In the past 100 years, the world s sea level has risen by about how many centimeters

Sea level rise is a global phenomenon caused by global warming, melting polar glaciers, and thermal expansion of upper seawater.

Global sea levels have risen by 10-20 centimeters since the 20th century, making it a slow-onset natural disaster. Rising sea levels can inundate some low-lying coastal areas, increasing the intensity and frequency of storm surges. As a result of global warming, sea levels will inevitably rise by at least 1 metre in the next 100 to 200 years.

There are many factors contributing to sea level rise: ocean thermal expansion, melting of mountain glaciers, Greenland land ice and the Antarctic ice sheet, and most of the world's mountain glaciers have been retreating in the last century. For example, although the Tibetan Plateau did not necessarily have a unified and boundless ice sheet during the glacial period as the Antarctic continent today, one thing is certain: the mountain glaciers that once existed in abundance here gradually melted and disappeared over the long years.

Melting glaciers due to global warming are the main cause of sea level rise, but according to a July 10, 2012 study from the National Atmospheric Research Institute, sea levels will continue to rise for hundreds of years assuming that global greenhouse gas emissions stabilize and global temperatures do not increase.

In the study, the researchers said that this is very complicated, and the main reason is the thermal expansion of seawater. Even if the global temperature stabilizes, there is still a difference between the surface air temperature and the deep-sea temperature, and the temperature in the deep sea will slowly rise, which will lead to more thermal expansion of the seawater, which will then increase the overall volume of the seawater and rise the sea level. This reaction will continue for a considerable period of time, and will not stop until the sea water has reached a certain equilibrium with the atmospheric temperature, which is estimated to be 300 years.

China's offshore sea level has risen by 9 centimeters in the past 30 years.

China's offshore sea level has risen by 9 centimeters in the past 30 years.

Sea level is the average height of the sea. It is determined by comparison of the height with the standard plane, however the complex and difficult measurements involved make it difficult to accurately determine sea level.

There has been a recent trend of rising sea levels. It has been determined that the average rate of sea level rise along the coast of the People's Republic of China in recent years is millimeter years, which is slightly higher than the global rate of sea level rise.

Sea level is often used as a criterion for altitude in geographical surveys, for example, the altitude of the People's Republic of China is used as the zero point of the mean sea level of the Yellow Sea, which is estimated from long-term observations at the Qingdao Port tide gauge station.

Sea level rise is a phenomenon in which sea levels rise due to melting glaciers in the Arctic and Antarctic (global warming).

In the past 30 years, the sea level along China's coast has risen by 9 centimeters overall; By 2050, China's coastal sea level will rise by 13 to 22 centimeters ...... compared to 2000A few days ago, the State Oceanic Administration released the recent major discoveries made in the marine field.

Studies have shown that in the past 30 years, the sea level along China's coast has risen by 9 centimeters, with the Tianjin coast rising the fastest at 20 centimeters, followed by Shanghai at 12 centimeters, Liaoning, Shandong, and Zhejiang all exceeding 10 centimeters, and Fujian and Guangdong with a lower rise of 5 to 6 centimeters. The overall trend is "high in the north and low in the south", with a faster increase along the Tianjin coast and the Yangtze River Delta, and a slower rise in the Fujian and Guangdong coasts. According to **, the rising trend of sea level along China's coast will further intensify in the future, and the sea level will rise by 13 to 22 centimeters in 2050 compared to 2000.

In addition, China's coastal sea ice is also showing a gradual melting trend: from the early 50s to the mid-80s of the last century, the average sea ice grade of the Bohai Sea is 3, after the mid-80s, with climate change, the Bohai sea ice is lighter, the ice level has become an average of 2 per year, and the ice area has decreased by 20%. After 1990, the Bohai ice age was shortened from 120 days to 80 days, a decrease of about one-third.

Preliminary analysis shows that the decrease of sea ice in the Bohai Sea is consistent with the trend of increasing SST in China's coastal waters.

The study shows that according to the analysis of the SST data of 16 coastal stations in China, the annual average SST of China's coastal areas has increased in the last 43 years (1963-2006). Winter warming is even more significant, with an increase of . Coastal warming is significantly higher than the global average.

