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有关气温水平分布规律的第三点指出的“北半球,1月份大陆的等温线向南(低纬)凸出,海洋上则向北(高纬)凸出;7月份正好相反。”只要引导学生从海陆热力性质差异方面分析,就可以使学生掌握。至于“这表明在同一纬度上,冬季大陆比海洋冷,夏季大陆比海洋热”却是学生难以理解的。关键在于如何讲清“等温线向高纬凸出,比同纬度地区热;向低纬度凸出,比同纬度地区冷”这一概念。我讲清这一概念的步骤是:1.在北半球三条纬线上画出10℃等温线向高纬凸出的图形,取与40°N相交的一点为A(如图)。2.再在10℃等温线纬度高处画一相似图形的辅助等温线。
The third point pointed out in the law of the horizontal distribution of temperature is the northern hemisphere. In January, the isotherm of the mainland protrudes to the south (lower latitude) and the ocean rises to the north (high latitude). In July, the opposite is true. Guide students to analyze the differences in the nature of sea and land heating, students can grasp. As for “this shows that at the same latitude, the winter continent is colder than the ocean, and the summer continent is hotter than the ocean” but it is difficult for students to understand. The key lies in how to clarify the concept that the “isotherm protrudes to high latitudes, which is hotter than the same latitudes; it projects to lower latitudes and is colder than the same latitudes.” The steps I made to clarify this concept are: 1. Draw the 10°C isotherm projected to the high latitude on the three parallel lines in the northern hemisphere. Take the point that intersects 40°N as A (pictured). 2. Then draw an auxiliary isotherm of a similar pattern at the latitude of the 10°C isotherm.