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  • OT. Days getting longer.. ???

    From jim whitby@21:1/5 to All on Tue Jul 16 11:01:31 2024
    Rising sea levels caused by climate change are making the Earth "fatter"
    at the equator - slowing down its rotation and making the days longer.

    <https://e3.365dm.com/23/02/1920x1080/skynews-planet-earth- sun_6072574.jpg?20230228074839>

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  • From john larkin @21:1/5 to [email protected] on Tue Jul 16 07:07:34 2024
    On Tue, 16 Jul 2024 11:01:31 -0000 (UTC), jim whitby
    <[email protected]> wrote:


    Rising sea levels caused by climate change are making the Earth "fatter"
    at the equator - slowing down its rotation and making the days longer.

    <https://e3.365dm.com/23/02/1920x1080/skynews-planet-earth- >sun_6072574.jpg?20230228074839>

    Since 1900, elevators have allowed cities to build high-rise
    buildings, which has slowed down earth's rotation too.

    High-voltage transmission lines, too.

    Satellite launches slow earth's rotation. And mining and oil wells.

    But sinking ships speed it up.

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  • From Jeroen Belleman@21:1/5 to jim whitby on Tue Jul 16 16:18:57 2024
    On 7/16/24 13:01, jim whitby wrote:

    Rising sea levels caused by climate change are making the Earth "fatter"
    at the equator - slowing down its rotation and making the days longer.

    <https://e3.365dm.com/23/02/1920x1080/skynews-planet-earth- sun_6072574.jpg?20230228074839>


    Oh swell! So we can measure the rise in sea level by measuring
    the length of the day. Data, anyone?

    Is that planet earth picture an AI product? With the sun in
    the background, we should have been looking at the night side.
    Not very I, this AI.

    Jeroen Belleman

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  • From john larkin @21:1/5 to [email protected] on Tue Jul 16 08:32:03 2024
    On Tue, 16 Jul 2024 16:18:57 +0200, Jeroen Belleman
    <[email protected]> wrote:

    On 7/16/24 13:01, jim whitby wrote:

    Rising sea levels caused by climate change are making the Earth "fatter"
    at the equator - slowing down its rotation and making the days longer.

    <https://e3.365dm.com/23/02/1920x1080/skynews-planet-earth-
    sun_6072574.jpg?20230228074839>


    Oh swell! So we can measure the rise in sea level by measuring
    the length of the day. Data, anyone?

    Is that planet earth picture an AI product? With the sun in
    the background, we should have been looking at the night side.
    Not very I, this AI.

    Jeroen Belleman

    Various unrealistic online pictures, edited or fake, should be
    identified by law.

    --- SoupGate-Win32 v1.05
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  • From Martin Brown@21:1/5 to Jeroen Belleman on Tue Jul 16 17:22:15 2024
    On 16/07/2024 15:18, Jeroen Belleman wrote:
    On 7/16/24 13:01, jim whitby wrote:

    Rising sea levels caused by climate change are making the Earth "fatter"
    at the equator - slowing down its rotation and making the days longer.

    It is pretty much uniformly distributed over the Earth's surface.

    <https://e3.365dm.com/23/02/1920x1080/skynews-planet-earth-
    sun_6072574.jpg?20230228074839>

    Oh swell! So we can measure the rise in sea level by measuring
    the length of the day. Data, anyone?

    It is real - inferred from VLBI data. It is sensitive enough to detect
    seasonal variations in the northern hemisphere summer (and has been for
    quite a while). The asymmetry of land masses north and south of the
    equator. When trees are in leaf in US Canada Russia forests the Earth's
    moment of inertia is increased by the weight of sap and leaves.

    https://www.researchgate.net/publication/261039439_On_the_length_of_day_with_2008-2010_VLBI_observations

    Fairly recent example of such data above. This is the current global
    solution from the Paris Observatory (seasonally detrended).

    https://ivsopar.obspm.fr/24h/index.html

    Most of the slowdown comes from tidal drag from sun and moon. Some
    changes are a result of oceanic currents shifting around too.

    Effects of glaciers melting can go either way depending on what altitude
    the ice in the glacier was at (many glaciers are at high altitudes).

    --
    Martin Brown

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  • From Jeroen Belleman@21:1/5 to Martin Brown on Tue Jul 16 19:46:41 2024
    On 7/16/24 18:22, Martin Brown wrote:
    On 16/07/2024 15:18, Jeroen Belleman wrote:
    On 7/16/24 13:01, jim whitby wrote:

    Rising sea levels caused by climate change are making the Earth "fatter" >>> at the equator - slowing down its rotation and making the days longer.

    It is pretty much uniformly distributed over the Earth's surface.

    <https://e3.365dm.com/23/02/1920x1080/skynews-planet-earth-
    sun_6072574.jpg?20230228074839>

    Oh swell! So we can measure the rise in sea level by measuring
    the length of the day. Data, anyone?

    It is real - inferred from VLBI data. It is sensitive enough to detect seasonal variations in the northern hemisphere summer (and has been for
    quite a while). The asymmetry of land masses north and south of the
    equator. When trees are in leaf in US Canada Russia forests the Earth's moment of inertia is increased by the weight of sap and leaves.

    https://www.researchgate.net/publication/261039439_On_the_length_of_day_with_2008-2010_VLBI_observations

    Fairly recent example of such data above. This is the current global
    solution from the Paris Observatory (seasonally detrended).

    https://ivsopar.obspm.fr/24h/index.html

    Most of the slowdown comes from tidal drag from sun and moon. Some
    changes are a result of oceanic currents shifting around too.

    Effects of glaciers melting can go either way depending on what altitude
    the ice in the glacier was at (many glaciers are at high altitudes).


    Thank you for these references. Interesting. I was momentarily confused
    by some of the French site's polar motion graphs labelled in 'as'. I
    gather those are arcseconds, not attoseconds. ;-)

    I see that LOD is far more involved than the OP implied. Getting an undisputable sea level signal from LOD data is not going to be clear
    cut.

    Everyone appears to be worrying about phenomena deeply buried in
    noise these days,

    Jeroen Belleman

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