What is the abnormal weather in 2023?

It is mainly caused by La Nina event and tropical SST anomaly.

According to the forecast of China Climate Center, the second wave of "Double La Nina Phenomenon" in China is expected to end in spring, but according to the data released by American climate experts, the third La Nina phenomenon appears, so it may be affected by La Nina phenomenon in the summer of 2022. It is predicted that the climate situation in China will be more in the later period, with obvious regional and staged droughts and floods, more extreme weather, and rainy areas mainly concentrated in the northern region.

Recently, the circulation in the westerly belt of middle and high latitudes in Europe and Asia fluctuates greatly in stages, and cold air activities are frequent. Among them, the blocking high pressure in the Ural Mountain and the phased enhancement of the East Asian trough triggered three cold wave weather processes since late April.

Factors affecting temperature level

1, latitude, is the decisive factor, which affects solar height, day length, solar radiation and daily temperature difference. Annual range (the temperature days in low latitudes and annual range are smaller than those in high latitudes).

2. Topography refers to height, topography, shady slopes and sunny slopes, as well as mountains, plains, valleys and basins at different altitudes (for example, the topographic heat of valley basins is not easy to be lost, and the high terrain blocks the winter wind, and the mountains at the same latitude are worse than the plains every day, and the annual amplitude is smaller).

3. The location of land and sea and the strength of ocean have caused the interannual variation of temperature.

4. Ocean current warms up and humidifies, while cold current cools down and dehumidifies.

5. Weather conditions: The temperature in rainy places and annual range are lower than those in rainy places.

6. The underlying surface, ground reflectivity, snow reflectivity, low temperature, green temperature and annual variation are less than those of bare land.