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Scientists Create New Record of Singapore’s Sea Level History



NTU scientists create new record on Singapore's sea level history

Close-up of the core sample. Samples were put by rigorous laboratory methods and statistical analysis to obtain data to reconstruct Singapore̵

7;s sea level history. Credit: NTU Singapore.

Climate scientist at Nanyang Technological University Singapore (NTU, Singapore) has extended its known record of sea level Singapore nearly 10,000 years ago, providing a stronger dataset to help forecast future sea level rise.

One of the main challenges in climate change research is reconstructing history over thousands of years. To better understand the causes and effects of future changes Scientists need to learn from the past and understand it.

Separating ancient sediments from depths of up to 40 meters underground at the site at Singapore’s Marina South, an international team led by NTU researchers conducted samples with rigorous laboratory methods (e.g., identification of microfossils, such as foraminifera) and geophysical analysis. Statistics to get information Recreate Singapore’s sea level history.

for climate scientists The more sea level records go back in time, the more The picture becomes clearer for future forecasts. Changes in the beginning of the Holocene (100000-7000 years ago) was the last major event of natural warming in Earth’s history. As the ice sheet melts and warming oceans have caused sea levels to rise 20 meters over the past 3,000 years, sea levels in Singapore have stabilized. Before the latest 20th century acceleration due to climate change

Dr. Stephen Chua, Head of the Research Team He graduated as part of his doctoral work at the Earth Observatory of Singapore (EOS) and the Asian School of the Environment (ASE) at NTU Singapore, said: “By appointment with the Singapore sea level record of 10,000 Last year, we extracted important new information from the early Holocene. which is the period when sea level rises rapidly

NTU scientists create new record on Singapore's sea level history

The NTU Asian School of the Environment team behind Singapore’s sea level study is (LR): Associate Professor Adam Switzer, co-author Dr. Stephen Choa and Director of the Earth Observatory of the NTU Asian School of the Environment. Singapore Professor Benjamin Horton. Credit: NTU Singapore.

“This more detailed sea level record also has broader implications. For example, it will lead to more accurate local sea-level projections. It is a strategic approach for Singapore to adapt to climate change.”

Professor Maureen Raymo, co-founding dean of the Columbia Climate School at Columbia University. “This is one of the important types of information needed to plan effective adaptation measures in the face of continued sea-level rise due to ‘continuous sea level rise’,” said the author of the study, who was not involved in the study. to global warming The past tells the future”

Why the Marina South website for investigations?

Developing accurate ancient sea-level records required the extraction of sediments from ‘ideal’ deposits such as sea mud and mangrove forests.

NTU scientists create new record on Singapore's sea level history

The research team examined core samples extracted from depths up to 40 meters underground at the site at Singapore’s Marina South. Credit: NTU Singapore.

To select the best drilling site for accurate results Researchers examined thousands of existing borehole records. which is a record of holes drilled in the ground for infrastructure projects.

Associate Professor Adam Switzer, who leads the Coastal Laboratory at ASE and EOS and is Dr. Chua’s supervisor, said: “Finding the right place to drill is a huge effort. It took Stephen over a year to find information on old boreholes from various sources. Construction efforts over the past 30 years have only been to find records that may be appropriate. As a result, our understanding of the geology of the entire area has greatly improved.”

Helpful findings for Singapore’s coastal defense plan against rising sea levels

The study published in the journal peer-reviewed Holocene On June 4, 2021, the first conclusive evidence was found to suggest that mangrove forests existed only in the Marina South region for approximately 300 years before experiencing floods related to sea level rise at the time. that

at a depth of 20 meters above the current sea level Researchers found large amounts of mangrove pollen, suggesting that there was a mangrove coastline in southern Singapore nearly 10,000 years ago. NTU findings reveal that sea level rise during that period reached 10–15 m. m per year, which is likely to lead to the death of mangrove forests.

The findings provide useful insights to Singapore on how to adapt now and in the future. Because the island nation looks beyond engineering solutions. and incorporating natural methods to protect the country’s coastline.

Despite its adaptability and effectiveness in coastal defense But the study also highlights the limitations of mangrove forests in cases of rapid sea level rise. This confirms an earlier study written by NTU that mangroves would not survive if sea level rise exceeded 7 mm per year under high carbon emission scenarios.

Professor Benjamin Horton, Director of EOS, co-authored the study. “Sea level rise is a potentially catastrophic consequence of climate change. Due to rising temperatures melt ice sheets and warm sea water. The future incremental scenario depends on understanding. Sea level response to climate change Accurate estimates of historical sea level variability in Singapore provide context for such projections.”

Professor Philip Gibbard, Quaternary Geologist at the Scott Polar Research Institute at the University of Cambridge. provide independent opinions on research It underscores the importance of local records far from ice-covered areas such as Singapore.

“They present a model of the sea level change process that is uncomplicated by factors associated with aging. This important systematic contribution from Singapore and the region is a valuable record spanning the post-Ice Holocene period, helping to provide a general pattern of sea level change in the region. This memorandum can be further enhanced with further studies in the future.”


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More information:
Holocene (2021). doi: 10.1177/09596836211019096

Provided by Nanyang Technological University



reference: Scientists Create New Record of Singapore’s Sea Level History (2021, June 4). Retrieved June 6, 2021, from https://phys.org/news/2021-06-scientists-singapore-sea-level-. history.html

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