Yoshino, K., 2019: Low-level wind shear induced by horizontal roll vortices at Narita International Airport, Japan. J. Meteor. Soc. Japan, 97,
Early Online Release Graphical Abstract with highlights
Plain Language Summary: Aircrafts making landing and takeoff at Narita International Airport in Japan frequently report low-level wind shear (LLWS) with turbulence when the prevailing wind is southwesterly, which is crosswind to the runway direction. This study used observational data by a landing aircraft at the runway 16R and a single-Doppler lidar to demonstrate the existence and structure of horizontal roll vortices (HRVs) causing the LLWS encountered by the aircraft.
- A single-Doppler lidar detected various features of the HRVs such as high-speed wind bands, cross-roll flows (CRFs) perpendicular to the roll axes, and bands of Doppler spectrum width (DSW) minimum.
- The CRFs formed the LLWS in the scale of about 400m between the runway threshold and the touch down point.
- The bands of DSW minimum with high-speed wind may be used as indicators of downdrafts in the HRVs since the downdrafts transport less turbulent air with large momentum of the lowlevel jet in the upper convective mixed layer.