The picture shows a screenshot of the CCTV weather forecast on a certain day. In the four places shown in the figure, the temperature difference in inland areas is greater than that in coastal areas, causing this

Shanghai and Taipei are coastal areas with a lot of water, and the specific heat capacity of water is large; Xining and Lhasa are inland areas, and the surface is mainly sand and gravel soil, and the specific heat capacity of sand and gravel soil is small.

During the day, the same mass of water absorbs the same amount of heat as the land. The temperature of the water rises less, and the temperature of the sand and gravel soil rises more. Therefore, the rising temperatures of Shanghai and Taipei are lower, and the temperature of Xining is lower. The temperature rises higher than that of Lhasa; at night, the same amount of heat is emitted, the temperature of the water drops less, and the temperature of the sand and gravel soil drops more, so the temperature drop in Shanghai and Taipei is less, and the temperature drop in Xining and Lhasa is more, so the temperature inside The daily temperature difference between Xining and Lhasa in the inland area is larger than that in Shanghai and Taipei in the coastal area.

So the answer is: specific heat capacity.