The sea level is rising, but why is the Bohai Sea getting smaller?

The Bohai Sea is shrinking because it is surrounded by land on both sides, and then the land area is expanding.

Because the extent of the Bohai Sea is shrinking as the sea level rises, it becomes smaller.

Due to the movement of the earth's crustal plates and the influence of the sediment content of the rivers, the Bohai Sea is becoming smaller.

Because the Bohai Sea is different from other seas, because of the special geological structure, it is getting smaller.

I think it may be due to the geographical location of the Bohai Sea, maybe it is at a lower altitude than other places.

Because the greenhouse effect causes global warming, the sea level rises, which affects the Bohai Sea.

Maybe it's because it's too dry nearby, so it's getting smaller.

While sea levels are rising, not most of them are rising.

The root cause is global warming.

Sea level rise is a global phenomenon caused by global warming, melting polar glaciers, and thermal expansion of upper seawater. Studies show that global sea levels have risen by 10 to 20 centimeters in the last 100 years and will accelerate in the future. But the actual sea level change in a certain part of the world.

It is also affected by the local vertical movement of land – slow crustal rise and fall and local land subsidence, and the sum of global sea level rise and local land rise and fall is the relative sea level change in the region. Therefore, it is only meaningful to study the relative sea level rise of a given region.

Note: Sea level rise is a slow-onset natural disaster for human survival and economic development. It is precisely because it is slow-onset that it is often not taken seriously, and it is thought that a rise of a few millimeters per year is not dangerous.

In fact, such disasters are cumulative and gradual. Combined with the effects of land subsidence in many coastal areas, a century of sea level and rise can reach 1 metre or even more. This is undoubtedly devastating for people in many places.

This is undoubtedly devastating for people in many places. And even now, it has brought harm to the people living in coastal areas. It has increased the frequency of catastrophic storm surges in coastal areas, intensified flooding, erosion of coastal lowlands and coasts, and coastal retreat.

Water pollution in coastal areas, salinization of farmland, increased tidal range, and strengthened wave action have weakened the capacity of coastal protective dikes, forcing designers to improve engineering design standards and increase project funding, which will also aggravate the seawater intrusion of estuariums, increase the difficulty of sewage discharge, and destroy the ecological balance.

The root cause is that the Tokyo Olympics referee released water, which caused a global phenomenon of sea level rise, and it will accelerate in the future.

Sea levels continue to rise, but the main cause is not melting glaciers.

However, sea level rise is not primarily due to melting glaciers. Wei Ke said that because the current global average temperature has only increased by degrees, the increase in temperature is limited. The main reason for the rise in sea level today is the expansion of the volume of seawater when it is heated.

As a result of the warming climate, the temperature increases from the surface of the sea to a depth of about 2 kilometers, causing the volume of the sea to expand. This causes about two-thirds of sea level rise, with only about three-thirds of sea level rise coming from melting snow and ice. However, as the melting of snow and ice increases in the future, its impact on sea level rise will increase.

Sea level rise is a small thing, and the rate of sea level rise is about 3 millimeters a year, and it will slowly increase. If we do not take action, it is estimated that by the end of the century, sea levels will rise by nearly 1 metre.

Don't think that this 1 meter is less, because when the sea level rises by 1 meter, if you encounter a typhoon or astronomical tide, the sea level will rise a lot, and the amount of water will increase sharply, and the impact will be very serious. And it can slowly erode the coastline, and the impact is also very serious.

Sea level rise has the greatest impact on coastal low-lying lands and islands. Therefore, in some international negotiations on climate change, many low-lying and small island states have formed an alliance, and they are the loudest and most anxious.

Causes of sea level rise 1The temperature of the sea rises. 2.

The flow of water from rivers into the ocean increases. 3.Glaciers melt.

4.Thermal expansion of the oceans. 5.

Land subsidence in coastal cities. Sea level rise could be a major disaster in the coastal zone. Over the past 100 years, the world's sea level has risen by an average of about 12 centimeters.

