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Intraseasonal variation of raindrop size distribution at Koto Tabang, West Sumatra, Indonesia
Department of Electronic and Control Systems Engineering, Shimane University, Shimane, Japan
Department of Electronic and Control Systems Engineering, Shimane University, Shimane, Japan
Department of Electronic and Control Systems Engineering, Shimane University, Shimane, Japan
Department of Electronic and Control Systems Engineering, Shimane University, Shimane, Japan
Department of Telecommunications and Computer Networks, Osaka Electro-Communication University, Neyagawa, Japan
Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Uji, Japan
Intraseasonal variation of raindrop size distribution (DSD) in response to Madden Julian Oscillation (MJO) is studied using a 2D video disdrometer (2DVD), a boundary layer radar (BLR) and the Equatorial Atmosphere Radar, operated at Koto Tabang, west Sumatra, as well as GOES-9 infra-red brightness temperature. As a parameter of DSD, ΔZ MP , which is defined as the difference between a measured radar reflectivity in dB and that from the Marshall-Palmer (MP) radar reflectivity (Z) - rain rate (R) relationship, Z = 200 R 1.6, is used. It is found that in non-active phase of MJO, 2DVD-derived ΔZ MP s are generally positive, indicating that DSDs are broad, while they decrease toward negative values as the phase of MJO shifts to active ones. Rain-top height derived from the BLR indicates that the convective processes are more intense in the non-active MJO phase than in the active phase, which would cause the difference in DSDs.
Received 31 December 2004; accepted 11 March 2005; published 2 April 2005.
Citation: (2005), Intraseasonal variation of raindrop size distribution at Koto Tabang, West Sumatra, Indonesia, Geophys. Res. Lett., 32, L07803, doi:10.1029/2004GL022340.
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