1995 Was Shandong Province hit by a storm?

By analyzing the causes of recent persistent snowstorms, experts believe that its climate background is mainly related to atmospheric circulation anomalies and La Nina events. In the past few years, there have been warm winters in many places. As we all know, this is caused by the influence of El Nino. According to experts, El Ni? o refers to the phenomenon of sea temperature warming in the equatorial central Pacific Ocean and the eastern Pacific Ocean. La Nina refers to the decrease of SST in the equatorial central Pacific and the eastern Pacific, which is the result of the interaction between tropical ocean and atmosphere. According to the monitoring of the National Climate Center, the La Nina event formed at the equator in August last year may last until the summer of 2008, and reach a moderate or strong level. Statistical analysis shows that the latitude of the mid-latitude atmospheric circulation is strengthened in the winter of the year when the strong La Nina event occurred, that is, the cold air activity is frequent. Affected by La Nina phenomenon, the water temperature in the equatorial eastern Pacific is low, and the meridional circulation in East Asia is abnormal, which often leads to the prevalence of northerly airflow in northern China, while the warm and humid airflow in southeast China is relatively weak. That is to say, cold air often goes south. As a result, strong cold waves and strong winds frequently occur in the north, but the rainfall continues to be less.

Since June 5438+ 10 this year, the cold air in the north has been splitting south, but the subtropical high is stronger than that in the north, blocking the cold air in the south, making cold and warm air meet frequently in the central and eastern regions of China, forming a large-scale long-term rain and snow weather.