11:00 AM - 11:15 AM
[ACG38-08] Observational study on boreal summer intraseasonal oscillations over the tropical Western North Pacific
★Invited Papers
Keywords:BSISO, Precipitation process, Air-sea interaction, Shipborne observation
In boreal summer season, one typical form of intraseasonal variability over the tropical Western North Pacific (WNP), Bay of Bengal, and Arabian Sea is so-called boreal summer intraseasonal oscillation (BSISO). The BSISO is characterized as a band of vigorous convection with thousands of kilometers length which migrates typically in a north-northeastern direction. Its widespread impacts to countries around these ocean basins through, for example, modulation of Asian monsoon circulation and activities of tropical depressions and typhoons/cyclones. Therefore, to understand the behavior of BSISO is not only of scientific interest but also of social importance.
In order to deepen our understanding of physical mechanisms for intensification and migration of the BSISO over the WNP, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) has repeatedly conducted research cruises using research vessel (R/V) Mirai since 1998. In these research cruises, the R/V Mirai stayed at a particular location for weeks to perform a variety of atmospheric and oceanographic measurements, such as C-band Doppler radar observation, upper-air soundings, and oceanographic measurements of temperature and salinity profiles. Analyses of observation data collected during these cruises have revealed many aspects of BSISO and other types of intraseasonal variability. In this talk, I will argue air-sea interaction and preconditioning processes for active convective phase of BSISO, and present initial results of our recent research cruises.
In order to deepen our understanding of physical mechanisms for intensification and migration of the BSISO over the WNP, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) has repeatedly conducted research cruises using research vessel (R/V) Mirai since 1998. In these research cruises, the R/V Mirai stayed at a particular location for weeks to perform a variety of atmospheric and oceanographic measurements, such as C-band Doppler radar observation, upper-air soundings, and oceanographic measurements of temperature and salinity profiles. Analyses of observation data collected during these cruises have revealed many aspects of BSISO and other types of intraseasonal variability. In this talk, I will argue air-sea interaction and preconditioning processes for active convective phase of BSISO, and present initial results of our recent research cruises.