Ocean Bottom is Sinking

Discussion in 'Environmental Discussion' started by wjtracy, Jan 4, 2018.

  1. wjtracy

    wjtracy Senior Member

    Joined:
    Sep 19, 2006
    10,850
    3,331
    1
    Location:
    Northern VA (NoVA)
    Vehicle:
    2006 Prius
    The Bottom of the Ocean Is Sinking

    Interesting article suggesting that the incredible weight of melted water is causing the sea floor to sink, this explaining why we are not seeing as much sea level rise as expected due to climate change.

    I am not sure what the implications are, but for decades excess sea level rise has been expected. Virginia is aware of the flexibility of the crust because we are sinking due to ice age glacier rebound, thus we are still in some trouble in places like Norfolk, no matter what.
     
  2. Tideland Prius

    Tideland Prius Moderator of the North
    Staff Member

    Joined:
    Oct 2, 2004
    40,732
    12,298
    41
    Location:
    Canada
    Vehicle:
    2018 Prius Prime
    Model:
    Technology
    What would the implications be for those along fault lines if the floor is sinking? I assume it's not evenly sinking, sinking faster, perhaps over deeper sections?
     
  3. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    87,545
    38,969
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
  4. William Redoubt

    William Redoubt Senior Member

    Joined:
    Feb 13, 2016
    1,206
    1,140
    1
    Location:
    Coronado Island, California
    Vehicle:
    2016 Prius
    Model:
    Two
    What could possibly be the mechanism involved in this phenomenon? I doubt it's compression. So it must be displacement or deformation, which would make sense. Some parts sink as they are displaced by mass, while others rise, hence mountains.
     
  5. tochatihu

    tochatihu Senior Member

    Joined:
    Apr 10, 2004
    7,510
    2,813
    0
    Location:
    Kunming Yunnan China
    Vehicle:
    2001 Prius
    Such faith. No comment until I go through the GRL article.

    Other than, with oceans covering >70% Earth surface, how much downward force can come from a cm or few of water added on top? It would seem to imply that oceanic crust is rather sqooshy stuff. Meanwhile we recall that oceanic crust is denser than continental crust, latter being where thick deposits of (solid) water do indeed push downwards.
     
    bisco likes this.
  6. William Redoubt

    William Redoubt Senior Member

    Joined:
    Feb 13, 2016
    1,206
    1,140
    1
    Location:
    Coronado Island, California
    Vehicle:
    2016 Prius
    Model:
    Two
    You must understand, this is science! Your common sense approach vs. science? I mock you. You are no longer welcome on Coast to Coast AM.

    /sarcasm
     
  7. tochatihu

    tochatihu Senior Member

    Joined:
    Apr 10, 2004
    7,510
    2,813
    0
    Location:
    Kunming Yunnan China
    Vehicle:
    2001 Prius
    It was a joy in decades past to listen to that radio program on night time AM radio. I would not call it a shootout between science and common sense though.

    At present though I have to deal with being mocked by a fella with a lavender Prius. Or is it puce?
     
    Chodronish likes this.
  8. tochatihu

    tochatihu Senior Member

    Joined:
    Apr 10, 2004
    7,510
    2,813
    0
    Location:
    Kunming Yunnan China
    Vehicle:
    2001 Prius
    BTW article is Open Access. So you may graze freely.
     
  9. tochatihu

    tochatihu Senior Member

    Joined:
    Apr 10, 2004
    7,510
    2,813
    0
    Location:
    Kunming Yunnan China
    Vehicle:
    2001 Prius
    First this is a GRACE study with all strengths and weakness pertaining thereto.

    Second, the derived effect (oceanic crust depression) seems largest in Arctic and particularly around Greenland.

    For me it makes sense to think of interacting processes. Ice melts off Greenland (for example) that land has some rebound, and that has a converse effect on nearby oceanic crust.

    In no way do they appear to be advancing idea that a cm water added to top of ocean can sqoosh oceanic crust underneath.

    Anyway their SLR curves with this new factor added are very similar to priors. Except in Arctic.
     
  10. bwilson4web

    bwilson4web i3 and Prime

    Joined:
    Nov 25, 2005
    23,288
    13,118
    0
    Location:
    Huntsville AL with 2014 BMW i3-REx
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Plus
    I'm pretty sure rock is denser than water. As depth increases, the static pressure would be higher under the Rockies than an equivalent depth in the ocean. So far, ordinary matter under pressure compresses and become denser. Compressible is just relative.

    Bob Wilson
     
  11. tochatihu

    tochatihu Senior Member

    Joined:
    Apr 10, 2004
    7,510
    2,813
    0
    Location:
    Kunming Yunnan China
    Vehicle:
    2001 Prius
    rock is denser than water. Note that Redoubt toggled off sarcasm above.

    But yeah. Continental crust 2.7 oceanic crust 2.9. Those are broad averages and rocks of different types range from pumice (floaty) to, I do not know, 'native' gold?

    The whole Earth density is 5.5; dominated by iron (7.9) core

    ==
    Was it the Livescience take on this that asserted water pushdown, or did I just imagine it?
     
  12. padroo

    padroo Senior Member

    Joined:
    Jan 11, 2008
    2,763
    2,224
    13
    Location:
    Chesterton, Indiana Another third world country.
    Vehicle:
    2016 Prius
    Model:
    Four
    I must be on the wrong channel. Lol
     
  13. tochatihu

    tochatihu Senior Member

    Joined:
    Apr 10, 2004
    7,510
    2,813
    0
    Location:
    Kunming Yunnan China
    Vehicle:
    2001 Prius
    We can make this channel suit you better, if you say how...
     
  14. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    87,545
    38,969
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    clicker must be broken...
     
  15. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    39,348
    27,984
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    I figured you might be powerless and buried in snow/ice.
     
Loading...