The Temporal Evolution and Spatial Structure of the Local Easterly Wind “Kiyokawa-dashi” in Japan PART II: Numerical Simulations

• SASAKI Kaori

  National Agricultural Research Center for Tohoku Region

• SAWADA Masahiro

  Graduate School of Science, Tohoku University

• ISHII Shoken

  National Institute of Information and Communications Technology

• KANNO Hiromitsu

  National Agricultural Research Center for Tohoku Region

• MIZUTANI Kohei

  National Institute of Information and Communications Technology

• AOKI Tetsuo

  National Institute of Information and Communications Technology

• ITABE Toshikazu

  National Institute of Information and Communications Technology

• MATSUSHIMA Dai

  Graduate School of Science, Tohoku University

• SHA Weiming

  Graduate School of Science, Tohoku University

• NODA Akira T.

  Graduate School of Science, Tohoku University

• UJIIE Masashi

  Graduate School of Science, Tohoku University

• MATSUURA Yousuke

  Graduate School of Science, Tohoku University

• IWASAKI Toshiki

  Graduate School of Science, Tohoku University

Bibliographic Information

Other Title

• The temporal evolution and spatial structure of the local easterly wind "Kiyokawa-dashi" in Japan (part 2) Numerical simulations
• The Temporal Evolution and Spatial Structure of the Local Easterly Wind “Kiyokawa-dashi” in Japan PART II: Numerical Simulations

Abstract

A numerical simulation of the strong southeasterly (SE) “Kiyokawa-dashi” wind in Yamagata, Japan on August 30, 2004, is examined and compared to the Coherent Doppler Lidar (CDL) observation. Three-dimensional numerical simulations were performed using a non-hydrostatic meso-scale model developed by the Japan Meteorological Agency. The sensitivity of the numerical simulation was examined with respect to the resolution of the horizontal and vertical grid, surface roughness, and ground surface temperature. For the case of a 1-km grid with 85 vertical layers including realistic surface settings, the observed characteristics of Kiyokawa-dashi were well reproduced: the strong SE wind (10 m s^-1) was extremely low, about 0.1-0.5 km AGL, and the maximum wind speed over 12 m s^-1 was observed at 0.1-0.2 km, AGL, under the low-level stable layer. Strong winds appeared at the foot of the final lee slope facing the Shonai Plain and 1 km south of the valley; this result was in good agreement with the CDL observation. On the basis of the stream line analysis, Kiyokawa-dashi was strongly affected by the upper SE wind, i.e., upper air on the eastern side of the mountains blew down to the middle and lower layer on the western side. The strongest wind field located 1 km south of the valley was affected by the mountain at the southwestern end of the valley. It was observed from the sensitivity experiments that the height of the jet-like flow was found to be closely related to the low-level stable layer, and the critical layer was not very important in reinforcing the low-level SE wind. This case of Kiyokawa-dashi was explained on the basis of the hydraulic theory.

Journal

• Journal of the Meteorological Society of Japan. Ser. II

  Journal of the Meteorological Society of Japan. Ser. II 88 (2), 161-181, 2010

  Meteorological Society of Japan

Keywords

• Atmospheric Science

Details

• CRID: 1390282681480344704
• NII Article ID: 130005159714
• NII Book ID: AA00702524
• DOI: 10.2151/jmsj.2010-204
• ISSN: 21869057
• ISSN: 00261165
• NDL BIB ID: 10657826
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10657826
• Web Site: https://www.jstage.jst.go.jp/article/jmsj/88/2/88_2_161/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed