Will the winter solstice of 202 1 be very cold?
First, the winter solstice is the penultimate of the 24 solar terms, and the winter solstice is very cold, which conforms to the solar terms. Winter solstice is the twenty-second solar term, which belongs to the deep winter festival. On this day, the temperature in the northern hemisphere will be very low. Solstice solar term is one of the 24 solar terms summed up by working people after years of labor practice, and it is also the "compass" of temperature change. The solar terms of winter solstice tell us that the temperature on this day is usually very low in most parts of northern China, and it is very cold in winter solstice.
Second, the sun shines directly on the Tropic of Capricorn, which is the geographical reason why it is very cold in winter. On the solstice of winter, the sun shines directly on the latitude of 23.5 degrees in the southern hemisphere, and the days in the northern hemisphere are the shortest and the nights are the longest. According to the three ways of heat transfer, conduction, convection and radiation, when the infrared intensity in the sun is basically unchanged, the cumulative time for the northern hemisphere to receive sunlight from winter to day is the least. The total energy of infrared rays in the sun transmitted to the northern hemisphere through thermal radiation is less, and temperature is an important aspect of energy. The decrease of total energy is reflected in the change of temperature, and the solstice in winter will be very cold.
3. Affected by climate change, the winter solstice in 20021was colder than in previous years. During the winter solstice of 20021,all regions in the northern hemisphere were adversely affected by climate change-La Nina phenomenon. Because according to the monitoring data of seawater temperature in the Pacific Ocean, La Nina phenomenon was active in 20021year, and the seawater in the central and eastern Pacific Ocean became extremely cold. Heat can be transferred from a high temperature object to a low temperature object. When the sea water temperature is low, it will absorb all kinds of heat emitted by land cities, so the overall temperature of the earth is low. Under the influence of La Nina, the northern hemisphere will experience a cold winter. Therefore, the winter solstice of 202 1 is colder than in previous years.
Fourth, the winter solstice is the beginning of the cold period in the northern hemisphere. The solstice in winter is very cold, and then it will be even colder. The solstice of winter is the real beginning of winter. There are two solar terms, slight cold and severe cold, from winter to the future, and there will be a saying of "counting nine cold days" The winter solstice is not only very cold, but even colder after the winter solstice. Because the cold air activity in the northern hemisphere increases from winter to the future, and the solar radiation received by the northern hemisphere is the least in a year as a whole, the regional temperature remains the lowest level in a year from winter to the future.
It is concluded that the winter solstice of 202 1 will be very cold, which is not only the geographical reason for the lack of direct sunlight, but also influenced by the phenomenon of 202 1 La Nina. According to the solar terms of winter solstice, the temperature will be lower, and the winter solstice is also the beginning of the cold month in winter. Please pay attention to cold and warmth and travel safety according to the weather changes.