Is the isotherm of the Huai River in the Qinling Mountains of China not freezing in the south of the

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Summary. Specifically, whether the Huai River will freeze in winter depends on whether it is cold in winter every year, and some years have a freezing period that is usually shorter.

The rivers north of the Huai River in the Qinling Mountains freeze in winter, but not in the south, so does the Huai River itself freeze in winter?

Hello. This is an important dividing line in geography, which roughly coincides with the 0°C isotherm in January.

When the temperature drops below 0 degrees, it freezes.

When it is above freezing, there is no freezing.

Specifically, whether the Huai River will freeze in winter depends on whether it is cold in winter every year, and some years have a freezing period that is usually shorter.

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Not so strict, just relatively.

The creek to the south may still freeze.

This is the case in normal years, but there is no such strict distinction during the ice period, and this line is the distinguishing line between heating and non-heating in our country.

The differences between the north and south of the Qinling-Huaihe River line are mainly concentrated in the climate problem, and the other differences are basically caused by the difference in climate.

One. Temperature issues.

First of all, the Qinling-Huaihe line coincides with the January 0 isotherm in northern and southern China – just January.

The temperature difference between the north and the south is large in winter and not noticeable in summer. There are two main reasons for the large temperature difference between the north and the south in winter: first, the solar altitude angle in the north is smaller than that in the south, the days in the north are shorter than those in the south, the sunshine hours are less, and the solar heat is less; Second, the north is close to the source of the winter monsoon (Siberia), which is greatly affected by the winter monsoon, which aggravates the cold in the north and widens the temperature difference between the north and the south.

The small temperature difference between north and south in summer is due to the fact that although the solar altitude angle in the north is small, the daylight hours are long and the sunshine hours are long. The rainy season in the south is long, with many rainy days and short sunshine hours.

Two. Precipitation problems.

Due to the influence of the summer monsoon (southeast monsoon, southwest monsoon), the north and south of China are rainy in summer, but the rainy season in the south is long. While both the north and south suffer from cold and dry winter monsoons and suffer less rain in winter, the north is drier closer to the source of the winter winds.

In addition, because the north is drier than the south, the precipitation in the north is less than evaporation, and the precipitation in the south is greater than the evaporation, so the south is wetter than the north.

As for why the dividing line between the north and the south is the Qinling-Huaihe line, it is mainly because the Qinling Mountains and the Huaihe River are the main markers on the dividing line.