Questions tagged [sea-level]

Questions regarding the height of the ocean's surface.

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36
votes
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 ...
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 ...
22
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2answers
7k views

“Five of the Solomon Islands disappeared” due to sea level rise, how is this possible so quickly?

The text of the introduction to the BBC Podcast Sea Levels Rise; The Compass, Living on the Edge Episode 1 of 4 says: Five of the Solomon Islands have disappeared, many more are becoming ...
22
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1answer
2k views

How can the world's sea level rise and fall simultaneously?

I have just been reading this article on Gizmodo (known for its hard science I know), that talks about sea level rising by up to 3 feet(!). In the article and video, created from information from ...
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 ...
18
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2answers
734 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 ...
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 ...
18
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1answer
149 views

Paleogene transantarctic seaway

Lawver & Gahagan (1998; 2003) hypothesized, based on sea level records and the isostatically adjusted bedrock surface of Antarctica, the existence of a Trans-Antarctic Seaway linking the Ross Sea ...
17
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1answer
1k views

What influences tide-height the most? Can I guess the height by looking on a globe?

I hope that the question title is resonably clear: What are the most significant factors which influence the tide height? I'm aware of the following couple of them: Sun-Earth-Moon relative position (...
17
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1answer
160 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 ...
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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2answers
3k views

Why doesn't sea level show seasonality?

North-hemisphere ice-shelf melts on summer and grows on winter. I would expect appreciable changes on sea-level between seasons, but sea-level looks equal on winter than on summer. Why doesn't sea ...
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.
14
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1answer
324 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....
14
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2answers
542 views

Could the Dead Sea dry up? and if so, when?

According to recent findings, during the last interglacial period, about 120,000 years ago, the precursor of the Dead Sea (Lake Lisan) dried up perhaps entirely. Today, the Dead Sea level is dropping ...
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 ...
13
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1answer
174 views

How much of the underwater land masses within the arctic ocean is considered continental shelf?

Right now I'm in the middle of writing my master thesis which is about modelling the ocean bottom pressure (obp) under areas with sea-ice coverage. In most Oceanic General Circulation Model's (ogcm) ...
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?
12
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1answer
272 views

Where does the biggest land-based ice cap reside?

I'm thinking biggest in volume, regarding which area of the planet will contribute more to a raising in sea level - were the ice in those regions to melt. I can basically think of to candidates, ...
11
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3answers
4k views

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 ...
11
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2answers
288 views

Can rocks have pressure signatures?

Since rocks can have magnetic signatures, as is the case with paleomagnetism, can they store past pressures also? For example, when researchers are trying to determine past ocean levels, they ...
11
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1answer
589 views

What is a reasonable forecast of sea level in 2100?

The IPCC 2013 Physical Science Basis Report says 0.4m - 0.6m. That is somewhat dated and now http://www.atmos-chem-phys-discuss.net/15/20059/2015/acpd-15-20059-2015.html seem to have contested it. ...
10
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3answers
1k views

Will increased precipitation in Antarctica prevent sea level rise?

It has been suggested that global warming will lead to increased precipitation in parts of Antarctica. This would sequester water in the ice sheet, preventing sea level rise. However, the slope (and ...
10
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2answers
120 views

Is there any link between sea-water inflitration into groundwater and nitrate?

I recently read a pop-science article about sea-water infilitration into (sweet) groundwater. One specific instance mentioned was the gaza strip: Exzessive well building and drawing of groundwater ...
10
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1answer
231 views

What is the potential impact of hurricane intensification and sea level rise on coastal flooding?

Climate change has the potential to increase flooding by hurricane intensification (magnitude and intensity) and by sea level rise. Many communities around the world are already exposed to coastal ...
9
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2answers
3k views

What happens to sea level when a ship sinks?

Let's assume that a ship is traveling on the ocean and it sinks, what is the effect on the sea level? Even if the effect is small, would it go up, down or remain the same?
9
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3answers
369 views

How is sea level measured?

In comments on Earth changes due to global climate change, sea level changes is a common topic. I hear quotes about sea level changes in the centimeter and even millimeter range and wonder how such ...
9
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3answers
759 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 ...
9
votes
2answers
232 views

How was Venice flooded?

If I understand this correctly, Venice was not flooded due to sudden rainfall causing rivers to overflow, but due to the high tides. These high tides were caused by an alignment of sun, which was ...
9
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1answer
587 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/...
9
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1answer
297 views

Is altitude of everything decreasing due to sea level rise?

We know that sea level is rising, though some people say climate change is fake. Altitude is defined as the height of something measured from sea level. Since sea level is increasing, and the ...
8
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2answers
1k views

How much does sea level rise due to sediment deposition?

There has been a lot of noise in the news in the last few days because Congressman Mo Brooks from Alabama claimed that erosion played a role in rising sea levels. Quoting from Science magazine: ...
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 ...
8
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2answers
736 views

Sea Surface Height Data

Is there a good dataset on global ocean sea surface height? I found this, http://climate.nasa.gov/interactives/sea_level_viewer, but there is no data I can download and it's hard to see the latitude ...
8
votes
1answer
911 views

What is the effect of rising sea level on measurements of elevation?

If the earth's mean sea level rises, I assume that requires humans to adjust current measurements of elevation? For example, Mt Everest would no longer be 8,848 metres above sea level. Is there a more ...
8
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2answers
952 views

How to measure elevation above sea level

Elevation is often measured in terms of "[unit of length] above sea level." Considering that the oceans aren't a uniform height, how is this measured?
7
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1answer
210 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 ...
7
votes
1answer
126 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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3answers
1k views

How were the sea levels around western Europe during the Medieval Warm Period?

The Medieval Warm Period (MWP) or Medieval Climatic Anomaly was a time from about 950 to 1250 when climate was warmer than in the timespans immediately before and after. My question is if this ...
7
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0answers
63 views

How much does ocean cover percentage change between glacial periods? [duplicate]

Currently, oceans cover about 71% of the total area of Earth. Ice ages can cause this figure to fluctuate, by lowering the sea level and creating land bridges and other features. How much can this ...
6
votes
2answers
724 views

Water levels: What does “mBf” mean?

I have seen the term MBf used in a couple of places (a ramp specification and a Hydrological Study) to describe height or depth of water. What is this unit? Can it be converted to meters? For bonus ...
6
votes
2answers
315 views

Have there ever been any islands that disappeared due to rising sea level?

With global warming comes rising sea levels. This has been going on for at least fifty years. So haven't there been some islands that have been swallowed by now? An island could be nothing more than ...
6
votes
1answer
265 views

Coral growth keeping up with sea level rise?

On 11 sep 2016, the Australian Herald Sun placed an opinion piece by Andrew Bolt titled Drowning in cash: Pacific islands love this scare* about the $300 million** financial aid pledged by the ...
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 ...
6
votes
1answer
101 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 ...
6
votes
1answer
184 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
votes
1answer
305 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 ...
6
votes
2answers
1k views

How far upstream would severe sea level rise (1m) noticably affect a large river?

The projection for sea level rise due to global warming seem to hover about 1m by 2100, let's use this figure. How far upstream would this noticably affect a large river, e.g. the Rhine? I think it ...
5
votes
2answers
3k views

How would Earth map look like if all ice melts?

Is there somewhere a map which indicates which areas and cities become sea?