Are sea levels really rising ?

Question

global warming, so called, seems to indicate that sea levels are rising - but are they ? when I go to the beach it seems that the sea is pretty much where it was years ago... and all the sea walls and harbour walls and so on built decades or even centuries ago seem to be ok too. So, are sea levels really rising, and where is the real proof ?

Answer 1

I doubt that anyone will ever notice on any give day that the sea level has changed. It is a slow process that will not be realized for decades.

The visible proof of global warming is what is happening to our weather. We look at a few isolated incidents and think perhaps they are an indication but it is also a slow shift not really noticeable. The storms we have had over the last two years have happened before only in different places.

To see the real change you have to be able to look back several decades and see what the true change is.

My father grew up in the depression years and raised his family, I being the first, during the 1940's and 1950's.
I remember as a child that the winters were always cold beginning in December and lasting all the way until March. We had Snow that we rarely see today and I live in the middle part of the United States.

We grew up in a small town that had a river that ran along side it.
During the 1930's it got so cold, and long enough, that the river would freeze over allowing the town's people to drive their cars on it and play Ice hockey. In my entire life, beginning in 1941, it has never been that cold and as time goes on it is much less so.

So in a little over half a century we have gone from what we use to consider normal winters to anything but. Whole months now with temps way above normal. Now we have an ice and snow storm going through the mid west but nothing like it use to be. And the prediction for this summer is scary. Summers are hot enough here to think it could be worse is not a comforting thought.

So don't look to the sea level for proof of global warming. It is all around you but so hard to see without a history perspective. But rest assured it is happening and now that other countries have caught up with us in the use of our resources expect it to accelerate.

Answer 2

Yes, they are rising overall (albeit it to slow to notice in periods of short years). But they may actually be falling in some areas. The currents of the oceans are what help determine sea levels also. Part of the great concerns of global warming and the melting of polar ice caps is that these ocean currents will be disrupted and some areas will see dramatic increases in ocean levels, more so than in some other areas. One possible scenario? A flooded Florida as well as many of the areas on the heavily populated East Coast of the U.S.

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Answer 5

They are rising by inches not dozens of feet! If the world sea level rises by one inch that's about 500 million tons of melted polar ice. They are rising and have been for decades but by a few milimeters each year.

Answer 6

The oceans are warming, glaciers are melting, the Arctic and Greenland Ice Sheets are receding. Yeas, the oceans are rising, but it isn't noticeable yet.

Note to mark m: ozone depletion and global warming are two distinct phenomena.

Answer 7

why of course the ozone layer is being destroyed by man which in turn is melting the polar caps to increase sea levels

Answer 8

Sea level rise is an increase in sea level. Multiple complex factors may influence such changes.

The sea has risen more than 120 metres since the peak of the last ice age about 18,000 years ago. The bulk of that occurred before 6,000 years ago. From 3,000 years ago to the start of the 19th century sea level was almost constant, rising at 0.1 to 0.2 mm/yr; since 1900 the level has risen at 1 to 3 mm/yr;[1] since 1992 satellite altimetry from TOPEX/Poseidon indicates a rate of about 3 mm/yr.[2] This change may be the first sign of the effect of global warming on sea level.[citation needed] Global warming is predicted to cause significant rises in sea level over the course of the twenty-first century.
Various factors affect the volume or mass of the ocean, leading to long-term changes in eustatic sea level. The two primary influences are temperature (because the volume of water depends on temperature), and the mass of water locked up on land and sea as fresh water in rivers, lakes, glaciers, polar ice caps, and sea ice. Over much longer (geological) timescales, changes in the shape of the ocean basins and in land/sea distribution will affect sea level.

Observational estimates are that the rise in sea level due to rising temperature is about 1 mm/yr over recent decades. Observational and modelling studies of mass loss from glaciers and ice caps indicate a contribution to sea-level rise of 0.2 to 0.4 mm/yr averaged over the 20th century

Geological influences
Comparison of two sea level reconstructions during the last 500 Myr. The scale of change during the last glacial/interglacial transition is indicated with a black bar. Note that over most of geologic history, long-term average sea level has been significantly higher than todayAt times during Earth's long history, continental drift has arranged the land masses into very different configurations from those of today. When there were large amounts of continental crust near the poles, the rock record shows unusually low sea levels during ice ages, because there was lots of polar land mass upon which snow and ice could accumulate. During times when the land masses clustered around the equator, ice ages had much less effect on sea level. However, over most of geologic time, long-term sea level has been higher than today (see graph above). Only at the Permo-Triassic boundary ~250 million years ago was long-term sea level lower than today.

During the glacial/interglacial cycles over the past few million years, sea level has varied by somewhat more than a hundred metres. This is primarily due to the growth and decay of ice sheets (mostly in the northern hemisphere) with water evaporated from the sea. The melting of the Greenland and Antarctica ice sheets would result in a sea level rise of approximately 70 meters.[3]

The Mediterranean Basin's gradual growth as the Neotethys basin, begun in the Jurassic, did not suddenly affect ocean levels. While the Mediterranean was forming during the past 100 million years, the average ocean level was generally 200 meters above current levels. However, the largest known example of marine flooding was when the Atlantic breached the Strait of Gibraltar at the end of the Messinian Salinity Crisis about 5.2 million years ago. This restored Mediterranean sea levels at the sudden end of the period when that basin had dried up, apparently due to geologic forces in the area of the Strait.

In 2001, IPCC's The Third Assessment Report IPCC predicted that by 2100, global warming will lead to a sea level rise of 9 to 88 cm (details below).

These sea level rises could lead to difficulties for shore-based communities: for example, many major cities such as London and New Orleans already need storm-surge defenses, and would need more if sea level rose, though they also face issues such as sinking land.[10]

Future sea level rise, like the recent rise, is not expected to be globally uniform. Some regions show a sea level rise substantially more than the global average (in many cases of more than twice the average), and others a sea level fall.[11] However, models disagree as to the likely pattern of sea level change.

for more information go to http://en.wikipedia.org/wiki/Sea_level_rise

Answer 9

Its rising becuase of the moon's tides i think...

Answer 10

yes they are but only in inches