future greenland melt

Discussion in 'Environment' started by Old Rocks, Aug 14, 2012.

  1. Old Rocks
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    Old Rocks Diamond Member

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    AGW Observer

    Ice surface melt area might cover whole Greenland ice sheet within decade

    Greenland ice sheet albedo feedback: thermodynamics and atmospheric drivers – Box et al. (2012) [FULL TEXT]

    Abstract: “Greenland ice sheet mass loss has accelerated in the past decade responding to combined glacier discharge and surface melt water runoff increases. During summer, absorbed solar energy, modulated at the surface primarily by albedo, is the dominant factor governing surface melt variability in the ablation area. Using satellite-derived surface albedo with calibrated regional climate modeled surface air temperature and surface downward solar irradiance, we determine the spatial dependence and quantitative impact of the ice sheet albedo feedback over 12 summer periods beginning in 2000. We find that, while albedo feedback defined by the change in net solar shortwave flux and temperature over time is positive over 97% of the ice sheet, when defined using paired annual anomalies, a second-order negative feedback is evident over 63% of the accumulation area. This negative feedback damps the accumulation area response to warming due to a positive correlation between snowfall and surface air temperature anomalies. Positive anomaly-gauged feedback concentrated in the ablation area accounts for more than half of the overall increase in melting when satellite-derived melt duration is used to define the timing when net shortwave flux is sunk into melting. Abnormally strong anticyclonic circulation, associated with a persistent summer North Atlantic Oscillation extreme since 2007, enabled three amplifying mechanisms to maximize the albedo feedback: (1) increased warm (south) air advection along the western ice sheet increased surface sensible heating that in turn enhanced snow grain metamorphic rates, further reducing albedo; (2) increased surface downward shortwave flux, leading to more surface heating and further albedo reduction; and (3) reduced snowfall rates sustained low albedo, maximizing surface solar heating, progressively lowering albedo over multiple years. The summer net infrared and solar radiation for the high elevation accumulation area approached positive values during this period. Thus, it is reasonable to expect 100% melt area over the ice sheet within another similar decade of warming.”

    Citation: Box, J. E., Fettweis, X., Stroeve, J. C., Tedesco, M., Hall, D. K., and Steffen, K.: Greenland ice sheet albedo feedback: thermodynamics and atmospheric drivers, The Cryosphere, 6, 821-839, doi:10.5194/tc-6-821-2012, 2012.
     
  2. polarbear
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    polarbear I eat morons

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    So why don`t you use your fridge and make a few ice cubes and bring`em to Canada or Greenland to make up for it, + the next time you freeze your ass off you can shove a few up your ass and enjoy the "back radiation"..according to your "science" it should work
     
  3. RollingThunder
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    RollingThunder Gold Member

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    Why don't you grow a brain?

    Oh right, you're too low on the evolutionary ladder to do that yet.

    Maybe someday when you amount to more than a pimple on a toad's butthole, you'll manage to scrape together a few brain cells and say something coherent but until then, your 'contributions' to this forum are worth less than a cup of moldy catpoop.
     
  4. skookerasbil
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    skookerasbil Gold Member

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    [​IMG]
     
  5. Old Rocks
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    Old Rocks Diamond Member

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    Bi-Polar
     
  6. Douger
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    Douger BANNED

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    You have to be. Both are disappearing making it a requirement to travel from one to the other on a seasonal basis ! :eusa_angel:
     

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