What is temperature change?

Observational records and research results show that the average temperature of the global land and ocean surfaces has been on an upward trend since 1861, with an increase of about 0.6°C in the 20th century.

Globally, the 1990s were the warmest decade since 1861, and 1998 was the warmest year since 1861. The global temperature instrumental measurement records of the past 100 years also show obvious interdecadal changes. The most important warming in the 20th century occurred between 1910 and 1945 and between 1976 and 2000. Combining a large amount of proxy data, research on climate change in the Northern Hemisphere in the past 1,000 years shows that the warming in the 20th century may have been the largest in the past 1,000 years. The 1990s may have been the warmest decade in the past 1,000 years, and 1998 was the warmest decade in the past 1,000 years. The warmest year in nearly 1,000 years. Observational data show that from 1951 to 1989, the national annual average temperature increased at a rate of 0.04°C per decade, showing an obvious upward trend; since 1987, there has been an abnormally warm trend that lasted for 14 years, with the warmest year being 1998. 1.4℃. This warming trend is consistent with global warming. However, China's climate also shows obvious interdecadal characteristics, with a weak downward trend in the 1960s, a slow warming trend from the 1970s to the early 1980s, and a significant warming trend in the late 1980s. In terms of regions, the temperature increase is most significant in the western part of Northeast China, North China and Northwest China, and the temperature increase is more obvious in winter than in other seasons, and the temperature increase is more obvious at night than during the day.