Perbandingan Parameter Distribusi Butiran Hujan Arah Vertikal antara Fase Aktif dan Tidak Aktif Osilasi Madden Julian Menggunakan Metode Dual-Frequency Radar

Authors

  • Meri Yoseva Jurusan Fisika, FMIPA, Universitas Andalas
  • Mutya Vonnisa Jurusan Fisika, FMIPA, Universitas Andalas
  • Marzuki Marzuki Jurusan Fisika, FMIPA, Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.6.1.81-88.2017

Abstract

Distribusi ukuran butiran hujan atau raindrop size distribution (DSD) arah vertikal antara fase aktif dan tidak aktif Madden Julian oscillation (MJO) di Kototabang, Sumatera Barat, telah dibandingkan. Perbandingan dilakukan melalui parameter DSD yang dihitung menggunakan data Equatorial Atmosphere Radar (EAR) yang dikopling dengan data Boundary Layer Radar (BLR) selama proyek Coupling Processes In The Equatorial Atmosphere (CPEA)-I (10 April - 9 Mei 2004). Estimasi parameter DSD menggunakan metode dual-frequency. DSD dimodelkan dengan distribusi gamma dan parameternya didapatkan menggunakan metode momen. Dari penelitian ini terlihat bahwa intensitas curah hujan yang tinggi lebih banyak terjadi pada fase MJO tidak aktif dibandingkan dengan fase aktif. Perbedaan parameter DSD antara fase MJO aktif dan tidak aktif lebih jelas terlihat pada hujan dengan intensitas tinggi (R ≥ 20 mm/h). DSD selama fase tidak aktif mengandung lebih banyak butiran hujan berukuran besar daripada fase aktif. Hal ini ditandai dengan nilai Λ yang lebih kecil dan µ yang lebih besar selama fase tidak aktif. Banyaknya butiran hujan yang berukuran besar ini berdampak kepada nilai radar reflectivity (Z) dimana pada fase tidak aktif nilainya lebih besar dibandingkan pada fase aktif MJO. Dengan demikian, proses fisika yang menghasilkan butiran hujan yang berukuran besar dominan terjadi pada fase tidak aktif MJO.

 

Kata kunci: raindrop size distribution (DSD), Madden Julian oscillation (MJO), dual frekuensi,

Kototabang, Equatorial Atmosphere Radar (EAR)

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Published

2017-01-05

How to Cite

Yoseva, M., Vonnisa, M., & Marzuki, M. (2017). Perbandingan Parameter Distribusi Butiran Hujan Arah Vertikal antara Fase Aktif dan Tidak Aktif Osilasi Madden Julian Menggunakan Metode Dual-Frequency Radar. Jurnal Fisika Unand, 6(1), 81–88. https://doi.org/10.25077/jfu.6.1.81-88.2017

Issue

Vol. 6 No. 1 (2017)

Section

Articles

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Copyright (c) 2017 Meri Yoseva, Mutya Vonnisa, Marzuki Marzuki

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