leaves late, which is powerful. It means that the warm and humid air flow in the southeast moves strongly to the northwest inland along the southeast coast of China, and meets with the high-pressure cold air mass in the Mongolian Plateau in the south of China to form long-term rainfall. At this time, due to the strong warm and humid airflow in the south of China, the cold air is blocked from going south, and the southern region is controlled by low pressure, so precipitation cannot be formed. On the other hand, if you come late and leave early, your strength will be weak, and the warm and humid airflow will not go deep inland, so you can only meet the cold air mass from the south in the southeast of China and form continuous rainfall. The north is controlled by a single high-pressure cold air mass, with sunny, windy and low temperature. Without warm and humid airflow, rainfall cannot be formed. There can be no rain in any area controlled by cold and warm air masses. In junior high school, we only need to recite this phenomenon without further analysis, but the students in senior two are understandable. What I don't know is why these regional cold and warm air masses are formed. Will answer in high school. Learn geography well in junior high school, or listen to the gobbledygook and the teacher will give lectures, and you can only open your eyes and don't know what to say.