Japan Geoscience Union Meeting 2023

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A (Atmospheric and Hydrospheric Sciences ) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS04] Advances in Tropical Cyclone Research: Past, Present, and Future

Tue. May 23, 2023 9:00 AM - 10:15 AM 103 (International Conference Hall, Makuhari Messe)

convener:Satoki Tsujino(Meteorological Research Institute), Sachie Kanada(Nagoya University), Kosuke Ito(University of the Ryukyus), Yoshiaki Miyamoto(Faculty of Environment and Information Studies, Keio University), Chairperson:Satoki Tsujino(Meteorological Research Institute), Sachie Kanada(Nagoya University)

10:00 AM - 10:15 AM

[AAS04-05] Consistent Pattern of Rainfall Asymmetry in Binary Tropical Cyclones

*Haoyan Liu1, Jian-Feng Gu2, Yuqing Wang3 (1.Hohai University, 2.Nanjing University, 3.University of Hawaii at Manoa)

Keywords:binary tropical cyclones, asymmetric rainfall

The rainfall distribution in each TC of binary-TC systems may be more complicated than that in a single TC. Whether the rainfalls of binary TCs have some special features has not been studied before. This observational study examines the rainfall distribution in binary TCs over the western North Pacific during 2001 to 2020. The results show that the asymmetric component of TC rainfalls strengthened with the decreasing of the separation distance between the two TCs. If orient binary TCs in the west-east direction, the rainfalls of the western TC were distinctly weakened in its Quadrant IV. The suppression effect cannot be neglected within 2050-km separation distance between binary TCs. Composite analyses indicate that the asymmetric rainfalls in one of the binary TCs were related to the deep-layer vertical wind shear (VWS) induced by its companion. The consistent pattern of rainfall asymmetry indicates a highly predictable component of rainfall distribution at vortex-scale in binary TCs and can help improve the precipitation forecast of binary TCs.