Questions tagged [sea-level]

Questions regarding the height of the ocean's surface.

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Is there a geological explanation for the recent Mammoth tusk discovery 185 miles off the California coast?

A recently publicized discovery of a Columbian Mammoth tusk located well of the coast of California in quite deep water made me wonder if geological conditions 100,000 years ago can explain how it got ...
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After global warming, does an ice age occur because the polar caps have melted and caused more water to absorb the gloabl warming

Is there a le Chatilier principle within Earth - Earth heats up causes global warming resulting in polar ice melt resulting in higher sea levels which takes up the extra earth temp and the over ...
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2 votes
1 answer
259 views

Would freezing the ocean and storing the ice in the poles reduce effects of climate change or sea level?

Disclaimer I've read this question already on sending water to the north pole, south pole and glaciers, and I thought I'd give it my own take and see how technically possible it could be. Question As ...
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If we send ocean waters into glacier of north pole/south pole to reduce sea level, will it help global warming?

this is my first time posting in Earth Science, please be gentle to me. I am Science Enthusiast, though numbers are my enemies for now so I can't come up with formulas or any form of calculations. ...
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Why are the south, the west and the north of the Caspian sea lush but its east completely dry?

About the Caspian sea area today: The south is very lush with the subtropical forests of the Iranian provinces of Gilan, Mazandaran and Golestan (although less "tropical" in Golestan) The ...
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3 votes
1 answer
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Was Zealandia above water during the last Ice age?

Was Zealandia above sea level during the last ice age? Like how Sahul or Sundaland were?
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It is possible to reduce global sea level via filling empty lowlands with ocean water? [duplicate]

There are empty lowlands in Australia and Iran like Dasht-e Lut. If we fill these lands with ocean water then could we reduce the global sea level and save coastal cities like venice?
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0 votes
2 answers
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Are marine fossils in the mountain happens due to lower sea levels?

https://9gag.com/gag/aBme0M2 This one says it is I am not sure whether to ask this in geology or biology. How does marine fossils show up in mountains?
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4 votes
1 answer
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How far would average sea level rise from a 25% increase in total ocean volume?

What amount of average sea level rise (in meters above 2020 levels) would be associated with a 25% increase in total ocean volume? The reason I ask is because of this study that indicates Earth has ...
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4 votes
3 answers
125 views

Did we ever record a reduction in sea level when the Panama canal was constructed?

Are any instruments today or at the time of the creation of the Panama canal capable of detecting a reduction in sea level from the creation of it? Given the size of the canal in comparison to the ...
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Why is the creation of water from the combustion of hydrocarbons not listed as a cause for rising sea levels?

https://iopscience.iop.org/article/10.1088/1748-9326/aa8390 According to this paper, water is created by burning hydrocarbon fuels. It seems like a major thing to exclude from "reasons the sea ...
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1 vote
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The seemingly impossible formation time for the local sea arches and caves

I live in Hong Kong. As a nature lover, I often spend time visiting the south-eastern coasts of Sai Kung Peninsular - a local nature reserve. The area's famous feature is the coastal erosion landscape....
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2 votes
1 answer
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Is there any animation to demonstrate if the sea level rise up?

I found a very cool video here: Draining Earth's oceans, revealing the two-thirds of Earth's surface we don't get to see https://www.youtube.com/watch?v=-uOwv_Krqk8&feature=emb_logo However, I ...
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1 vote
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What will the sea level be when the ice caps/glaciers melt? [duplicate]

I have my views and you have yours, so I ask a question, what was the average sea level in Athens, Greece 2,720 years ago? What was the average sea level in ancient Rome 2,420 years ago? https://en....
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3 votes
2 answers
343 views

Does Earth's rotation cause sea levels to increase from east to west?

Intuitively if the Earth were to rotate fast enough from west to east, the average sea level would be noticeably higher on the west edge of the oceans. Does Earth's rotation cause this effect in ...
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Mass budget of coastal erosion and ocean deposion

This question made me wonder: how much mass (or volume) of material is eroded by the sea each year? Of this mass, how much is deposited in the oceans? (As Michael pointed out in his answer, part of ...
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3 votes
2 answers
605 views

Is sea erosion the opposite of sea level rising (or rather, an adjacent phenomenon)?

Because I understand the mechanism of sea erosion as to take earth away from shorelines (and scatter it deep into the sea floor) and also to derive from climate crisis, I ask the following question: ...
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6 votes
1 answer
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What Caused The Sea Levels to Drop During the Maastrichtian Epoch?

Anyone who has studied ice ages would know that during the last two-and-a-half million years of Earth's history, there have been periods where there was enough ice to suck up a lot of water. As a ...
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5 votes
1 answer
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Global areas below sea level dataset?

Anyone know of an existing dataset of areas below sea level? Vector extents would be ideal. Doesn't need to be super detailed for my purposes, but it would be good if it included all areas (e.g. over-...
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Could pumping ocean water into desert areas help reduce sea level rise?

