SIMULASI HUJAN FRONT DENGAN MENGGUNAKAN MODEL WRF

Dadang, Subarna (2009) SIMULASI HUJAN FRONT DENGAN MENGGUNAKAN MODEL WRF. Seminar Nasional Penelitian, Pendidikan, dan Penerapan MIPA 2009. ISSN 978-979-96880-5-7

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Abstract

Frontal rain is rain that comes from a weather front. For example, a cold front lifts warm, moist air. This parcel of air is raised to the LCL, and higher. Saturation occurs first, and then precipitation forms. The prevailing mesoscale model WRF (V2.2) is used to simulate a heavy rain case caused by interaction between a move-in front and topographical heterogeneities on plain land. It is found that both thermodynamic and dynamic fields along the front are heterogeneous in time and space. The heterogeneity becomes more significant as the effect of topography is added on. The heterogeneous distribution of physical variables along the front is the main reason for the heterogeneous frontal rain band; the optimum cooperation of the low level and upper level jet is another reason for the development of rain band. Topography can strengthen the rainfall and causes extremely heavy rain cells. Updraft induced by topography extends to a rather low level, while the uplifted air by frontal circulation can reach to higher levels. The quasi-steady topography circulation overlaps the frontal circulation when the front moves over plain land; the adventageous cooperation of various mesoscale condition causes the large upward velocity on windward side of the land.

Item Type: Article
Uncontrolled Keywords: WRF, Frontal Rain, Typhoon, Simulation, Forecasting
Subjects: Prosiding > Seminar Nasional Penelitian, Pendidikan, dan Penerapan MIPA 2009
Divisions: Fakultas Matematika dan Ilmu Pengetahuan Alam > Jurusan Pendidikan Fisika
Depositing User: Eprints
Date Deposited: 04 Mar 2015 02:24
Last Modified: 04 Mar 2015 02:24
URI: http://eprints.uny.ac.id/id/eprint/12322

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