Title: Nghiên cứu sự biến đổi cường độ xoáy thuận nhiệt đới hoạt động trên Biển Đông trong các giai đoạn phát triển
Abstract:The variation in intensity of tropical cyclones operating in the East Sea area is analyzed in the period 1991-2020.The results show that, tropical cyclones formed in the Pacific Northwest Sea usually ...The variation in intensity of tropical cyclones operating in the East Sea area is analyzed in the period 1991-2020.The results show that, tropical cyclones formed in the Pacific Northwest Sea usually have a longer duration, stronger intensity and more variability than those forming in the East Sea area.The formation and development of tropical cyclones on these two seas go through 4 stages: Forming, growing, maturity and disintegration stage.The forming stage usually lasts about 30 to 36 hours, starting from when the tropical cyclone forms as a disturbance to the tropical depression with increasing intensity.Their intensity increases rapidly (Vmax is usually greater than 20m/s) during the growing stage (about 36 to 54 hours).During the maturity stage (lasting about 48 to 72 hours), the intensity of tropical cyclones is little changed but they are usually stronger (Vmax is usually greater than 40 m/s) in the growing stage.The disintegration phase usually lasts from 1.5 to 2 days (the tropical cyclones operate from 3 to 9 days) and from about 3 to 4 days (the tropical cyclones operate for more than 9 days).During this stage, their intensity gradually decreases and becomes a tropical depression, even a low pressure area.Read More