Xinhua News Agency, Beijing, August 3 (Reporter Huang Yao) Up to now, the average number of high temperature days nationwide this year is 8.7 days, 3.6 days more than the same period in normal years, the most in the same period in history since 1961.
This year's high temperature comprehensive intensity is the third strongest since 1961, second only to 2013 and 2017.
At the press conference held by the China Meteorological Administration on the 3rd, Xiao Chan, deputy director of the National Climate Center, introduced that in the past July, the national average temperature was 23.2°C, 1°C higher than the same period of the previous year, the second highest in the same period in history since 1961. The daily maximum temperature of 245 national weather stations across the country exceeded the historical extreme value in July.
In July, the national average number of high temperature days was 5.6 days, 2 days more than the same period in normal years, and the second most in the same period in history since 1961.
The number of high temperature days in eastern Southwest China, Central China, East China and most of South China, and southwestern Xinjiang was 5 to 10 days longer than the same period of the previous year, and more than 10 days in some areas.
Xiao Chan said that high temperature is a common high-impact weather in summer. Since the beginning of the 21st century, high temperature and heat waves in the northern hemisphere have become more frequent in summer.
Global warming is the climate background for frequent high temperature and heat wave events, and the abnormal atmospheric circulation is the direct cause. The strong high-pressure system has caused high temperature in many places to break through historical extremes.
After the beginning of summer, the subtropical high in the northern hemisphere is generally stronger and stronger than the same period of the previous year.
The western Pacific subtropical high pressure belt, the Atlantic high pressure belt and the Iranian high pressure all intensified in stages, forming a large-scale global warm high pressure belt over the northern hemisphere subtropical region.
Under the control of the warm high-pressure belt, the prevailing downdraft is conducive to the warming of the ground. In addition, under the action of the large-scale high-pressure belt, the air is relatively dry, and it is not easy to form clouds. It also makes it easier for solar radiation to reach the ground, resulting in frequent high temperature and strong intensity, and then Caused by persistent high temperature and heat wave events in many parts of the northern hemisphere.
In addition, the national average precipitation in July was 96.6 mm, 20.6% lower than the same period of the previous year, the second lowest in the same period in history since 1961, and the lowest in Tibet, Sichuan and Yunnan in the same period in history.
Affected by high temperature and low rainfall, moderate or above meteorological drought occurred in the eastern and southern parts of Southwest China, the eastern part of Northwest China, and parts of central and eastern China.
It is expected that in August, the temperature in most parts of the country will be close to the same period of the year to high.
Among them, most of East China, most of Central China, northeastern Southwest, most of Qinghai-Tibet Plateau and northern Xinjiang were 1°C to 2°C higher, and most of Northeast China and eastern Inner Mongolia were cooler.