To notice something is going on with the world's ice sheets, you could measure
melting water runoff, glacier retreat or use satellites and GPS to measure ice volume decline.
Melt water runoff from a melting of the Greenland Ice Sheet is a potentially major source of freshening not yet included in the models found in the MMD (see Section 8.7.2.2).
Not exact matches
To catch the
runoff from the
melted snow, residents had wisely built a damn, but it was inefficient, providing
water for only a few dozen families, and stirring up strife between neighbors desperate for its live - saving
waters.
The thickness of the remaining, multi-year ice, along with its geographic location, will make it more difficult to
melt than the ice that was spread across the Arctic, and exposed to Pacific and Atlantic ocean currents, along with
runoff from fresh
water rivers.
Which leads me to another question — the
melting glacial / Greenland / Antarctic ice
water is depleted in CO2 (check out the bubbles in your ice cubes)-- how much additional CO2 is being sequestered by this
runoff into the oceans, and what happens to CO2 increase when we run out of glaciers?
Pacific
water, ice -
melt, precipitation and river
runoff are distinct sources of freshwater to the Canada Basin.
Runoff from steep ice - cliffs, or through subglacial flow driven by
water percolating through pores or fractures, will convert a high fraction of
melting into ablation.
I believe India, Pakistan, Kashmir, Nepal, China will feel the full effect of lost glacier
melt runoff that feeds major rivers in their part of the world and provide irrigation and drinking
water for tens of millions of people.
Finally, if the North American hydrologic cycle is enhanced, and / or Greenland's southern ice caps
melt, the increased fresh
water runoff from land areas could dilute the ocean surface
water and critically reduce its salinity.
Because a large share of the
runoff in the glacial
water systems comes from
melting, most of this
runoff, up to 80 %, takes place in the summer.
A continuing trend in glacier loss will seriously decrease the
water reserves stored as ice, reducing
melt season
runoff.
The combination of snow
melt, glacial
melt and rainfall
water sources provides for reliable
runoff in these basins.
More than half of the world's population relies on
water that originates in mountains, coming from rainfall
runoff or ice
melt.
The effect is measurable: for example, reduced
runoff from snow
melt has caused an annual 5 percent decrease in the amount of
water entering the Colorado River, which experts say already faces the risk of significantly drying up.
Alternating patches of forest and meadow attenuate snow
melt and
runoff, helping to regulate the mountain
water cycle.
Losses from surface
melting,
water runoff, the breakup of glaciers into the ocean (calving), and the transformation of solid ice into
water vapor (sublimation) exceed any gains through snowfall.2, 3,4,5 The Greenland ice sheet loses most of its mass on the perimeter, through a dozen fast - moving glaciers, including Helheim.5, 6
The Greenland ice sheet is shrinking.2, 3,4,5 Ice sheets grow through snowfall, and shrink through surface
melting,
water runoff, breakup into the ocean (calving), and direct transformation into
water vapor (sublimation).
Volcanism triggered by deglacial unloading may plausibly accelerate
melting and
water runoff through an albedo effect of dark tephra on snow and ice.
Temperature directly influences mountain snow pack, which provides natural storage of precipitation during cold winter months until it
melts and provides
water in the form of
runoff as temperatures warm.
Ice - sheet volume is controlled by the balance between mass input and mass loss; mass input is almost entirely due to snowfall, and mass loss is from iceberg calving supplied by flow of the ice sheet, or
runoff of
melt water.
Several physical variables and biological processes drive this variability in pH, including temperature, salinity, upwelling,
water currents, river
runoff, sea ice
melt, photosynthesis, respiration, calcification and dissolution.
In turn, the amount of snow - and ice
melt influences
runoff into lowland rivers and the amounts of
water recharging river - fed aquifers.
Within the Indus basin, reduced
melt water will have significant impacts upon available
runoff; however, increased uncertainties surrounding precipitation and socioeconomic changes limit any conclusive assessment of how
water availability will be affected; moreover, seasonality of
runoff may be a more important factor.
The thickness of the remaining, multi-year ice, along with its geographic location, will make it more difficult to
melt than the ice that was spread across the Arctic, and exposed to Pacific and Atlantic ocean currents, along with
runoff from fresh
water rivers.
It's been known for many years that the surface
waters of Arctic Ocean are freshened by
melting sea - ice and
runoff from rivers.
These OMITTED / POORLY Represented processes include the following: oceanic eddies, tides, fronts, buoyancy - driven coastal and boundary currents, cold halocline, dense
water plumes and convection, double diffusion, surface / bottom mixed layer, sea ice — thickness distribution, concentration, deformation, drift and export, fast ice, snow cover,
melt ponds and surface albedo, atmospheric loading, clouds and fronts, ice sheets / caps and mountain glaciers, permafrost, river
runoff, and air — sea ice — land interactions and coupling.
More
melting snow and earlier
runoff will mean too much
water during the first months of the year and not enough later, especially during the summer months when it would be most needed.