The Climate Change Center of the Bureau of Meteorology released the Blue Book on China Climate Change (2019). The report pointed out that the comprehensive observation of the climate system and a number of key indicators indicate that the warming trend of the climate system is further sustained. China's extreme weather and climate events tend to be stronger and the climate risk level is on the rise.
According to the latest release of the World Meteorological Organization, the global average temperature in 2018 is 0.38 °C higher than the 1981-2010 average. The past five years (2014-2018) are the warmest five years since the complete meteorological observations.
From 1961 to 2018, China's average annual precipitation showed a slight increase trend, and the characteristics of interdecadal changes were obvious. From the 1980s to the 1990s, China's average annual precipitation was mainly dominated, and the overall decade of the first century was less. Precipitation has continued to increase since 2012. The regional variation of precipitation trends is obvious. The precipitation in Qinghai-Tibet area shows a significant increase trend, while the precipitation in the southwestern region has a weak decreasing trend. Since the beginning of this century, the average annual precipitation in North China, South China and Northwest China has fluctuated, while the precipitation in Northeast China and East China has increased. The annual fluctuations of the volume increase.
From 1961 to 2018, China's average wind speed and sunshine hours showed a downward trend. In 2018, China's average relative humidity and total cloud amount were higher than normal, and the average wind speed was smaller than normal.
From 1961 to 2018, the number of dust days in the northern region showed a significant decrease. From 1992 to 2018, the acid rain in China generally weakened and decreased. In 2018, the national average precipitation pH was 5.90. The national average acid rain and strong acid rain frequency were the lowest since 1992.
In 2018, the national average vegetation index is close to the average of 2011-2017, and the winter, spring and summer vegetation indices are slightly higher than the average for the same period since 2011. From 1963 to 2018, the spring phenological period of representative plants in different regions of China showed a significant early trend, and the phenological period of autumn phenophase fluctuated greatly. In 2018, the beginning of the deciduous period of weeping willow in Hefei Station was the latest since the observation record.