Which solar term is not the period with the largest temperature difference between day and night in the northern hemisphere? A. winter solstice B. light snow C. heavy snow D. Millennium

The Millennium solar terms are not the period with the largest temperature difference between day and night in the northern hemisphere.

First of all, let's analyze which solar term is not the period with the largest temperature difference between day and night in the northern hemisphere. The temperature difference between day and night mainly depends on the intensity of solar radiation during the day and the intensity of ground radiation at night. In winter, the amount of solar radiation received by the northern hemisphere decreases, there are few clouds at night, the atmospheric inverse radiation is weak, and the temperature difference between day and night is large.

Next, let's examine the solar terms in the options one by one: winter solstice: winter solstice is winter in the northern hemisphere. At this time, the sun shines directly in the southern hemisphere, and the northern hemisphere receives the least amount of solar radiation, so the temperature difference between day and night is very large. Light snow: Light snow solar terms are usually in winter, when the amount of solar radiation in the northern hemisphere decreases and there are fewer clouds at night, so the temperature difference between day and night is large.

Heavy snow: The solar term of heavy snow is also the solar term of winter. At this time, the solar radiation in the northern hemisphere is the smallest, and there are few clouds at night, so the temperature difference between day and night is also large. Bailu: Bailu is the solar term in autumn. At this time, the direct point of the sun is in the southern hemisphere, but it has not yet reached the winter solstice. The northern hemisphere still receives more solar radiation, with more clouds at night and strong atmospheric inverse radiation, so the temperature difference between day and night is relatively small. So, the answer is the Millennium.

Meteorological change

After entering the Millennium solar terms, the summer monsoon is gradually replaced by the winter monsoon, and the cold air gradually moves southward frequently. In addition, the position where the sun directly touches the ground moves south, and the sunshine time in the northern hemisphere becomes shorter and the sunshine intensity weakens. At night, it is often partly cloudy and sunny, and the ground radiation dissipates quickly, so the temperature drop is gradually accelerated. There is a saying called "Qiu Qiu in a thousand years, it is cold all night."

After the Millennium, the temperature difference between day and night gradually widened. Although the temperature is high at noon during the day, it is already very cold in the morning and at night. According to the standard of "average weather temperature" proposed by modern scholar Zhang Baokun, the average weather temperature is 10-22℃ in spring or autumn. According to this standard, from the beginning of the Millennium solar term, all localities began to enter autumn one after another. At this time, the temperature difference between day and night in China can reach 8℃- 16℃, so the Millennium is a solar term with a large temperature difference in a year.