Questions tagged [sea-level]

Questions regarding the height of the ocean's surface.

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26
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4answers
5k views

Why is relative sea-level falling in Hudson Bay?

Why is the sea level in Hudson Bay decreasing so much? Hudson Bay is pretty far up north, much closer to glaciers. Would it make sense for it to recede at this level with sources of fresh water ...
18
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2answers
722 views

Are there secondary causes of sea level change?

Aside from the fraction of water stored as ice on land and temperature of the water, are there other factors that change sea level, and if so what are is the magnitudes of the these changes? For ...
19
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1answer
1k views

What fraction of dry land is below sea level?

Someone just asked me if it would be practical to counter the rise of sea level by pumping water into storage on land. It struck me that if there is enough land below sea level, this would require ...
17
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1answer
158 views

What is the appropriate vertical datum to use globally?

When studying sea level changes, it is normal to analyze water level with respect to a common vertical datum. The most used datum is Mean Sea Level (MSL), which NOAA defines as "The arithmetic mean of ...
5
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1answer
948 views

Definitions of tidal harmonic constituents…?

Does anyone know where there is a detailed definition for tidal harmonic constituents? There is loads of stuff on $M_2$, $S_2$, $N_2$, etc. (all the common ones), but there are a great many more, some ...
14
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2answers
5k views

Effect on sea level if the Earth stopped rotating

Would sea level change at the equator if the Earth stopped spinning? I am assuming it is currently bulging around it due to centrifugal force.
12
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4answers
1k views

Would it be geographically feasible to store water on land to counteract sea level rise?

Based on a misunderstanding of another post, I prepared an estimate of how much water would be required to lower sea level by one meter. the main question would be: could this be stored on land?
6
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1answer
264 views

If ALL the ice melted, what percentage of the Earth's surface would be water?

At the present time, about 70% of the earth's surface is liquid water (perhaps that includes floating ice around Antarctica, and the Arctic Ice cap). What percentage of the Earth's surface would be ...
4
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1answer
165 views

If all the world's ice were to melt, would this shift the earth's centre of gravity with consequential effects on sea levels?

This question on Maths SE asked how we might calculate the effect on sea level if all the world's ice (ie including the whole Antarctic ice sheet) were to melt. I posted an answer containing ...
36
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6answers
8k views

Is the sea level rise unusual?

I'm discussing climate change with a friend who is a climate change denier, basically the argument is that looking at this graph, is not clear that something unusual is going on, so the sea level rise ...
27
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6answers
6k views

How much will sea level rise if all the polar ice melts?

There are many movies about global warming, which say that melting of all polar ice would cause the whole world to suffer a huge flood. According my research (teachers, TV, Internet) people hold one ...
9
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3answers
739 views

Sea Level Rise due to Climate Change

I've been trying to make sense of the argument surrounding sea level rise and not getting very far. Those who claim that Sea Level Rise is insignificant generally assert that we have been unable to ...
13
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3answers
4k views

How will sea level rise be distributed across the globe?

Sea level rise from melting glaciers will not be uniformly distributed across the globe. However, it isn't clear to me what places will have the most and least extreme changes in sea level rise. I ...
11
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3answers
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How long to melt all the polar ice?

The answers to this question say that the sea level will rise 66m if all the polar ice, etc, melts. How long will this take? Transporting incredible amounts of heat energy to the poles and injecting ...
9
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1answer
579 views

Does bathymetry affect ocean topography/height?

Here is a map of ocean surface height or topography: Source: http://www.esa.int/var/esa/storage/images/esa_multimedia/images/2010/12/mean_dynamic_topography_of_global_ocean/9930795-2-eng-GB/...
6
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2answers
3k views

What is the inverted barometer effect?

In a related question (Does bathymetry affect ocean topography/height?), the effect of atmospheric pressure on sea level is described as "inverted barometer". What does it mean? How does it get ...
18
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2answers
1k views

Historically, how has the fraction of Earth covered by water changed?

Today, 70.8% of the Earth is covered in water (± a few tenths of a percent depending on how you account for lakes).1 How has this figure changed over the history of the Earth, and why? Of course, if ...
16
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1answer
295 views

Potential explanations of Red Sea crossing

I am looking for a believable explanation of the Red Sea Crossing in the Bible. This would involve either strong winds(which is mentioned in the Bible) or plate tectonics which could cause land to ...
14
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1answer
319 views

Sea Level in Paleogeographic Maps

Most paleogeographic maps available (C. R. Scotese or R. Blakey maps for instance) show not only the shape of the continents during the concerned period but also the level of the seas and oceans (i. e....
8
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4answers
3k views

Are the oceans rising or the continents going down? How can we know?

The century old sustained rising of oceans, at a rate of 2-4 mm/y, remains a unexplained phenomenon; there is no correlation with temperature variations, so it is not due to the thermal variation of ...
7
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1answer
123 views

Dataset for expected sea level rise in case of massive meltdowns (Greenland/Antarctica)

Around the time climate change became a 'public issue' (let's say shortly after An inconvenient truth came out), figures started getting published about the expected (global) sea level rise in case of ...
7
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1answer
209 views

What definition of “seamount” is used by the largest utilised databases of seamounts?

Appears that answering what seamounts are is a non-trivial question. My take is what matters is data, since authoritative opinions on the topic are at best subjective. As such, my position is the ...
6
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1answer
179 views

Why do we measure eustatic sea-level from the center of earth?

Earth is rotating so it has a ellipsoidal shape. The measurement will therefore be different from equator and pole. So why do we measure eustatic sea-level from the center of earth?
6
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1answer
99 views

When sea level rises, does the increased ocean area cause the earth to cool down somewhat?

When the sea level rises, more of the planet's area is watery and less of it is land. Does this change in surface condition result in a change in global warming, such as a decrease in the net ...
3
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2answers
3k views

What is a seamount? [closed]

Per Oxford Dictionary of Earth Sciences: Seamounts are isolated, submarine mountain rising more than 1000m above the ocean floor. The sharp, crested summits of seamounts are usually 1000-2000m ...