Why are there so many abnormal weather events in 2021?

The fundamental reason is that global warming has exacerbated the instability of the climate system. Global warming will change the global atmospheric circulation situation and affect local climate through the interaction between the ocean and the atmosphere, and the land and the atmosphere. Global warming has caused extreme weather and climate events such as heavy rains, floods, droughts, typhoons, high temperature heat waves, cold waves, and sandstorms to occur frequently and intensify in some areas.

The northerly wind near the ground caused by the cold vortex causes a reversal of wind direction. The northerly wind near the ground is conducive to the uplift of warm and moist airflow. In addition, the air above the middle level is invaded by dry and cold advection caused by cold vortices, forming a structure of warm and wet at the bottom and dry and cold at the top. This unstable stratification is conducive to the stimulation of strong convection.

At the same time, sometimes the southward movement of the cold vortex will also increase upper-altitude winds, resulting in stronger divergence of upper-level thunderstorm clouds. Greater vertical wind shear will also help convert horizontal momentum into vertical momentum, increasing the The intensity of strong convection.

It is precisely because of the frequent southward movement of the cold vortex that it even suppressed the subtropical high in July. At the same time, the participation of the warm and moist jet stream caused strong wind shear near the surface. As a result, the number of tornadoes this year was and intensity are on the high side, as are strong convective activities.

El Ni?o phenomenon

Appearing in Peru and Ecuador, it may cause abnormal warming of sea water and mass death of fish. Cause: Due to the weakening of the southeast trade winds near the equator in the southern hemisphere, cold water in the Pacific region overflows, leading to a large-scale warming of sea water temperatures, abnormal equatorial ocean currents and atmospheric circulation, resulting in abnormal precipitation in the Pacific coastal areas, causing floods on one side and floods on the other. On the other hand, there is a severe drought.

Thunderstorm in Lake Maracaibo

Located at the mouth of the Catabo River in Venezuela, there is a mysterious lake, Lake Maracaibo. This area of ??water is also known as the City of Lightning. In this place, lightning is shrouded in more than 300 days a year. Cause: This lake is located in the northern part of the Andes Mountains. Due to the unique geographical environment and hot and humid environment, it is an excellent environment for the formation of thunderstorms, creating this mysterious lake, and September every year is the peak period of thunderstorms.

Fire cyclones and waterspouts

The previous fire cyclone that occurred in the Agganil region of Portugal caused great damage and casualties to the local area. This was due to vegetation such as forests. When a fire occurs in a rich place, the temperature and thermal energy gradient of the air meet certain conditions, and the flames form a vertical vortex, a rare phenomenon that shoots straight into the sky like a whirlwind.

The same is true for waterspouts. Usually in coastal areas, typhoons or tornadoes pass through the sea and roll up a large amount of seawater to form waterspouts, also commonly known as "dragons taking water". Both extreme weather conditions are extremely destructive.