Examination of 3-6 day Disturbances over Equatorial Indonesia Based on Boundary Layer Radar Observations during 1996-1999 at Bukittinggi, Serpong and Biak

Ipuk Widiyatmi; Hiroyuki Hashiguchi; Shoichiro Fukao; Manabu D. Yamanaka; Shin-Ya Ogino; Kenneth S. Gage; Sri Woro B. Harijono; Sri Diharto; Harjono Djojodihardjo

doi:10.2151/jmsj.79.317

Papers

Examination of 3-6 day Disturbances over Equatorial Indonesia Based on Boundary Layer Radar Observations during 1996-1999 at Bukittinggi, Serpong and Biak

Ipuk Widiyatmi, Hiroyuki Hashiguchi, Shoichiro Fukao, Manabu D. Yamanaka, Shin-Ya Ogino, Kenneth S. Gage, Sri Woro B. Harijono, Sri Diharto, Harjono Djojodihardjo

Author information

Ipuk Widiyatmi
Atmospheric Research and Development Center, National Institute of Aeronautics and Space (LAPAN)
Hiroyuki Hashiguchi
Radio Science Center for Space and Atmosphere, Kyoto University
Shoichiro Fukao
Radio Science Center for Space and Atmosphere, Kyoto University
Manabu D. Yamanaka
Graduate School of Science and Technology, Kobe University
Also working at Frontier Observation Research System for Global Change
Shin-Ya Ogino
Graduate School of Science and Technology, Kobe University
Kenneth S. Gage
National Oceanic and Atmospheric Administration
Sri Woro B. Harijono
Agency for the Assessment and Application of Technology (BPPT)
Sri Diharto
Indonesian Meteorological and Geophysical Agency (BMG)
Harjono Djojodihardjo
National Institute of Aeronautics and Space (LAPAN)

JOURNAL FREE ACCESS

2001 Volume 79 Issue 1B Pages 317-331

DOI https://doi.org/10.2151/jmsj.79.317

Details

Abstract

Spectral features of lower tropospheric horizontal wind observed during 1996-1999 by Bukittinggi, Serpong and Biak boundary layer radars show 3-6 day periodicities in zonal and meridional components and longer period zonal wind oscillations. Using bandpass filtering analysis the 3-6 day modes show a westward phase speed of about 700 km day^-1 and a zonal wavelength of about 3500 km, and propagate through the Indonesian maritime continent when the westerly wind is prevailing at Biak.

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