5:15 PM - 6:45 PM
[ACG44-P05] The Impact of Warm SST and Cold SST over the Kuroshio Large-Meander to the Rainfall around the Kii Peninsula. A Case Study of Typhoon Talas (2011)
Keywords:Kuroshio large meander, SST, heavy rainfall, typhoon
We examined the effect of warm core and cold core associated with Kuroshio large meander to the rainfall around Kii peninsula by sensitivity experiment using WRF model as a case study of typhoon Talas 2011 which occurred in a nonlarge meander period.
As the result of our experiments, we found warm core increased horizontal water vapor but did not necessarily cause increased precipitation, and the cold core decreased horizontal water vapor but did not necessarily cause decreased precipitation. In addition to this, warm core and cold core weaken the convergence of water vapor flux by changing wind speed and wind direction, which are based on pressure change. This pressure anomaly is composed of the sum of the pressure adjustment mechanism and inhibition of the central pressure, inhibition of the central pressure which is based on the cold core dominates its pressure anomaly. In our research, the decrease in rainfall will be more than 300mm locally, and the average precipitation reduction over most of the Kii Peninsula could be more than 80 mm. If the Kuroshio meander occurred in 2011, a tragedy like the Kii Peninsula Flood might have been avoided and the number of victims might have decreased.
Hence, it is essential the strengthening of observation of Kuroshio route and the distribution of sea surface temperature (SST) around Kii peninsula, which is crucial not only from the perspective of meteorological and oceanography but also from disaster science for future prevention of disaster.
As the result of our experiments, we found warm core increased horizontal water vapor but did not necessarily cause increased precipitation, and the cold core decreased horizontal water vapor but did not necessarily cause decreased precipitation. In addition to this, warm core and cold core weaken the convergence of water vapor flux by changing wind speed and wind direction, which are based on pressure change. This pressure anomaly is composed of the sum of the pressure adjustment mechanism and inhibition of the central pressure, inhibition of the central pressure which is based on the cold core dominates its pressure anomaly. In our research, the decrease in rainfall will be more than 300mm locally, and the average precipitation reduction over most of the Kii Peninsula could be more than 80 mm. If the Kuroshio meander occurred in 2011, a tragedy like the Kii Peninsula Flood might have been avoided and the number of victims might have decreased.
Hence, it is essential the strengthening of observation of Kuroshio route and the distribution of sea surface temperature (SST) around Kii peninsula, which is crucial not only from the perspective of meteorological and oceanography but also from disaster science for future prevention of disaster.