Experts say that sea level affects the rising coastal cities
Brazil is preparing to host 30th UN meeting on climate change (COP30)In November 2025, Belem is expected to take place in the city of Para. One of the items covered during the event The effect of sea level on the planet.
With the advance of Climate change Over the years, the oceans have become one of the major aspects of the discussion among organizations who want to understand the future of the climate.
The theme also has the ecological system that affects the planet. For example, the Increased temperatures The global contributes to the heating of the oceans, as a consequence that causes it Sea level growth.
In an interview CNNEduardo Seigal, Deputy Director of Oceanographic Institute (IO) Sao Paulo University (USP)Explains that there is Two major causes of increasing sea level: the heat expansion of the water and the melting of glaciers. He believes that the current observations have increased more than 20 cm in the last century.
“From the initial estimates, the observed sea level has reached or exceeded the trash projection scenes. That is, the worst estimates have been confirmed so far. Compared to 2000, compared to 2000 15 and 35 cm worldwide.. In specific areas, it contains subscription processes and these values are up to 30%, ”he said.
Is sea level affecting the rising coastal cities?
Anything Coastal area Low height, in Brazil or other parts of the world, is influenced by increasing sea level.
Consequently, Professor Seagal said most of these areas would face The cutting processes Water and coastal environments, such as beaches disappear.
Currently, Brazilian cities such as Resifaye are already facing floods caused by changing. However, experts warn these Coastal floods become more frequent by increasing sea level.
In addition, attacking saltwater in the coastal areas compromises the freshwater reserves of the water table and changes the soil properties.
Barbed Rocha, Professor of Physical Oceanography, USP Oceanographic Institute of Physical Oceanography, said, “Avenues, ports, drainage systems and all coastal infrastructure are based on the last decades. Ie. The cutting caused by water height affects these infrastructure.
Rocha told Rocha that “it is important to highlight the global surface temperature rise in the global surface temperature, but increases the sea level and changes the sea level and changing the sea circulation samples” in the recent decades of global warming. CNN.
The main causes of sea level growth
- Water thermal expansion: In the first case, the deputy director of the USP’s Oceanographic Institute (IO) causes the temperature rise to expand the water, taking high space in the oceans and increases its level;
- Continental Melting: The second reason is related to this Melts from glaciers Terrestrial, which adds more water in the oceans.
How does science measure the sea level?
Science oversees changes in sea level through various complementary technologies. According to the Seagal, Maragraphs are one of the most common methods. These devices installed in the coastal areas record tidal behavior, which allows you to identify local variations in sea level over time.
From the beginning of the 1990s, Satellites Also monitored sea level on a global scale With high accuracy to provide stable data on the height of the sea. There are also GPS stations that can provide information to correct variations.
Rocha adds that sea heating is monitored by sensors installed on ships and autonomous boys. With this data combination, it can be observed Over the last 30 years average global sea level increased by 10 cm – The tendency to grow.
Sea elevation in Resife and Santa Caterina
In an analysis released by the US Space Agency (NASA), scientists have identified an increase of 0.59 cm in sea level by 2024. The previous models have predetermined an increase of 0.43 cm, which ensures that this height is faster than expected.
According to the Post Graduate Degree Professor Oswaldo Giro in geography at the Federal University of Pernambco (UFPE), the resifting flood is in favor of flooding. Hence, It is one of the most vulnerable Brazilian areas, especially sea level, especially in sea level.
“Considering the height of the sea level, the resipting city is the beginning of the coastal areas of the center and the braulia dull
Giro claims that the southern population in the center of Floranopolis has already experienced these effects more frequent and severity.
A recent example of a flood recorded in Porto Alegre Rio Grande Do SulIn May 2024, large amounts of rain and climate tide and coastal winds would be exacerbated.
Professor Seser Rocha believes that in South Brazil, especially in Santa Caterina, extreme natural events also intensify floods and floods.
For example, extrasropical hurricanes and hangover fall in strong winds, high waves and atmospheric pressure. Items that contribute to the height of the sea and further coastal floods.
How to adapt to the increase in sea level
It is not easy to deal with the weather consequences of a planet, so there is no easy answer to solving sea level growth. But experts say there are methods to reduce serious scenes.
Some ways:
- Change infrastructure and residents: Removing the structure and improve the protection of coastal areas;
- Restore coastal ecosystems: Return the mangroves, the dunes and shellies dissipate the power of the waves and capture the carbon;
- Rebuild the dunes and resting vegetation: Reconstruction of these areas returns sedimentary reserves, strengthens the beach and reduces the cutting;
- Tough works with timely: Coastal protection tasks are recommended only when it is indispensable to protect critical infrastructure.
However, the accumulated effects of climate change are sufficient to maintain sea level growth over the next centuries.
Our current actions can accelerate or slow down this height. All this depends on how we face climate change. Is still in time, and Significant reduction in greenhouse air emissions is critical to have this progress.
The trash in the oceans can be seen from space with satellites
