Page 357 - Contributed Paper Session (CPS) - Volume 2

CPS1887 Sahidan A. et al.

Modeling for seasonal pattern and trend of land
surface temperature in Taiwan
Sahidan Abdulmana, Apiradee Lim
Department of Mathematics and Computer Science, Faculty of Science and Technology, Prince
of Songkla University, Pattani, Thailand

Abstract:
Land surface temperature (LST) is one of the most significant factors of surface
atmospheric interaction. It is dramatically changed on an adequate
distribution and temporal evolution in time and space. Moreover, LST might
change the pattern from natural disaster in such cases of landslide, forest fire
and rainfall. This study focused in Taiwan which lies in northern tropic of cancer
and circles on earth at which the sun can be directly overhead. The aim of this
study was to examine the seasonal pattern and trend of average increase in
LST in Taiwan. The data was downloaded from Terra eight-day MODIS land
surface temperature product have ~ 1km2 pixels with 18 years. The natural
cubic spline was used to extract annual LST seasonal pattern without checking
to estimate the missing values. The result of this study showed that the
significant of using cubic spline was an appropriate number of the knots which
was eight knots. The seasonal patterns of different sub-regions in the same
region had similar patterns. In addition, there was a steady increase of LST in
June and the peak was in summer which was in July. From August, it was
rapidly declined and reached the lowest point in winter during December and
January. The trend indicated accelerate decrease in some regions at northern
part of Taiwan but, the northern and central part of Taiwan the trend is
accelerate increase in most regions.

Keywords
Land surface temperature; temperature pattern; trend analysis; natural cubic
spline

1. Introduction
The temperature of the land surface skin is known as Land Surface
Temperature (LST). Its could be measured at the interface between surface
materials such as roof of building, grass, snow, ice, water, soil, top of plant and
the atmosphere. LST is the hot or warm of the ground surface in the world
would feel to the touch in a particular location. LST is being increasingly
recognized and interested in developing methodologies to measure
temperature change from surface. Scientists monitor LST because the warmth
rising off world’s surface effects our world’s climate patterns and weather.
Moreover, they need to screen how growing land surface temperatures

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