Sea levels rose at a rate of millimeters per year during the 20th century as new sources of water continued to flow into the ocean due to snow cover on land and melting glaciers. The NOAA study is based on recent satellite data.

Global warming is causing an accelerated rise in sea levels, which has become or will become a major disaster in the coastal zone. World sea levels have risen by an average of about 12 centimeters over the past 100 years, and after 100 years, sea levels will rise by about 1 meter by 2100. If protective measures are not taken, large areas of land and many coastal cities will first be flooded.

Nearly 70 of the world's coastal zones, especially the vast low-lying delta plains, will become a country, and the sea water can invade twenty or thirty to fifty or sixty kilometers, or even more. Many of the world's most famous cities, such as New York, London, Amsterdam, Venice, Sydney, Tokyo, Rio de Janeiro, Tianjin, Shanghai, Guangzhou, and many more, will be submerged. Some low-lying island nations in the South Pacific and Indian Oceans will be semi-submerged.

The Maldives is on the verge of disappearing, as the island nation is all between 1 and 2 meters above sea level.

Between 100 BC and 1000 AD, sea levels were relatively stable; In the 400 years since the beginning of the 11th century, sea levels have risen by an average of millimeters per year; From the beginning of the 15th century until the end of the 19th century, sea levels were relatively stable; Since the end of the 19th century, sea levels have risen by an average of more than 2 mm per year. **Published in the Proceedings of the National Academy of Sciences on the 20th.

mm years.

From 1993 to 2021, the rate of global mean sea level rise was millimeter-years; In 2021, global mean sea level reached its highest level since satellite observations began.

On August 3, the China Meteorological Administration released the "Blue Book of China's Climate Change (2022)". According to the Blue Book, ocean warming has accelerated since the late 80s of the 20th century, and the global average sea level has continued to rise. In 2021, the rate of global mean sea level rise was millimeter-years; In 2021, global mean sea level reached its highest level since satellite observations began.

Among them, the sea level change along the coast of China generally shows a fluctuating upward trend. From 1980 to 2021, the rate of sea level rise along China's coast was millimeter-years, higher than the global average for the same period. In 2021, the sea level of the Danxingxin coastal zone in China was 84 mm higher than the average of 1993 and 2011, the highest since 1980.

Studies have shown that global sea levels have risen over the past 100 years.

Centiloose lead rice. Centimeter. Millimetre.

Millimetre. The answer is true: a

The world will be a different sign, and many low-altitude countries will be hit like never before.

If the sea level rises by 66 metres, there may be some countries that do not exist, such as those at relatively low altitudes.

Then a lot of land will be completely submerged by the sea, and even some creatures will lose their lives.

Global sea level will rise by at least 6 meters in the future! Sea water will flood the coast from Florida to Bangladesh in the United States, and worse, even if countries** take active measures to curb global warming, they will not be able to reverse this phenomenon.

The latest study, published in the July 9 issue of the journal Science, shows that large swaths of the Greenland and Antarctic ice sheets will melt at a greater rate than they did 3 million years ago as temperatures fluctuate upward. Even if countries** introduce a series of measures to curb greenhouse gas emissions and slow down global warming, they still cannot reverse the trend of global ice sheet melting and sea level rise.

Andrea Dutton, author of the study and a tourist at the University of Florida in the United States, said that current global temperature conditions could lead to a future rise of at least 6 meters in the Earth's sea level, and some greenhouse gases will linger in the atmosphere for centuries. Melting ice sheets like this would seriously threaten major cities around the world, including Beijing and London, and even inundate some low-lying tropical islands.

Dutton pointed out that sea levels are likely to rise by 6 metres in the coming centuries, and even some ancient evidence suggests that this is likely to be more rapid, but this is a long-term effect and cannot be achieved in the short term.

Anders Carlson, a glacial geologist at Oregon State University in the United States, who co-authored the study, points out that studies have shown that the Greenland and Antarctic ice sheets play a significant role in modern sea level rise, with contemporary atmospheric carbon dioxide levels similar to those of 3 million years ago, when sea levels rose by at least 6 meters due to the melting of large amounts of ice sheets around the world. It will take some time for the ice sheet to melt and will not change significantly in the short term, but there is evidence that we may be lucky enough to see this effect.