Not exact matches
Although CryoSat - 2 is designed to measure
changes in the
ice sheet elevation, these can be translated into horizontal motion at the grounding line using knowledge of the glacier and sea floor geometry and the Archimedes principle of buoyancy — which
relates the thickness of floating
ice to the height of its surface.
«New method
relates Greenland
ice sheet changes to sea - level rise.»
«They were questions about how
ice sheets relate to sea level,
changes in the ocean,
changes in the atmosphere and also
changes in weather and long - term climate patterns,» says Dr Kennicutt.
The latter is almost linearly
related to
changes in
ice sheet volume; the former, however, is influenced by a range of factors, including atmosphere / ocean dynamics and
changes in Earth's gravitational field, rotation, and crustal and the mantle deformation associated with the redistribution of mass between land
ice and the ocean.
Most geologic sea level
changes are
related to tectonic processes (rates of ocean spreading, continental subduction etc.) or the waxing and waning of
ice sheets (particularly over the last 2.5 million years).
This result would be strongly dependent on the exact dynamic response of the Greenland
ice sheet to surface meltwater, which is modeled poorly in todays global models.Yes human influence on the climate is real and we might even now be able to document
changes in the behavior of weather phenomena
related to disasters (e.g., Emanuel 2005), but we certainly haven't yet seen it in the impact record (i.e., economic losses) of extreme events.
On decadal and longer time scales, global mean sea level
change results from two major processes, mostly
related to recent climate
change, that alter the volume of water in the global ocean: i) thermal expansion (Section 5.5.3), and ii) the exchange of water between oceans and other reservoirs (glaciers and
ice caps,
ice sheets, other land water reservoirs - including through anthropogenic
change in land hydrology, and the atmosphere; Section 5.5.5).
Although CryoSat - 2 is designed to measure
changes in the
ice sheet elevation, these can be translated into horizontal motion at the grounding line using knowledge of the glacier and sea floor geometry and the Archimedes principle of buoyancy — which
relates the thickness of floating
ice to the height of its surface.
The
ice ages appear to
relate to a
change in that
ice sheet driven by variations in the earth's orbit.
The Quaternary glacial history of the Arctic Ocean is characterized by the repeated build - up and decay of circum - Arctic
ice sheets on the continental shelves, the development and disintegration of
ice shelves, and
related changes in ocean - circulation patterns and sea
ice cover50, 51,52,53,54,55.
Sea level rise (due to thermal expansion only — the
ice sheet component of the model isn't yet fully implemented) is directly
related to temperature, but
changes extremely slowly.
Breaking
ice sheets, evaporating lakes and other phenomena
relating to Earth's
changing climate have influenced the patterns of these rugs by Brooklyn artist Fernando Mastrangelo.
RELATED: Home Impacts of Global Warming Government: The View from Washington, DC The Modern Temperature Trend Rapid Climate
Change Supplements: Wintry Doom
Ice Sheets & Rising Seas
The observed effects of cryosphere reduction include modification of river regimes due to enhanced glacial melt, snowmelt advance and enhanced winter base flow; formation of thermokarst terrain and disappearance of surface lakes in thawing permafrost; decrease in potential travel days of vehicles over frozen roads in the Arctic; enhanced potential for glacier hazards and slope instability due to mechanical weakening driven by
ice and permafrost melting; regional ocean freshening; sea - level rise due to glacier and
ice sheet shrinkage; biotic colonisation and faunal
changes in deglaciated terrain;
changes in freshwater and marine ecosystems affected by lake -
ice and sea -
ice reduction;
changes in livelihoods; reduced tourism activities
related to skiing,
ice climbing and scenic activities in cryospheric areas affected by degradation; and increased ease of ship transportation in the Arctic.
Furthermore, because the regression is being defined over
ice age cycles where the biggest
changes are
related to the (now disappeared) North American and Fenno - Scandanavian
ice sheets, the regression might well be much less for situations where only Greenland and West Antarctica are «in play».