Sains Malaysiana 46(10)(2017): 1735–1741
http://dx.doi.org/10.17576/jsm-2017-4610-09
Identifying
the Monotonic Trend in Climate Change Parameter in Kluang
and Senai, Johor, Malaysia
(Mengenal Pasti Tren Berekanada di dalam Parameter Perubahan Iklim di Kluang
dan Senai, Johor, Malaysia)
FIRDAUS MOHAMAD
HAMZAH*,
FARAHANI
MOHD
SAIMI
& OTHMAN JAAFAR
Department of Civil
and Structural Engineering, Faculty of Engineering and Build Environment,
Universiti Kebangsaan Malaysia, 43600
UKM Bangi,
Selangor Darul Ehsan, Malaysia
Received: 29 January
2017/Accepted: 29 August 2017
ABSTRACT
Presently, climate change plays
an important role as it gives a serious impact to the living things
on earth. Analyzing the trend of climate change is very important
in identifying the pattern of changes because it can give an initial
overview for future analysis. In this study, trend analysis was
carried out to study the pattern of changes for five climate change
parameters, such as total amount of monthly precipitation (mm),
monthly average temperature (°C), monthly average global radiation
(MJm–2),
monthly average wind speed (m/s) and monthly average humidity
(%) during the period of 1974 to 2010. Comparisons were made between
two research stations, which were the Senai
International Airport and Kluang Meteorological Stations. In this study, the Mann-Kendall
trend test and Sen’s slope estimator test were used to identify
the monotonic trend for these climate change parameters. As a
result of this analysis, the precipitations showed no trend for
both locations and the radiation showed no
trend in Kluang from both analyses.
Meanwhile, other parameters in Senai
and Kluang showed a monotonic trend,
according to the Tau value (Z) and the Sen’s slope value. The
temperature shows a positive trend for both locations.
Keywords: Climate change parameter;
Mann-Kendall trend test; monotonic trend; non-parametric trend
estimator; Sen’s slope estimator test
ABSTRAK
Perubahan iklim memainkan
peranan yang penting
pada masa kini berikutan kesan serius terhadap kehidupan di bumi. Analisis tren perubahan iklim amat penting
dalam mengenal
pasti perubahan coraknya kerana analisis ini dapat
memberi gambaran
awal dalam membuat
analisis lanjutan.
Dalam kajian ini,
analisis tren
dilakukan untuk melihat perubahan iklim bagi parameter perubahan iklim, iaitu jumlah jatuhan
hujan bulanan
(mm), purata suhu bulanan
(°C), purata radiasi global
bulanan (MJm–2),
purata kelajuan
angin bulanan (m/s) serta purata kelembapan
bulanan (%) sepanjang
tempoh 1974 sehingga 2010. Perbandingan dibuat antara dua
stesen kajian,
iaitu stesen meteorologi
Lapangan Terbang
Antarabangsa Senai dan Stesen Meteorologi
Kluang. Dalam
kajian ini, ujian
tren Mann-Kendall dan
ujian anggaran kecerunan Sen digunakan
bagi melihat
tren parameter perubahan iklim. Keputusan daripada analisis
ini menunjukkan
tiada tren parameter hujan bagi kedua-dua
kawasan dan
radiasi juga tidak menunjukkan tren keputusan daripada kedua-dua analisis. Manakala parameter lain menunjukkan tren berekanada di Senai dan Kluang berdasarkan
nilai Tau (Z) dan
nilai kecerunan Sen. Tren positif ditunjukkan
bagi suhu
di kedua-dua kawasan.
Kata kunci: Anggaran
tren tak berparameter; parameter perubahan
iklim; tren
berekanada; ujian anggaran kecerunan Sen; ujian tren Mann-Kendall
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*Corresponding author; email: fir@ukm.edu.my