The material erupted by the large-scale eruption of the submarine volcano in Tonga is about 30 km above the sky, much higher than the normal eruption, and may have reached the stratosphere.

In the case of a large-scale eruption, the temperature may drop temporarily on a global scale, but experts pointed out that "although the impact seems to be limited at this stage, detailed analysis is needed in the future." I am.

NASA = NASA's artificial satellite data shows that sulfur dioxide and volcanic ash released by this eruption have reached a height of about 30 km as fine particles = aerosols floating in the air. ..



If the altitude exceeds 10 kilometers in the atmosphere, it is considered to be the stratosphere.



According to Toshihiko Takemura, chief professor of the Institute of Applied Mechanics, Kyushu University, the large eruption of Mount Pinatubo in the Philippines in 1991 caused a large amount of ejecta to reach the stratosphere, resulting in weakening of the sunlight reaching the ground and the average temperature of the entire earth. Has dropped by about 0.5 degrees.



It is said that it also led to a decrease in rice production in Japan.



On the other hand, overseas experts have reported that the amount of sulfur dioxide released from this eruption is about one-fiftieth that of Mount Pinatubo.

Professor Takemura, Kyushu University "The temperature drop seems to be limited."

Professor Takemura said, "Although it is breaking news, at this stage, it seems that the temperature drop that affects the entire earth is limited. Because of the eruption of a submarine volcano, it is difficult for volcanic ash containing water to jump out to high places. There is a possibility that sulfur dioxide has been absorbed by water to some extent. In the future, we would like to conduct a detailed analysis to clarify in which area and to what extent there is a risk of impact. "

大規模噴火 地球全体の気候に影響を与えることも

トンガの大規模噴火で注目が集まった火山噴火と地球温暖化との関係。



二酸化硫黄は大気中で酸化して「硫酸塩」になり、火山灰とともに地上に届く太陽光を弱める働きをします。



特に、成層圏まで運ばれると、長期間大気を漂うため、その影響が大きくなるのです。



ピナツボ火山をはじめ、発生する頻度の低い大規模噴火などになると、地球全体の気候にも影響を与えることがあります。



今回のトンガの噴火のあと、SNS上でも「トンガの噴煙で温暖化が一気に解決？」などという書き込みがありましたが、九州大学応用力学研究所の竹村主幹教授は「地球温暖化問題は今後も長期的に続くだろう」と指摘しています。



竹村主幹教授は「今回の噴火で、もし、気温が低下するような影響があったとしても、その期間は一時的なもので、ピナツボの時でも2年程度の影響だった。地球温暖化は引き続き、長い期間、継続していくと予測される。変わらず取り組みを進めていくことが必要だ」と話していました。