Articles | Volume 19, issue 8
Ann. Geophys., 19, 889–897, 2001

Special issue: MST

Ann. Geophys., 19, 889–897, 2001

  31 Aug 2001

31 Aug 2001

Precipitating clouds observed by 1.3-GHz boundary layer radars in equatorial Indonesia

F. Renggono1, H. Hashiguchi2, S. Fukao2, M. D. Yamanaka4,3, S.-Y. Ogino3, N. Okamoto3, F. Murata3, B. P. Sitorus1, M. Kudsy1, M. Kartasasmita5, and G. Ibrahim6 F. Renggono et al.
  • 1Agency for the Assessment and Application of Technology (BPPT), Jakarta Pusat 10340, Indonesia
  • 2Radio Science Center for Space and Atmosphere, Kyoto University, Uji, Kyoto 611–0011, Japan
  • 3Graduate School of Science and Technology, Kobe University, Nada, Kobe 657–8501, Japan
  • 4Frontier Observation Research System for Global Change, Minato-ku, Tokyo 105–0013, Japan
  • 5National Institute of Aeronautics and Space (LAPAN), Jakarta Timur 13220, Indonesia
  • 6Indonesian Meteorological and Geophysical Agency (BMG), Jalan Angkasa I no 2 Kemayoran, Jakpus 10720, Indonesia

Abstract. Temporal variations of precipitating clouds in equatorial Indonesia have been studied based on observations with 1357.5 MHz boundary layer radars at Serpong (6.4° S, 106.7° E) near Jakarta and Bukittinggi (0.2° S, 100.3° E) in West Sumatera. We have classified precipitating clouds into four types: stratiform, mixed stratiform-convective, deep convective, and shallow convective clouds, using the Williams et al. (1995) method. Diurnal variations of the occurrence of precipitating clouds at Serpong and Bukittinggi have showed the same characteristics, namely, that the precipitating clouds primarily occur in the afternoon and the peak of the stratiform cloud comes after the peak of the deep convective cloud. The time delay between the peaks of stratiform and deep convective clouds corresponds to the life cycle of the mesoscale convective system. The precipitating clouds which occur in the early morning at Serpong are dominated by stratiform cloud. Concerning seasonal variations of the precipitating clouds, we have found that the occurrence of the stratiform cloud is most frequent in the rainy season, while the occurrence of the deep convective cloud is predominant in the dry season.

Key words. Meteorology and atmospheric dynamics (convective processes; precipitation; tropical meteorology)

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