Diurnal Cycle Variation of Rainfall over Indonesia Using TRMM Data

Name: Andik Pribadi

keyword: Diurnal cycle

Abstract: Diurnal variations of rainfall over three sub-domains within Indonesia have been assessed using Tropical Rainfall Measuring Mission (TRMM) datasets (3B42) for the period of 2000-2009. Empirical orthogonal function (EOF) and harmonic analysis were used to reveal the spatial and temporal variability of rainfall over three box areas (A, B and C) which have been chosen on the basis of their distinct annual rainfall variability to represent the three rainfall regions within Indonesia. The EOF results show that the three regions have a dominant diurnal periodicity of rainfall which can be represented by the first and second EOF modes that explain the total variances (EOF1 + EOF2) of around 97%, 93% and 93% for region A, B and C respectively. The harmonic analysis results also show that the three regions have dominant diurnal periodicity of rainfall with mean total variances around 92%, 89% and 81% for region A, B and C respectively. The two methods also reveal similar diurnal cycle characteristics over our domain. The diurnal cycles of the three regions are marked by different amplitudes and phases, particularly over land and oceanic regimes. Region A, that encompasses the middle and the southern part of Indonesia, exhibits quite large amplitude of diurnal cycle with afternoon peak [1500-1800 Local Solar Time (LST)] over land and morning peak (0900-1200 LST) over ocean. Region B, that encompasses the north-western Indonesia, shows a little bit larger amplitude than region A with evening peak (1800-2100 LST) over land and morning peak (0600-1200 LST) over ocean. While region C, that encompasses the northeastern Indonesia, exhibits the smallest amplitude of the three regions with afternoon peak (1200-1 800 LST) over land and early morning to noon peak (0300-1200 LST) over ocean. Whereas over coastal areas, that is sea areas adjacent to islands, the same midnight peak (0000 LST) is exhibited for the three regions. The results of this study provide relevant information to understand the effects of land-sea formation on characteristics of diurnal cycle variations of rainfall, particularly over the Indonesian Maritime Continent.

King Mongkut's University of Technology Thonburi. KMUTT Library

Address: BANGKOK

Email: info.lib@mail.kmutt.ac.th

Name: Prungchan Wongwises

Role: Advisor

Created: 2011

Modified: 2555-10-31

Issued: 2012-10-31

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: JGSEE307

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Energy Management Technology

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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