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AGU: Geophysical Research Letters

 

Keywords

  • dual-Doppler lidar
  • horizontal convective roll
  • near-surface streak

Index Terms

  • Atmospheric Processes: Boundary layer processes
  • Atmospheric Processes: Convective processes
  • Atmospheric Processes: Remote sensing

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 35, L14808, 5 PP., 2008
doi:10.1029/2008GL034571

Dual-Doppler lidar observation of horizontal convective rolls and near-surface streaks

Hironori Iwai

National Institute of Information and Communications Technology, Tokyo, Japan

Shoken Ishii

National Institute of Information and Communications Technology, Tokyo, Japan

Nobumitsu Tsunematsu

National Institute of Information and Communications Technology, Tokyo, Japan

Kohei Mizutani

National Institute of Information and Communications Technology, Tokyo, Japan

Yasuhiro Murayama

National Institute of Information and Communications Technology, Tokyo, Japan

Toshikazu Itabe

National Institute of Information and Communications Technology, Tokyo, Japan

Izumi Yamada

Electronic Navigation Research Institute, Tokyo, Japan

Naoki Matayoshi

Japan Aerospace Exploration Agency, Tokyo, Japan

Dai Matsushima

Faculty of Engineering, Chiba Institute of Technology, Narashino, Japan

Sha Weiming

Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan

Takeshi Yamazaki

Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan

Toshiki Iwasaki

Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan

Dual-Doppler lidar and heliborne sensors were used to investigate the three-dimensional (3D) structure of the wind field over Sendai Airport in June 2007. The 3D structures of several-hundred-meter-scale horizontal convective rolls (HCRs) in the sea-breeze layer were observed by the dual-Doppler lidar. The scale of the HCRs determined by the heliborne sensors roughly agreed with that determined by the dual-Doppler lidar. Analysis of the dual-Doppler lidar data showed that the region of upward flow in the HCRs originated in near-surface low-speed streaks. This structure is consistent with the results of large-eddy simulations of the atmospheric boundary layer. The aspect ratios of the HCRs were close to those predicted by linear theories.

Received 4 May 2008; accepted 18 June 2008; published 23 July 2008.

Citation: Iwai, H., et al. (2008), Dual-Doppler lidar observation of horizontal convective rolls and near-surface streaks, Geophys. Res. Lett., 35, L14808, doi:10.1029/2008GL034571.

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