On August 4, China Meteorological Administration (CMA) rolled out Blue Book on Climate Change in China 2021 (hereafter referred to as the Blue Book), which shows that climate system warming is continuing and risks of extreme weather and climate events are aggravating.
CMA also published the latest monitoring information on climate change in China, Asia, and the whole world from the perspective of atmosphere, hydrosphere, cryosphere, biosphere, and climate change drivers.
As the Blue Book showcases, global average temperature in 2020 is 1.2 ℃ higher than that in pre-industrial levels (the average figure between 1850 and 1900). It is one of the three warmest years since the comprehensive observation record. From 1951 to 2020, average temperature rise rate on the surface in China registers 0.26℃/10yr, which is evidently higher than the global average level in the same period (0.15℃/10yr).
From 1961 to 2020, average annual precipitation in China is on increase trend; the average annual day of precipitation is on decrease trend; extreme heavy rain events in China are on the uptake; extreme low temperature events are on the decrease; extreme high temperature events are remarkably heavier since the mi-1990s; the average intensity fluctuation of typhoons which have made landfall in China since the post-1990s is enhanced; the average day of sand and dust in northern China is dwindling in recent years. Climate risk index (CRI) is on the increase, and CRI in 2020 was the third highest since 1961.
When ocean warming accelerates, global average sea surface is rising at a faster rate. In 2020, global average sea surface temperature ranked fourth among the highest temperature since 1870. The global average sea surface is the highest since satellite observation record. Coastal sea surface in China was the third highest since 1980. In terms of water resources on the surface, since 2015, water resource on the surface has turned to be more plentiful.
Furthermore, from 1996 to 2020, mountains and glaciers in the world are retreating. From 1979 to 2020 sea ice extent in the North Pole is on markedly diminishing trend.
In recent years, China's vegetation coverage is increasing at a steady speed and continuing to turn green. In 2020, NDVI in China was 7.6% higher than the average from 2000 to 2019, ranking first since 2000. (Aug.12)
Editor: Liu Shuqiao