10:45 AM - 12:15 PM
[ACG43-P06] Changes in the distribution of thunderbolt over the sea caused by the Kuroshio large meander
Keywords:the Kuroshio large meander, thunderbolt
Most of the previous studies on thunderbolt in Japan have been case studies, and there have been few studies from a climatological perspective.
In addition, most of the studies have been conducted on land-based thunderbolt, and only a few have been conducted on maritime thunderbolt.
One of them, Iwasaki (2014), showed the average distribution of thunderbolt from 2009 to 2012.However, this study did not examine thecold long-term changes. In recent years, the Kuroshio large meander has been occurring, and the resulting changes in sea surface temperature have an impact on the atmosphere.In addition, it has been pointed out that the masses of warm and cold water generated during the meander contribute to extreme weather events in coastal areas. From these previous studies, it is expected that the Kuroshio large meander will affect the distribution of thunderbolt. However, there are no studies that have examined the effects of the Kuroshio large meander on thunderbolt. Therefore, in this study, we focused on the Kuroshio large meander and examined how it changes the distribution of thunderbolt in the sea around Japan.In this study, I showed that the Kuroshio large meander may increase or decrease the number of thunderbolt in warm-core ring and cold water mass, respectively. The causes can be discussed as follows. In the warm-core ring, sea surface temperature and surface air temperature rise, and wind speed increases, causing heat and water vapor transport from the sea to the atmosphere to become more active. As a result, rising air current is strengthened, and it is thought that the environmental field where thunderbolt are likely to occur is created. In cold water mass, the opposite process occurs. The fact that the Kuroshio large meander, which occurs on a multi-year scale, affects the number of thunderbolts suggests that it will be possible to predict the number of thunderbolts over a long period of time, which has never been possible before.
In addition, most of the studies have been conducted on land-based thunderbolt, and only a few have been conducted on maritime thunderbolt.
One of them, Iwasaki (2014), showed the average distribution of thunderbolt from 2009 to 2012.However, this study did not examine thecold long-term changes. In recent years, the Kuroshio large meander has been occurring, and the resulting changes in sea surface temperature have an impact on the atmosphere.In addition, it has been pointed out that the masses of warm and cold water generated during the meander contribute to extreme weather events in coastal areas. From these previous studies, it is expected that the Kuroshio large meander will affect the distribution of thunderbolt. However, there are no studies that have examined the effects of the Kuroshio large meander on thunderbolt. Therefore, in this study, we focused on the Kuroshio large meander and examined how it changes the distribution of thunderbolt in the sea around Japan.In this study, I showed that the Kuroshio large meander may increase or decrease the number of thunderbolt in warm-core ring and cold water mass, respectively. The causes can be discussed as follows. In the warm-core ring, sea surface temperature and surface air temperature rise, and wind speed increases, causing heat and water vapor transport from the sea to the atmosphere to become more active. As a result, rising air current is strengthened, and it is thought that the environmental field where thunderbolt are likely to occur is created. In cold water mass, the opposite process occurs. The fact that the Kuroshio large meander, which occurs on a multi-year scale, affects the number of thunderbolts suggests that it will be possible to predict the number of thunderbolts over a long period of time, which has never been possible before.