Sains Malaysiana 44(7)(2015): 941945
Influence
of Monsoon on the Distribution of Organic Carbon in Inner Continental
Shelf Core Sediments, South China Sea, Malaysia
(Pengaruh Monsun ke
atas Taburan Karbon Organik dalam Sedimen Teras Pelantar Benua
Dalam di Laut China
Selatan, Malaysia)
PANG SWEE
YUN1,
JURIFFAH
ARIFFIN1,
HII
YII
SIANG2,3
& NORHAYATI MOHD TAHIR,1,2*
1Environmental Research
Group, School of Marine and Environmental Science, Universiti Malaysia
Terengganu, Mengabang Telipot, 21030 Kuala Terengganu,Terengganu
Darul Iman, Malaysia
2Fellow Institute
of Oceanography and Environment, Universiti Malaysia Terengganu,
Mengabang Telipot,
21030 Kuala Terengganu, Terengganu Darul Iman, Malaysia
3School of Aquaculture
and Fisheries Science, Universiti Malaysia Terengganu, Mengabang
Telipot, 21030 Kuala Terengganu, Terengganu Darul Iman, Malaysia
Diserahkan: 4 Ogos
2014/Diterima: 17 Februari 2015
ABSTRACT
Three short sediment cores
(12-32 cm) from South China Sea off Southern Terengganu were collected
during May (post-Northeast monsoon) and September (pre-Northeast
monsoon) 2007. The concentration of total organic carbon (TOC) obtained ranged from 0.41-2.23
and 0.38-2.31% during post and pre-monsoon, respectively. TOC
concentration was found to decrease with depth and
distance from the coast and river mouth. In particular, station
with close proximity to the coast exhibits most pronounced variation
of TOC with depth. Besides spatial variation,
it is noted that the seasonal variations also considerably affect
the distribution and concentrations of TOC, where both near and offshore
sampling stations showed significant variations in TOC content
during May and September sampling. These findings suggest the importance
of terrestrial organic carbon flux, physical mixing and seasonal
variations in regulating the concentration and distribution of the
organic carbon in the study area.
Keywords: Autochthonous organic
carbon; fluvial transport; land-based organic matter; seasonal influence;
Southern South China Sea
ABSTRAK
Tiga turus sedimen pendek (12-32
cm) telah diambil di Laut China Selatan dalam bulan Mei (pos-Monsun
Timur Laut) dan September 2007 (pra-Monsun Timur Laut). Kepekatan
jumlah karbon organik (TOC) yang diperoleh adalah antara 0.41-2.23% bagi pos monsun
manakala bagi pra-monsun adalah antara 0.38-2.31%. Kepekatan TOC
didapati berkurangan dengan jarak dari pesisir pantai
dan muara sungai. Kepekatan TOC
juga didapati berkurangan dengan kedalaman turus sedimen
pada semua stesen, dengan stesen yang paling dekat dengan pesisir
pantai mempamerkan perubahan kepekatan yang paling ketara. Perubahan
musim juga memberi kesan kepada taburan dan kepekatan TOC dengan kedua-dua stesen berdekatan pesisir pantai dan
luar pantai mempamerkan perbezaan kepekatan TOC yang
signifikan pada musim Mei dan September. Penemuan ini menunjukkan
bahawa fluks karbon organik daratan, percampuran fizikal dan perubahan
musim adalah penting dalam mengawal kepekatan dan taburan karbon
organik di kawasan kajian.
Kata kunci: Angkutan sungai; bahan organik daratan; karbon organik
autokran; Laut China Selatan; pengaruh musim
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*Pengarang untuk surat-menyurat; email:
hayati@umt.edu.my
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