Doppler Radar Observation on the Orographic Modification of a Precipitating Convective Cloud in its Landing

• Kanada Sachie

  Institute for Hydrospheric-Atmospheric Sciences, Nagoya University

• Geng Biao

  Institute for Hydrospheric-Atmospheric Sciences, Nagoya University

• Yoshimoto Naohiro

  Institute for Hydrospheric-Atmospheric Sciences, Nagoya University Present affiliation: Division of Science Education, Osaka Kyoiku University

• Fujiyoshi Yasushi

  Institute for Hydrospheric-Atmospheric Sciences, Nagoya University Present affiliation: Institute of Low Temperature Sciences, Hokkaido University

• Takeda Takao

  Institute for Hydrospheric-Atmospheric Sciences, Nagoya University

Bibliographic Information

Other Title

• 対流性降水雲の地形による変質に関するドップラーレーダ観測
• Doppler Radar Observation on the Orographic Modification

Abstract

The orographic modification of a precipitating convective cloud, which formed in association with typhoon 9304 and travelled over the sea, was studied by mainly analyzing the dual-Doppler radar system observational data. From July 24 1900 LST, to July 25 0000 LST, many conective clouds landed at the southeastern coast of the Kii Peninsula. Although they reached the coast in various stages of development, most of them showed similar features. Their radar-echoes were intensified 10 to 20km off the coast before landing, and the radar-echoes were intensified again or broadened over land after their radar-echo intensities were reduced near the coast. Before the first intensification of convective radar-echoes over the sea, the echoes were intensified in their upper rear-parts 30 to 40km off the coast, and intensified in their front-parts near the coast. By averaging horizontal winds derived from the dual-Doppler radar system observational data for about two hours, it was shown that the ambient wind speed decreased near the coast, and the horizontal convergence zone larger than 10^-4s^-1 existed along the coast line about 10km off the coast. On the basis of these observational results the travelling convective clouds orographic modification, and the efficient formation of precipitation in them were discussed, taking into account the results of numerical experiment about the Kii Peninsula orographic effect on ambient winds. It can be inferred that the large rainfall amount recorded in association with the typhoon around the Kii Peninsula coast was caused as a result of the integration of travelling convective clouds orographic modification.

Journal

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

  Journal of the Meteorological Society of Japan. Ser. II 77 (1), 135-154, 1999

  Meteorological Society of Japan

Keywords

• Atmospheric Science

Details

• CRID: 1390001206506815744
• NII Article ID: 110001807518
• NII Article ID: 130007347171
• NII Book ID: AN00317933
• DOI: 10.2151/jmsj1965.77.1_135
• ISSN: 21869057
• ISSN: 00261165
• ISSN: http://id.crossref.org/issn/00261165
• NDL BIB ID: 4659279
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4659279
• Web Site: https://www.jstage.jst.go.jp/article/jmsj1965/77/1/77_1_135/_pdf
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10611606
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • NDL-Digital
  • CiNii Articles
• Abstract License Flag: Disallowed