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London Bicycle Messenger Association: Drop in temperature while cycling thru regent's park

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      CommentAuthorqueenbinky
    • CommentTimeApr 18th 2011
     
    Hello
    I wondered if any other London cyclists experience the discernable drop in temperature when cycling from Marylebone Road to the Outer Circle via Park Square Gardens and does anyone know why it happens?
    thanks
  2.  
    Less thermal energy being generated or more thermal energy being absorbed in that area perhaps? Or something to do with wind currents and heat being carried away by convection?
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      CommentAuthorev
    • CommentTimeApr 18th 2011 edited
     
    I've never noticed anything, but probably wouldn't if there was anything to notice. Marylebone Road is one of the most polluted roads in Europe so it's possible that moving from chugging on fumes to the more breezy Outer Circle is behind it.

    Then again, it could all be in your head (like the best things in life).
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      CommentAuthorBuffalo Bill
    • CommentTimeApr 19th 2011 edited
     
    This is likely to be a highly localised 'urban heat island' effect. http://en.wikipedia.org/wiki/Urban_heat_island

    I also notice the same thing going past Abney Cemetery on Stamford Hill, and going past Clissold Park.

    In summer, most especially when the sun has been out all day heating up the concrete & tarmac, this effect is particularly noticeable.
  5.  
    "The main cause of the urban heat island is modification of the land surface by urban development which uses materials which effectively retain heat. Waste heat generated by energy usage is a secondary contributor. "

    So... perhaps grass reflecting a lot of infra red energy, vs. tarmac absorbing and then releasing it.
  6.  
    Water evaporating from the soil & from plants carries away energy too

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