In 100 years, sea levels will rise by 1 metre and Tuvalu is in danger of submergence. By 2100, around 2100, Tuvalu will be in danger of drowning. If precautions are not taken, large areas of land and many coastal cities will be flooded first.

Nearly 70% of the world's coastal zone, especially the vast low-lying delta plains, will become a flooded country, and the sea water can invade more than 20 or 30 countries inside and outside. 230560 kilometers, or even further. Many world-famous cities are located on it, such as New York, London, Amsterdam, Venice, Tokyo, Rio de Janeiro, and many world-famous cities located on it, such as New York, London, Amsterdam, Indian Ocean, Tianjin, Shanghai, Guangzhou, etc.

Some low-lying island countries in the South Pacific and Indian Oceans will be semi-submerged. In 2001, the Pacific island nation of Tuvalu decided to relocate to New Zealand, becoming the first country in the world to abandon its home because of plans to raise sea levels. In November 2008, the Maldives was in danger of flooding due to rising sea levels.

Billions of dollars in tourism revenue are planned to be spent annually to buy new homes for 380,000 citizens. After Tuvalu, the Maldives will be the first country to relocate due to rising sea levels. In addition, rising sea levels will not only exacerbate storm surge hazards, but also increase the threat of flooding.

A storm surge is a phenomenon in which a typhoon or extratropical storm pushes seawater into a closed port, causing an abnormally high sea level. In August 2005, the southern city of New Orleans in the United States, with an average altitude below sea level, was hit by Hurricane Katrina, severely damaging the city's coastal protection system, turning the entire city into the sea, killing more than 2,000 people and causing more than $120 billion in damage. On May 22, 2008, Tropical Storm Nargis struck Myanmar.

The combination of storm surges, high waves and high sea levels has caused the world's worst storm surge disaster since 1991, killing more than 120,000 people and affecting about 2 million people. Environmental degradation. Rising sea levels have exacerbated coastal seawater intrusion and soil salinization.

For example, China's Bohai and Yellow Sea coasts are most threatened by seawater intrusion. Liaoning, Hebei, Tianjin, Shandong and other coastal areas have serious soil salinization.

The root causes of sea level rise are: global climate change, melting glaciers, and rising ocean temperatures.

1. Global climate change: Human activities have led to a large number of greenhouse gas emissions, which will form a layer of greenhouse effect in the atmosphere, making the earth's surface temperature continue to rise. As the temperature rises, so does the temperature of the ocean, which causes the volume of the sea to expand, which in turn leads to a rise in sea levels.

2. Melting glaciers: Global warming has led to the melting of glaciers, and these melting glacier water will flow into the ocean, causing sea levels to rise. Scientists estimate that the melting of glaciers around the world causes sea levels to rise by about millimeters per year.

3. Rising ocean temperature: As the temperature rises, so does the temperature of the ocean, which causes the volume of seawater to expand, which leads to a rise in sea level. In addition, glaciers in the ocean can also melt as ocean temperatures rise, leading to sea level rise.

How to stop sea level rise

Reducing greenhouse gas emissions is key to halting sea level rise. Carbon dioxide is the most important greenhouse gas. Therefore, reducing carbon dioxide emissions is an important means of halting sea level rise.

Leaders can reduce greenhouse gas emissions by enacting laws and regulations, encouraging companies to use clean energy, reducing the use of fossil fuels, and promoting low-carbon mobility.

The ocean is one of the largest carbon sinks on the planet, capable of absorbing large amounts of carbon dioxide. However, with increasing marine pollution and human activities such as overfishing, the ocean's ability to absorb carbon is gradually decreasing. Therefore, strengthening marine protection and reducing marine pollution and overfishing can increase the ocean's carbon absorption capacity, thereby slowing the rate of sea level rise.

The above content refers to Encyclopedia - Sea Level Rise.