Abstract
Abstract. Sea level rise becomes our concern nowadays as a result of variously contribution of climate change that cause by the anthropogenic effects. Global sea levels have been rising through the past century and are projected to rise at an accelerated rate throughout the 21st century. Due to this change, sea level is now constantly rising and eventually will threaten many low-lying and unprotected coastal areas in many ways. This paper is proposing a significant effort to quantify the sea level trend over Malaysian seas based on the combination of multi-mission satellite altimeters over a period of 23 years. Eight altimeter missions are used to derive the absolute sea level from Radar Altimeter Database System (RADS). Data verification is then carried out to verify the satellite derived sea level rise data with tidal data. Eight selected tide gauge stations from Peninsular Malaysia, Sabah and Sarawak are chosen for this data verification. The pattern and correlation of both measurements of sea level anomalies (SLA) are evaluated over the same period in each area in order to produce comparable results. Afterwards, the time series of the sea level trend is quantified using robust fit regression analysis. The findings clearly show that the absolute sea level trend is rising and varying over the Malaysian seas with the rate of sea level varies and gradually increase from east to west of Malaysia. Highly confident and correlation level of the 23 years measurement data with an astonishing root mean square difference permits the absolute sea level trend of the Malaysian seas has raised at the rate 3.14 ± 0.12 mm yr-1 to 4.81 ± 0.15 mm yr-1 for the chosen sub-areas, with an overall mean of 4.09 ± 0.12 mm yr-1. This study hopefully offers a beneficial sea level information to be applied in a wide range of related environmental and climatology issue such as flood and global warming.
Highlights
Sea level rise becomes our concern nowadays as a result of variously contribution of climate change that cause by the anthropogenic effects
Acceleration of sea level rise between the periods 1993 to 2009 when satellite measurements are available and in-situ data from tide gauges displayed the rate of 2.8 ± 0.8 mm yr-1 (Church and White, 2011), whilst altimetry suggested a consistent rate of 3.3 ± 0.4 mm yr-1 for a similar period 1993-2010 was recently revealed by Hay et al (2015)
The analysis of regional sea level rate over the Malaysian seas from multi-mission satellite altimetry has been conducted previously by Din (2014), with regard to the different techniques and various processing methods presented in this extensive study, the sea level trend for Malaysia region fulfilled that it has been rising with an overall mean of 4.47 ± 0.71 mm yr-1 based on altimeter and verticalcorrected tidal data
Summary
Sea level rise becomes our concern nowadays as a result of variously contribution of climate change that cause by the anthropogenic effects. Global sea levels have been rising through the past century and are projected to rise at an accelerated rate throughout the 21st century. Global sea levels have been rising through the past century and are projected to rise at an accelerated rate throughout the 21st century (IPCC, 2014). The analysis of regional sea level rate over the Malaysian seas from multi-mission satellite altimetry has been conducted previously by Din (2014), with regard to the different techniques and various processing methods presented in this extensive study, the sea level trend for Malaysia region fulfilled that it has been rising with an overall mean of 4.47 ± 0.71 mm yr-1 based on altimeter and verticalcorrected tidal data.
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