I have been reading the discussion about pumping sea water into the desert for purposes of irrigation and changing the dry climate of that area, but what about to just purely offset the rising sea ...
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4 votes
1 answer
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History of the Arctic Ocean

Much of the Arctic Ocean is fairly shallow compared to other oceans. There must have been times in the past during severe ice ages that a lot of what is now the ocean bed was above sea level. When was ...
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0 votes
1 answer
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Migration Routes for Animals from Asia to America [closed]

The jaguar is a close relative of the Asiatic leopard and must have had a common ancestor within the last 5 million years. The South American tapir is obviously closely related to the Malayan tapir ...
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5 votes
3 answers
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Are we experiencing lower level of gravity now compared to past?

Whole civilizations have been buried underground and we have built new landscapes over them. The fact that tall buildings and houses are being excavated from under the ground means that we are living ...
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Are there models of mortality due to sea level increases (via climate change)?

In a self-answer of mine on Skeptics, one of the comments rightly pointed out that the model in question (from Impact Lab) does not explicitly account for mortality due to sea level changes. Are there ...
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Regional and Relative Sea level

I am a little confused by the terms "regional" and "relative" in the sea level change context. Do the two words have the same meaning? Does the "regional MSL trend" in https://www.aviso.altimetry.fr/...
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15 votes
2 answers
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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 ...
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2 votes
1 answer
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What is the effect of sea-level changes on the extent of the Earth's atmosphere?

If sea-levels rise, does the Earth's atmosphere extend to the same distance out to space, with the pressure increasing, or does it expand? If sea levels rose 10m, how much change would there be to ...
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4 votes
1 answer
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Understood cause of sea level rise between 1850 and 1950

This question is based on the following graph from a 2018 report by J. Curry. (I haven't found any peer-review of the report itself so I can't vouch for the validity of its claims, but that's not the ...
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1 vote
0 answers
50 views

Topography and flash flooding

I'm looking for a study or document showing the effect of the topography, slopes, the sea level and the tide on flash flooding occurrence. Thanks in advance
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6 votes
1 answer
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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 ...
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4 votes
1 answer
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Waterlevel increase calculation

So I tried to calculate the rise of waterlevel myself. But the results I have gotten seem to be pretty low: Given the earths radius, I clalculated different Events: 1) If all landice melts there is ...
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38 votes
6 answers
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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 ...
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7 votes
1 answer
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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 ...
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9 votes
2 answers
282 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 ...
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9 votes
3 answers
559 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 ...
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4 votes
1 answer
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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 ...
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5 votes
2 answers
5k views

How would Earth map look like if all ice melts?

Is there somewhere a map which indicates which areas and cities become sea?
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3 votes
1 answer
261 views

What was the percentage of land mass in prehistoric times when temperatures were high enough that we had no ice caps?

I grew curious after watching a presentation about the large creatures of prehistoric times. One of the theories cited about why creatures were so big was the increased oxygen in the atmosphere due to ...
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4 votes
0 answers
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How much ocean water is currently being displaced by ships?

According to Statista, as of January 2017, there are approximately 52,000 ships currently operating in the merchant fleet and 11,000 of these are considered bulk carriers. How many ships are there ...
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4 votes
1 answer
108 views

Do ocean level rise estimates account for mantle elasticity and plate mass changes?

In the mainstream media the problem of ocean level rise is presented rather... over-simplistically - ice melts -> more water flows into the oceans -> water level rises -> continents sink. But it is ...
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10 votes
1 answer
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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: ...
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22 votes
2 answers
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"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 ...
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9 votes
1 answer
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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 ...
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2 votes
2 answers
892 views

Estimated volume, daily or annually, of sea level rise due to melting ice?

Its a big number, difficult to estimate I assume. But is there a peer reviewed estimation (at current conditions) of the volume of daily or annual increase of water?
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5 votes
2 answers
723 views

estimation of prehistoric sea levels

From what reference point/level are prehistorical (e.g., Precambrian era) sea levels estimated? As I understand things, the following are true: Since the formation of continents, land elevations ...
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2 votes
2 answers
648 views

Was the Earth's sea-level significantly lower in ancient times?

A lot of times, ancient artifacts or even whole ancient civilizations are found buried very deep into the ground surface of the earth. Entire civilizations that had high buildings have been found ...
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1 vote
1 answer
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Approximation of ancient landmasses using current ocean floor data

I am wondering how accurate such an approximation would be. I wish to take a current height map of the earth (including the ocean floor) and approximate the form of ancient landmasses by changing the ...
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1 vote
2 answers
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Data sets for historical sea level estimates

I am looking for data sets for historical global sea level estimates. How would I go about doing this the best way? Are there any publicly available resources for this? The timespan I am looking at ...
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15 votes
3 answers
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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 ...
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Hypothetically, would digging a big trench from the ocean and flooding desert areas be a bad solution to combatting sea level rise? [duplicate]

My question is basically the title. Ignoring most of the feasibility of the enormous engineering and earthmoving requirements (I guess I mean to say, given an unlimited budget) in very hot areas, ...
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