"The Strongest" Typhoon "Global Warming" Against the Background Against Next Year 17:02 on December 28

In Japan, five typhoons landed almost twice in normal years. Of these, No. 15 and No. 19 were the strongest classes in the typhoon that landed near Kanto for about 30 years, with statistics remaining. Brought. Experts point out that "the background of the typhoon is thought to be global warming, and it is necessary to prepare for the next severe disaster that will occur next year and beyond." You.

According to the Japan Meteorological Agency, the number of typhoons that occurred was 29, exceeding 25.6 in the normal year, and the number of landings in Japan was five times, almost 2.7 times the average in the normal year.

No. 15 landed near Chiba City in September, and the record of the maximum instantaneous wind speed was updated in various places, causing severe damage such as damage to buildings due to storms and long-term power outages, mainly in the Kanto and Izu Islands.

In addition, the 19th landed on the Izu Peninsula in October and passed through the Kanto and Tohoku regions, where the 120-hour rainfall at 120 points was the highest in 12-hour observation history. did.

Each of the two typhoons had a maximum wind speed of 40 meters at the time of landing, and was the strongest class since 1991, with statistics on the wind speed at the time of landing in Kanto and Shizuoka Prefecture remaining.

According to the latest analysis by the Japan Meteorological Agency, the cause of heavy rain caused by Typhoon No. 19 was largely related to the fact that "frontlines" that did not appear on the weather map before the center of the typhoon approached.

This front line was formed between the warm and moist air around the typhoon and the relatively cool air brought by the continental high pressure, and on the morning of October 12, the center of the typhoon was south of the Kii Peninsula, the front line was on the southern coast of the Kanto region. In addition, the rain had already intensified around the area, and at 9:00 pm on the 12th when the center of the typhoon was near Tokyo, the front line extended to Fukushima Prefecture, causing heavy rain in Tohoku, and the wind hit the mountains. In addition to the topographical factors that caused updrafts, record heavy rains occurred in various places.

Also, according to the Japan Meteorological Agency and experts, the large amount of water vapor flowing into the vicinity of Japan due to the approach of the typhoon is also a major factor in heavy rains.

Strong typhoon “global warming” in the background

Experts point to global warming as the background of the increase in strong typhoons.

The average temperature in Japan is expected to be the highest since the statistics began.

According to the Japan Meteorological Agency, it is estimated that the average temperature in Japan, calculated based on the observation data of 15 locations nationwide up to the last month, will be 0.92 degrees higher than normal.

January and February were warm winters, and the temperature remained high throughout the year. It surpassed 2016, which was 0.88 degrees higher than normal, and is the highest since Meiji 31 ​​when statistics began.

Also, the global average temperature is 0.42 degrees higher than normal, which is expected to be the second highest since 1891, when statistics remain.

According to the Japan Meteorological Agency, in recent years the temperature tends to be high, possibly due to the effect of global warming due to the increase of greenhouse gases such as carbon dioxide.

Expert "Seawater temperature rises and is stronger than typhoon forces"

Professor Kazuhisa Tsuboki of Nagoya University, familiar with the mechanism of typhoons, commented on the relationship between typhoons and global warming, saying, "The temperature of seawater rises with global warming and a lot of water vapor causes the typhoons to become stronger, Came to Japan while maintaining the same. Examples of this are thought to be Konoshi No. 15 and No. 19. " It is necessary to consider disaster prevention measures on the premise that a disaster will occur. "