rising sea levels question

Discussion in 'science, nature and environment' started by Pickman's model, May 29, 2018.

  1. Pickman's model

    Pickman's model Every man and every woman is a star

    when scientists and commentators talk about rising sea levels, are the diminishing areas of remaining land factored in - that is, is the greater area of sea taken into account?
     
  2. TruXta

    TruXta tired

    Not a scientist, but I can't imagine what else than land you'd measure sea levels against.
     
  3. Pickman's model

    Pickman's model Every man and every woman is a star

    you'd hope so anyway
     
  4. Limejuice

    Limejuice Well-Known Member

    Unless every inch of coastline everywhere dropped vertically into the ocean like the Cliffs of Moher, a rising sea level must reduce the surface area of the dry stuff, on account of slopes. That's logical, right?

    I may well have misunderstood the question.

    :)
     
  5. Pickman's model

    Pickman's model Every man and every woman is a star

    No, that's exactly what I meant
     
  6. TruXta

    TruXta tired

    No matter the question of what it's measured against, global sea level is an average or similar measure, as sea levels are constantly changing due to atmospheric and gravitational effects.

    Which probably complicates OPs question somewhat.
     
    Pickman's model likes this.
  7. CNT36

    CNT36 Not carbon nano tubes

    Everything I've read suggests yes. It seems to be a measure of something akin to depth rather than volume.
     
  8. kebabking

    kebabking Unfettered ambition

    I've definitely seen maps with different projected increments of sea level rise - the one I saw recently had blue where Somerset, eastern Norfolk, Essex, London, Lincolnshire and a sizable streak of Gloucestershire used to be.

    Is that what you mean?
     
    Pickman's model likes this.
  9. 2hats

    2hats

    Sea level is a linear measurement, not an areal one. Mean sea level follows the equipotential contour lines of the Earth’s geoid, which accounts for the influences of the planet’s gravity and rotation (alone).

    The bulk of the change in sea level is due to thermal expansion of water, with a somewhat lesser contribution from meltwaters. Over the century up to the 1980’s this rise has averaged just under 2mm per year. In the last 25 years that rise appears to have nudged up to almost 3mm per year on average.
    [​IMG]

    Obviously the area of sea/land is partly connected topographically to sea level, but in a complicated, non-linear manner. Sea level alone is a more useful direct measurement of what is going on as there is a complex combination of on-going erosion and and accretion events, both natural and man-made, changing the total land/water surface area. Indeed, over the last 30 years, satellite studies indicate that some 58000 sq km of land has actually been gained. Loss of land (thus far) due to static sea level rise alone isn’t as large as you might think.
    [​IMG]
    (Blue=water area gained, Green=land area gained, over the period 1985-2015).
     
    elmpp and Pickman's model like this.
  10. Pickman's model

    Pickman's model Every man and every woman is a star

    Yes
     
  11. Ponyutd

    Ponyutd Greebo likes this....r.i.p.

  12. Pickman's model

    Pickman's model Every man and every woman is a star

    Yeh saw something about sandmining a while back, another fucking disaster

    :mad:
     
    sealion and Ponyutd like this.
  13. Yossarian

    Yossarian free shrugs

    I was surprised to find out that the shortage has gotten so bad that "sand bandits" are wiping out entire islands - apparently the stuff in deserts is no good because it's too fine and rounded for use in construction..
     
  14. Pickman's model

    Pickman's model Every man and every woman is a star

    You should let your name be put forward for poster of the year
     
    CNT36, elmpp and sealion like this.

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